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• Failure to toubleshoot a juju charm deployment

  - by Bruno Pereira

  My environments.yaml looks like this: environments: test: type: local control-bucket: juju-a14dfae3830142d9ac23c499395c2785999 admin-secret: 6608267bbd6b447b8c90934167b2a294999 default-series: oneiric juju-origin: distro data-dir: /home/bruno/projects/juju juju bootstrap runs perfect: 2011-11-22 19:19:31,999 INFO Bootstrapping environment 'test' (type: local)... 2011-11-22 19:19:32,004 INFO Checking for required packages... 2011-11-22 19:19:33,584 INFO Starting networking... 2011-11-22 19:19:34,058 INFO Starting zookeeper... 2011-11-22 19:19:34,283 INFO Starting storage server... 2011-11-22 19:19:40,051 INFO Initializing zookeeper hierarchy 2011-11-22 19:19:40,247 INFO Starting machine agent (origin: distro)... [sudo] password for bruno: 2011-11-22 19:23:16,054 INFO Environment bootstrapped 2011-11-22 19:23:16,079 INFO 'bootstrap' command finished successfully Deploy from a known good charm is accepted (tried it with one that I am trying to create): juju deploy --repository=/home/bruno/projects/charms_repo/ local:teamspeak 2011-11-22 19:28:49,929 INFO Charm deployed as service: 'teamspeak' 2011-11-22 19:28:49,962 INFO 'deploy' command finished successfully After this I can see that juju debug-log shows activity and I can see the network indicator going on and off and activity on my hard-disk. Wait... Looking at juju status I get: services: teamspeak: charm: local:oneiric/teamspeak-1 relations: {} units: teamspeak/0: machine: 0 public-address: 192.168.122.226 relations: {} state: start_error juju debug-log does not help and I have no files under /var/log/juju or /var/lib/juju. Last juju debug-log only shows this: 2011-11-22 19:45:20,790 Machine:0: juju.agents.machine DEBUG: Units changed old:set(['wordpress/0']) new:set(['wordpress/0', 'teamspeak/0']) 2011-11-22 19:45:20,823 Machine:0: juju.agents.machine DEBUG: Starting service unit: teamspeak/0 ... 2011-11-22 19:45:21,137 Machine:0: juju.agents.machine DEBUG: Downloading charm local:oneiric/teamspeak-1 to /home/bruno/projects/juju/bruno-test/charms 2011-11-22 19:45:22,115 Machine:0: juju.agents.machine DEBUG: Starting service unit teamspeak/0 2011-11-22 19:45:22,133 Machine:0: unit.deploy INFO: Creating container teamspeak-0... 2011-11-22 19:47:04,586 Machine:0: unit.deploy INFO: Container created for teamspeak/0 2011-11-22 19:47:04,781 Machine:0: unit.deploy DEBUG: Charm extracted into container 2011-11-22 19:47:04,801 Machine:0: unit.deploy DEBUG: Starting container... 2011-11-22 19:47:07,086 Machine:0: unit.deploy INFO: Started container for teamspeak/0 2011-11-22 19:47:07,107 Machine:0: juju.agents.machine INFO: Started service unit teamspeak/0 How can I troubleshot what is happening here?

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• Page Zipper Unpacks Multi-Page Articles for Single-Page Display

  - by ETC

  It’s annoying when you find an article worth reading but it’s diced up into little segments. Skip clicking next-next-next to read; use Page Zipper to unpack multi-page articles and read them all on one page. Page Zipper is available as both a bookmarklet and a Firefox extension. You simply click on the bookmarklet (or extension icon) when you’re looking at a segmented article or gallery. Page Zipper renders the page with all the individual pages laid out for easy reading. No more clicking next a dozen times to get to the end of the article or gallery. In addition unpacking long articles it also rocks keyboard shortcuts for viewing galleries and automatically resizes images to best-fit your browser window. Check the video above to see the article and gallery features in action. Visit the link below to read more and grab a copy of Page Zipper for your browser. Page Zipper [PrintWhatYouLike] Latest Features How-To Geek ETC How to Get Amazing Color from Photos in Photoshop, GIMP, and Paint.NET Learn To Adjust Contrast Like a Pro in Photoshop, GIMP, and Paint.NET Have You Ever Wondered How Your Operating System Got Its Name? Should You Delete Windows 7 Service Pack Backup Files to Save Space? What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? Page Zipper Unpacks Multi-Page Articles for Single-Page Display Minty Bug: Build an FM Bug Inside a Mint Container Get the MakeUseOf eBook Guide to Hacker Proofing Your PC Sync Your Windows Computer with Your Ubuntu One Account [Desktop Client] Awesome 10 Meter Curved Touchscreen at the University of Groningen [Video] TV Antenna Helper Makes HDTV Antenna Calibration a Snap

