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• Configuring Oracle HTTP Server 12c for WebLogic Server Domain

  - by Emin Askerov

  Oracle HTTP Server (OHS) 12c 12.1.2 which was released in July 2013 as a part of Oracle Web Tier 12c is the web server component of Oracle Fusion Middleware. In essence this is Apache HTTP Server 2.2.22 (with critical bug fixes from higher versions) which includes modules developed specifically by Oracle. It provides a listener functionality for Oracle WebLogic Server and the framework for hosting static pages, dynamic pages, and applications over the Web. OHS can be easily managed by Weblogic Management Framework, a set of tools which provides administrative capabilities (start, stop, lifecycle operations, etc.) for Oracle Fusion Middleware products. In other words all tools which are familiar to us (Node Manager, WLST, Administration Console, Fusion Middleware Control etc.) presented as a part of Weblogic Management Framework and using for managing Java and System Components both for Weblogic Server and Standalone Domain types. You can familiarize yourself with these terms using related documentation: 1. Introduction to Oracle HTTP Server: http://docs.oracle.com/middleware/1212/webtier/index.html 2. Weblogic Management Framework: http://docs.oracle.com/middleware/1212/core/ASCON/terminology.htm#ASCON11260 In the given post I would like to cover rather simple use case how to configure OHS as web proxy in Weblogic Cluster environment. For example, we have existing Weblogic Domain where some managed servers have been joined to cluster and host business applications. We need to configure web proxy component which will act as entry point, load balancer for our cluster for user requests. Of course, we could install old good Apache HTTP Server and configure mod_wl plugin. However this solution not optimal from manageability perspective: we need to install Apache, install additional plugin then configure it by editing configuration file which is not really convenient for FMW Administrators and often increase time of performing of simple administrative task. Alternatively, we could use OHS as System Component within Weblogic Domain and use full power of Weblogic Management Framework in order to configure, manage and monitor it! I like this idea! What about you? I hope after reading this post you will agree with me. First of all it is necessary to download OHS binaries. You can use this link for downloading: http://www.oracle.com/technetwork/java/webtier/downloads/index2-303202.html As we will use Fusion Middleware Control for managing OHS instances it is necessary to extend your domain with Enterprise Manager and Oracle ADF and JRF templates. This is not topic for focusing in this post, but you could get more information from documentation or one of my previous posts: http://docs.oracle.com/middleware/1212/wls/WLDTR/fmw_templates.htm#sthref64 https://blogs.oracle.com/imc/entry/the_specifics_of_adf_12c Note: you should have properly configured Node Manager utility for managing OHS instances Let’s consider configuration process step by step: 1. Shut down all Weblogic instances of existing domain including Admin Server; 2. Install Oracle HTTP Server. You should use your Fusion Middleware Home Path (e.g. /u01/Oracle/FMW12) for Installation Location and select Colocated HTTP Server option as Installation Type. I will not focus on this topic in this post. All information related to OHS installation you could find here: http://docs.oracle.com/middleware/1212/webtier/WTINS/install_gui.htm#i1082009 3. Next we need to extend our existing domain with OHS component. In order to do this you should do the following: a. Run Fusion Middleware Configuration Wizard (ORACLE_HOME/oracle_common/common/bin/config.sh); b. On the step 1 select Update an existing domain option and point your Fusion Middleware Home Path; c. On the step 2 check Oracle HTTP Server, Oracle Enterprise Manager Plugin for WEBTIER templates; d. Go through other steps without any changes and finish configuration process. 4. Start Admin Server and all managed servers related to your cluster 5. Log in to Enterprise Manager FMW Control using http://<hostname>:<port>/em URL 6. Now we will create OHS instance within our Weblogic Domain Infrastructure. Navigate to Weblogic Domain -> Administration -> Create/Delete OHS menu item; 7. Enter to edit mode, clicking Changes -> Lock&Edit menu item; 8. Create new OHS instance clicking Create button; 9. Define Instance Name (e.g. DevOSH) and Machine parameters; 10. Now we need to define listen port. By default OHS will use 7777 port number for income HTTP requests. We could change it to any free port number we would like to use. In order to do it, right click on our created OHS instance (left hand panel) and navigate to Administration -> Port Configuration; 11. Click on record with port number 7777 and then click Edit button; 12. Change port number value (in our case this will be 8080) and then click OK button; 13. Now we need to edit mod_wl_ohs configuration in order to enable OHS to act as proxy for WebLogic Server Instances/Cluster; 14. In order to do it right click on our created OHS instance (left panel) and navigate to Administration -> mod_wl_ohs Configuration; a. In Weblogic Cluster you should enter cluster address (define <host:port> for all managed servers which participated in cluster), e.g: 192.168.56.2:7004,192.168.56.2:7005 b. Define Weblogic Port parameter at which the Oracle WebLogic Server host is listening for connection requests from the module (or from other servers); c. Check Dynamic Server List option. This will dynamically update cluster list for every request; d. In the Location table define list of endpoint locations which you would like to process. In order to do this click Add Row button and define Location, Weblogic Cluster, Path Trim and Path Prefix parameters (if required); e. Click Apply button in order to save changes. 15. Activate changes clicking Changes ? Activate Changes menu item; 16. Finally we will start configured OHS instance. Right click on OHS instance tree item under Web Tier folder, select Control -> Start Up menu item; 17. Ensure that OHS instance up and running and then test your environment. Run deployed application to your Weblogic Cluster accessing via OHS web proxy; Normal 0 false false false RU X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-fareast-language:EN-US;}

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• Benchmarking MySQL Replication with Multi-Threaded Slaves

  - by Mat Keep

  0 0 1 1145 6530 Homework 54 15 7660 14.0 Normal 0 false false false EN-US JA X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:Cambria; mso-ascii-font-family:Cambria; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Cambria; mso-hansi-theme-font:minor-latin; mso-ansi-language:EN-US;} The objective of this benchmark is to measure the performance improvement achieved when enabling the Multi-Threaded Slave enhancement delivered as a part MySQL 5.6. As the results demonstrate, Multi-Threaded Slaves delivers 5x higher replication performance based on a configuration with 10 databases/schemas. For real-world deployments, higher replication performance directly translates to: · Improved consistency of reads from slaves (i.e. reduced risk of reading "stale" data) · Reduced risk of data loss should the master fail before replicating all events in its binary log (binlog) The multi-threaded slave splits processing between worker threads based on schema, allowing updates to be applied in parallel, rather than sequentially. This delivers benefits to those workloads that isolate application data using databases - e.g. multi-tenant systems deployed in cloud environments. Multi-Threaded Slaves are just one of many enhancements to replication previewed as part of the MySQL 5.6 Development Release, which include: · Global Transaction Identifiers coupled with MySQL utilities for automatic failover / switchover and slave promotion · Crash Safe Slaves and Binlog · Optimized Row Based Replication · Replication Event Checksums · Time Delayed Replication These and many more are discussed in the “MySQL 5.6 Replication: Enabling the Next Generation of Web & Cloud Services” Developer Zone article  Back to the benchmark - details are as follows. Environment The test environment consisted of two Linux servers: · one running the replication master · one running the replication slave. Only the slave was involved in the actual measurements, and was based on the following configuration: - Hardware: Oracle Sun Fire X4170 M2 Server - CPU: 2 sockets, 6 cores with hyper-threading, 2930 MHz. - OS: 64-bit Oracle Enterprise Linux 6.1 - Memory: 48 GB Test Procedure Initial Setup: Two MySQL servers were started on two different hosts, configured as replication master and slave. 10 sysbench schemas were created, each with a single table: CREATE TABLE `sbtest` (    `id` int(10) unsigned NOT NULL AUTO_INCREMENT,    `k` int(10) unsigned NOT NULL DEFAULT '0',    `c` char(120) NOT NULL DEFAULT '',    `pad` char(60) NOT NULL DEFAULT '',    PRIMARY KEY (`id`),    KEY `k` (`k`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 10,000 rows were inserted in each of the 10 tables, for a total of 100,000 rows. When the inserts had replicated to the slave, the slave threads were stopped. The slave data directory was copied to a backup location and the slave threads position in the master binlog noted. 10 sysbench clients, each configured with 10 threads, were spawned at the same time to generate a random schema load against each of the 10 schemas on the master. Each sysbench client executed 10,000 "update key" statements: UPDATE sbtest set k=k+1 WHERE id = <random row> In total, this generated 100,000 update statements to later replicate during the test itself. Test Methodology: The number of slave workers to test with was configured using: SET GLOBAL slave_parallel_workers=<workers> Then the slave IO thread was started and the test waited for all the update queries to be copied over to the relay log on the slave. The benchmark clock was started and then the slave SQL thread was started. The test waited for the slave SQL thread to finish executing the 100k update queries, doing "select master_pos_wait()". When master_pos_wait() returned, the benchmark clock was stopped and the duration calculated. The calculated duration from the benchmark clock should be close to the time it took for the SQL thread to execute the 100,000 update queries. The 100k queries divided by this duration gave the benchmark metric, reported as Queries Per Second (QPS). Test Reset: The test-reset cycle was implemented as follows: · the slave was stopped · the slave data directory replaced with the previous backup · the slave restarted with the slave threads replication pointer repositioned to the point before the update queries in the binlog. The test could then be repeated with identical set of queries but a different number of slave worker threads, enabling a fair comparison. The Test-Reset cycle was repeated 3 times for 0-24 number of workers and the QPS metric calculated and averaged for each worker count. MySQL Configuration The relevant configuration settings used for MySQL are as follows: binlog-format=STATEMENT relay-log-info-repository=TABLE master-info-repository=TABLE As described in the test procedure, the slave_parallel_workers setting was modified as part of the test logic. The consequence of changing this setting is: 0 worker threads:    - current (i.e. single threaded) sequential mode    - 1 x IO thread and 1 x SQL thread    - SQL thread both reads and executes the events 1 worker thread:    - sequential mode    - 1 x IO thread, 1 x Coordinator SQL thread and 1 x Worker thread    - coordinator reads the event and hands it to the worker who executes 2+ worker threads:    - parallel execution    - 1 x IO thread, 1 x Coordinator SQL thread and 2+ Worker threads    - coordinator reads events and hands them to the workers who execute them Results Figure 1 below shows that Multi-Threaded Slaves deliver ~5x higher replication performance when configured with 10 worker threads, with the load evenly distributed across our 10 x schemas. This result is compared to the current replication implementation which is based on a single SQL thread only (i.e. zero worker threads). Figure 1: 5x Higher Performance with Multi-Threaded Slaves The following figure shows more detailed results, with QPS sampled and reported as the worker threads are incremented. The raw numbers behind this graph are reported in the Appendix section of this post. Figure 2: Detailed Results As the results above show, the configuration does not scale noticably from 5 to 9 worker threads. When configured with 10 worker threads however, scalability increases significantly. The conclusion therefore is that it is desirable to configure the same number of worker threads as schemas. Other conclusions from the results: · Running with 1 worker compared to zero workers just introduces overhead without the benefit of parallel execution. · As expected, having more workers than schemas adds no visible benefit. Aside from what is shown in the results above, testing also demonstrated that the following settings had a very positive effect on slave performance: relay-log-info-repository=TABLE master-info-repository=TABLE For 5+ workers, it was up to 2.3 times as fast to run with TABLE compared to FILE. Conclusion As the results demonstrate, Multi-Threaded Slaves deliver significant performance increases to MySQL replication when handling multiple schemas. This, and the other replication enhancements introduced in MySQL 5.6 are fully available for you to download and evaluate now from the MySQL Developer site (select Development Release tab). You can learn more about MySQL 5.6 from the documentation  Please don’t hesitate to comment on this or other replication blogs with feedback and questions. Appendix – Detailed Results

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• Open GL stars are not rendering

  - by Darestium

  I doing Nehe's Open GL Lesson 9. I'm using SFML for windowing, the strange thing is no stars are rendering. #include <SFML/System.hpp> #include <SFML/Window.hpp> #include <SFML/Graphics.hpp> #include <iostream> void processEvents(sf::Window *app); void processInput(sf::Window *app); void renderGlScene(sf::Window *app); void init(); int loadResources(); const int NUM_OF_STARS = 50; float triRot = 0.0f; float quadRot = 0.0f; bool twinkle = false; bool tKey = false; float zoom = 15.0f; float tilt = 90.0f; float spin = 0.0f; unsigned int loop; unsigned int texture_handle[1]; typedef struct { int r, g, b; float distance; float angle; } stars; stars star[NUM_OF_STARS]; int main() { sf::Window app(sf::VideoMode(800, 600, 32), "Nehe Lesson 9"); app.UseVerticalSync(false); init(); if (loadResources() == -1) { return EXIT_FAILURE; } while (app.IsOpened()) { processEvents(&app); processInput(&app); renderGlScene(&app); app.Display(); } return EXIT_SUCCESS; } int loadResources() { sf::Image img_data; // Load Texture if (!img_data.LoadFromFile("data/images/star.bmp")) { std::cout << "Could not load data/images/star.bmp"; return -1; } // Generate 1 texture glGenTextures(1, &texture_handle[0]); // Linear filtering glBindTexture(GL_TEXTURE_2D, texture_handle[0]); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, img_data.GetWidth(), img_data.GetHeight(), 0, GL_RGBA, GL_UNSIGNED_BYTE, img_data.GetPixelsPtr()); return 0; } void processInput(sf::Window *app) { const sf::Input& input = app->GetInput(); if (input.IsKeyDown(sf::Key::T) && !tKey) { tKey = true; twinkle = !twinkle; } if (!input.IsKeyDown(sf::Key::T)) { tKey = false; } if (input.IsKeyDown(sf::Key::Up)) { tilt -= 0.05f; } if (input.IsKeyDown(sf::Key::Down)) { tilt += 0.05f; } if (input.IsKeyDown(sf::Key::PageUp)) { zoom -= 0.02f; } if (input.IsKeyDown(sf::Key::Up)) { zoom += 0.02f; } } void init() { glClearDepth(1.f); glClearColor(0.f, 0.f, 0.f, 0.f); // Enable texturing glEnable(GL_TEXTURE_2D); //glDepthMask(GL_TRUE); // Setup a perpective projection glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(45.f, 1.f, 1.f, 500.f); glShadeModel(GL_SMOOTH); glBlendFunc(GL_SRC_ALPHA, GL_ONE); glEnable(GL_BLEND); for (loop = 0; loop < NUM_OF_STARS; loop++) { star[loop].distance = (float)loop / NUM_OF_STARS * 5.0f; // Calculate distance from the centre // Give stars random rgb value star[loop].r = rand() % 256; star[loop].g = rand() % 256; star[loop].b = rand() % 256; } } void processEvents(sf::Window *app) { sf::Event event; while (app->GetEvent(event)) { if (event.Type == sf::Event::Closed) { app->Close(); } if (event.Type == sf::Event::KeyPressed && event.Key.Code == sf::Key::Escape) { app->Close(); } } } void renderGlScene(sf::Window *app) { app->SetActive(); // Clear color depth buffer glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Apply some transformations glMatrixMode(GL_MODELVIEW); glLoadIdentity(); // Select texture glBindTexture(GL_TEXTURE_2D, texture_handle[0]); for (loop = 0; loop < NUM_OF_STARS; loop++) { glLoadIdentity(); // Reset The View Before We Draw Each Star glTranslatef(0.0f, 0.0f, zoom); // Zoom Into The Screen (Using The Value In 'zoom') glRotatef(tilt, 1.0f, 0.0f, 0.0f); // Tilt The View (Using The Value In 'tilt') glRotatef(star[loop].angle, 0.0f, 1.0f, 0.0f); // Rotate To The Current Stars Angle glTranslatef(star[loop].distance, 0.0f, 0.0f); // Move Forward On The X Plane glRotatef(-star[loop].angle,0.0f,1.0f,0.0f); // Cancel The Current Stars Angle glRotatef(-tilt,1.0f,0.0f,0.0f); // Cancel The Screen Tilt if (twinkle) { glColor4ub(star[(NUM_OF_STARS - loop) - 1].r, star[(NUM_OF_STARS - loop)-1].g, star[(NUM_OF_STARS - loop) - 1].b, 255); glBegin(GL_QUADS); // Begin Drawing The Textured Quad glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 0.0f); glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 0.0f); glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 0.0f); glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 0.0f); glEnd(); // Done Drawing The Textured Quad } glRotatef(spin,0.0f,0.0f,1.0f); // Rotate The Star On The Z Axis // Assign A Color Using Bytes glColor4ub(star[loop].r, star[loop].g, star[loop].b, 255); glBegin(GL_QUADS); // Begin Drawing The Textured Quad glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,-1.0f, 0.0f); glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,-1.0f, 0.0f); glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 0.0f); glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 0.0f); glEnd(); // Done Drawing The Textured Quad spin += 0.01f; // Used To Spin The Stars star[loop].angle += (float)loop / NUM_OF_STARS; // Changes The Angle Of A Star star[loop].distance -= 0.01f; // Changes The Distance Of A Star if (star[loop].distance < 0.0f) { star[loop].distance += 5.0f; // Move The Star 5 Units From The Center star[loop].r = rand() % 256; // Give It A New Red Value star[loop].g = rand() % 256; // Give It A New Green Value star[loop].b = rand() % 256; // Give It A New Blue Value } } } I've looked over the code atleast 10 times now and I can't figure out the problem. Any help would be much appreciated.

