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• What are the signs that a ten days debugging session will not resolve an issue? [on hold]

  - by smonff

  Ten days ago, we fixed a bug on a large application and the hot fix has created a disappearing of some data from the user point of view (side effect). Data are not deleted, but have been set to hidden status. It could be possible to get the data back, but the thing seems to be hard: we've already spent 10 days to understand and reproduce the problem (mostly with SQL queries but sometimes it is necessary to update the database to test the application logic). My questions are : is 10 days a normal amount of time for these kind of problems? should we keep on and retrieve the data or should we give up this work (so the customer-relationship person will tell these users sorry for the loss, but your data have disappeared or maybe tell nothing at all)? what can be the signs that shows that we should stop to search for how to solve this issue? Edit about the context : we are a small team(3), users are not the customers, and lost data are not about the users money, bank or vital data. This is a question from a confused developer about development methodologies and business concerns, not about how we should deal with the customers.

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• Four Words That Go Together Well: Oracle. Technology. Network. Lounge.

  - by Oracle OpenWorld Blog Team

  Again this year the Oracle Technology Network (OTN) Lounge will be in the Howard Street Tent, on Howard Street (surprise!) between Moscone North and South. The OTN Lounge is a central meeting place for all Oracle OpenWorld and JavaOne attendees to network with Oracle experts, ACEs, and peers. And to discuss areas of common technology interest - or discuss anything at all. Check out this OTN blog post to get the details on exciting special activities, drawings, and contests happening at the lounge the week of the conference. Stop by - there could be a t-shirt in it for you. OTN Lounge Hours Sunday, September 30    7:00 p.m. - 8:30 p.m.Monday, October 1          8:00 a.m. - 7:00 p.m.Tuesday, October 2         8:00 a.m. - 7:00 p.m.Wednesday, October 3    8:00 a.m. - 5:00 p.m.Thursday, October 4        8:00 a.m. - 2:00 p.m.

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• Ubuntu 12.10 Quantal Quetzal and AMD 12.11 Beta Driver

  - by White

  I'm using a Quantal AMDx64 install and a XFX Radeon HD5850 video card. I first enabled restricted drivers through additional drivers, but it resulted in breaking Unity and Compiz (I can only see my wallpaper and shortcuts. But the terminal still works and Nautilus too, however, without Close/Maximize/Minimize and slower). Then I uninstalled it and everything went back to normal. Then I installed it via terminal (12.10 version), and the result was the same. Then I downloaded it via ATI's web site (12.11 beta) and installed the .run file using the terminal, but the result was yet again the same. Then I went to the terminal and entered these commands: sudo apt-get remove --purge fglrx fglrx_* fglrx-amdcccle* fglrx-dev* - It said it had nothing to uninstall sudo rm /ect/x11/xorg.conf - No such directory sudo dpkg-reconfigure xserver-xorg sudo startx sudo cp/ect/x11/xorg.conf.orig /ect/x11/xorg.conf - Also, no such directory sudo aticonfig --initial sudo reboot Then, I was presented with the log in screen, but when I tried to login (with my account), it flashed a black screen and then threw me back. Guest account still works (without unity and compiz, tough) and I can still use TTY. And I also got the "AMD Testing Only" watermark. Then I figured that I should stop messing with the terminal and get help before I unleashed Apocalypse XD. Side notes: My Ubuntu is installed on a ext4 partition with 60GB, and I dual boot with Windows 7 (at least for now). My internet is a 50kbps 3G-ish, so downloading even small files is a pain, let alone a video driver. I would rather not reinstall the O.S., it was a herculean task to download everything I had in there, and I have very little free disk space for backups. I'm still new to Ubuntu (I know some basic commands), and I don't know how to debug, so please, be patient XD And using Windows, my internet is even slower (is that possible?), so it kind of leaves a torture aftertaste xD. So, if you guys could answer quickly, it would be greatly appreciated. Thanks in advance. If you need any info, just ask (and explain how to get it XD).

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• How to prevent computer from automatically sleeping and/or hibernating?

  - by mehaase

  I'm running Ubuntu 12.04, and my laptop* won't wake from sleep/suspend/hibernate. (Is sleep the same thing as suspend?) I'm not even sure which of these things it's doing. When I am done working for the day, I lock my screen (Control-Alt-L). When I come back the next day, the screen is in power saving mode, and no amount of typing or clicking (on the usb keyboard/mouse or the builtin keyboard/trackpad) nor tapping the power button will bring it back to life. The only way I can get my machine to work is to hold down the power button until it shuts off, then press the power button again to turn it back on. Obviously, anything I had open from the previous day is pretty much gone -- in particular, my VMs all get rudely shut down without any warning. This is driving me INSANE. I spend the first hour of every work day trying to figure out how to get my computer to stop locking up over night. What I've tried: Editing the org.freedesktop.upower.policy to disable suspend and hibernate. Setting power management options in "Power" section of "System Settings". Looking at all power management options in the BIOS (none appear to be relevant to sleep/suspend/hibernate). Reading every forum post/askubuntu post that I can find that's even tangentially related to the subject. My question: how to disable the automatic sleep and/or hibernate (and/or anything similar) in Ubuntu 12.04. I don't care if it's still possible to sleep/suspend/hibernate/whatever by pushing buttons or running some command or reciting led zeppelin lyrics backwards. I just want my laptop to be ready for work in the morning. *The laptop is a Dell Latitude something or other. I don't want to get too specific because I've seen a lot of similar questions get closed for being too specific. I think my question is generic enough to stand -- it's a question about the latest, stable version of Ubuntu.

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• How to handle notifications to several partial views of the same model?

  - by Seki

  I am working on refactoring an old simulation of a Turing machine. The application uses a class that contains the state and the logic of program execution, and several panels to display the tape representation and show the state, messages, and the GUI controls (start, stop, program listing, ...). I would like to refactor it using the MVC architecture that was not used originaly: the Frame is the only way to get access to the different panels and there is also a strong coupling between the "engine" class and the GUI updates in the way of frame.displayPanel.state.setText("halted"); or frame.outputPanel.messages.append("some thing"); It looks to me that I should put the state related code into an observable model class and make the different panels observers. My problem is that the java Observable class only provides a global notification to the Observers, while I would prefer not to refresh every Observers everytime, but only when the part that specificaly observe has changed. I am thinking of implementing myself several vectors of listeners (for the state / position, for the output messages, ...) but I feel like reinventing the wheel. I though also about adding some flags that the observers could check like isNewMessageAvailable(), hasTapeMoved(), etc but it sounds also approximative design. BTW, is it ok to keep the fetch / execute loop into the model or should I move it in another place? We can think in a theorical ideal way as I am completely revamping this small application.

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• Ubuntu 12.04 "stuttering"

  - by Totte

  When I log in to the desktop Ubuntu seems to "stutter". Doing pretty much anything causes the cursor to freeze for a few seconds, and the rest of the screen updates something like every 15 seconds (during these 15 seconds I can still move the cursor). For example, opening the home folder I first see no effect, followed by a semi-transparent home folder, and finally the folder as it should be (this can take like 30 seconds); no animation, just three individual frames. Also, I sometimes don't see a window for a program, even though the program in question is supposed to be "up". Since this is my first experience of Linux, I confess I have no idea where to start - searching the web I only found problems with complete freezes/crashes requiring rebooting, as opposed to this "stuttering". I installed Ubuntu 12.04 32bit from a bootable USB stick a couple of days ago, right after a fresh Vista 32bit install. Thinking the stuttering might stop if I updated Ubuntu, I managed to install approx 270 updates through the Update Manager, but the stuttering was still there. Apart from the updates, I haven't installed any software other than what was included on the bootable USB stick. Vista and Ubuntu are on a single Crucial m4 SSD, in a dual-boot setup, with GRUB. CPU: Intel Core 2 Quad Q6600 GPU: Nvidia GeForce 8800 GTX (with the recommended proprietary drivers) RAM: 2GB DDR2

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• SQL 2008/2005 Hosting :: Error - “Named Pipes Provider, error: 40 – Could not open a connection to SQL Server”