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• Add physical disk to KVM virtual machine

  - by evan

  I'm setting up a file server (nas4free) as a KVM virtual machine on a Ubuntu Server 12.04 system. How do I add physical hard drives directly to the VM so they can be used by the guest (nas4free), but not the host? Specifically the hard drive I'd like to mount is /dev/sda (which is not currently mounted on the server.) So far I've found two solutions but I haven't gotten either to work. The first is from Server Fault where it's suggested to use virt-manager. I haven't gotent this to work because when I try to select an existing drive nothing is being listed. My best guess as to why this is, is because I'm using virt-manager over ssh and not connecting as root, should that make a difference? The second solution I've found here is to just run the command (modified for my system) qm set nas4free -virtio /dev/sda but that seems to require proxmox which I don't have installed and doesn't seem to be in the default repositories? Finally, once the above is sorted out and I can mount the drive directly to the VM, does anyone have an experience with whether the drive should be mounted to the VM as scsi, ide, or virtio? (I know virtio was recommend in the linked ServerFault page, but I hadn't heard of it before now since I mainly use VMWare). Thanks for your help!!!

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• Oracle SQL Developer: Single Object Compare

  - by thatjeffsmith

  There’s a nasty rumor going around that you can’t compare database objects and/or code in Oracle SQL Developer. So let’s put that to bed right now. First, here’s how to compare: PL/SQL to PL/SQL or a SQL statement to another SQL statement So now that that’s settled, why don’t we take a look at how to compare a single table, to another table – whether it’s in the same database or a different database. Database Diff There’s no additional licensing requirement here. If you have SQL Developer, you can use this feature. if you’re going to compare 1 table to another, make sure you ONLY have ‘tables’ checked And then, use this dialog to select your table(s): Move over the object(s) you want to compare over to the right hand side. And now we can move onto the results. The differences, side-by-side, and the script to make B look like A Common lines with differences are highlighted in blue, new lines are highlighted in red. So that’s why they are different, but here’s the script to synch up the differences: Read the script, TEST the script, apply the script. And that’s it. Well, that’s mostly it. If you have questions about how to compare a database object in a schema you don’t have the login information for, read this post next.

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• Windows Azure Virtual Machine Test Drive Kit

  - by Clint Edmonson

  The public preview of hosted Virtual Machines in Windows Azure is now available to the general public. This platform preview enables you to evaluate our new IaaS and Enterprise Networking capabilities. Once you have registered for the 90 Day Free Trial and created a new account, you can access the preview directly at this link: https://account.windowsazure.com/PreviewFeatures If you’ve been to any of my presentations lately, you’ll know that I’m fired up about these new offerings. As I’ve worked through some scenarios for myself and with my customers, I’ve been collecting the resources that helped me to ramp up. Here’s a collection of links to the items I’ve found most useful: Core Resources Digital Chalk Talk Videos – detailed technical overviews of the new Windows Azure services and supporting technologies as announced June 7, including Virtual Machines (IaaS Windows and Linux), Storage, Command Line Tools http://www.meetwindowsazure.com/DigitalChalkTalks Scenarios Videos on You Tube – “how to” guides, including “Create and Manage Virtual Networks”, “Create & Manage SQL Database”, and many more http://www.youtube.com/user/windowsazure Windows Azure Trust Center - provides a comprehensive of view of Windows Azure and security and compliance practices http://www.windowsazure.com/en-us/support/trust-center/ MSDN Forums for Windows Azure http://www.windowsazure.com/en-us/support/preview-support/ Microsoft Knowledge Base article Microsoft server software support for Windows Azure Virtual Machines Videos Deep Dive into Running Virtual Machines on Windows Azure Windows Azure Virtual Machines and Virtual Networks Windows Azure IaaS and How It Works Deep Dive into Windows Azure Virtual Machines: From the Cloud Vendor and Enterprise Perspective An Overview of Managing Applications, Services, and Virtual Machines in Windows Azure Monitoring and Managing Your Windows Azure Applications and Services Overview of Windows Azure Networking Features Hybrid Will Rule: Options to Connect, Extend and Integrate Applications in Your Data Center and Windows Azure Business Continuity in the Windows Azure Cloud Linux on Windows Azure Blogs Understanding Windows Azure Virtual Machines An Overview of Windows Azure Virtual Network Virtual Machines and Windows Running SQL Server in a Windows Azure Virtual Machine Support for Linux Virtual Machines on Windows Azure