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• How to Identify Which Hardware Component is Failing in Your Computer

  - by Chris Hoffman

  Concluding that your computer has a hardware problem is just the first step. If you’re dealing with a hardware issue and not a software issue, the next step is determining what hardware problem you’re actually dealing with. If you purchased a laptop or pre-built desktop PC and it’s still under warranty, you don’t need to care about this. Have the manufacturer fix the PC for you — figuring it out is their problem. If you’ve built your own PC or you want to fix a computer that’s out of warranty, this is something you’ll need to do on your own. Blue Screen 101: Search for the Error Message This may seem like obvious advice, but searching for information about a blue screen’s error message can help immensely. Most blue screens of death you’ll encounter on modern versions of Windows will likely be caused by hardware failures. The blue screen of death often displays information about the driver that crashed or the type of error it encountered. For example, let’s say you encounter a blue screen that identified “NV4_disp.dll” as the driver that caused the blue screen. A quick Google search will reveal that this is the driver for NVIDIA graphics cards, so you now have somewhere to start. It’s possible that your graphics card is failing if you encounter such an error message. Check Hard Drive SMART Status Hard drives have a built in S.M.A.R.T. (Self-Monitoring, Analysis, and Reporting Technology) feature. The idea is that the hard drive monitors itself and will notice if it starts to fail, providing you with some advance notice before the drive fails completely. This isn’t perfect, so your hard drive may fail even if SMART says everything is okay. If you see any sort of “SMART error” message, your hard drive is failing. You can use SMART analysis tools to view the SMART health status information your hard drives are reporting. Test Your RAM RAM failure can result in a variety of problems. If the computer writes data to RAM and the RAM returns different data because it’s malfunctioning, you may see application crashes, blue screens, and file system corruption. To test your memory and see if it’s working properly, use Windows’ built-in Memory Diagnostic tool. The Memory Diagnostic tool will write data to every sector of your RAM and read it back afterwards, ensuring that all your RAM is working properly. Check Heat Levels How hot is is inside your computer? Overheating can rsult in blue screens, crashes, and abrupt shut downs. Your computer may be overheating because you’re in a very hot location, it’s ventilated poorly, a fan has stopped inside your computer, or it’s full of dust. Your computer monitors its own internal temperatures and you can access this information. It’s generally available in your computer’s BIOS, but you can also view it with system information utilities such as SpeedFan or Speccy. Check your computer’s recommended temperature level and ensure it’s within the appropriate range. If your computer is overheating, you may see problems only when you’re doing something demanding, such as playing a game that stresses your CPU and graphics card. Be sure to keep an eye on how hot your computer gets when it performs these demanding tasks, not only when it’s idle. Stress Test Your CPU You can use a utility like Prime95 to stress test your CPU. Such a utility will fore your computer’s CPU to perform calculations without allowing it to rest, working it hard and generating heat. If your CPU is becoming too hot, you’ll start to see errors or system crashes. Overclockers use Prime95 to stress test their overclock settings — if Prime95 experiences errors, they throttle back on their overclocks to ensure the CPU runs cooler and more stable. It’s a good way to check if your CPU is stable under load. Stress Test Your Graphics Card Your graphics card can also be stress tested. For example, if your graphics driver crashes while playing games, the games themselves crash, or you see odd graphical corruption, you can run a graphics benchmark utility like 3DMark. The benchmark will stress your graphics card and, if it’s overheating or failing under load, you’ll see graphical problems, crashes, or blue screens while running the benchmark. If the benchmark seems to work fine but you have issues playing a certain game, it may just be a problem with that game. Swap it Out Not every hardware problem is easy to diagnose. If you have a bad motherboard or power supply, their problems may only manifest through occasional odd issues with other components. It’s hard to tell if these components are causing problems unless you replace them completely. Ultimately, the best way to determine whether a component is faulty is to swap it out. For example, if you think your graphics card may be causing your computer to blue screen, pull the graphics card out of your computer and swap in a new graphics card. If everything is working well, it’s likely that your previous graphics card was bad. This isn’t easy for people who don’t have boxes of components sitting around, but it’s the ideal way to troubleshoot. Troubleshooting is all about trial and error, and swapping components out allows you to pin down which component is actually causing the problem through a process of elimination. This isn’t a complete guide to everything that could likely go wrong and how to identify it — someone could write a full textbook on identifying failing components and still not cover everything. But the tips above should give you some places to start dealing with the more common problems. Image Credit: Justin Marty on Flickr     

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• Checking who is connected to your server, with PowerShell.

  - by Fatherjack

  There are many occasions when, as a DBA, you want to see who is connected to your SQL Server, along with how they are connecting and what sort of activities they are carrying out. I’m going to look at a couple of ways of getting this information and compare the effort required and the results achieved of each. SQL Server comes with a couple of stored procedures to help with this sort of task – sp_who and its undocumented counterpart sp_who2. There is also the pumped up version of these called sp_whoisactive, written by Adam Machanic which does way more than these procedures. I wholly recommend you try it out if you don’t already know how it works. When it comes to serious interrogation of your SQL Server activity then it is absolutely indispensable. Anyway, back to the point of this blog, we are going to look at getting the information from sp_who2 for a remote server. I wrote this Powershell script a week or so ago and was quietly happy with it for a while. I’m relatively new to Powershell so forgive both my rather low threshold for entertainment and the fact that something so simple is a moderate achievement for me. $Server = 'SERVERNAME' $SMOServer = New-Object Microsoft.SQLServer.Management.SMO.Server $Server # connection and query stuff         $ConnectionStr = "Server=$Server;Database=Master;Integrated Security=True" $Query = "EXEC sp_who2" $Connection = new-object system.Data.SQLClient.SQLConnection $Table = new-object "System.Data.DataTable" $Connection.connectionstring = $ConnectionStr try{ $Connection.open() $Command = $Connection.CreateCommand() $Command.commandtext = $Query $result = $Command.ExecuteReader() $Table.Load($result) } catch{ # Show error $error[0] | format-list -Force } $Title = "Data access processes (" + $Table.Rows.Count + ")" $Table | Out-GridView -Title $Title $Connection.close() So this is pretty straightforward, create an SMO object that represents our chosen server, define a connection to the database and a table object for the results when we get them, execute our query over the connection, load the results into our table object and then, if everything is error free display these results to the PowerShell grid viewer. The query simply gets the results of ‘EXEC sp_who2′ for us. Depending on how many connections there are will influence how long the query runs. The grid viewer lets me sort and search the results so it can be a pretty handy way to locate troublesome connections. Like I say, I was quite pleased with this, it seems a pretty simple script and was working well for me, I have added a few parameters to control the output and give me more specific details but then I see a script that uses the $SMOServer object itself to provide the process information and saves having to define the connection object and query specifications. $Server = 'SERVERNAME' $SMOServer = New-Object Microsoft.SQLServer.Management.SMO.Server $Server $Processes = $SMOServer.EnumProcesses() $Title = "SMO processes (" + $Processes.Rows.Count + ")" $Processes | Out-GridView -Title $Title Create the SMO object of our server and then call the EnumProcesses method to get all the process information from the server. Staggeringly simple! The results are a little different though. Some columns are the same and we can see the same basic information so my first thought was to which runs faster – so that I can get my results more quickly and also so that I place less stress on my server(s). PowerShell comes with a great way of testing this – the Measure-Command function. All you have to do is wrap your piece of code in Measure-Command {[your code here]} and it will spit out the time taken to execute the code. So, I placed both of the above methods of getting SQL Server process connections in two Measure-Command wrappers and pressed F5! The Powershell console goes blank for a while as the code is executed internally when Measure-Command is used but the grid viewer windows appear and the console shows this. You can take the output from Measure-Command and format it for easier reading but in a simple comparison like this we can simply cross refer the TotalMilliseconds values from the two result sets to see how the two methods performed. The query execution method (running EXEC sp_who2 ) is the first set of timings and the SMO EnumProcesses is the second. I have run these on a variety of servers and while the results vary from execution to execution I have never seen the SMO version slower than the other. The difference has varied and the time for both has ranged from sub-second as we see above to almost 5 seconds on other systems. This difference, I would suggest is partly due to the cost overhead of having to construct the data connection and so on where as the SMO EnumProcesses method has the connection to the server already in place and just needs to call back the process information. There is also the difference in the data sets to consider. Let’s take a look at what we get and where the two methods differ Query execution method (sp_who2) SMO EnumProcesses Description - Urn What looks like an XML or JSON representation of the server name and the process ID SPID Spid The process ID Status Status The status of the process Login Login The login name of the user executing the command HostName Host The name of the computer where the  process originated BlkBy BlockingSpid The SPID of a process that is blocking this one DBName Database The database that this process is connected to Command Command The type of command that is executing CPUTime Cpu The CPU activity related to this process DiskIO - The Disk IO activity related to this process LastBatch - The time the last batch was executed from this process. ProgramName Program The application that is facilitating the process connection to the SQL Server. SPID1 - In my experience this is always the same value as SPID. REQUESTID - In my experience this is always 0 - Name In my experience this is always the same value as SPID and so could be seen as analogous to SPID1 from sp_who2 - MemUsage An indication of the memory used by this process but I don’t know what it is measured in (bytes, Kb, Mb…) - IsSystem True or False depending on whether the process is internal to the SQL Server instance or has been created by an external connection requesting data. - ExecutionContextID In my experience this is always 0 so could be analogous to REQUESTID from sp_who2. Please note, these are my own very brief descriptions of these columns, detail can be found from MSDN for columns in the sp_who results here http://msdn.microsoft.com/en-GB/library/ms174313.aspx. Where the columns are common then I would use that description, in other cases then the information returned is purely for interpretation by the reader. Rather annoyingly both result sets have useful information that the other doesn’t. sp_who2 returns Disk IO and LastBatch information which is really useful but the SMO processes method give you IsSystem and MemUsage which have their place in fault diagnosis methods too. So which is better? On reflection I think I prefer to use the sp_who2 method primarily but knowing that the SMO Enumprocesses method is there when I need it is really useful and I’m sure I’ll use it regularly. I’m OK with the fact that it is the slower method because Measure-Command has shown me how close it is to the other option and that it really isn’t a large enough margin to matter.

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• ApiChange Is Released!

  - by Alois Kraus

  I have been working on little tool to simplify my life and perhaps yours as developer as well. It is basically a command line tool that allows you to execute queries on your compiled .NET code base. The main purpose is to find out how big the impact of an api change would be if you changed this or that.  Now you can do high level operations like Diff public types for breaking changes. Who uses a method? Who uses a type? Who uses implements an interface? Who references me? What format has the binary  (32/64, Managed C++, Pure IL, Unmanaged)? Search for all event subscribers and unsubscribers. A unique feature is to check for event subscription imbalances. Forgotten event subscriptions are the 90% cause of managed memory leaks. It is done at a per class level. If one class does subscribe to one event more often than it does unsubscribe it is treated as possible event subscription imbalance. Another unique ability is to search for users of string literals which allows you to track users of a string constant which is not possible otherwise. For incremental builds the ShowRebuildTargets command can be used to identify the dependant targets that need a rebuild after you did compile one assembly. It has some heuristics in place to determine the impact of breaking changes and finds out which targets need to be recompiled as well. It has a ton of other features and a an API to access these things programmatically so you can build upon these simple queries create even better tools. Perhaps we get a Visual Studio plug in? You can download it from CodePlex here. It works via XCopy deployment. Simply let it run and check the command line help out. The best feature in my opinion is that the output of nearly all commands can be piped to Excel for further analysis. Since it does read also the pdbs it can show you the source file name and line number as well for all matches. The following picture shows the output of a –WhousesType query. The following command checks where type from BaseLibraryV1.dll are used inside DependantLibV1.dll. All matches are printed out with the reason and matching item along with file and line number. There is even a hyper link to the match which will open Visual Studio. ApiChange -whousestype "*" BaseLibraryV1.dll -in DependantLibV1.dll –excel The "*” is the actual query which means all types. The syntax is the same like in C# just that placeholders are allowed ;-). More info's can be found at the Codeplex Documentation.     The tool was developed in a TDD style manner which means that it is heavily tested and already used by a quite large user base inside the company I do work for. Luckily for you I got the permission to make it public so you take advantage of it. It is fully instrumented with tracing. If you find bugs simply add the –trace command line switch to find out what is failing and send me the output. How is it done? Your first guess might be that it uses reflection. Wrong. It is based on Mono Cecil a free IL parser with a fantastic API to access all internals of a managed assembly. The speed is awesome and to make it even faster I did make the tool heavily multi threaded. The query above did execute in 1.8s with the Excel output. On a rather slow machine I can analyze over 1500 assemblies in less than 40s with a very low memory consumption. The true power of Mono Cecil is that I can load an assembly like any other data file. I have no problems unloading a file but if I would have used reflection I would need to unload a whole AppDomain just to get rid of one assembly in my memory. Just to give you a glimpse how ApiChange.Api.dll can be used I show you one of the unit tests:           public void Can_Find_GenericMethodInvocations_With_Type_Parameters()         { // 1. Create an aggregator to collect our matches             UsageQueryAggregator agg = new UsageQueryAggregator();   // 2. This is the type we want to search for. Load it via the type query             var decimalType = TypeQuery.GetTypeByName(TestConstants.MscorlibAssembly, "System.Decimal");   // 3. register the type query which searches for uses of the Decimal type             new WhoUsesType(agg, decimalType);   // 4. Search for all users of the Decimal type in the DependandLibV1Assembly             agg.Analyze(TestConstants.DependandLibV1Assembly);   // Extract matches and assert             Assert.AreEqual(2, agg.MethodMatches.Count, "Method match count");             Assert.AreEqual("UseGenericMethod", agg.MethodMatches[0].Match.Name);             Assert.AreEqual("UseGenericMethod", agg.MethodMatches[1].Match.Name);         } Many thanks go from here to Jb Evian for the creation of Mono.Cecil. Without this fantastic piece of code it would have been much much harder. There are other options around like the Common Compiler Infrastructure  Metadata Api which should do the same thing but it was not a real option since the Microsoft reader did fail on even simple assemblies (at least in September 2009 this was the case). Besides this I found the CCI Apis much harder to use. The only real competitor was Reflector which does support many things but does not let me access his cool high level analyze commands. So I decided to dig into the IL specs and as a result you can query your compiled binaries from the command line or programmatically. The best thing is you try it out for yourself and give me some feedback what you miss. If you want to contribute or have a cool idea what should be added drop me a mail at A Kraus1@___No [email protected]. There is much more inside the tool I did not talk about it (yet).