  - by mbridge

  When setting up a Microsoft Windows Server 2008 system, I went through the motions to set up IIS, MS SQL Server 2008, and Visual Studio 2010 to use as a test-bed. One of the immediate benefits of setting up such a system is that most development can be done remotely: MS SQL Server Management Studio, Visual Studio’s Web development suite, as well as file shares, remote desktop, etc, make for a great way to remotely develop in ‘pristine’ conditions. But there are drawbacks, too, such as needing to deal with firewall issues, not being able to penetrate past a router or the requirement of setting up a VPN. One of the problems I encountered when trying to remote into the MS SQL Server 2008 that I’d set up was the following error: Named Pipes Provider, error: 40 – Could not open a connection to SQL Server I followed the below steps, and was able to connect to the server after just a few moments of tinkering: 1. From the server in question, surf to this Microsoft article, and download and install the Firewall rules modification program. Never drop your firewall, even on a development machine, unless you have a really good reason to. 2. Launch SQL Server Configuration Manager. Navigate to SQL Server Network Configuration, then Protocols for your server name. Enable TCP/IP and Named Pipes by right-clicking and choosing Enable for each given Protocol Name. 3. Restart the SQL Server service from Services (or from command line, subsequently run “net stop mssqlserver” then “net start mssqlserver”. 4. Try your remote connection once more, and you should be able to connect. It’s not a terribly difficult concept, but one of the more challenging tasks developers face is dealing with environment setup. And while there is a certain blurred-line overlap between software development and server administration, sometimes the latter is daunting, especially given that you might set up only a handful of servers during your career.

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• Can I install Ubuntu 13.10 without the internet?

  - by user1526570

  I'm new to Ubuntu and Linux in general. I'm currently out of town and the dorm I am living in has terrible internet connection. It won't be another 2-3 weeks before I can go home and have proper internet connection. So my question is whether or not I can install Ubuntu 13.10 in my laptop without the internet and then do the updates once I go home? Also, I'm attempting to do a dual boot with my Lenovo G505s which was pre-installed with Windows 8. Hopefully I can pull this off. I already did the necessary things (I think and hope so) prior to installation: Disable secure boot Enable legacy and boot UEFI first Create partition Put installer in my pen drive As I am quite new to this, any advice would be of great help. Thanks in advance! EDIT: I tried yesterday. The installation asked me to connect to the internet, so I used my crappy dorm internet. When it reached the downloading/installtion of Ubuntu One, it just stopped and went on forever. So I had to stop it.

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• Mouse works only in some applications

  - by Zbee

  Recently my mouse has been buggy (actually one of the reasons I'm switching from Windows 8.1) (I say mouse, but I mean mice, I've tried several). It will work just fine, but when I try to click in the unity launcher to switch to a program such as Terminal it won't work. If I then use alt+tab to switch to Terminal I cannot click in the still-exposed Firefox to switch to that, AND it will change the mouse cursor to show things in Firefox as if I was still focused on the window (show the hand when hovering over a link). But if I then try to type in Firefox, thinking Terminal is now just shown over all windows, it types in Terminal. In Windows 8.1 I had a similar problem, I would run a program, but would only be able to use my mouse in it to click and right-click and everything for about 20 seconds before it would stop responding. NOTE: my mouse still moves around, I just can't click and sometimes it won't even register as hovering over something. I'm currently on Ubuntu 14.04 and the other OS is Windows 8.1. Any help is appreciated, Ethan

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• My computer is broken after recent update attempt to 14.04

  - by user317550

  So it all started on a day much like today, because it is today but that's not the point, when I got a notification telling me I haven't upgraded to 14.04. Not due to lack of trying, however. It offered to upgrade me itself. Now keep in mind, I've tried very hard to upgrade my is from 12.04 to 14.04. Many times, I believe, due to tinkering where there shouldn't be tinkering, my BIOS are messed up. So upgrading is essentially impossible, but I wasn't about to stop it from updating for me, thinking it didn't have too much to do with BIOS as it doesn't reboot until after. So I let it go about its business and some time later I look back at it, and my unity sidebar is gone, and anytime there's text on screen it shows as those box things. The real bottom line is that I want to know my options. All of them. I would love to be able to keep the stuff on my hard drive so a hard drive swap may be an option if you guys say that would work. I just need my computer back. Let me know if I left anything out. Peace! B^)

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• How to fix basicHttpBinding in WCF when using multiple proxy clients?

  - by Hemant

  [Question seems a little long but please have patience. It has sample source to explain the problem.] Consider following code which is essentially a WCF host: [ServiceContract (Namespace = "http://www.mightycalc.com")] interface ICalculator { [OperationContract] int Add (int aNum1, int aNum2); } [ServiceBehavior (InstanceContextMode = InstanceContextMode.PerCall)] class Calculator: ICalculator { public int Add (int aNum1, int aNum2) { Thread.Sleep (2000); //Simulate a lengthy operation return aNum1 + aNum2; } } class Program { static void Main (string[] args) { try { using (var serviceHost = new ServiceHost (typeof (Calculator))) { var httpBinding = new BasicHttpBinding (BasicHttpSecurityMode.None); serviceHost.AddServiceEndpoint (typeof (ICalculator), httpBinding, "http://172.16.9.191:2221/calc"); serviceHost.Open (); Console.WriteLine ("Service is running. ENJOY!!!"); Console.WriteLine ("Type 'stop' and hit enter to stop the service."); Console.ReadLine (); if (serviceHost.State == CommunicationState.Opened) serviceHost.Close (); } } catch (Exception e) { Console.WriteLine (e); Console.ReadLine (); } } } Also the WCF client program is: class Program { static int COUNT = 0; static Timer timer = null; static void Main (string[] args) { var threads = new Thread[10]; for (int i = 0; i < threads.Length; i++) { threads[i] = new Thread (Calculate); threads[i].Start (null); } timer = new Timer (o => Console.WriteLine ("Count: {0}", COUNT), null, 1000, 1000); Console.ReadLine (); timer.Dispose (); } static void Calculate (object state) { var c = new CalculatorClient ("BasicHttpBinding_ICalculator"); c.Open (); while (true) { try { var sum = c.Add (2, 3); Interlocked.Increment (ref COUNT); } catch (Exception ex) { Console.WriteLine ("Error on thread {0}: {1}", Thread.CurrentThread.Name, ex.GetType ()); break; } } c.Close (); } } Basically, I am creating 10 proxy clients and then repeatedly calling Add service method on separate threads. Now if I run both applications and observe opened TCP connections using netstat, I find that: If both client and server are running on same machine, number of tcp connections are equal to number of proxy objects. It means all requests are being served in parallel. Which is good. If I run server on a separate machine, I observed that maximum 2 TCP connections are opened regardless of the number of proxy objects I create. Only 2 requests run in parallel. It hurts the processing speed badly. If I switch to net.tcp binding, everything works fine (a separate TCP connection for each proxy object even if they are running on different machines). I am very confused and unable to make the basicHttpBinding use more TCP connections. I know it is a long question, but please help!

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• Why the cucumber features keeps running even though it fails?