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• SDL_BlitSurface segmentation fault (surfaces aren't null)

  - by Trollkemada

  My app is crashing on SDL_BlitSurface() and i can't figure out why. I think it has something to do with my static object. If you read the code you'll why I think so. This happens when the limits of the map are reached, i.e. (iwidth || jheight). This is the code: Map.cpp (this render) Tile const * Map::getTyle(int i, int j) const { if (i >= 0 && j >= 0 && i < width && j < height) { return data[i][j]; } else { return &Tile::ERROR_TYLE; // This makes SDL_BlitSurface (called later) crash //return new Tile(TileType::ERROR); // This works with not problem (but is memory leak, of course) } } void Map::render(int x, int y, int width, int height) const { //DEBUG("(Rendering...) x: "<<x<<", y: "<<y<<", width: "<<width<<", height: "<<height); int firstI = x / TileType::PIXEL_PER_TILE; int firstJ = y / TileType::PIXEL_PER_TILE; int lastI = (x+width) / TileType::PIXEL_PER_TILE; int lastJ = (y+height) / TileType::PIXEL_PER_TILE; // The previous integer division rounds down when dealing with positive values, but it rounds up // negative values. This is a fix for that (We need those values always rounded down) if (firstI < 0) { firstI--; } if (firstJ < 0) { firstJ--; } const int firstX = x; const int firstY = y; SDL_Rect srcRect; SDL_Rect dstRect; for (int i=firstI; i <= lastI; i++) { for (int j=firstJ; j <= lastJ; j++) { if (i*TileType::PIXEL_PER_TILE < x) { srcRect.x = x % TileType::PIXEL_PER_TILE; srcRect.w = TileType::PIXEL_PER_TILE - (x % TileType::PIXEL_PER_TILE); dstRect.x = i*TileType::PIXEL_PER_TILE + (x % TileType::PIXEL_PER_TILE) - firstX; } else if (i*TileType::PIXEL_PER_TILE >= x + width) { srcRect.x = 0; srcRect.w = x % TileType::PIXEL_PER_TILE; dstRect.x = i*TileType::PIXEL_PER_TILE - firstX; } else { srcRect.x = 0; srcRect.w = TileType::PIXEL_PER_TILE; dstRect.x = i*TileType::PIXEL_PER_TILE - firstX; } if (j*TileType::PIXEL_PER_TILE < y) { srcRect.y = 0; srcRect.h = TileType::PIXEL_PER_TILE - (y % TileType::PIXEL_PER_TILE); dstRect.y = j*TileType::PIXEL_PER_TILE + (y % TileType::PIXEL_PER_TILE) - firstY; } else if (j*TileType::PIXEL_PER_TILE >= y + height) { srcRect.y = y % TileType::PIXEL_PER_TILE; srcRect.h = y % TileType::PIXEL_PER_TILE; dstRect.y = j*TileType::PIXEL_PER_TILE - firstY; } else { srcRect.y = 0; srcRect.h = TileType::PIXEL_PER_TILE; dstRect.y = j*TileType::PIXEL_PER_TILE - firstY; } SDL::YtoSDL(dstRect.y, srcRect.h); SDL_BlitSurface(getTyle(i,j)->getType()->getSurface(), &srcRect, SDL::getScreen(), &dstRect); // <-- Crash HERE /*DEBUG("i = "<<i<<", j = "<<j); DEBUG("srcRect.x = "<<srcRect.x<<", srcRect.y = "<<srcRect.y<<", srcRect.w = "<<srcRect.w<<", srcRect.h = "<<srcRect.h); DEBUG("dstRect.x = "<<dstRect.x<<", dstRect.y = "<<dstRect.y);*/ } } } Tile.h #ifndef TILE_H #define TILE_H #include "TileType.h" class Tile { private: TileType const * type; public: static const Tile ERROR_TYLE; Tile(TileType const * t); ~Tile(); TileType const * getType() const; }; #endif Tile.cpp #include "Tile.h" const Tile Tile::ERROR_TYLE(TileType::ERROR); Tile::Tile(TileType const * t) : type(t) {} Tile::~Tile() {} TileType const * Tile::getType() const { return type; } TileType.h #ifndef TILETYPE_H #define TILETYPE_H #include "SDL.h" #include "DEBUG.h" class TileType { protected: TileType(); ~TileType(); public: static const int PIXEL_PER_TILE = 30; static const TileType * ERROR; static const TileType * AIR; static const TileType * SOLID; virtual SDL_Surface * getSurface() const = 0; virtual bool isSolid(int x, int y) const = 0; }; #endif ErrorTyle.h #ifndef ERRORTILE_H #define ERRORTILE_H #include "TileType.h" class ErrorTile : public TileType { friend class TileType; private: ErrorTile(); mutable SDL_Surface * surface; static const char * FILE_PATH; public: SDL_Surface * getSurface() const; bool isSolid(int x, int y) const ; }; #endif ErrorTyle.cpp (The surface can't be loaded when building the object, because it is a static object and SDL_Init() needs to be called first) #include "ErrorTile.h" const char * ErrorTile::FILE_PATH = ("C:\\error.bmp"); ErrorTile::ErrorTile() : TileType(), surface(NULL) {} SDL_Surface * ErrorTile::getSurface() const { if (surface == NULL) { if (SDL::isOn()) { surface = SDL::loadAndOptimice(ErrorTile::FILE_PATH); if (surface->w != TileType::PIXEL_PER_TILE || surface->h != TileType::PIXEL_PER_TILE) { WARNING("Bad tile surface size"); } } else { ERROR("Trying to load a surface, but SDL is not on"); } } if (surface == NULL) { // This if doesn't get called, so surface != NULL ERROR("WTF? Can't load surface :\\"); } return surface; } bool ErrorTile::isSolid(int x, int y) const { return true; }

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• Online ALTER TABLE in MySQL 5.6

  - by Marko Mäkelä

  This is the low-level view of data dictionary language (DDL) operations in the InnoDB storage engine in MySQL 5.6. John Russell gave a more high-level view in his blog post April 2012 Labs Release – Online DDL Improvements. MySQL before the InnoDB Plugin Traditionally, the MySQL storage engine interface has taken a minimalistic approach to data definition language. The only natively supported operations were CREATE TABLE, DROP TABLE and RENAME TABLE. Consider the following example: CREATE TABLE t(a INT); INSERT INTO t VALUES (1),(2),(3); CREATE INDEX a ON t(a); DROP TABLE t; The CREATE INDEX statement would be executed roughly as follows: CREATE TABLE temp(a INT, INDEX(a)); INSERT INTO temp SELECT * FROM t; RENAME TABLE t TO temp2; RENAME TABLE temp TO t; DROP TABLE temp2; You could imagine that the database could crash when copying all rows from the original table to the new one. For example, it could run out of file space. Then, on restart, InnoDB would roll back the huge INSERT transaction. To fix things a little, a hack was added to ha_innobase::write_row for committing the transaction every 10,000 rows. Still, it was frustrating that even a simple DROP INDEX would make the table unavailable for modifications for a long time. Fast Index Creation in the InnoDB Plugin of MySQL 5.1 MySQL 5.1 introduced a new interface for CREATE INDEX and DROP INDEX. The old table-copying approach can still be forced by SET old_alter_table=0. This interface is used in MySQL 5.5 and in the InnoDB Plugin for MySQL 5.1. Apart from the ability to do a quick DROP INDEX, the main advantage is that InnoDB will execute a merge-sort algorithm before inserting the index records into each index that is being created. This should speed up the insert into the secondary index B-trees and potentially result in a better B-tree fill factor. The 5.1 ALTER TABLE interface was not perfect. For example, DROP FOREIGN KEY still invoked the table copy. Renaming columns could conflict with InnoDB foreign key constraints. Combining ADD KEY and DROP KEY in ALTER TABLE was problematic and not atomic inside the storage engine. The ALTER TABLE interface in MySQL 5.6 The ALTER TABLE storage engine interface was completely rewritten in MySQL 5.6. Instead of introducing a method call for every conceivable operation, MySQL 5.6 introduced a handful of methods, and data structures that keep track of the requested changes. In MySQL 5.6, online ALTER TABLE operation can be requested by specifying LOCK=NONE. Also LOCK=SHARED and LOCK=EXCLUSIVE are available. The old-style table copying can be requested by ALGORITHM=COPY. That one will require at least LOCK=SHARED. From the InnoDB point of view, anything that is possible with LOCK=EXCLUSIVE is also possible with LOCK=SHARED. Most ALGORITHM=INPLACE operations inside InnoDB can be executed online (LOCK=NONE). InnoDB will always require an exclusive table lock in two phases of the operation. The execution phases are tied to a number of methods: handler::check_if_supported_inplace_alter Checks if the storage engine can perform all requested operations, and if so, what kind of locking is needed. handler::prepare_inplace_alter_table InnoDB uses this method to set up the data dictionary cache for upcoming CREATE INDEX operation. We need stubs for the new indexes, so that we can keep track of changes to the table during online index creation. Also, crash recovery would drop any indexes that were incomplete at the time of the crash. handler::inplace_alter_table In InnoDB, this method is used for creating secondary indexes or for rebuilding the table. This is the ‘main’ phase that can be executed online (with concurrent writes to the table). handler::commit_inplace_alter_table This is where the operation is committed or rolled back. Here, InnoDB would drop any indexes, rename any columns, drop or add foreign keys, and finalize a table rebuild or index creation. It would also discard any logs that were set up for online index creation or table rebuild. The prepare and commit phases require an exclusive lock, blocking all access to the table. If MySQL times out while upgrading the table meta-data lock for the commit phase, it will roll back the ALTER TABLE operation. In MySQL 5.6, data definition language operations are still not fully atomic, because the data dictionary is split. Part of it is inside InnoDB data dictionary tables. Part of the information is only available in the *.frm file, which is not covered by any crash recovery log. But, there is a single commit phase inside the storage engine. Online Secondary Index Creation It may occur that an index needs to be created on a new column to speed up queries. But, it may be unacceptable to block modifications on the table while creating the index. It turns out that it is conceptually not so hard to support online index creation. All we need is some more execution phases: Set up a stub for the index, for logging changes. Scan the table for index records. Sort the index records. Bulk load the index records. Apply the logged changes. Replace the stub with the actual index. Threads that modify the table will log the operations to the logs of each index that is being created. Errors, such as log overflow or uniqueness violations, will only be flagged by the ALTER TABLE thread. The log is conceptually similar to the InnoDB change buffer. The bulk load of index records will bypass record locking. We still generate redo log for writing the index pages. It would suffice to log page allocations only, and to flush the index pages from the buffer pool to the file system upon completion. Native ALTER TABLE Starting with MySQL 5.6, InnoDB supports most ALTER TABLE operations natively. The notable exceptions are changes to the column type, ADD FOREIGN KEY except when foreign_key_checks=0, and changes to tables that contain FULLTEXT indexes. The keyword ALGORITHM=INPLACE is somewhat misleading, because certain operations cannot be performed in-place. For example, changing the ROW_FORMAT of a table requires a rebuild. Online operation (LOCK=NONE) is not allowed in the following cases: when adding an AUTO_INCREMENT column, when the table contains FULLTEXT indexes or a hidden FTS_DOC_ID column, or when there are FOREIGN KEY constraints referring to the table, with ON…CASCADE or ON…SET NULL option. The FOREIGN KEY limitations are needed, because MySQL does not acquire meta-data locks on the child or parent tables when executing SQL statements. Theoretically, InnoDB could support operations like ADD COLUMN and DROP COLUMN in-place, by lazily converting the table to a newer format. This would require that the data dictionary keep multiple versions of the table definition. For simplicity, we will copy the entire table, even for DROP COLUMN. The bulk copying of the table will bypass record locking and undo logging. For facilitating online operation, a temporary log will be associated with the clustered index of table. Threads that modify the table will also write the changes to the log. When altering the table, we skip all records that have been marked for deletion. In this way, we can simply discard any undo log records that were not yet purged from the original table. Off-page columns, or BLOBs, are an important consideration. We suspend the purge of delete-marked records if it would free any off-page columns from the old table. This is because the BLOBs can be needed when applying changes from the log. We have special logging for handling the ROLLBACK of an INSERT that inserted new off-page columns. This is because the columns will be freed at rollback.