  - by Millisami

  Its a rails 2.3.5 app. I'm using the rspec and cucumber for testing. When I run autospec, it runs correctly with the warning (Not running features. To run features in autotest, set AUTOFEATURE=true.) as below: [~/rails_apps/automation (campaign)?] ? autospec (Not running features. To run features in autotest, set AUTOFEATURE=true.) (Not running features. To run features in autotest, set AUTOFEATURE=true.) loading autotest/rails_rspec /home/millisami/.rvm/rubies/ree-1.8.7-2010.01/lib/ruby/1.8/pathname.rb:263: warning: `*' interpreted as argument prefix /home/millisami/.rvm/rubies/ree-1.8.7-2010.01/bin/ruby /home/millisami/.rvm/gems/ree-1.8.7-2010.01/gems/rspec-1.3.0/bin/spec --autospec /home/millisami/rails_apps/automation/spec/controllers/campaigns_controller_spec.rb /home/millisami/rails_apps/automation/spec/models/board_spec.rb /home/millisami/rails_apps/automation/spec/models/user_spec.rb /home/millisami/rails_apps/automation/spec/models/campaign_spec.rb /home/millisami/rails_apps/automation/spec/controllers/outlets_controller_spec.rb /home/millisami/rails_apps/automation/spec/controllers/boards_controller_spec.rb /home/millisami/rails_apps/automation/spec/models/outlet_type_spec.rb /home/millisami/rails_apps/automation/spec/models/vendor_spec.rb /home/millisami/rails_apps/automation/spec/controllers/brands_controller_spec.rb /home/millisami/rails_apps/automation/spec/controllers/vendors_controller_spec.rb /home/millisami/rails_apps/automation/spec/controllers/dashboard_controller_spec.rb /home/millisami/rails_apps/automation/spec/models/brand_spec.rb /home/millisami/rails_apps/automation/spec/helpers/dashboard_helper_spec.rb /home/millisami/rails_apps/automation/spec/models/outlet_spec.rb /home/millisami/rails_apps/automation/spec/models/client_spec.rb /home/millisami/rails_apps/automation/spec/controllers/clients_controller_spec.rb -O spec/spec.opts Now, as it suggests, when I run AUTOFEATURE=true autospec, the specs runs and the cuke features as well. But the problem is that it won't stop. It runs the features and runs them again and again in a loop. It doesn't stop after it fails. Is this due to the warning Warning: $KCODE is NONE as shown below?? [~/rails_apps/automation (campaign)?] ? AUTOFEATURE=true autospec loading autotest/cucumber_rails_rspec Warning: $KCODE is NONE. /home/millisami/.rvm/gems/ree-1.8.7-2010.01/gems/treetop-1.4.5/lib/treetop/ruby_extensions/string.rb:31: warning: method redefined; discarding old indent /home/millisami/.rvm/rubies/ree-1.8.7-2010.01/lib/ruby/1.8/pathname.rb:263: warning: `*' interpreted as argument prefix /home/millisami/.rvm/gems/ree-1.8.7-2010.01/gems/activesupport-2.3.5/lib/active_support/core_ext/object/blank.rb:49: warning: method redefined; discarding old blank? /home/millisami/.rvm/rubies/ree-1.8.7-2010.01/bin/ruby /home/millisami/.rvm/gems/ree-1.8.7-2010.01/gems/rspec-1.3.0/bin/spec --autospec /home/millisami/rails_apps/automation/spec/controllers/campaigns_controller_spec.rb /home/millisami/rails_apps/automation/spec/models/board_spec.rb /home/millisami/rails_apps/automation/spec/models/user_spec.rb /home/millisami/rails_apps/automation/spec/models/campaign_spec.rb /home/millisami/rails_apps/automation/spec/controllers/outlets_controller_spec.rb /home/millisami/rails_apps/automation/spec/controllers/boards_controller_spec.rb /home/millisami/rails_apps/automation/spec/models/outlet_type_spec.rb /home/millisami/rails_apps/automation/spec/models/vendor_spec.rb /home/millisami/rails_apps/automation/spec/controllers/brands_controller_spec.rb /home/millisami/rails_apps/automation/spec/controllers/vendors_controller_spec.rb /home/millisami/rails_apps/automation/spec/controllers/dashboard_controller_spec.rb /home/millisami/rails_apps/automation/spec/models/brand_spec.rb /home/millisami/rails_apps/automation/spec/helpers/dashboard_helper_spec.rb /home/millisami/rails_apps/automation/spec/models/outlet_spec.rb /home/millisami/rails_apps/automation/spec/models/client_spec.rb /home/millisami/rails_apps/automation/spec/controllers/clients_controller_spec.rb -O spec/spec.opts

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• C# powershell output reader iterator getting modified when pipeline closed and disposed.

  - by scope-creep

  Hello, I'm calling a powershell script from C#. The script is pretty small and is "gps;$host.SetShouldExit(9)", which list process, and then send back an exit code to be captured by the PSHost object. The problem I have is when the pipeline has been stopped and disposed, the output reader PSHost collection still seems to be written to, and is filling up. So when I try and copy it to my own output object, it craps out with a OutOfMemoryException when I try to iterate over it. Sometimes it will except with a Collection was modified message. Here is the code. private void ProcessAndExecuteBlock(ScriptBlock Block) { Collection<PSObject> PSCollection = new Collection<PSObject>(); Collection<Object> PSErrorCollection = new Collection<Object>(); Boolean Error = false; int ExitCode=0; //Send for exection. ExecuteScript(Block.Script); // Process the waithandles. while (PExecutor.PLine.PipelineStateInfo.State == PipelineState.Running) { // Wait for either error or data waithandle. switch (WaitHandle.WaitAny(PExecutor.Hand)) { // Data case 0: Collection<PSObject> data = PExecutor.PLine.Output.NonBlockingRead(); if (data.Count > 0) { for (int cnt = 0; cnt <= (data.Count-1); cnt++) { PSCollection.Add(data[cnt]); } } // Check to see if the pipeline has been closed. if (PExecutor.PLine.Output.EndOfPipeline) { // Bring back the exit code. ExitCode = RHost.ExitCode; } break; case 1: Collection<object> Errordata = PExecutor.PLine.Error.NonBlockingRead(); if (Errordata.Count > 0) { Error = true; for (int count = 0; count <= (Errordata.Count - 1); count++) { PSErrorCollection.Add(Errordata[count]); } } break; } } PExecutor.Stop(); // Create the Execution Return block ExecutionResults ER = new ExecutionResults(Block.RuleGuid,Block.SubRuleGuid, Block.MessageIdentfier); ER.ExitCode = ExitCode; // Add in the data results. lock (ReadSync) { if (PSCollection.Count > 0) { ER.DataAdd(PSCollection); } } // Add in the error data if any. if (Error) { if (PSErrorCollection.Count > 0) { ER.ErrorAdd(PSErrorCollection); } else { ER.InError = true; } } // We have finished, so enque the block back. EnQueueOutput(ER); } and this is the PipelineExecutor class which setups the pipeline for execution. public class PipelineExecutor { private Pipeline pipeline; private WaitHandle[] Handles; public Pipeline PLine { get { return pipeline; } } public WaitHandle[] Hand { get { return Handles; } } public PipelineExecutor(Runspace runSpace, string command) { pipeline = runSpace.CreatePipeline(command); Handles = new WaitHandle[2]; Handles[0] = pipeline.Output.WaitHandle; Handles[1] = pipeline.Error.WaitHandle; } public void Start() { if (pipeline.PipelineStateInfo.State == PipelineState.NotStarted) { pipeline.Input.Close(); pipeline.InvokeAsync(); } } public void Stop() { pipeline.StopAsync(); } } An this is the DataAdd method, where the exception arises. public void DataAdd(Collection<PSObject> Data) { foreach (PSObject Ps in Data) { Data.Add(Ps); } } I put a for loop around the Data.Add, and the Collection filled up with 600k+ so feels like the gps command is still running, but why. Any ideas. Thanks in advance.

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• terminating java applet thread on page unload

  - by Hammad Tariq

  Hello, I have got a problem here in terminating the threads. The problem is that I am using applet thread to access JS DOM and manipulate innerHTML of a span to right the Thread Name as the innerHTML. It works fine until I keep refreshing the page but if I dont give it a sleep of like 200ms and go to another page which dont have any applet on it, it will give me an error in firebug console: document.getElementById("userName") is null What I am suspecting is, although I send an interrupt on stop and I have also tried the same by setting a flag variable of running in run while loop, the thread executes much faster than the time JVM takes to unload it and I get my page changed in browser but applet is still trying to find an element with id userName. Is that true? Is there any work around of it? Is there any way to know how many threads are running at the moment? Is there any kill all command to send on destroy()? I have searched a lot, seen all the API of java threads and applets, couldn't get this to work. Below is the code: import java.applet.Applet; import netscape.javascript.*; //No need to extend JApplet, since we don't add any components; //we just paint. public class firstApplet extends Applet { /** * */ private static final long serialVersionUID = 1L; firstThread first; boolean running = false; public class firstThread extends Thread{ JSObject win; JSObject doc; firstThread second; public firstThread(JSObject window){ this.win = window; } public void run() { try{ System.out.println("running... "); while (!isInterrupted()){ doc = (JSObject) win.getMember("document"); String userName = Thread.currentThread().getName(); //String userName = "John Doe"; String S = "document.getElementById(\"userName\").innerHTML = \""+userName+"\";"; doc.eval(S); Thread.sleep(5); } }catch(Exception e){ System.out.println("exception in first thread... "); e.printStackTrace(); } } } public void init() { System.out.println("initializing... "); } public void start() { System.out.println("starting... "); JSObject window = JSObject.getWindow(this); first = new firstThread(window); first.start(); running = true; } public void stop() { first.interrupt(); first = null; System.out.println("stopping... "); } public void destroy() { if(first != null){ first = null; } System.out.println("preparing for unloading..."); } } Thanks

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• How do I use MediaRecorder to record video without causing a segmentation fault?