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• collision detection problems - Javascript/canvas game

  - by Tom Burman

  Ok here is a more detailed version of my question. What i want to do: i simply want the have a 2d array to represent my game map. i want a player sprite and i want that sprite to be able to move around my map freely using the keyboard and also have collisions with certain tiles of my map array. i want to use very large maps so i need a viewport. What i have: I have a loop to load the tile images into an array: /Loop to load tile images into an array var mapTiles = []; for (x = 0; x <= 256; x++) { var imageObj = new Image(); // new instance for each image imageObj.src = "images/prototype/"+x+".jpg"; mapTiles.push(imageObj); } I have a 2d array for my game map: //Array to hold map data var board = [ [1,2,3,4,3,4,3,4,5,6,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1], [17,18,19,20,19,20,19,20,21,22,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1], [33,34,35,36,35,36,35,36,37,38,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1], [49,50,51,52,51,52,51,52,53,54,1,1,1,1,1,1,1,1,1,1,1,1,1,197,198,199,1,1,1,1], [65,66,67,68,146,147,67,68,69,70,1,1,1,1,1,1,1,1,216,217,1,1,1,213,214,215,1,1,1,1], [81,82,83,161,162,163,164,84,85,86,1,1,1,1,1,1,1,1,232,233,1,1,1,229,230,231,1,1,1,1], [97,98,99,177,178,179,180,100,101,102,1,1,1,1,59,1,1,1,248,249,1,1,1,245,246,247,1,1,1,1], [1,1,238,1,1,1,1,239,240,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1], [216,217,254,1,1,1,1,255,256,1,204,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1], [232,233,1,1,1,117,118,1,1,1,220,1,1,119,120,1,1,1,1,1,1,1,1,1,1,1,119,120,1,1], [248,249,1,1,1,133,134,1,1,1,1,1,1,135,136,1,1,1,1,1,1,59,1,1,1,1,135,136,1,1], [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1], [1,1,216,217,1,1,1,1,1,1,60,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1], [1,1,232,233,1,1,1,1,1,1,1,1,1,1,1,1,1,1,204,1,1,1,1,1,1,1,1,1,1,1], [1,1,248,249,1,1,1,1,1,1,1,1,1,1,1,1,1,1,220,1,1,1,1,1,1,216,217,1,1,1], [1,1,1,1,1,1,1,1,1,1,1,1,149,150,151,1,1,1,1,1,1,1,1,1,1,232,233,1,1,1], [12,12,12,12,12,12,12,13,1,1,1,1,165,166,167,1,1,1,1,1,1,119,120,1,1,248,249,1,1,1], [28,28,28,28,28,28,28,29,1,1,1,1,181,182,183,1,1,1,1,1,1,135,136,1,1,1,1,1,1,1], [44,44,44,44,44,15,28,29,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1], [1,1,1,1,1,27,28,29,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1], [1,1,1,1,1,27,28,29,1,1,1,1,1,1,1,1,1,59,1,1,197,198,199,1,1,1,1,119,120,1], [1,1,1,1,1,27,28,29,1,1,216,217,1,1,1,1,1,1,1,1,213,214,215,1,1,1,1,135,136,1], [1,1,1,1,1,27,28,29,1,1,232,233,1,1,1,1,1,1,1,1,229,230,231,1,1,1,1,1,1,1], [1,1,1,1,1,27,28,29,1,1,248,249,1,1,1,1,1,1,1,1,245,246,247,1,1,1,1,1,1,1], [1,1,1,197,198,199,28,29,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1], [1,1,1,213,214,215,28,29,1,1,1,1,1,60,1,1,1,1,204,1,1,1,1,1,1,1,1,1,1,1], [1,1,1,229,230,231,28,29,1,1,1,1,1,1,1,1,1,1,220,1,1,1,1,119,120,1,1,1,1,1], [1,1,1,245,246,247,28,29,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,135,136,1,1,60,1,1], [1,1,1,1,1,27,28,29,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1], [1,1,1,1,1,27,28,29,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1] ]; I have my loop to place the correct tile sin the correct positions: //Loop to place tiles onto screen in correct position for (x = 0; x <= viewWidth; x++){ for (y = 0; y <= viewHeight; y++){ var width = 32; var height = 32; context.drawImage(mapTiles[board[y+viewY][x+viewX]],x*width, y*height); } } I Have my player object : //Place player object context.drawImage(playerImg, (playerX-viewX)*32,(playerY-viewY)*32, 32, 32); I have my viewport setup: //Set viewport pos viewX = playerX - Math.floor(0.5 * viewWidth); if (viewX < 0) viewX = 0; if (viewX+viewWidth > worldWidth) viewX = worldWidth - viewWidth; viewY = playerY - Math.floor(0.5 * viewHeight); if (viewY < 0) viewY = 0; if (viewY+viewHeight > worldHeight) viewY = worldHeight - viewHeight; I have my player movement: canvas.addEventListener('keydown', function(e) { console.log(e); var key = null; switch (e.which) { case 37: // Left if (playerY > 0) playerY--; break; case 38: // Up if (playerX > 0) playerX--; break; case 39: // Right if (playerY < worldWidth) playerY++; break; case 40: // Down if (playerX < worldHeight) playerX++; break; } My Problem: I have my map loading an it looks fine, but my player position thinks it's on a different tile to what it actually is. So for instance, i know that if my player moves left 1 tile, the value of that tile should be 2, but if i print out the value it should be moving to (2), it comes up with a different value. How ive tried to solve the problem: I have tried swap X and Y values for the initialization of my player, for when my map prints. If i swap the x and y values in this part of my code: context.drawImage(mapTiles[board[y+viewY][x+viewX]],x*width, y*height); The map doesnt get draw correctly at all and tiles are placed all in random positions or orientations IF i sway the x and y values for my player in this line : context.drawImage(playerImg, (playerX-viewX)*32,(playerY-viewY)*32, 32, 32); The players movements are inversed, so up and down keys move my player left and right viceversa. My question: Where am i going wrong in my code, and how do i solve it so i have my map looking like it should and my player moving as it should as well as my player returning the correct tileID it is standing on or moving too. Thanks Again ALSO Here is a link to my whole code: prototype

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• Entity Framework 6: Alpha2 Now Available

  - by ScottGu

  The Entity Framework team recently announced the 2nd alpha release of EF6.   The alpha 2 package is available for download from NuGet. Since this is a pre-release package make sure to select “Include Prereleases” in the NuGet package manager, or execute the following from the package manager console to install it: PM> Install-Package EntityFramework -Pre This week’s alpha release includes a bunch of great improvements in the following areas: Async language support is now available for queries and updates when running on .NET 4.5. Custom conventions now provide the ability to override the default conventions that Code First uses for mapping types, properties, etc. to your database. Multi-tenant migrations allow the same database to be used by multiple contexts with full Code First Migrations support for independently evolving the model backing each context. Using Enumerable.Contains in a LINQ query is now handled much more efficiently by EF and the SQL Server provider resulting greatly improved performance. All features of EF6 (except async) are available on both .NET 4 and .NET 4.5. This includes support for enums and spatial types and the performance improvements that were previously only available when using .NET 4.5. Start-up time for many large models has been dramatically improved thanks to improved view generation performance. Below are some additional details about a few of the improvements above: Async Support .NET 4.5 introduced the Task-Based Asynchronous Pattern that uses the async and await keywords to help make writing asynchronous code easier. EF 6 now supports this pattern. This is great for ASP.NET applications as database calls made through EF can now be processed asynchronously – avoiding any blocking of worker threads. This can increase scalability on the server by allowing more requests to be processed while waiting for the database to respond. The following code shows an MVC controller that is querying a database for a list of location entities:     public class HomeController : Controller     {         LocationContext db = new LocationContext();           public async Task<ActionResult> Index()         {             var locations = await db.Locations.ToListAsync();               return View(locations);         }     } Notice above the call to the new ToListAsync method with the await keyword. When the web server reaches this code it initiates the database request, but rather than blocking while waiting for the results to come back, the thread that is processing the request returns to the thread pool, allowing ASP.NET to process another incoming request with the same thread. In other words, a thread is only consumed when there is actual processing work to do, allowing the web server to handle more concurrent requests with the same resources. A more detailed walkthrough covering async in EF is available with additional information and examples. Also a walkthrough is available showing how to use async in an ASP.NET MVC application. Custom Conventions When working with EF Code First, the default behavior is to map .NET classes to tables using a set of conventions baked into EF. For example, Code First will detect properties that end with “ID” and configure them automatically as primary keys. However, sometimes you cannot or do not want to follow those conventions and would rather provide your own. For example, maybe your primary key properties all end in “Key” instead of “Id”. Custom conventions allow the default conventions to be overridden or new conventions to be added so that Code First can map by convention using whatever rules make sense for your project. The following code demonstrates using custom conventions to set the precision of all decimals to 5. As with other Code First configuration, this code is placed in the OnModelCreating method which is overridden on your derived DbContext class:         protected override void OnModelCreating(DbModelBuilder modelBuilder)         {             modelBuilder.Properties<decimal>()                 .Configure(x => x.HasPrecision(5));           } But what if there are a couple of places where a decimal property should have a different precision? Just as with all the existing Code First conventions, this new convention can be overridden for a particular property simply by explicitly configuring that property using either the fluent API or a data annotation. A more detailed description of custom code first conventions is available here. Community Involvement I blogged a while ago about EF being released under an open source license.  Since then a number of community members have made contributions and these are included in EF6 alpha 2. Two examples of community contributions are: AlirezaHaghshenas contributed a change that increases the startup performance of EF for larger models by improving the performance of view generation. The change means that it is less often necessary to use of pre-generated views. UnaiZorrilla contributed the first community feature to EF: the ability to load all Code First configuration classes in an assembly with a single method call like the following: protected override void OnModelCreating(DbModelBuilder modelBuilder) {        modelBuilder.Configurations            .AddFromAssembly(typeof(LocationContext).Assembly); } This code will find and load all the classes that inherit from EntityTypeConfiguration<T> or ComplexTypeConfiguration<T> in the assembly where LocationContext is defined. This reduces the amount of coupling between the context and Code First configuration classes, and is also a very convenient shortcut for large models. Other upcoming features coming in EF 6 Lots of information about the development of EF6 can be found on the EF CodePlex site, including a roadmap showing the other features that are planned for EF6. One of of the nice upcoming features is connection resiliency, which will automate the process of retying database operations on transient failures common in cloud environments and with databases such as the Windows Azure SQL Database. Another often requested feature that will be included in EF6 is the ability to map stored procedures to query and update operations on entities when using Code First. Summary EF6 is the first open source release of Entity Framework being developed in CodePlex. The alpha 2 preview release of EF6 is now available on NuGet, and contains some really great features for you to try. The EF team are always looking for feedback from developers - especially on the new features such as custom Code First conventions and async support. To provide feedback you can post a comment on the EF6 alpha 2 announcement post, start a discussion or file a bug on the CodePlex site. Hope this helps, Scott P.S. In addition to blogging, I am also now using Twitter for quick updates and to share links. Follow me at: twitter.com/scottgu

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• JPA 2.1 Schema Generation (TOTD #187)

  - by arungupta

  This blog explained some of the key features of JPA 2.1 earlier. Since then Schema Generation has been added to JPA 2.1. This Tip Of The Day (TOTD) will provide more details about this new feature in JPA 2.1. Schema Generation refers to generation of database artifacts like tables, indexes, and constraints in a database schema. It may or may not involve generation of a proper database schema depending upon the credentials and authorization of the user. This helps in prototyping of your application where the required artifacts are generated either prior to application deployment or as part of EntityManagerFactory creation. This is also useful in environments that require provisioning database on demand, e.g. in a cloud. This feature will allow your JPA domain object model to be directly generated in a database. The generated schema may need to be tuned for actual production environment. This usecase is supported by allowing the schema generation to occur into DDL scripts which can then be further tuned by a DBA. The following set of properties in persistence.xml or specified during EntityManagerFactory creation controls the behaviour of schema generation. Property Name Purpose Values javax.persistence.schema-generation-action Controls action to be taken by persistence provider "none", "create", "drop-and-create", "drop" javax.persistence.schema-generation-target Controls whehter schema to be created in database, whether DDL scripts are to be created, or both "database", "scripts", "database-and-scripts" javax.persistence.ddl-create-script-target, javax.persistence.ddl-drop-script-target Controls target locations for writing of scripts. Writers are pre-configured for the persistence provider. Need to be specified only if scripts are to be generated. java.io.Writer (e.g. MyWriter.class) or URL strings javax.persistence.ddl-create-script-source, javax.persistence.ddl-drop-script-source Specifies locations from which DDL scripts are to be read. Readers are pre-configured for the persistence provider. java.io.Reader (e.g. MyReader.class) or URL strings javax.persistence.sql-load-script-source Specifies location of SQL bulk load script. java.io.Reader (e.g. MyReader.class) or URL string javax.persistence.schema-generation-connection JDBC connection to be used for schema generation javax.persistence.database-product-name, javax.persistence.database-major-version, javax.persistence.database-minor-version Needed if scripts are to be generated and no connection to target database. Values are those obtained from JDBC DatabaseMetaData. javax.persistence.create-database-schemas Whether Persistence Provider need to create schema in addition to creating database objects such as tables, sequences, constraints, etc. "true", "false" Section 11.2 in the JPA 2.1 specification defines the annotations used for schema generation process. For example, @Table, @Column, @CollectionTable, @JoinTable, @JoinColumn, are used to define the generated schema. Several layers of defaulting may be involved. For example, the table name is defaulted from entity name and entity name (which can be specified explicitly as well) is defaulted from the class name. However annotations may be used to override or customize the values. The following entity class: @Entity public class Employee {    @Id private int id;    private String name;     . . .     @ManyToOne     private Department dept; } is generated in the database with the following attributes: Maps to EMPLOYEE table in default schema "id" field is mapped to ID column as primary key "name" is mapped to NAME column with a default VARCHAR(255). The length of this field can be easily tuned using @Column. @ManyToOne is mapped to DEPT_ID foreign key column. Can be customized using JOIN_COLUMN. In addition to these properties, couple of new annotations are added to JPA 2.1: @Index - An index for the primary key is generated by default in a database. This new annotation will allow to define additional indexes, over a single or multiple columns, for a better performance. This is specified as part of @Table, @SecondaryTable, @CollectionTable, @JoinTable, and @TableGenerator. For example: @Table(indexes = {@Index(columnList="NAME"), @Index(columnList="DEPT_ID DESC")})@Entity public class Employee {    . . .} The generated table will have a default index on the primary key. In addition, two new indexes are defined on the NAME column (default ascending) and the foreign key that maps to the department in descending order. @ForeignKey - It is used to define foreign key constraint or to otherwise override or disable the persistence provider's default foreign key definition. Can be specified as part of JoinColumn(s), MapKeyJoinColumn(s), PrimaryKeyJoinColumn(s). For example: @Entity public class Employee {    @Id private int id;    private String name;    @ManyToOne    @JoinColumn(foreignKey=@ForeignKey(foreignKeyDefinition="FOREIGN KEY (MANAGER_ID) REFERENCES MANAGER"))    private Manager manager;     . . . } In this entity, the employee's manager is mapped by MANAGER_ID column in the MANAGER table. The value of foreignKeyDefinition would be a database specific string. A complete replay of Linda's talk at JavaOne 2012 can be seen here (click on CON4212_mp4_4212_001 in Media). These features will be available in GlassFish 4 promoted builds in the near future. JPA 2.1 will be delivered as part of Java EE 7. The different components in the Java EE 7 platform are tracked here. JPA 2.1 Expert Group has released Early Draft 2 of the specification. Section 9.4 and 11.2 provide all details about Schema Generation. The latest javadocs can be obtained from here. And the JPA EG would appreciate feedback.