  - by rabidsnail

  I'm trying to use android.media.MediaRecorder to record video, and no matter what I do the android runtime segmentation faults when I call prepare(). Here's an example: public void onCreate(Bundle savedInstanceState) { Log.i("video test", "making recorder"); MediaRecorder recorder = new MediaRecorder(); contentResolver = getContentResolver(); try { super.onCreate(savedInstanceState); Log.i("video test", "--------------START----------------"); SurfaceView target_view = new SurfaceView(this); Log.i("video test", "making surface"); Surface target = target_view.getHolder().getSurface(); Log.i("video test", target.toString()); Log.i("video test", "new recorder"); recorder = new MediaRecorder(); Log.i("video test", "set display"); recorder.setPreviewDisplay(target); Log.i("video test", "pushing surface"); setContentView(target_view); Log.i("video test", "set audio source"); recorder.setAudioSource(MediaRecorder.AudioSource.MIC); Log.i("video test", "set video source"); recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT); Log.i("video test", "set output format"); recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); Log.i("video test", "set audio encoder"); recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); Log.i("video test", "set video encoder"); recorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP); Log.i("video test", "set max duration"); recorder.setMaxDuration(3600); Log.i("video test", "set on info listener"); recorder.setOnInfoListener(new listener()); Log.i("video test", "set video size"); recorder.setVideoSize(320, 240); Log.i("video test", "set video frame rate"); recorder.setVideoFrameRate(15); Log.i("video test", "set output file"); recorder.setOutputFile(get_path(this, "foo.3gp")); Log.i("video test", "prepare"); recorder.prepare(); Log.i("video test", "start"); recorder.start(); Log.i("video test", "sleep"); Thread.sleep(3600); Log.i("video test", "stop"); recorder.stop(); Log.i("video test", "release"); recorder.release(); Log.i("video test", "-----------------SUCCESS------------------"); finish(); } catch (Exception e) { Log.i("video test", e.toString()); recorder.reset(); recorder.release(); Log.i("video tets", "-------------------FAIL-------------------"); finish(); } } public static String get_path (Context context, String fname) { String path = context.getFileStreamPath("foo").getParentFile().getAbsolutePath(); String res = path+"/"+fname; Log.i("video test", "path: "+res); return res; } class listener implements MediaRecorder.OnInfoListener { public void onInfo(MediaRecorder recorder, int what, int extra) { Log.i("video test", "Video Info: "+what+", "+extra); } }

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• Perf4j Not Logging Correctly

  - by Jehud

  I setup some stop watch calls in my code to measure some code blocks and all the messages are going into my primary log and not into the timing log. The perfStats.log file gets created just fine but all the messages go to the root log which I didn't think was supposed to happen according to the docs I've read. Is there something obvious I'm missing here? perf4j tutorial link: http://perf4j.codehaus.org/devguide.html#Using_the_log4j_Appenders_to_Generate_Real-Time_Performance_Information Example code import org.apache.log4j.Logger; import org.perf4j.LoggingStopWatch; import org.perf4j.StopWatch; public class PerfLogger { /** * @param args */ public static void main(String[] args) { Logger logger = Logger.getLogger(PerfLogger.class.getName()); logger.info("Starting perf log test"); StopWatch stopWatch = new LoggingStopWatch("test time"); try { Thread.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } stopWatch.stop(); } } Example log4j.xml <log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'> <appender name="STDOUT-DEBUG" class="org.apache.log4j.ConsoleAppender"> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d %-5p [%t]%x %M (%F:%L) - %m%n"/> </layout> </appender> <!-- Perf4J appenders --> <!-- This AsyncCoalescingStatisticsAppender groups StopWatch log messages into GroupedTimingStatistics messages which it sends on the file appender defined below --> <appender name="CoalescingStatistics" class="org.perf4j.log4j.AsyncCoalescingStatisticsAppender"> <!-- The TimeSlice option is used to determine the time window for which all received StopWatch logs are aggregated to create a single GroupedTimingStatistics log. Here we set it to 10 seconds, overriding the default of 30000 ms --> <param name="TimeSlice" value="10000"/> <appender-ref ref="fileAppender"/> </appender> <!-- This file appender is used to output aggregated performance statistics --> <appender name="fileAppender" class="org.apache.log4j.FileAppender"> <param name="File" value="perfStats.log"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%m%n"/> </layout> </appender> <!-- Loggers --> <!-- The Perf4J logger. Note that org.perf4j.TimingLogger is the value of the org.perf4j.StopWatch.DEFAULT_LOGGER_NAME constant. Also, note that additivity is set to false, which is usually what is desired - this means that timing statements will only be sent to this logger and NOT to upstream loggers. --> <logger name="org.perf4j.TimingLogger" additivity="false"> <level value="INFO"/> <appender-ref ref="CoalescingStatistics"/> </logger> <root> <priority value="info"/> <appender-ref ref="STDOUT-DEBUG"/> </root> </log4j:configuration>

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• Jumbled byte array after using TcpClient and TcpListener

  - by Dylan

  I want to use the TcpClient and TcpListener to send an mp3 file over a network. I implemented a solution of this using sockets, but there were some issues so I am investigating a new/better way to send a file. I create a byte array which looks like this: length_of_filename|filename|file This should then be transmitted using the above mentioned classes, yet on the server side the byte array I read is completely messed up and I'm not sure why. The method I use to send: public static void Send(String filePath) { try { IPEndPoint endPoint = new IPEndPoint(Settings.IpAddress, Settings.Port + 1); Byte[] fileData = File.ReadAllBytes(filePath); FileInfo fi = new FileInfo(filePath); List<byte> dataToSend = new List<byte>(); dataToSend.AddRange(BitConverter.GetBytes(Encoding.Unicode.GetByteCount(fi.Name))); // length of filename dataToSend.AddRange(Encoding.Unicode.GetBytes(fi.Name)); // filename dataToSend.AddRange(fileData); // file binary data using (TcpClient client = new TcpClient()) { client.Connect(Settings.IpAddress, Settings.Port + 1); // Get a client stream for reading and writing. using (NetworkStream stream = client.GetStream()) { // server is ready stream.Write(dataToSend.ToArray(), 0, dataToSend.ToArray().Length); } } } catch (ArgumentNullException e) { Debug.WriteLine(e); } catch (SocketException e) { Debug.WriteLine(e); } } } Then on the server side it looks as follows: private void Listen() { TcpListener server = null; try { // Setup the TcpListener Int32 port = Settings.Port + 1; IPAddress localAddr = IPAddress.Parse("127.0.0.1"); // TcpListener server = new TcpListener(port); server = new TcpListener(localAddr, port); // Start listening for client requests. server.Start(); // Buffer for reading data Byte[] bytes = new Byte[1024]; List<byte> data; // Enter the listening loop. while (true) { Debug.WriteLine("Waiting for a connection... "); string filePath = string.Empty; // Perform a blocking call to accept requests. // You could also user server.AcceptSocket() here. using (TcpClient client = server.AcceptTcpClient()) { Debug.WriteLine("Connected to client!"); data = new List<byte>(); // Get a stream object for reading and writing using (NetworkStream stream = client.GetStream()) { // Loop to receive all the data sent by the client. while ((stream.Read(bytes, 0, bytes.Length)) != 0) { data.AddRange(bytes); } } } int fileNameLength = BitConverter.ToInt32(data.ToArray(), 0); filePath = Encoding.Unicode.GetString(data.ToArray(), 4, fileNameLength); var binary = data.GetRange(4 + fileNameLength, data.Count - 4 - fileNameLength); Debug.WriteLine("File successfully downloaded!"); // write it to disk using (BinaryWriter writer = new BinaryWriter(File.Open(filePath, FileMode.Append))) { writer.Write(binary.ToArray(), 0, binary.Count); } } } catch (Exception ex) { Debug.WriteLine(ex); } finally { // Stop listening for new clients. server.Stop(); } } Can anyone see something that I am missing/doing wrong?