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• JPA 2?EJB 3.1?JSF 2????????! WebLogic Server 12c?????????Java EE 6??????|WebLogic Channel|??????

  - by ???02

  ????????????????????????????????????????·???????????Java EE 6???????????????·????WebLogic Server 12c?(???)?????????Oracle Enterprise Pack for Eclipse 12c?????Java EE 6??????3???????????????????????JSF 2.0?????????????????????????JAX-RS????RESTful?Web???????????????(???)?????????????JSF 2.0????????????????　Java EE 6??????????????????????????????????????JSF(JavaServer Faces) 2.0??????????Java EE?????????????????????????????????Struts????????????????????????????????JSF 2.0?Java EE 6??????????????????????????????????????????????????JSP(JavaServer Pages)?JSF???????????????????????·???????????????????????Web????????????????????????????????????????????????????????????????????????????????　???????????????????????????????EJB??????????????EMPLOYEES??????????????????????XHTML????????????????????????????????????????????????????????????ManagedBean????????????JSF 2.0?????????????????????　?????????Oracle Enterprise Pack for Eclipse(OEPE)?????????????????Eclipse(OEPE)???????·?????OOW?????????????????·???????????Properties?????????????????·???·????????????????????????????Project Facets????????????JavaServer Faces?????????????Apply?????????OK????????????　???JSF????????????????????????????ManagedBean???IndexBean?????????????OOW??????????????????·???????????????NEW?-?Class??????New Java Class??????????????????????Package????managed???Name????IndexBean???????Finish????????????　?????IndexBean??????·????????????????????????????????????????????IndexBean(IndexBean.java)?package managed;import java.util.ArrayList;import java.util.List;import javax.ejb.EJB;import javax.faces.bean.ManagedBean;import ejb.EmpLogic;import model.Employee;@ManagedBeanpublic class IndexBean {　　@EJB　　private EmpLogic empLogic;　　private String keyword;　　private List<Employee> results = new ArrayList<Employee>();　　public String getKeyword() {　　　　return keyword;　　}　　public void setKeyword(String keyword) {　　　　this.keyword = keyword;　　}　　public List getResults() {　　　　return results;　　}　　public void actionSearch() {　　　　results.clear();　　　　results.addAll(empLogic.getEmp(keyword));　　}}　????????????????keyword?results??????????????????????????????Session Bean???EmpLogic?????????????????@EJB?????????????????????????????????????????????????????????????????????actionSearch??????????????EmpLogic?????????·????????????????????result????????　???ManagedBean?????????????????????????????????????????·??????OOW??????????????WebContent???????index.xhtml?????　???????????index.xhtml????????????????????????????????????????????????(Index.xhtml)?<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 　　"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"　　xmlns:ui="http://java.sun.com/jsf/facelets"　　xmlns:h="http://java.sun.com/jsf/html"　　xmlns:f="http://java.sun.com/jsf/core"><h:head>　　<title>Employee??????</title></h:head><h:body>　　<h:form>　　　　<h:inputText value="#{indexBean.keyword}" />　　　　<h:commandButton action="#{indexBean.actionSearch}" value="??" />　　　　<h:dataTable value="#{indexBean.results}" var="emp" border="1">　　　　　　<h:column>　　　　　　　　<f:facet name="header">　　　　　　　　　　<h:outputText value="employeeId" />　　　　　　　　</f:facet>　　　　　　　　<h:outputText value="#{emp.employeeId}" />　　　　　　</h:column>　　　　　　<h:column>　　　　　　　　<f:facet name="header">　　　　　　　　　　<h:outputText value="firstName" />　　　　　　　　</f:facet>　　　　　　　　<h:outputText value="#{emp.firstName}" />　　　　　　</h:column>　　　　　　<h:column>　　　　　　　　<f:facet name="header">　　　　　　　　　　<h:outputText value="lastName" />　　　　　　　　</f:facet>　　　　　　　　<h:outputText value="#{emp.lastName}" />　　　　　　</h:column>　　　　　　<h:column>　　　　　　　　<f:facet name="header">　　　　　　　　　　<h:outputText value="salary" />　　　　　　　　</f:facet>　　　　　　　　<h:outputText value="#{emp.salary}" />　　　　　　</h:column>　　　　</h:dataTable>　　</h:form></h:body></html>　index.xhtml???????????????????ManagedBean???IndexBean??????????????????????????????IndexBean?????actionSearch??????????h:commandButton????????????????????????????????????????　???Web???????????????(web.xml)??????web.xml???????·?????OOW???????????WebContent?-?WEB-INF??????　?????????????web-app??????????????welcome-file-list(????)?????????????Web???????????????(web.xml)?<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:javaee="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="3.0">　　<javaee:display-name>OOW</javaee:display-name>　　<servlet>　　　　<servlet-name>Faces Servlet</servlet-name>　　　　<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>　　　　<load-on-startup>1</load-on-startup>　　</servlet>　　<servlet-mapping>　　　　<servlet-name>Faces Servlet</servlet-name>　　　　<url-pattern>/faces/*</url-pattern>　　</servlet-mapping>　　<welcome-file-list>　　　　<welcome-file>/faces/index.xhtml</welcome-file>　　</welcome-file-list></web-app>　???JSF?????????????????????????????　??????Java EE 6?JPA 2.0?EJB 3.1?JSF 2.0????????????????????????????????????????????????????????????????·?????OOW???????????·???????????????Run As?-?Run on Server??????????????????????????????????????????????????????????Oracle WebLogic Server 12c(12.1.1)??????Next???????????????　?????????????????????Domain Directory??????Browse????????????????????????C:\Oracle\Middleware\user_projects\domains\base_domain??????Finish????????????　?????WebLogic Server?????????????????????????????????????????????????????????????????????OEPE??Servers???????Oracle WebLogic Server 12c???????????·???????????????Properties??????????????????????????????WebLogic?-?Publishing????????????Publish as an exploded archive??????????????????OK????????????　???????????????????????????????????????????·?????OOW???????????·???????????????Run As?-?Run on Server??????????????????Finish????????????　???????????????????????????????????????????????·??????????????????????????????????????????firstName?????????????????JAX-RS???RESTful?Web???????　?????????JAX-RS????RESTful?Web???????????????　Java EE??????????Java EE 5???SOAP????Web??????????JAX-WS??????????Java EE 6????????JAX-RS?????????????RESTful?Web????????????·????????????????????????JAX-RS????????Session Bean??????·?????????Web???????????????????????????????????????????????JAX-RS??????????　?????????????????????????????JAX-RS???RESTful Web??????????????????????????·?????OOW???????????·???????????????Properties???????????????????????????Project Facets?????????????JAX-RS(Rest Web Services)???????????Further configuration required?????????????Modify Faceted Project???????????????JAX-RS??????·?????????????????JAX-RS Implementation Library??????Manage libraries????(???????????)??????????????　??????Preference(Filtered)???????????????New????????????????New User Library????????????????User library name????JAX-RS???????OK???????????????????Preference(Filtered)?????????????Add JARs????????????????????????C:\Oracle\Middleware\modules \com.sun.jersey.core_1.1.0.0_1-9.jar??????OK????????????　???Modify Faceted Project??????????JAX-RS Implementation Library????JAX-RS????????????????????JAX-RS servlet class name????com.sun.jersey.spi.container.servlet.ServletContainer???????OK?????????????Project Facets???????????????????OK??????????????????　???RESTful Web??????????????????????????????????(???????EmpLogic?????????????)??RESTful Web?????????????EmpLogic(EmpLogic.java)?package ejb; import java.util.List; import javax.ejb.LocalBean; import javax.ejb.Stateless; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; import javax.ws.rs.GET;import javax.ws.rs.Path;import javax.ws.rs.PathParam;import javax.ws.rs.Produces;import model.Employee; @Stateless @LocalBean @Path("/emprest")public class EmpLogic { 　　　　@PersistenceContext(unitName = "OOW") 　　　　private EntityManager em; 　　　　public EmpLogic() { 　　　　}　　@GET　　@Path("/getname/{empno}")  // ?　　@Produces("text/plain")  // ?　　public String getEmpName(@PathParam("empno") long empno) {　　　　Employee e = em.find(Employee.class, empno);　　　　if (e == null) {　　　　　　return "no data.";　　　　} else {　　　　　　return e.getFirstName();　　　　}　　}}　?????????????????????@Path("/emprest ")????????????RESTful Web????????????HTTP??????????????JAX-RS????????????????????????RESTful Web?????Web??????????????????@Produces???????(?)??????????????????????????text/plain????????????????????????????application/xml?????????XML???????????application/json?????JSON??????????????????　???????????????Web???????????????????????????????????????·?????OOW???????????·???????????????Run As?-?Run on Server??????????????????Finish???????????????????Web??????http://localhost:7001/OOW/jaxrs/emprest/getname/186????????????????URL?????????(186)?employeeId?????????????firstName????????????????*　　　　*　　　　*　????????3??????WebLogic Server 12c?OEPE????Java EE 6?????????????????Java EE 6????????????????·????????????????????????????Java EE?????????????????????????????????????????????????????????????????????????????????

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• Replacing instructions in a method's MethodBody

  - by Alix

  Hi, (First of all, this is a very lengthy post, but don't worry: I've already implemented all of it, I'm just asking your opinion.) I'm having trouble implementing the following; I'd appreciate some help: I get a Type as parameter. I define a subclass using reflection. Notice that I don't intend to modify the original type, but create a new one. I create a property per field of the original class, like so: public class OriginalClass { private int x; } public class Subclass : OriginalClass { private int x; public int X { get { return x; } set { x = value; } } } For every method of the superclass, I create an analogous method in the subclass. The method's body must be the same except that I replace the instructions ldfld x with callvirt this.get_X, that is, instead of reading from the field directly I call the get accessor. I'm having trouble with step 4. I know you're not supposed to manipulate code like this, but I really need to. Here's what I've tried: Attempt #1: Use Mono.Cecil. This would allow me to parse the body of the method into human-readable Instructions, and easily replace instructions. However, the original type isn't in a .dll file, so I can't find a way to load it with Mono.Cecil. Writing the type to a .dll, then load it, then modify it and write the new type to disk (which I think is the way you create a type with Mono.Cecil), and then load it seems like a huge overhead. Attempt #2: Use Mono.Reflection. This would also allow me to parse the body into Instructions, but then I have no support for replacing instructions. I've implemented a very ugly and inefficient solution using Mono.Reflection, but it doesn't yet support methods that contain try-catch statements (although I guess I can implement this) and I'm concerned that there may be other scenarios in which it won't work, since I'm using the ILGenerator in a somewhat unusual way. Also, it's very ugly ;). Here's what I've done: private void TransformMethod(MethodInfo methodInfo) { // Create a method with the same signature. ParameterInfo[] paramList = methodInfo.GetParameters(); Type[] args = new Type[paramList.Length]; for (int i = 0; i < args.Length; i++) { args[i] = paramList[i].ParameterType; } MethodBuilder methodBuilder = typeBuilder.DefineMethod( methodInfo.Name, methodInfo.Attributes, methodInfo.ReturnType, args); ILGenerator ilGen = methodBuilder.GetILGenerator(); // Declare the same local variables as in the original method. IList<LocalVariableInfo> locals = methodInfo.GetMethodBody().LocalVariables; foreach (LocalVariableInfo local in locals) { ilGen.DeclareLocal(local.LocalType); } // Get readable instructions. IList<Instruction> instructions = methodInfo.GetInstructions(); // I first need to define labels for every instruction in case I // later find a jump to that instruction. Once the instruction has // been emitted I cannot label it, so I'll need to do it in advance. // Since I'm doing a first pass on the method's body anyway, I could // instead just create labels where they are truly needed, but for // now I'm using this quick fix. Dictionary<int, Label> labels = new Dictionary<int, Label>(); foreach (Instruction instr in instructions) { labels[instr.Offset] = ilGen.DefineLabel(); } foreach (Instruction instr in instructions) { // Mark this instruction with a label, in case there's a branch // instruction that jumps here. ilGen.MarkLabel(labels[instr.Offset]); // If this is the instruction that I want to replace (ldfld x)... if (instr.OpCode == OpCodes.Ldfld) { // ...get the get accessor for the accessed field (get_X()) // (I have the accessors in a dictionary; this isn't relevant), MethodInfo safeReadAccessor = dataMembersSafeAccessors[((FieldInfo) instr.Operand).Name][0]; // ...instead of emitting the original instruction (ldfld x), // emit a call to the get accessor, ilGen.Emit(OpCodes.Callvirt, safeReadAccessor); // Else (it's any other instruction), reemit the instruction, unaltered. } else { Reemit(instr, ilGen, labels); } } } And here comes the horrible, horrible Reemit method: private void Reemit(Instruction instr, ILGenerator ilGen, Dictionary<int, Label> labels) { // If the instruction doesn't have an operand, emit the opcode and return. if (instr.Operand == null) { ilGen.Emit(instr.OpCode); return; } // Else (it has an operand)... // If it's a branch instruction, retrieve the corresponding label (to // which we want to jump), emit the instruction and return. if (instr.OpCode.FlowControl == FlowControl.Branch) { ilGen.Emit(instr.OpCode, labels[Int32.Parse(instr.Operand.ToString())]); return; } // Otherwise, simply emit the instruction. I need to use the right // Emit call, so I need to cast the operand to its type. Type operandType = instr.Operand.GetType(); if (typeof(byte).IsAssignableFrom(operandType)) ilGen.Emit(instr.OpCode, (byte) instr.Operand); else if (typeof(double).IsAssignableFrom(operandType)) ilGen.Emit(instr.OpCode, (double) instr.Operand); else if (typeof(float).IsAssignableFrom(operandType)) ilGen.Emit(instr.OpCode, (float) instr.Operand); else if (typeof(int).IsAssignableFrom(operandType)) ilGen.Emit(instr.OpCode, (int) instr.Operand); ... // you get the idea. This is a pretty long method, all like this. } Branch instructions are a special case because instr.Operand is SByte, but Emit expects an operand of type Label. Hence the need for the Dictionary labels. As you can see, this is pretty horrible. What's more, it doesn't work in all cases, for instance with methods that contain try-catch statements, since I haven't emitted them using methods BeginExceptionBlock, BeginCatchBlock, etc, of ILGenerator. This is getting complicated. I guess I can do it: MethodBody has a list of ExceptionHandlingClause that should contain the necessary information to do this. But I don't like this solution anyway, so I'll save this as a last-resort solution. Attempt #3: Go bare-back and just copy the byte array returned by MethodBody.GetILAsByteArray(), since I only want to replace a single instruction for another single instruction of the same size that produces the exact same result: it loads the same type of object on the stack, etc. So there won't be any labels shifting and everything should work exactly the same. I've done this, replacing specific bytes of the array and then calling MethodBuilder.CreateMethodBody(byte[], int), but I still get the same error with exceptions, and I still need to declare the local variables or I'll get an error... even when I simply copy the method's body and don't change anything. So this is more efficient but I still have to take care of the exceptions, etc. Sigh. Here's the implementation of attempt #3, in case anyone is interested: private void TransformMethod(MethodInfo methodInfo, Dictionary<string, MethodInfo[]> dataMembersSafeAccessors, ModuleBuilder moduleBuilder) { ParameterInfo[] paramList = methodInfo.GetParameters(); Type[] args = new Type[paramList.Length]; for (int i = 0; i < args.Length; i++) { args[i] = paramList[i].ParameterType; } MethodBuilder methodBuilder = typeBuilder.DefineMethod( methodInfo.Name, methodInfo.Attributes, methodInfo.ReturnType, args); ILGenerator ilGen = methodBuilder.GetILGenerator(); IList<LocalVariableInfo> locals = methodInfo.GetMethodBody().LocalVariables; foreach (LocalVariableInfo local in locals) { ilGen.DeclareLocal(local.LocalType); } byte[] rawInstructions = methodInfo.GetMethodBody().GetILAsByteArray(); IList<Instruction> instructions = methodInfo.GetInstructions(); int k = 0; foreach (Instruction instr in instructions) { if (instr.OpCode == OpCodes.Ldfld) { MethodInfo safeReadAccessor = dataMembersSafeAccessors[((FieldInfo) instr.Operand).Name][0]; // Copy the opcode: Callvirt. byte[] bytes = toByteArray(OpCodes.Callvirt.Value); for (int m = 0; m < OpCodes.Callvirt.Size; m++) { rawInstructions[k++] = bytes[put.Length - 1 - m]; } // Copy the operand: the accessor's metadata token. bytes = toByteArray(moduleBuilder.GetMethodToken(safeReadAccessor).Token); for (int m = instr.Size - OpCodes.Ldfld.Size - 1; m >= 0; m--) { rawInstructions[k++] = bytes[m]; } // Skip this instruction (do not replace it). } else { k += instr.Size; } } methodBuilder.CreateMethodBody(rawInstructions, rawInstructions.Length); } private static byte[] toByteArray(int intValue) { byte[] intBytes = BitConverter.GetBytes(intValue); if (BitConverter.IsLittleEndian) Array.Reverse(intBytes); return intBytes; } private static byte[] toByteArray(short shortValue) { byte[] intBytes = BitConverter.GetBytes(shortValue); if (BitConverter.IsLittleEndian) Array.Reverse(intBytes); return intBytes; } (I know it isn't pretty. Sorry. I put it quickly together to see if it would work.) I don't have much hope, but can anyone suggest anything better than this? Sorry about the extremely lengthy post, and thanks.