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• Need a little help with sound in a JApplet

  - by jacob schuschel

  I am working on a solitaire game in Java, and i need to implement sound when the desk is shuffled, card flipped, etc. I used the following sites as reference to try and get it to work, but i am getting Null Pointer Exceptions or mishandled URL exception (depending on what i tweak). here Also, i am using netbeans 6.7.1 as my IDE. I will try to break down the code and explain: package cardgame; import java.applet.*; import java.util.logging.Level; import java.util.logging.Logger; import javax.swing.JApplet; import javax.swing.*; import java.io.*; import java.net.*; /** * * @author jacob */ public class Sound extends JApplet { private AudioClip song; // Sound player private String URL = null; private URL songPath; // Sound path /* *sound_1 = shuffling cards *sound_2 = to discard *sound_3 = from discard *sound_4 = cardflip 1 *sound_5 = cardflip 2 */ Sound(String filename) { try { songPath = new URL(getCodeBase(),filename); // Get the Sound URL } catch (MalformedURLException ex) { Logger.getLogger(Sound.class.getName()).log(Level.SEVERE, null, ex); } song = getAudioClip(songPath); // Load the Sound } Sound(int i) { URL = "./sounds/sound_" + i + ".wav"; System.out.println(URL); try { songPath = new URL(URL); // Get the Sound URL song = getAudioClip(songPath); } catch (MalformedURLException ex) { Logger.getLogger(Sound.class.getName()).log(Level.SEVERE, null, ex); } } public void playSound() { song.loop(); // Play } public void stopSound() { song.stop(); // Stop } public void playSoundOnce() { song.play(); // Play only once } } The 2 different construcors are for different ways i tried to implement this. The first one creates the filepath, and passes it in. The second one builds the filepath in the constructor, given a sound # (i made a list of what numbers correspond to what sound for reference). I am getting the followig errors out: ./sounds/sound_1.wav Nov 16, 2009 4:14:13 PM cardgame.Sound ./sounds/sound_2.wav SEVERE: null java.net.MalformedURLException: no protocol: ./sounds/sound_1.wav ./sounds/sound_3.wav at java.net.URL.(URL.java:583) at java.net.URL.(URL.java:480) at java.net.URL.(URL.java:429) ./sounds/sound_4.wav ./sounds/sound_5.wav at cardgame.Sound.(Sound.java:46) at cardgame.Game.loadSounds(Game.java:712) at cardgame.Game.(Game.java:62) at cardgame.Main.main(Main.java:25) Nov 16, 2009 4:14:13 PM cardgame.Sound SEVERE: null java.net.MalformedURLException: no protocol: ./sounds/sound_2.wav at java.net.URL.(URL.java:583) at java.net.URL.(URL.java:480) at java.net.URL.(URL.java:429) at cardgame.Sound.(Sound.java:46) at cardgame.Game.loadSounds(Game.java:712) at cardgame.Game.(Game.java:62) at cardgame.Main.main(Main.java:25) Nov 16, 2009 4:14:13 PM cardgame.Sound SEVERE: null java.net.MalformedURLException: no protocol: ./sounds/sound_3.wav at java.net.URL.(URL.java:583) at java.net.URL.(URL.java:480) at java.net.URL.(URL.java:429) at cardgame.Sound.(Sound.java:46) at cardgame.Game.loadSounds(Game.java:712) at cardgame.Game.(Game.java:62) at cardgame.Main.main(Main.java:25) Nov 16, 2009 4:14:13 PM cardgame.Sound SEVERE: null java.net.MalformedURLException: no protocol: ./sounds/sound_4.wav at java.net.URL.(URL.java:583) at java.net.URL.(URL.java:480) at java.net.URL.(URL.java:429) at cardgame.Sound.(Sound.java:46) at cardgame.Game.loadSounds(Game.java:712) at cardgame.Game.(Game.java:62) at cardgame.Main.main(Main.java:25) Nov 16, 2009 4:14:13 PM cardgame.Sound SEVERE: null java.net.MalformedURLException: no protocol: ./sounds/sound_5.wav at java.net.URL.(URL.java:583) at java.net.URL.(URL.java:480) at java.net.URL.(URL.java:429) at cardgame.Sound.(Sound.java:46) at cardgame.Game.loadSounds(Game.java:712) at cardgame.Game.(Game.java:62) at cardgame.Main.main(Main.java:25) Thanks for those who read and more thanks to those who help. I know it is somewhat long, but i would rather get it all out there, than have 50 questions that come back or have people not answer due to lack of initial info. also only lets me post a single link right now, so the links are given below dreamincode.net/forums/showtopic14083.htm stackoverflow.com/questions/512436/java-playing-wav-sounds deitel.com/articles/java_tutorials/20060422/LoadingPlayingAudioClips/index.html

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• Interactive Data Language, IDL: Does anybody care?

  - by Alex

  Anyone use a language called Interactive Data Language, IDL? It is popular with scientists. I think it is a poor language because it is proprietary (every terminal running it has to have an expensive license purchased) and it has minimal support (try searching for IDL, the language, right now on stack) . I am trying to convince my colleagues to stop using it and learn C/C++/Python/Fortran/Java/Ruby. Does anybody know about or even care about IDL enough to have opinions on it? What do you think of it? Should I tell my colleagues to stop wasting their time on it now? How can I convince them? Edit: People are getting the impression that I don't know or use IDL. Also, I said IDL has minimal support which is true in one sense, so I must clarify that the scientific libraries are indeed large. I use IDL all the time, but this is exactly the problem: I am only using IDL because colleagues use it. There is a file format IDL uses, the .sav, which can only be opened in IDL. So I must use IDL to work with this data and transfer the data back to colleagues, but I know I would be more efficient in another language. This is like someone sending you a microsoft word file in an email attachment and if you don't understand how wrong that is then you probably write too many words not enough code and you bought microsoft word. Edit: As an alternative to IDL Python is popular. Here is a list of The Pros of IDL (and the cons) from AstroBetter: Pros of IDL Mature many numerical and astronomical libraries available Wide astronomical user base Numerical aspect well integrated with language itself Many local users with deep experience Faster for small arrays Easier installation Good, unified documentation Standard GUI run/debug tool (IDLDE) Single widget system (no angst about which to choose or learn) SAVE/RESTORE capability Use of keyword arguments as flags more convenient Cons of IDL Narrow applicability, not well suited to general programming Slower for large arrays Array functionality less powerful Table support poor Limited ability to extend using C or Fortran, such extensions hard to distribute and support Expensive, sometimes problem collaborating with others that don’t have or can’t afford licenses. Closed source (only RSI can fix bugs) Very awkward to integrate with IRAF tasks Memory management more awkward Single widget system (useless if working within another framework) Plotting: Awkward support for symbols and math text Many font systems, portability issues (v5.1 alleviates somewhat) not as flexible or as extensible plot windows not intrinsically interactive (e.g., pan & zoom) Pros of Python Very general and powerful programming language, yet easy to learn. Strong, but optional, Object Oriented programming support Very large user and developer community, very extensive and broad library base Very extensible with C, C++, or Fortran, portable distribution mechanisms available Free; non-restrictive license; Open Source Becoming the standard scripting language for astronomy Easy to use with IRAF tasks Basis of STScI application efforts More general array capabilities Faster for large arrays, better support for memory mapping Many books and on-line documentation resources available (for the language and its libraries) Better support for table structures Plotting framework (matplotlib) more extensible and general Better font support and portability (only one way to do it too) Usable within many windowing frameworks (GTK, Tk, WX, Qt…) Standard plotting functionality independent of framework used plots are embeddable within other GUIs more powerful image handling (multiple simultaneous LUTS, optional resampling/rescaling, alpha blending, etc) Support for many widget systems Strong local influence over capabilities being developed for Python Cons of Python More items to install separately Not as well accepted in astronomical community (but support clearly growing) Scientific libraries not as mature: Documentation not as complete, not as unified Not as deep in astronomical libraries and utilities Not all IDL numerical library functions have corresponding functionality in Python Some numeric constructs not quite as consistent with language (or slightly less convenient than IDL) Array indexing convention “backwards” Small array performance slower No standard GUI run/debug tool Support for many widget systems (angst regarding which to choose) Current lack of function equivalent to SAVE/RESTORE in IDL matplotlib does not yet have equivalents for all IDL 2-D plotting capability (e.g., surface plots) Use of keyword arguments used as flags less convenient Plotting: comparatively immature, still much development going on missing some plot type (e.g., surface) 3-d capability requires VTK (though matplotlib has some basic 3-d capability)