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• Inserting instructions into method.

  - by Alix

  Hi, (First of all, this is a very lengthy post, but don't worry: I've already implemented all of it, I'm just asking your opinion.) I'm having trouble implementing the following; I'd appreciate some help: I get a Type as parameter. I define a subclass using reflection. Notice that I don't intend to modify the original type, but create a new one. I create a property per field of the original class, like so: [- ignore this text here; I had to add something or the formatting wouldn't work <-] public class OriginalClass { private int x; } public class Subclass : OriginalClass { private int x; public int X { get { return x; } set { x = value; } } } [This is number 4! Numbered lists don't work if you add code in between; sorry] For every method of the superclass, I create an analogous method in the subclass. The method's body must be the same except that I replace the instructions ldfld x with callvirt this.get_X, that is, instead of reading from the field directly I call the get accessor. I'm having trouble with step 4. I know you're not supposed to manipulate code like this, but I really need to. Here's what I've tried: Attempt #1: Use Mono.Cecil. This would allow me to parse the body of the method into human-readable Instructions, and easily replace instructions. However, the original type isn't in a .dll file, so I can't find a way to load it with Mono.Cecil. Writing the type to a .dll, then load it, then modify it and write the new type to disk (which I think is the way you create a type with Mono.Cecil), and then load it seems like a huge overhead. Attempt #2: Use Mono.Reflection. This would also allow me to parse the body into Instructions, but then I have no support for replacing instructions. I've implemented a very ugly and inefficient solution using Mono.Reflection, but it doesn't yet support methods that contain try-catch statements (although I guess I can implement this) and I'm concerned that there may be other scenarios in which it won't work, since I'm using the ILGenerator in a somewhat unusual way. Also, it's very ugly ;). Here's what I've done: private void TransformMethod(MethodInfo methodInfo) { // Create a method with the same signature. ParameterInfo[] paramList = methodInfo.GetParameters(); Type[] args = new Type[paramList.Length]; for (int i = 0; i < args.Length; i++) { args[i] = paramList[i].ParameterType; } MethodBuilder methodBuilder = typeBuilder.DefineMethod( methodInfo.Name, methodInfo.Attributes, methodInfo.ReturnType, args); ILGenerator ilGen = methodBuilder.GetILGenerator(); // Declare the same local variables as in the original method. IList<LocalVariableInfo> locals = methodInfo.GetMethodBody().LocalVariables; foreach (LocalVariableInfo local in locals) { ilGen.DeclareLocal(local.LocalType); } // Get readable instructions. IList<Instruction> instructions = methodInfo.GetInstructions(); // I first need to define labels for every instruction in case I // later find a jump to that instruction. Once the instruction has // been emitted I cannot label it, so I'll need to do it in advance. // Since I'm doing a first pass on the method's body anyway, I could // instead just create labels where they are truly needed, but for // now I'm using this quick fix. Dictionary<int, Label> labels = new Dictionary<int, Label>(); foreach (Instruction instr in instructions) { labels[instr.Offset] = ilGen.DefineLabel(); } foreach (Instruction instr in instructions) { // Mark this instruction with a label, in case there's a branch // instruction that jumps here. ilGen.MarkLabel(labels[instr.Offset]); // If this is the instruction that I want to replace (ldfld x)... if (instr.OpCode == OpCodes.Ldfld) { // ...get the get accessor for the accessed field (get_X()) // (I have the accessors in a dictionary; this isn't relevant), MethodInfo safeReadAccessor = dataMembersSafeAccessors[((FieldInfo) instr.Operand).Name][0]; // ...instead of emitting the original instruction (ldfld x), // emit a call to the get accessor, ilGen.Emit(OpCodes.Callvirt, safeReadAccessor); // Else (it's any other instruction), reemit the instruction, unaltered. } else { Reemit(instr, ilGen, labels); } } } And here comes the horrible, horrible Reemit method: private void Reemit(Instruction instr, ILGenerator ilGen, Dictionary<int, Label> labels) { // If the instruction doesn't have an operand, emit the opcode and return. if (instr.Operand == null) { ilGen.Emit(instr.OpCode); return; } // Else (it has an operand)... // If it's a branch instruction, retrieve the corresponding label (to // which we want to jump), emit the instruction and return. if (instr.OpCode.FlowControl == FlowControl.Branch) { ilGen.Emit(instr.OpCode, labels[Int32.Parse(instr.Operand.ToString())]); return; } // Otherwise, simply emit the instruction. I need to use the right // Emit call, so I need to cast the operand to its type. Type operandType = instr.Operand.GetType(); if (typeof(byte).IsAssignableFrom(operandType)) ilGen.Emit(instr.OpCode, (byte) instr.Operand); else if (typeof(double).IsAssignableFrom(operandType)) ilGen.Emit(instr.OpCode, (double) instr.Operand); else if (typeof(float).IsAssignableFrom(operandType)) ilGen.Emit(instr.OpCode, (float) instr.Operand); else if (typeof(int).IsAssignableFrom(operandType)) ilGen.Emit(instr.OpCode, (int) instr.Operand); ... // you get the idea. This is a pretty long method, all like this. } Branch instructions are a special case because instr.Operand is SByte, but Emit expects an operand of type Label. Hence the need for the Dictionary labels. As you can see, this is pretty horrible. What's more, it doesn't work in all cases, for instance with methods that contain try-catch statements, since I haven't emitted them using methods BeginExceptionBlock, BeginCatchBlock, etc, of ILGenerator. This is getting complicated. I guess I can do it: MethodBody has a list of ExceptionHandlingClause that should contain the necessary information to do this. But I don't like this solution anyway, so I'll save this as a last-resort solution. Attempt #3: Go bare-back and just copy the byte array returned by MethodBody.GetILAsByteArray(), since I only want to replace a single instruction for another single instruction of the same size that produces the exact same result: it loads the same type of object on the stack, etc. So there won't be any labels shifting and everything should work exactly the same. I've done this, replacing specific bytes of the array and then calling MethodBuilder.CreateMethodBody(byte[], int), but I still get the same error with exceptions, and I still need to declare the local variables or I'll get an error... even when I simply copy the method's body and don't change anything. So this is more efficient but I still have to take care of the exceptions, etc. Sigh. Here's the implementation of attempt #3, in case anyone is interested: private void TransformMethod(MethodInfo methodInfo, Dictionary<string, MethodInfo[]> dataMembersSafeAccessors, ModuleBuilder moduleBuilder) { ParameterInfo[] paramList = methodInfo.GetParameters(); Type[] args = new Type[paramList.Length]; for (int i = 0; i < args.Length; i++) { args[i] = paramList[i].ParameterType; } MethodBuilder methodBuilder = typeBuilder.DefineMethod( methodInfo.Name, methodInfo.Attributes, methodInfo.ReturnType, args); ILGenerator ilGen = methodBuilder.GetILGenerator(); IList<LocalVariableInfo> locals = methodInfo.GetMethodBody().LocalVariables; foreach (LocalVariableInfo local in locals) { ilGen.DeclareLocal(local.LocalType); } byte[] rawInstructions = methodInfo.GetMethodBody().GetILAsByteArray(); IList<Instruction> instructions = methodInfo.GetInstructions(); int k = 0; foreach (Instruction instr in instructions) { if (instr.OpCode == OpCodes.Ldfld) { MethodInfo safeReadAccessor = dataMembersSafeAccessors[((FieldInfo) instr.Operand).Name][0]; byte[] bytes = toByteArray(OpCodes.Callvirt.Value); for (int m = 0; m < OpCodes.Callvirt.Size; m++) { rawInstructions[k++] = bytes[put.Length - 1 - m]; } bytes = toByteArray(moduleBuilder.GetMethodToken(safeReadAccessor).Token); for (int m = instr.Size - OpCodes.Ldfld.Size - 1; m >= 0; m--) { rawInstructions[k++] = bytes[m]; } } else { k += instr.Size; } } methodBuilder.CreateMethodBody(rawInstructions, rawInstructions.Length); } private static byte[] toByteArray(int intValue) { byte[] intBytes = BitConverter.GetBytes(intValue); if (BitConverter.IsLittleEndian) Array.Reverse(intBytes); return intBytes; } private static byte[] toByteArray(short shortValue) { byte[] intBytes = BitConverter.GetBytes(shortValue); if (BitConverter.IsLittleEndian) Array.Reverse(intBytes); return intBytes; } (I know it isn't pretty. Sorry. I put it quickly together to see if it would work.) I don't have much hope, but can anyone suggest anything better than this? Sorry about the extremely lengthy post, and thanks.

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• Alright, I'm still stuck on this homework problem. C++

  - by Josh

  Okay, the past few days I have been trying to get some input on my programs. Well I decided to scrap them for the most part and try again. So once again, I'm in need of help. For the first program I'm trying to fix, it needs to show the sum of SEVEN numbers. Well, I'm trying to change is so that I don't need the mem[##] = ####. I just want the user to be able to input the numbers and the program run from there and go through my switch loop. And have some kind of display..saying like the sum is?.. Here's my code so far. #include <iostream> #include <iomanip> #include <ios> using namespace std; int main() { const int READ = 10; const int WRITE = 11; const int LOAD = 20; const int STORE = 21; const int ADD = 30; const int SUBTRACT = 31; const int DIVIDE = 32; const int MULTIPLY = 33; const int BRANCH = 40; const int BRANCHNEG = 41; const int BRANCHZERO = 42; const int HALT = 43; int mem[100] = {0}; //Making it 100, since simpletron contains a 100 word mem. int operation; //taking the rest of these variables straight out of the book seeing as how they were italisized. int operand; int accum = 0; // the special register is starting at 0 int counter; for ( counter=0; counter < 100; counter++) mem[counter] = 0; // This is for part a, it will take in positive variables in //a sent-controlled loop and compute + print their sum. Variables from example in text. mem[0] = 1009; mem[1] = 1109; mem[2] = 2010; mem[3] = 2111; mem[4] = 2011; mem[5] = 3100; mem[6] = 2113; mem[7] = 1113; mem[8] = 4300; counter = 0; //Makes the variable counter start at 0. while(true) { operand = mem[ counter ]%100; // Finds the op codes from the limit on the mem (100) operation = mem[ counter ]/100; //using a switch loop to set up the loops for the cases switch ( operation ){ case READ: //reads a variable into a word from loc. Enter in -1 to exit cout <<"\n Input a positive variable: "; cin >> mem[ operand ]; counter++; break; case WRITE: // takes a word from location cout << "\n\nThe content at location " << operand << " is " << mem[operand]; counter++; break; case LOAD:// loads accum = mem[ operand ];counter++; break; case STORE: //stores mem[ operand ] = accum;counter++; break; case ADD: //adds accum += mem[operand];counter++; break; case SUBTRACT: // subtracts accum-= mem[ operand ];counter++; break; case DIVIDE: //divides accum /=(mem[ operand ]);counter++; break; case MULTIPLY: // multiplies accum*= mem [ operand ];counter++; break; case BRANCH: // Branches to location counter = operand; break; case BRANCHNEG: //branches if acc. is < 0 if (accum < 0) counter = operand; else counter++; break; case BRANCHZERO: //branches if acc = 0 if (accum == 0) counter = operand; else counter++; break; case HALT: // Program ends break; } } return 0; } part B int main() { const int READ = 10; const int WRITE = 11; const int LOAD = 20; const int STORE = 21; const int ADD = 30; const int SUBTRACT = 31; const int DIVIDE = 32; const int MULTIPLY = 33; const int BRANCH = 40; const int BRANCHNEG = 41; const int BRANCHZERO = 41; const int HALT = 43; int mem[100] = {0}; int operation; int operand; int accum = 0; int pos = 0; int j; mem[22] = 7; // loop 7 times mem[25] = 1; // increment by 1 mem[00] = 4306; mem[01] = 2303; mem[02] = 3402; mem[03] = 6410; mem[04] = 3412; mem[05] = 2111; mem[06] = 2002; mem[07] = 2312; mem[08] = 4210; mem[09] = 2109; mem[10] = 4001; mem[11] = 2015; mem[12] = 3212; mem[13] = 2116; mem[14] = 1101; mem[15] = 1116; mem[16] = 4300; j = 0; while ( true ) { operand = memory[ j ]%100; // Finds the op codes from the limit on the memory (100) operation = memory[ j ]/100; //using a switch loop to set up the loops for the cases switch ( operation ){ case 1: //reads a variable into a word from loc. Enter in -1 to exit cout <<"\n enter #: "; cin >> memory[ operand ]; break; case 2: // takes a word from location cout << "\n\nThe content at location " << operand << "is " << memory[operand]; break; case 3:// loads accum = memory[ operand ]; break; case 4: //stores memory[ operand ] = accum; break; case 5: //adds accum += mem[operand];; break; case 6: // subtracts accum-= memory[ operand ]; break; case 7: //divides accum /=(memory[ operand ]); break; case 8: // multiplies accum*= memory [ operand ]; break; case 9: // Branches to location j = operand; break; case 10: //branches if acc. is < 0 break; case 11: //branches if acc = 0 if (accum == 0) j = operand; break; case 12: // Program ends exit(0); break; } j++; } return 0; }

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• How to improve performance of map that loads new overlay images

  - by anthonysomerset

  I have inherited a website to maintain that uses a html map overlaying a real map to link specific countries to specific pages. previously it loaded the default map image, then with some javascript it would change the image src to an image with that particular country in a different colour on mouseover and reset the image source back to the original image on mouse out to make maintenance (adding new countries) easier i made the initial map a background image by utilising some CSS for the div tag, and then created new images for each country which only had that countries hightlight so that the images remain fairly small. this works great but theres one issue which is particularly noticeable on slower internet connections when you hover over a country if you dont have the image file in your browser cache or downloaded it wont load the image unless you hover over another country and then back onto the first country - i guess this is due to the image having to manually be downloaded on first hover. My question: is it possible to force the load of these extra images AFTER the page and all the other assets have finished loading so that this behaviour is all but eliminated? the html code for the MAP is as follows: <div class="gtmap"><img id="Image-Maps_6200909211657061" src="<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-blank.png" usemap="#Image-Maps_6200909211657061" alt="We offer Guided Motorcycle Tours all around the world" width="615" height="296" /> <map id="_Image-Maps_6200909211657061" name="Image-Maps_6200909211657061"> <area shape="poly" coords="511,134,532,107,542,113,520,141" href="/guided-motorcycle-tours-japan/" alt="Guided Japan Motorcycle Tours" title="Japan" onmouseover="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-japan.png';" onmouseout="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-blank.png';" /> <area shape="poly" coords="252,61,266,58,275,64,262,68" href="/guided-motorcycle-tour.php?iceland-motorcycle-adventure-39" alt="Guided Iceland Motorcycle Tours" title="Iceland" onmouseover="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-iceland.png';" onmouseout="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-blank.png';" /> <area shape="poly" coords="587,246,597,256,577,279,568,270" href="/guided-motorcycle-tour.php?new-zealand-south-island-adventure-10" alt="New Zealand Guided Motorcycle Tours" title="New Zealand" onmouseover="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-nz.png';" onmouseout="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-blank.png';" /> <area shape="poly" coords="418,133,412,145,412,154,421,178,430,180,430,166,443,154,443,145,438,144,433,142,430,138,431,130,430,129,425,128" href="/guided-motorcycle-tours-india/" alt="India Guided Motorcycle Tours" title="India" onmouseover="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-india.png';" onmouseout="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-blank.png';" /> <area shape="poly" coords="460,152,466,149,474,165,470,171,466,161" href="/guided-motorcycle-tours-laos/" alt="Laos Guided Motorcycle Tours" title="Laos" onmouseover="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-laos.png';" onmouseout="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-blank.png';" /> <area shape="poly" coords="468,179,475,166,468,152,475,152,482,169" href="/guided-motorcycle-tour.php?indochina-motorcycle-adventure-tour-32" onClick="javascript: pageTracker._trackPageview('/internal-links/guided-tours/map/vietnam');" alt="Vietnam Guided Motorcycle Tours" title="Vietnam" onmouseover="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-viet.png';" onmouseout="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-blank.png';" /> <area shape="poly" coords="330,239,337,235,347,226,352,233,351,243,344,250,335,253,327,255,323,249,322,242,323,241" href="/guided-motorcycle-tours-southafrica/" alt="South Africa Guided Motorcycle Tours" title="South Africa" onmouseover="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-sa.png';" onmouseout="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-blank.png';" /> <area shape="poly" coords="290,77,293,86,298,96,286,102,285,97,285,89,282,84,282,79" href="/guided-motorcycle-tour.php?great-britain-isle-of-man-scotland-wales-uk-18" alt="United Kingdom" title="United Kingdom Guided Motorcycle Tours" onmouseover="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-uk.png';" onmouseout="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-blank.png';" /> <area shape="poly" coords="357,118,368,118,369,126,345,129,338,125,338,117,342,115,348,116" href="/guided-motorcycle-tour.php?explore-turkey-adventure-45" alt="Turkey" title="Turkey Guided Motorcycle Tours" onmouseover="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-turkey.png';" onmouseout="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-blank.png';" /> <area shape="poly" coords="206,95,193,101,185,101,178,106,165,111,157,109,147,105,134,103,121,103,107,103,96,103,86,104,81,99,77,91,70,83,62,79,60,72,61,64,59,57,60,51,71,50,83,49,95,50,107,54,117,53,129,47,137,36,148,37,163,38,177,44,187,54,195,60,184,72,191,80,200,87" href="/guided-motorcycle-tours-canada/" alt="Guided Canada Motorcycle Tours" title="Canada" onmouseover="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-canada.png';" onmouseout="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-blank.png';" /> <area shape="poly" coords="61,75,60,62,60,55,59,44,51,44,43,43,36,42,28,43,23,48,17,51,15,62,19,74,27,79,19,83,16,93,35,83,43,77,50,75,55,75" href="/guided-motorcycle-tours-alaska/" alt="Guided Alaska Motorcycle Tours" title="Alaska" onmouseover="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-alaska.png';" onmouseout="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-blank.png';" /> <area shape="poly" coords="82,101,99,101,133,101,148,105,161,110,172,106,187,100,180,113,171,122,165,131,159,149,147,141,137,140,129,147,120,141,112,138,103,137,93,132,86,122,86,112,86,106" href="/guided-motorcycle-tours-usa/" alt="USA Guided Motorcycle Tours" title="USA" onmouseover="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-usa.png';" onmouseout="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-blank.png';" /> <area shape="poly" coords="178,225,180,214,175,208,174,204,178,198,174,193,167,192,157,199,158,204,164,211,167,218" href="/guided-motorcycle-tour.php?peru-machu-picchu-adventure-25" alt="Peru Guided Motorcycle Tours" title="Peru" onmouseover="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-peru.png';" onmouseout="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-blank.png';" /> <area shape="poly" coords="172,226,169,239,166,256,166,267,164,279,171,277,174,262,175,250,179,234,180,225,176,224" href="/guided-motorcycle-tours-chile/" alt="Guided Chile Motorcycle Tours" title="Chile" onmouseover="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-chile.png';" onmouseout="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-blank.png';" /> <area shape="poly" coords="199,260,194,261,187,265,184,276,183,296,170,292,168,282,174,270,174,257,177,245,180,230,190,228,205,237,199,245" href="/guided-motorcycle-tours-argentina/" alt="Guided Argentina Motorcycle Tours" title="Argentina" onmouseover="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-arg.png';" onmouseout="if(document.images) document.getElementById('Image-Maps_6200909211657061').src='<?php echo cdnhttpsCheck(); ?>assets/wmap/a-guided-tours-map-blank.png';" /> </map> </div> The <?php echo cdnhttpsCheck(); ?> is just a site specific function that gets the correct web domain/url from a config file to load resources from CDN where possible (eg all non HTTPS requests) We are loading Jquery at the bottom of the HTML if anybody wonders why it is missing from the code snippet for reference, the page with the map in question is found here: http://www.motoquest.com/guided-motorcycle-tours/

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• Has Javascript developed beyond what it was originally designed to do?

  - by Elliot Bonneville

  I've been talking with a friend about the purpose of Javascript, when and how it should be used, etc. He quoted that: JavaScript was designed to add interactivity to HTML pages [...] JavaScript gives HTML designers a programming tool HTML authors are normally not programmers, but JavaScript is a scripting language with a very simple syntax! Almost anyone can put small "snippets" of code into their HTML pages JavaScript can react to events A JavaScript can be set to execute when something happens, like when a page has finished loading or when a user clicks on an HTML element JavaScript can read and write HTML elements A JavaScript can read and change the content of an HTML element JavaScript can be used to validate data A JavaScript can be used to validate form data before it is submitted to a server. This saves the server from extra processing JavaScript can be used to detect the visitor's browser - A JavaScript can be used to detect the visitor's browser, and - depending on the browser - load another page specifically designed for that browser. JavaScript can be used to create cookies - A JavaScript can be used to store and retrieve information on the visitor's computer. However, it seems like Javascript's getting used to do a lot more than these days. My friend also advocates against using Javascript's OOP functionality, claiming that "you shouldn't be processing data, merely validating." Is Javascript really limited to validating data and making flashy graphics on a web page? He goes on to claim "you shouldn't be attempting to access databases through javascript" and also says " in general you don't want to be doing your heavy lifting in javascript". I can't say I agree with his opinion, but I'd like to get some more input on this. So, my question: Has Javascript evolved from the definition above to something more powerful, has the way we use it changed, or am I just plain wrong? While I realize this is a subjective question, I can't find any more information on it, so a few links would be good, if nothing else. I'm not looking for a debate, just an answer.

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• Best Practice for captcha based protection against D.O.S to Nginx Proxy

  - by user325320

  The idea is explained here In simple words, Nginx Proxy plays the role of load balance and transmits the HTTP/HTTPS requests to servers. If the number of request times within a certain period from an individual IP exceeds a threshold, it will trigger a captcha for the upcoming requests. And the end-user must input the correct captcha code before he can continue to access the site. Do you know any open source / free NGINX module for this usage? I searched on the Internet and here is one of them: https://github.com/snbuback/nginx seems it needs modification. Any suggestion / experience is welcome, thank you

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• Redmine on Apache2 with Passenger issue