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• Overflow exception while performing parallel factorization using the .NET Task Parallel Library (TPL

  - by Aviad P.

  Hello, I'm trying to write a not so smart factorization program and trying to do it in parallel using TPL. However, after about 15 minutes of running on a core 2 duo machine, I am getting an aggregate exception with an overflow exception inside it. All the entries in the stack trace are part of the .NET framework, the overflow does not come from my code. Any help would be appreciated in figuring out why this happens. Here's the commented code, hopefully it's simple enough to understand: class Program { static List<Tuple<BigInteger, int>> factors = new List<Tuple<BigInteger, int>>(); static void Main(string[] args) { BigInteger theNumber = BigInteger.Parse( "653872562986528347561038675107510176501827650178351386656875178" + "568165317809518359617865178659815012571026531984659218451608845" + "719856107834513527"); Stopwatch sw = new Stopwatch(); bool isComposite = false; sw.Start(); do { /* Print out the number we are currently working on. */ Console.WriteLine(theNumber); /* Find a factor, stop when at least one is found (using the Any operator). */ isComposite = Range(theNumber) .AsParallel() .Any(x => CheckAndStoreFactor(theNumber, x)); /* Of the factors found, take the one with the lowest base. */ var factor = factors.OrderBy(x => x.Item1).First(); Console.WriteLine(factor); /* Divide the number by the factor. */ theNumber = BigInteger.Divide( theNumber, BigInteger.Pow(factor.Item1, factor.Item2)); /* Clear the discovered factors cache, and keep looking. */ factors.Clear(); } while (isComposite); sw.Stop(); Console.WriteLine(isComposite + " " + sw.Elapsed); } static IEnumerable<BigInteger> Range(BigInteger squareOfTarget) { BigInteger two = BigInteger.Parse("2"); BigInteger element = BigInteger.Parse("3"); while (element * element < squareOfTarget) { yield return element; element = BigInteger.Add(element, two); } } static bool CheckAndStoreFactor(BigInteger candidate, BigInteger factor) { BigInteger remainder, dividend = candidate; int exponent = 0; do { dividend = BigInteger.DivRem(dividend, factor, out remainder); if (remainder.IsZero) { exponent++; } } while (remainder.IsZero); if (exponent > 0) { lock (factors) { factors.Add(Tuple.Create(factor, exponent)); } } return exponent > 0; } } Here's the exception thrown: Unhandled Exception: System.AggregateException: One or more errors occurred. --- > System.OverflowException: Arithmetic operation resulted in an overflow. at System.Linq.Parallel.PartitionedDataSource`1.ContiguousChunkLazyEnumerator.MoveNext(T& currentElement, Int32& currentKey) at System.Linq.Parallel.AnyAllSearchOperator`1.AnyAllSearchOperatorEnumerator`1.MoveNext(Boolean& currentElement, Int32& currentKey) at System.Linq.Parallel.StopAndGoSpoolingTask`2.SpoolingWork() at System.Linq.Parallel.SpoolingTaskBase.Work() at System.Linq.Parallel.QueryTask.BaseWork(Object unused) at System.Linq.Parallel.QueryTask.<.cctor>b__0(Object o) at System.Threading.Tasks.Task.InnerInvoke() at System.Threading.Tasks.Task.Execute() --- End of inner exception stack trace --- at System.Linq.Parallel.QueryTaskGroupState.QueryEnd(Boolean userInitiatedDispose) at System.Linq.Parallel.SpoolingTask.SpoolStopAndGo[TInputOutput,TIgnoreKey](QueryTaskGroupState groupState, PartitionedStream`2 partitions, SynchronousChannel`1[] channels, TaskScheduler taskScheduler) at System.Linq.Parallel.DefaultMergeHelper`2.System.Linq.Parallel.IMergeHelper<TInputOutput>.Execute() at System.Linq.Parallel.MergeExecutor`1.Execute[TKey](PartitionedStream`2 partitions, Boolean ignoreOutput, ParallelMergeOptions options, TaskScheduler taskScheduler, Boolean isOrdered, CancellationState cancellationState, Int32 queryId) at System.Linq.Parallel.PartitionedStreamMerger`1.Receive[TKey](PartitionedStream`2 partitionedStream) at System.Linq.Parallel.AnyAllSearchOperator`1.WrapPartitionedStream[TKey](PartitionedStream`2 inputStream, IPartitionedStreamRecipient`1 recipient, BooleanpreferStriping, QuerySettings settings) at System.Linq.Parallel.UnaryQueryOperator`2.UnaryQueryOperatorResults.ChildResultsRecipient.Receive[TKey](PartitionedStream`2 inputStream) at System.Linq.Parallel.ScanQueryOperator`1.ScanEnumerableQueryOperatorResults.GivePartitionedStream(IPartitionedStreamRecipient`1 recipient) at System.Linq.Parallel.UnaryQueryOperator`2.UnaryQueryOperatorResults.GivePartitionedStream(IPartitionedStreamRecipient`1 recipient) at System.Linq.Parallel.QueryOperator`1.GetOpenedEnumerator(Nullable`1 mergeOptions, Boolean suppressOrder, Boolean forEffect, QuerySettings querySettings) at System.Linq.Parallel.QueryOpeningEnumerator`1.OpenQuery() at System.Linq.Parallel.QueryOpeningEnumerator`1.MoveNext() at System.Linq.Parallel.AnyAllSearchOperator`1.Aggregate() at System.Linq.ParallelEnumerable.Any[TSource](ParallelQuery`1 source, Func`2 predicate) at PFact.Program.Main(String[] args) in d:\myprojects\PFact\PFact\Program.cs:line 34 Any help would be appreciated. Thanks!

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• How to get IMediaControl.Run() to start a file playing with no delay