  - by nkr1pt

  I installed Redmine and run it in Apache2 with the Passenger module. Apache2 boots, Passenger module gets loaded and the Redmine welcome page is shown, however when trying to login or navigate to other parts of the Redmine site, the browser keeps loading and loading and loading forever, although the Redmine production.log indicates redirects and HTTP 200 codes in the header, so everything seems to work correctly according to the log. I tested in various browsers. Does anyone have an idea what could be wrong? I will add apache configuration and some relevant log snippets from both apache and redmine hereafter. Apache2 Redmine configuration: DocumentRoot /var/www <Directory /var/www/redmine> RailsEnv production AllowOverride all RailsBaseURI /redmine PassengerResolveSymLinksInDocumentRoot on </Directory> Apache2 error log after booting Apache: [Wed Feb 09 19:59:58 2011] [notice] Apache/2.2.14 (Ubuntu) Phusion_Passenger/3.0.2 DAV/2 SVN/1.6.6 configured -- resuming normal operations Redmine production log after logging in: Logfile created on Wed Feb 09 20:01:40 +0100 2011 Processing WelcomeController#index (for 192.168.1.55 at 2011-02-09 20:01:48) [GET] Parameters: {"action"=>"index", "controller"=>"welcome"} Rendering template within layouts/base Rendering welcome/index Completed in 220ms (View: 96, DB: 16) | 200 OK [http://sirius/redmine] Processing AccountController#login (for 192.168.1.55 at 2011-02-09 20:03:17) [GET] Parameters: {"action"=>"login", "controller"=>"account"} Rendering template within layouts/base Rendering account/login Completed in 85ms (View: 63, DB: 1) | 200 OK [http://sirius/redmine/login] Processing AccountController#login (for 192.168.1.55 at 2011-02-09 20:03:20) [POST] Parameters: {"back_url"=>"http%3A%2F%2Fsirius%2Fredmine", "action"=>"login", "authenticity_token"=>"cEMUZHhRKJU8w3p6d+xQQhJTk4/pnnzUdg5g5fwhxDU=", "username"=>"admin", "controller"=>"account", "password"=>"[FILTERED]", "login"=>"Login \302\273"} Redirected to http://sirius/redmine Completed in 37ms (DB: 6) | 302 Found [http://sirius/redmine/login] Processing WelcomeController#index (for 192.168.1.55 at 2011-02-09 20:03:20) [GET] Parameters: {"action"=>"index", "controller"=>"welcome"} Rendering template within layouts/base Rendering welcome/index Completed in 100ms (View: 77, DB: 6) | 200 OK [http://sirius/redmine] Apache2 error log afterwards: [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/mod_instaweb.cc(247)] ModPagespeed OutputFilter called for request /redmine/login [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/mod_instaweb.cc(272)] unparsed=/redmine/login, absolute_url=http://sirius/redmine/login [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: HtmlParse::StartParse [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/mod_instaweb.cc(299)] Request headers:\nHTTP/1.1 0 Internal Server Error\r\nHost: sirius\r\nUser-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.8) Gecko/20100723 Ubuntu/10.04 (lucid) Firefox/3.6.8\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8\r\nAccept-Language: en-us,en;q=0.5\r\nAccept-Encoding: gzip,deflate\r\nAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\nKeep-Alive: 115\r\nConnection: keep-alive\r\nReferer: http://sirius/redmine\r\nCookie: _redmine_session=BAh7BjoPc2Vzc2lvbl9pZCIlNmVlMzFiMDc4MWQxZDU5ZTI5MTk2NjU0NGY3MzJmYzQ%3D--ea4b7adbc35551051632b5544faaad138ae08d90\r\n\r\n [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/mod_instaweb.cc(302)] request-filename=/var/www/redmine/login, uri=/redmine/login [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/mod_instaweb.cc(319)] ModPagespeed Response headers:\nHTTP/1.1 200 OK\r\nStatus: 200\r\nX-Mod-Pagespeed: 0.9.0.0-128\r\n\r\n [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 2157us: HtmlParse::Flush [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 2272us: HtmlParse::CoalesceAdjacentCharactersNodes [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 2342us: HtmlParse::ApplyFilter:AddHead [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 2407us: HtmlParse::SanityCheck [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 2504us: HtmlParse::ApplyFilter:CssCombine [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/stylesheets/application.css?1296181549 [Wed Feb 09 20:03:17 2011] [warn] [0209/200317:WARNING:net/instaweb/util/google_message_handler.cc(32)] Failed to create or read input resource /redmine/stylesheets/application.css?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/stylesheets/jstoolbar.css?1296181549 [Wed Feb 09 20:03:17 2011] [warn] [0209/200317:WARNING:net/instaweb/util/google_message_handler.cc(32)] Failed to create or read input resource /redmine/stylesheets/jstoolbar.css?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 3642us: HtmlParse::ApplyFilter:CssFilter [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/stylesheets/application.css?1296181549 [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] http://sirius/redmine/login:9: Failed to load resource http://sirius/redmine/stylesheets/application.css?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/stylesheets/jstoolbar.css?1296181549 [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] http://sirius/redmine/login:17: Failed to load resource http://sirius/redmine/stylesheets/jstoolbar.css?1296181549 [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Failed to load resource http://sirius/redmine/stylesheets/jstoolbar.css?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 4863us: HtmlParse::ApplyFilter:Javascript [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:11: Found script with src /redmine/javascripts/prototype.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/javascripts/prototype.js?1296181549 [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] http://sirius/redmine/login: Couldn't fetch resource /redmine/javascripts/prototype.js?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:12: Found script with src /redmine/javascripts/effects.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/javascripts/effects.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] http://sirius/redmine/login: Couldn't fetch resource /redmine/javascripts/effects.js?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: http://sirius/redmine/login: Couldn't fetch resource /redmine/javascripts/effects.js?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:13: Found script with src /redmine/javascripts/dragdrop.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/javascripts/dragdrop.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] Creating connection [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:14: Found script with src /redmine/javascripts/controls.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/javascripts/controls.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] http://sirius/redmine/login: Couldn't fetch resource /redmine/javascripts/controls.js?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:15: Found script with src /redmine/javascripts/application.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/javascripts/application.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] Creating connection [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 8389us: HtmlParse::SanityCheck [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 8588us: HtmlParse::CoalesceAdjacentCharactersNodes [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 8701us: HtmlParse::ApplyFilter:InlineCss [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: 8701us: HtmlParse::ApplyFilter:InlineCss [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/stylesheets/application.css?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] http://sirius/redmine/login: Couldn't fetch resource /redmine/stylesheets/application.css?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 9199us: HtmlParse::ApplyFilter:InlineJs [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/javascripts/prototype.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] http://sirius/redmine/login: Couldn't fetch resource /redmine/javascripts/prototype.js?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/javascripts/effects.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] Creating connectionhttp://sirius/redmine/login: Couldn't fetch resource /redmine/javascripts/effects.js?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connectionhttp://sirius/redmine/login: Couldn't fetch resource /redmine/javascripts/effects.js?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/javascripts/dragdrop.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] http://sirius/redmine/login: Couldn't fetch resource /redmine/javascripts/dragdrop.js?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/javascripts/controls.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] http://sirius/redmine/login: Couldn't fetch resource /redmine/javascripts/controls.js?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/javascripts/application.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] http://sirius/redmine/login: Couldn't fetch resource /redmine/javascripts/application.js?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 11398us: HtmlParse::ApplyFilter:ImgRewrite [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 11506us: HtmlParse::ApplyFilter:CacheExtender [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/stylesheets/application.css?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] http://sirius/redmine/login: Couldn't fetch resource /redmine/stylesheets/application.css?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/javascripts/prototype.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] http://sirius/redmine/login: Couldn't fetch resource /redmine/javascripts/prototype.js?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/javascripts/effects.js?1296181549 [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] http://sirius/redmine/login: Couldn't fetch resource /redmine/javascripts/effects.js?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/javascripts/dragdrop.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] http://sirius/redmine/login: Couldn't fetch resource /redmine/javascripts/dragdrop.js?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/javascripts/controls.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] http://sirius/redmine/login: Couldn't fetch resource /redmine/javascripts/controls.js?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/javascripts/application.js?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] http://sirius/redmine/login: Couldn't fetch resource /redmine/javascripts/application.js?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/stylesheets/jstoolbar.css?1296181549 [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(29)] http://sirius/redmine/login: Couldn't fetch resource /redmine/stylesheets/jstoolbar.css?1296181549 to rewrite. [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 14401us: HtmlParse::ApplyFilter:HtmlWriter [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [notice] [0209/200317:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 15218us: HtmlParse::FinishParse [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:17 2011] [error] [0209/200317:ERROR:net/instaweb/util/google_message_handler.cc(54)] net/instaweb/apache/serf_url_async_fetcher.cc:506: Creating connection [Wed Feb 09 20:03:20 2011] [warn] [client 192.168.1.55] Not GET request: 2., referer: http://sirius/redmine/login [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/apache/mod_instaweb.cc(247)] ModPagespeed OutputFilter called for request /redmine/login [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/apache/mod_instaweb.cc(272)] unparsed=/redmine/login, absolute_url=http://sirius/redmine/login [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: HtmlParse::StartParse [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/apache/mod_instaweb.cc(299)] Request headers:\nHTTP/1.1 0 Internal Server Error\r\nHost: sirius\r\nUser-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.8) Gecko/20100723 Ubuntu/10.04 (lucid) Firefox/3.6.8\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8\r\nAccept-Language: en-us,en;q=0.5\r\nAccept-Encoding: gzip,deflate\r\nAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\nKeep-Alive: 115\r\nConnection: keep-alive\r\nReferer: http://sirius/redmine/login\r\nCookie: _redmine_session=BAh7BzoPc2Vzc2lvbl9pZCIlNmVlMzFiMDc4MWQxZDU5ZTI5MTk2NjU0NGY3MzJmYzQ6EF9jc3JmX3Rva2VuIjFjRU1VWkhoUktKVTh3M3A2ZCt4UVFoSlRrNC9wbm56VWRnNWc1ZndoeERVPQ%3D%3D--8b195ac3cab88b5a1f408e3f18aaddc70782140e\r\nContent-Type: application/x-www-form-urlencoded\r\nContent-Length: 165\r\n\r\n [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/apache/mod_instaweb.cc(302)] request-filename=/var/www/redmine/login, uri=/redmine/login [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/apache/mod_instaweb.cc(319)] ModPagespeed Response headers:\nHTTP/1.1 302 Found\r\nLocation: http://sirius/redmine\r\nStatus: 302\r\nX-Mod-Pagespeed: 0.9.0.0-128\r\n\r\n [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 604us: HtmlParse::Flush [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 697us: HtmlParse::CoalesceAdjacentCharactersNodes [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 758us: HtmlParse::ApplyFilter:AddHead [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 813us: HtmlParse::SanityCheck [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 912us: HtmlParse::CoalesceAdjacentCharactersNodes [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 965us: HtmlParse::ApplyFilter:CssCombine [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 1020us: HtmlParse::ApplyFilter:CssFilter [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 1073us: HtmlParse::ApplyFilter:Javascript [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 1125us: HtmlParse::ApplyFilter:InlineCss [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 1179us: HtmlParse::ApplyFilter:InlineJs [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 1233us: HtmlParse::ApplyFilter:ImgRewrite [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 1285us: HtmlParse::ApplyFilter:CacheExtender [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 1338us: HtmlParse::ApplyFilter:HtmlWriter [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine/login:1: 1415us: HtmlParse::FinishParse [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/apache/mod_instaweb.cc(247)] ModPagespeed OutputFilter called for request /redmine [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/apache/mod_instaweb.cc(272)] unparsed=/redmine, absolute_url=http://sirius/redmine [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine:1: HtmlParse::StartParse [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/apache/mod_instaweb.cc(299)] Request headers:\nHTTP/1.1 0 Internal Server Error\r\nHost: sirius\r\nUser-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.8) Gecko/20100723 Ubuntu/10.04 (lucid) Firefox/3.6.8\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8\r\nAccept-Language: en-us,en;q=0.5\r\nAccept-Encoding: gzip,deflate\r\nAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\nKeep-Alive: 115\r\nConnection: keep-alive\r\nReferer: http://sirius/redmine/login\r\nCookie: _redmine_session=BAh7BzoMdXNlcl9pZGkGOg9zZXNzaW9uX2lkIiVlYjNmYTY5NmZjNzMwYTdhMjA5ZDJmZmM4MTM0MzcyMw%3D%3D--57a4931aae681664d2a6ff6c039ac84b6ebc9e55\r\nIf-None-Match: "76628aff953f11fbdefb77ce3d575718"\r\n\r\n [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/apache/mod_instaweb.cc(302)] request-filename=/var/www/redmine, uri=/redmine [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/apache/mod_instaweb.cc(319)] ModPagespeed Response headers:\nHTTP/1.1 200 OK\r\nStatus: 200\r\nX-Mod-Pagespeed: 0.9.0.0-128\r\n\r\n [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine:1: 1870us: HtmlParse::Flush [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine:1: 1973us: HtmlParse::CoalesceAdjacentCharactersNodes [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine:1: 2040us: HtmlParse::ApplyFilter:AddHead [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine:1: 2101us: HtmlParse::SanityCheck [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/util/google_message_handler.cc(48)] http://sirius/redmine:1: 2231us: HtmlParse::ApplyFilter:CssCombine [Wed Feb 09 20:03:20 2011] [notice] [0209/200320:INFO:net/instaweb/apache/serf_url_async_fetcher.cc(632)] Initiating async fetch for http://sirius/redmine/stylesheets/application.css?1296181549

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• Using a Dell DRAC virtual console through a NAT firewall

  - by jetboy

  I have two Dell Poweredge R210 servers, both running Ubuntu 10 Server x64. Server A has a Dell DRAC ILO card (on 172.16.96.91), and both the server and the DRAC use Server B as a gateway (with server B's WAN IP being xxx.xxx.xxx.xx). Server B uses the following NAT rules in IPTables to route traffic through to Server A's DRAC: *NAT --append PREROUTING --in-interface eth1 --protocol tcp --destination xxx.xxx.xxx.xx --destination-port 8019 --jump DNAT --to-destination 172.16.96.91:443 --append POSTROUTING --out-interface eth1 --jump SNAT --to-source xxx.xxx.xxx.xx This works fine for accessing Server A's DRAC via Server B, apart from the Java virtual console. This fails with the following error: com.sun.deploy.net.FailedDownloadException: Unable to load resource: https://xxx.xxx.xxx.xx:443/software/avctKVM.jar at com.sun.deploy.net.DownloadEngine.actionDownload(Unknown Source) etc. I know that the Java console uses port 5900, and possibly ports 83 and 5891. Can anyone help me in getting this working?

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• Installing AJAX Control Toolkit 4 in Visual Studio 2010

  - by Yousef_Jadallah

    In this tutorial I’ll show you how to install AJAX Control toolkit step by step: You can download AJAX Toolkit .NET 4 “Apr 12 2010” released before 4 days, from http://ajaxcontroltoolkit.codeplex.com/releases/view/43475#DownloadId=116534, Once downloaded, extract AjaxControlToolkit.Binary.NET4  on your computer, then extract AjaxControlToolkitSampleSite. after that you need to open Visual Studio 2010, So we will add the toolkit to the toolbox. To do that press right-click in an empty space on your toolbox, then choose Add Tab.     You can rename the new tab to be “Ajax Toolkit” for example : Then when it is added, right-click under the tab and select Choose Items: When the dialog box appears Choose .NET Framework Components tab then click Browse button and find  AjaxControlToolkit folder that you installed the  AJAX Control Toolkit. In that directory you will find a sub-directory called AjaxControlToolkitSampleSite, and under that folder you will find bin Folder, in this folder choose AjaxControlToolkit.DLL which 5.59 MB.   The result of these steps, Visual Studio will load all the controls from the DLL file and by default it will be checked in this list:   To submit your steps press OK button.   Ultimately,you can find the components in your Toolbox and you can use it.     Happy programming!

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• Adding a hyperlink in a client report definition file (RDLC)

  - by rajbk

  This post shows you how to add a hyperlink to your RDLC report. In a previous post, I showed you how to create an RDLC report. We have been given the requirement to the report we created earlier, the Northwind Product report, to add a column that will contain hyperlinks which are unique per row.  The URLs will be RESTful with the ProductID at the end. Clicking on the URL will take them to a website like so: http://localhost/products/3  where 3 is the primary key of the product row clicked on. To start off, open the RDLC and add a new column to the product table.   Add text to the header (Details) and row (Product Website). Right click on the row (not header) and select “TextBox properties” Select Action – Go to URL. You could hard code a URL here but what we need is a URL that changes based on the ProductID.   Click on the expression button (fx) The expression builder gives you access to several functions and constants including the fields in your dataset. See this reference for more details: Common Expressions for ReportViewer Reports. Add the following expression: = "http://localhost/products/" & Fields!ProductID.Value Click OK to exit the Expression Builder. The report will not render because hyperlinks are disabled by default in the ReportViewer control. To enable it, add the following in your page load event (where rvProducts is the ID of your ReportViewerControl): protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { rvProducts.LocalReport.EnableHyperlinks = true; } } We want our links to open in a new window so set the HyperLinkTarget property of the ReportViewer control to “_blank”   We are done adding hyperlinks to our report. Clicking on the links for each product pops open a new windows. The URL has the ProductID added at the end. Enjoy!

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• Unable to install Windows 2008R2 x64 on HP ProLiant ML 150 G6 with Smart Array B110i

  - by lrosa

  I am installing Windows 2008 R2 x64 (Microsoft OEM version) on a ProLint ML 150 with Smart Array B110i controller. I load the B110i drivers from a USB thumbdrive, Windows Setup can create, delete and format correctly the partitions on the raidset, but when I exit the disk manager to start setup, Windows says that he cannot find a primary partition to install Windows. The EasySetup disk provided with the system does not support Windows 2008 R2 x64 Microsoft OEM. I downloaded the latest version of EasySetup from HP website, but does not support Windows 2008 R2 x64 Microsoft OEM. Any suggestion?

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• Installing Ubuntu on an Asus Vivotab Smart Windows 8 32-bit processor tablet

  - by Ikenna

  Good day, I just got an Asus Vivotab Smart with Windows 8 but the processor is actually a 32-bit type. I am kinda confused with the Ubuntu version to install (32-bit or 64-bit). I have read all the tips and guidelines on installing Ubuntu on a Windows 8 machine. I have disabled fast boot, quiet boot, secure boot, and still cannot boot from the usb. I tried this with Ubuntu 12.04.2, 12.10, and 13.04 (the 64-bit versions only). I am yet to try a 32-bit version but I'm reluctant since Canonical says only the 64-bit version was developed to handle the Windows 8 UEFI issues. Also, I have a boot-override field in my UEFI options which I think force-boots from the boot option one selects. I selected to force-boot from my pendrive containing Ubuntu, but the screen just blinks momentarily and nothing happens. Please help me to figure out how to load ubuntu on my machine. I don't really want the Windows 8......just Ubuntu on my tablet. Thank you.

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• Illustrator CS4: SVG Export error "Transforms are Expanded"??

  - by neezer

  I get the following error when trying to save my image to SVG (via "Save Copy As"): Transforms are expanded. When I try to load the SVG in another program, all I get is a blank canvas. I ultimately want the path data to feed into RaphaelJS, but the path data that I got by clicking on the Show Code button during the SVG export also yields a blank canvas with RaphaelJS (and I've verified that RaphaelJS is loaded, and it is rendering properly). I'm convinced that this export error in Illustrator is the problem, but I can't figure out how to make it go away and export my SVG graphic properly. Can anyone help? Thanks!

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