  - by MusiGenesis

  I am attempting to use DirectShow to play two AVI files consecutively (one after the other) so that there is no interruption in the audio or video when the player transitions from one file to the next. I have two custom controls on my form. Each one is pre-loaded with an AVI file, and before playback begins I set up all the DirectShow interfaces, set the video windows and resize them, call IMediaControl.Run(), then IMediaControl.Pause(), then IMediaSeeking.SetPositions to reset to frame 0, on both controls. On the form, you can see that both files are paused at their initial frames. I then call IMediaControl.Run() on the first control, and wait for it to complete before calling Run() on the second control. Initially, I hooked into the first video's EC_COMPLETE notification message, and used this to start the second. Thinking that this event might be slow to arrive (turns out it is, but for a weird reason), I tried two other approaches: Check the first video's current position inside a timer that goes off every second or so (using IMediaPosition.get_CurrentPosition). When the current position is within a second of the video's stop time (known in advance from IMediaPosition.get_StopTime), I go into a tight while loop and wait for the current position to equal the stop time, and then call Run() on the second video. Same as the first, except I replace the while loop with a call to timeSetEvent from winmm.dll, with a delay set so that it fires right when the first file is supposed to end. I use the callback to Run() the second file. Either of these two methods substantially cuts down the delay between the end of the first file and the beginning of the second, indicating that the EC_COMPLETE message doesn't arrive immediately after the file is complete (I also tried hooking the EC_SEGMENT_COMPLETE message, which is supposed to be used for looping within a file, but apparently nobody supports this - it never occurs on my machine, at least). Doing all of the above has cut the transition delay from as much as a second, down to a barely perceptible glitch; about a third of the time the files transition with no interruption at all, which suggests there's no fundamental reason I can't get this to work all the time. The slight delay is still unacceptable, unfortunately. I assume (and I could easily be wrong) that the remaining delay is due to a slight variable delay between the call to IMediaControl.Run() and when the video actually starts playing. Does anybody know anything I can do to eliminate this little lag? It would also help to be told this is fundamentally impossible for whatever reason, which wouldn't surprise me. I've never encountered a video player in Windows that doesn't have this problem, so it may not be doable. More info: the AVI files I'm playing are completely uncompressed (video and audio are uncompressed), so I don't think the lag is due to DirectShow's having to uncompress the video ahead of play start, although it may still buffer ahead as matter of course (and this may be the source of the problem). I would have though that starting play, pausing and then rewinding to the beginning would fix this. Also, the way I'm handling the transition is to actually have the second control underneath the first; when the first completes playing, I start the second and then call BringToFront on it, creating the appearance of a single video transitioning between the two originals. I don't think the glitch is due to this, because it works perfectly some of the time, and even if this were problematic, it wouldn't explain the matching audio glitch. Even more: I just tried starting the second video 30-50 milliseconds "early" and that seemed to eliminate even more of the gap, so I'm guessing that the lag in Run() is about that long. It appears to be variable, though, so this is still not where I need it to be.

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• Dependency Injection: Jetty 7

  - by Malax

  Hi StackOverflow! My application requires several interface implementations which require a Jetty server to do their job. This is, however, not necessarily the case in every implementations of those interfaces so the Jetty server is only a dependency. Since it would be a huge amount of pain to wrap the entire jetty server with all its logging, connector and Handler configurations, I want to inject the server to those implementations with Spring. I decided that injecting the Server class is not a good idea because an implementation could stop the server even if its required at another location. Currently I inject empty HandlerList classes to those implementations and they register their handlers to avoid those problems. The Problem: Those handlers might interfere with other handlers for example: implementation one might register a handler for /foo and implementation two too... problem. Has anyone used Jetty in such an environment? And how could this problem be solved? My XML to clarify my problem: <bean id="jetty" class="org.eclipse.jetty.server.Server" destroy-method="stop"> <property name="connectors"> <list> <bean class="org.eclipse.jetty.server.bio.SocketConnector"> <property name="host" value="10.8.0.46" /> <property name="port" value="9999" /> </bean> </list> </property> <property name="handler"> <bean class="org.eclipse.jetty.server.handler.HandlerCollection"> <property name="handlers"> <list> <ref bean="jetty.handlerList" /> <bean class="org.eclipse.jetty.server.handler.RequestLogHandler"> <property name="requestLog"> <bean class="org.eclipse.jetty.server.NCSARequestLog"> <constructor-arg value="${jetty.logfile}" /> <property name="extended" value="false"/> </bean> </property> </bean> </list> </property> </bean> </property> <property name="sendServerVersion" value="false" /> </bean> <bean id="jetty.handlerList" class="org.eclipse.jetty.server.handler.HandlerList" /> If I require an empty HandlerList I use something like this where com.example.myapp.util.ioc.CreateHandlerListFactory is a org.springframework.beans.factory.FactoryBean which creates a new HandlerList within the given HandlerList. <constructor-arg> <bean class="com.example.myapp.util.ioc.CreateHandlerListFactory"> <constructor-arg ref="jetty.handlerList"/> </bean> </constructor-arg>

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• Ruby Rails Mongrel Sever failing to serve OXS1.6

  - by Mark V

  Hi there I'm fairly new to Rails and the Mac, and doing my first deploy... I'm trying to set up my rails app on a brand new Apple mini-server running OXS1.6 (Snow Leopard). It is currently running fine on my new iMac i7 (same OS). I start mongrel with this command: mongrel_rails start -e production -p 3000 -d -a 127.0.0.1 --debug And it starts giving this output in the log/mongrel.log ** Daemonized, any open files are closed. Look at log/mongrel.pid and log/mongrel.log for info. ** Starting Mongrel listening at 127.0.0.1:3000 ** Installing debugging prefixed filters. Look in log/mongrel_debug for the files. ** Starting Rails with production environment... /Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/rails/gem_dependency.rb:119:Warning: Gem::Dependency#version_requirements is deprecated and will be removed on or after August 2010. Use #requirement /Users/danadmin/ServiceApp/ServiceApp/app/helpers/input_grid_manager.rb:9: warning: already initialized constant ID_PREFIX /Users/danadmin/ServiceApp/ServiceApp/app/helpers/input_grid_manager.rb:10: warning: already initialized constant ADD_ID ** Rails loaded. ** Loading any Rails specific GemPlugins ** Signals ready. TERM => stop. USR2 => restart. INT => stop (no restart). ** Rails signals registered. HUP => reload (without restart). It might not work well. ** Mongrel 1.1.5 available at 127.0.0.1:3000 ** Writing PID file to log/mongrel.pid The output is the same on my dev iMac (including the warnings). The difference is that accessing http://127.0.0.1:3000 on my iMac serves up the app's login page. Where as on the mac mini-server accessing the same results in this error 500 text from mongrel: "We're sorry, but something went wrong." It's as if rails is not working. I'm pretty good at figuring things out if I have some log file messages to direct me, but mongrel.log has no error message (the output remains the same as above), and the log/production.log is empty (which makes me think rails has not started?). My gems are all the same versions between machines and so is the app code; and there are no clues I can see in any of the mongrel_debug logs, except that rails.log on the mac mini-server and the iMac are different. After a start and single access, first is the rails.log from the mac mini-server: D, [2010-04-15T13:45:34.870406 #6914] DEBUG -- : TRACING ON Thu Apr 15 13:45:34 +1200 2010 Thu Apr 15 13:46:08 +1200 2010 REQUEST / --- !map:Mongrel::HttpParams SERVER_NAME: 127.0.0.1 HTTP_ACCEPT: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 HTTP_CACHE_CONTROL: max-age=0 HTTP_HOST: 127.0.0.1:3000 HTTP_USER_AGENT: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_0; en-US) AppleWebKit/533.2 (KHTML, like Gecko) Chrome/5.0.342.9 Safari/533.2 REQUEST_PATH: / SERVER_PROTOCOL: HTTP/1.1 HTTP_ACCEPT_LANGUAGE: en-US,en;q=0.8 REMOTE_ADDR: 127.0.0.1 PATH_INFO: / SERVER_SOFTWARE: Mongrel 1.1.5 SCRIPT_NAME: / HTTP_VERSION: HTTP/1.1 REQUEST_URI: / SERVER_PORT: "3000" HTTP_ACCEPT_CHARSET: ISO-8859-1,utf-8;q=0.7,*;q=0.3 REQUEST_METHOD: GET GATEWAY_INTERFACE: CGI/1.2 HTTP_ACCEPT_ENCODING: gzip,deflate,sdch HTTP_CONNECTION: keep-alive While on my iMac it seems the same except for the addition of the HTTP_COOKIE and the HTTP_IF_NONE_MATCH, here is rails.log from my iMac # Logfile created on Thu Apr 15 13:41:42 +1200 2010 by logger.rb/22285 D, [2010-04-15T13:41:42.934088 #2070] DEBUG -- : TRACING ON Thu Apr 15 13:41:42 +1200 2010 Thu Apr 15 13:42:05 +1200 2010 REQUEST / --- !map:Mongrel::HttpParams SERVER_NAME: 127.0.0.1 HTTP_ACCEPT: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 HTTP_HOST: 127.0.0.1:3000 HTTP_USER_AGENT: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-US) AppleWebKit/533.2 (KHTML, like Gecko) Chrome/5.0.342.9 Safari/533.2 REQUEST_PATH: / SERVER_PROTOCOL: HTTP/1.1 HTTP_IF_NONE_MATCH: "\"216cc63ce3c1f286ef8dd4f18f354f6e\"" HTTP_ACCEPT_LANGUAGE: en-US,en;q=0.8 REMOTE_ADDR: 127.0.0.1 PATH_INFO: / SERVER_SOFTWARE: Mongrel 1.1.5 SCRIPT_NAME: / HTTP_COOKIE: _ServiceApp_session=BAh7DDonY3VzdG9tZXJfbGlzdF9maWx0ZXJfam9iX3N0YXR1c19pZGn6Og9zZXNzaW9uX2lkIiU0ZTk1ZWZjMmViMGU3NjE2YzA0NDc2YTkxYzJlNDZiOToaY3VycmVudF9jdXN0b21lcl9uYW1lIilUSEUgQ1VTVE9NRVIgTkFNRSBORUVEUyBUTyBCRSBMT0FERUQ6EF9jc3JmX3Rva2VuIjFuT1JMUWk0NlZrWlM3c2lUN3BaWCs5NkhRajhxYnFwRnhzVHVTWXEvUWY0PToZam9iX2xpc3RfZmlsdGVyX3RleHQiADogam9iX2xpc3RfZmlsdGVyX2VtcGxveWVlX2lkafo6HmN1c3RvbWVyX2xpc3RfZmlsdGVyX3RleHQiAA%3D%3D--d01bc5d0b457ad524d16cb3402b5dfed9afce83d HTTP_VERSION: HTTP/1.1 REQUEST_URI: / SERVER_PORT: "3000" HTTP_ACCEPT_CHARSET: ISO-8859-1,utf-8;q=0.7,*;q=0.3 REQUEST_METHOD: GET GATEWAY_INTERFACE: CGI/1.2 HTTP_ACCEPT_ENCODING: gzip,deflate,sdch HTTP_CONNECTION: keep-alive Any direction or ideas would be greatly appreciated. Thanks.

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• WCF and Firewalls

  - by Amitd

  Hi guys, As a part of learning WCF, I was trying to use a simple WCF client-server code . http://weblogs.asp.net/ralfw/archive/2007/04/14/a-truely-simple-example-to-get-started-with-wcf.aspx but I'm facing strange issues.I was trying out the following. Client(My) IP address is : 192.168.2.5 (internal behind firewall) Server IP address is : 192.168.50.30 port : 9050 (internal behind firewall) Servers LIVE/External IP (on internet ) : 121.225.xx.xx (accessible from internet) When I specify the above I.P address of server(192.168.50.30), the client connects successfully and can call servers methods. Now suppose if I want to give my friend (outside network/on internet) the client with server's live I.P, i get an ENDPOINTNOTFOUND exceptions. Surprisingly if I run the above client specifying LIVE IP(121.225.xx.xx) of server i also get the same exception. I tried to debug the problem but haven't found anything. Is it a problem with the company firewall not forwarding my request? or is it a problem with the server or client . Is something needed to be added to the server/client to overcome the same problem? Or are there any settings on the firewall that need to be changed like port forwarding? (our network admin has configured the port to be accessible from the internet.) is it a authentication issue? Code is available at . http://www.ralfw.de/weblog/wcfsimple.txt http://weblogs.asp.net/ralfw/archive/2007/04/14/a-truely-simple-example-to-get-started-with-wcf.aspx i have just separated the client and server part in separate assemblies.rest is same. using System; using System.Collections.Generic; using System.Text; using System.ServiceModel; namespace WCFSimple.Contract { [ServiceContract] public interface IService { [OperationContract] string Ping(string name); } } namespace WCFSimple.Server { [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)] class ServiceImplementation : WCFSimple.Contract.IService { #region IService Members public string Ping(string name) { Console.WriteLine("SERVER - Processing Ping('{0}')", name); return "Hello, " + name; } #endregion } public class Program { private static System.Threading.AutoResetEvent stopFlag = new System.Threading.AutoResetEvent(false); public static void Main() { ServiceHost svh = new ServiceHost(typeof(ServiceImplementation)); svh.AddServiceEndpoint( typeof(WCFSimple.Contract.IService), new NetTcpBinding(), "net.tcp://localhost:8000"); svh.Open(); Console.WriteLine("SERVER - Running..."); stopFlag.WaitOne(); Console.WriteLine("SERVER - Shutting down..."); svh.Close(); Console.WriteLine("SERVER - Shut down!"); } public static void Stop() { stopFlag.Set(); } } } namespace WCFSimple { class Program { static void Main(string[] args) { Console.WriteLine("WCF Simple Demo"); // start server System.Threading.Thread thServer = new System.Threading.Thread(WCFSimple.Server.Program.Main); thServer.IsBackground = true; thServer.Start(); System.Threading.Thread.Sleep(1000); // wait for server to start up // run client ChannelFactory<WCFSimple.Contract.IService> scf; scf = new ChannelFactory<WCFSimple.Contract.IService>( new NetTcpBinding(), "net.tcp://localhost:8000"); WCFSimple.Contract.IService s; s = scf.CreateChannel(); while (true) { Console.Write("CLIENT - Name: "); string name = Console.ReadLine(); if (name == "") break; string response = s.Ping(name); Console.WriteLine("CLIENT - Response from service: " + response); } (s as ICommunicationObject).Close(); // shutdown server WCFSimple.Server.Program.Stop(); thServer.Join(); } } } Any help?

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• Why do UInt16 arrays seem to add faster than int arrays?

  - by scraimer

  It seems that C# is faster at adding two arrays of UInt16[] than it is at adding two arrays of int[]. This makes no sense to me, since I would have assumed the arrays would be word-aligned, and thus int[] would require less work from the CPU, no? I ran the test-code below, and got the following results: Int for 1000 took 9896625613 tick (4227 msec) UInt16 for 1000 took 6297688551 tick (2689 msec) The test code does the following: Creates two arrays named a and b, once. Fills them with random data, once. Starts a stopwatch. Adds a and b, item-by-item. This is done 1000 times. Stops the stopwatch. Reports how long it took. This is done for int[] a, b and for UInt16 a,b. And every time I run the code, the tests for the UInt16 arrays take 30%-50% less time than the int arrays. Can you explain this to me? Here's the code, if you want to try if for yourself: public static UInt16[] GenerateRandomDataUInt16(int length) { UInt16[] noise = new UInt16[length]; Random random = new Random((int)DateTime.Now.Ticks); for (int i = 0; i < length; ++i) { noise[i] = (UInt16)random.Next(); } return noise; } public static int[] GenerateRandomDataInt(int length) { int[] noise = new int[length]; Random random = new Random((int)DateTime.Now.Ticks); for (int i = 0; i < length; ++i) { noise[i] = (int)random.Next(); } return noise; } public static int[] AddInt(int[] a, int[] b) { int len = a.Length; int[] result = new int[len]; for (int i = 0; i < len; ++i) { result[i] = (int)(a[i] + b[i]); } return result; } public static UInt16[] AddUInt16(UInt16[] a, UInt16[] b) { int len = a.Length; UInt16[] result = new UInt16[len]; for (int i = 0; i < len; ++i) { result[i] = (ushort)(a[i] + b[i]); } return result; } public static void Main() { int count = 1000; int len = 128 * 6000; int[] aInt = GenerateRandomDataInt(len); int[] bInt = GenerateRandomDataInt(len); Stopwatch s = new Stopwatch(); s.Start(); for (int i=0; i<count; ++i) { int[] resultInt = AddInt(aInt, bInt); } s.Stop(); Console.WriteLine("Int for " + count + " took " + s.ElapsedTicks + " tick (" + s.ElapsedMilliseconds + " msec)"); UInt16[] aUInt16 = GenerateRandomDataUInt16(len); UInt16[] bUInt16 = GenerateRandomDataUInt16(len); s = new Stopwatch(); s.Start(); for (int i=0; i<count; ++i) { UInt16[] resultUInt16 = AddUInt16(aUInt16, bUInt16); } s.Stop(); Console.WriteLine("UInt16 for " + count + " took " + s.ElapsedTicks + " tick (" + s.ElapsedMilliseconds + " msec)"); }

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