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• Multi MVC processing vs Single MVC process

  - by lordg

  I've worked fairly extensively with the MVC framework cakephp, however I'm finding that I would rather have my pages driven by the multiple MVC than by just one MVC. My reason is primarily to maintain an a more DRY principle. In CakePHP MVC: you call a URL which calls a single MVC, which then calls the layout. What I want is: you call a URL, it processes a layout, which then calls multiple MVC's per component/block of html on the page. When you compare JavaScript components, AJAX, and server side HTML rendering, it seems the most consistent method for building pages is through blocks of components or HTML views. That way, the view block could be situated either on the server or the client. This is technically my ONLY disagreement with the MVC model. Outside of this, IMHO MVC rocks! My question is: What other RAD frameworks follow the same principles as MVC but are driven rather by the View side of MVC? I've looked at Django and Ruby on Rails, yet they seems to be more Controller driven. Lift/Scala appears to be somewhat of a good fit, but i'm interested to see what others exist.

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• The Inebriator: A DIY Arduino-powered Cocktail Machine [Video]

  - by Jason Fitzpatrick

  We’ve seen our fair share of geeky alcohol-related projects over the years but this, this, is something to see. The Inebriator is the slickest automated drink machine we’ve laid eyes on. Before we even start talking specs, check out the video above–don’t forget to first assure your liver that you don’t actually have access to such a magnificent device and it can remain calm. As dazzled as we were? The whole thing is powered by an Arduino Mega 2560, sports a cooler with nitrogen pressurization of drink mix bottles, and relies on a rather ingenious and elegantly simple 12v valve system. It even has an RFID security system to prevent party goers with a few drinks in them from messing up the custom drink menu. Hit up the link below for more information, including photos of the guts and technical specs. The Inebriator [via Hack A Day] Java is Insecure and Awful, It’s Time to Disable It, and Here’s How What Are the Windows A: and B: Drives Used For? HTG Explains: What is DNS?

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• Diagram that could explain a state machine's code?

  - by Incognito

  We have a lot of concepts in making diagrams like UML and flowcharting or just making up whatever boxes-and-arrows combination works at the time, but I'm looking at doing a visual diagram on something that's actually really complex. State machines like those that parse HTML or regular expressions tend to be very long and complicated bits of code. For example, this is the stateLoop for FireFox 9 beta. It's actually generated by another file, but this is the code that runs. How can I diagram something with the complexity of this in a way that explains flow of the code without taking it to a level where I draw every single line-of-code into it's own box on a flowchart? I don't want to draw "Invoke loop, then return" but I don't want to explain every last detail. What kind of graph is suitable to do this? Is there already something out there similar to this? Just an example of how to do this without going overboard in complexity or too-high-level is really what I want. If you don't feel like looking at the code, basically it's 70 different state flags that could occur, inside an infinite loop that exists to a label based on some conditions, each flag has it's own infinite loop that exists to a label somewhere, and each of those loops has checks for different types of chars, which then runs off into various other methods.

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• SQLBeat Podcast – Episode 4 – Mark Rasmussen on Machine Guns,Jelly Fish and SQL Storage Engine

  - by SQLBeat

  In this this 4th SQLBeat Podcast I talk with fellow Dane Mark Rasmussen on SQL, machine guns and jelly fish fights; apparently they are common in our homeland. Who am I kidding, I am not Danish, but I try to be in this podcast. Also, we exchange knowledge on SQL Server storage engine particulars as well as some other “internals” like password hashes and contained databases. And then it just gets weird and awesome. There is lots of background noise from people who did not realize we were recording. And I call them out and make fun of them as they deserve; well just one person who is well known in these parts. I also learn the correct (almost) pronunciation of “fjord”. Seriously, a word with an “F” followed by a “J”. And there are always the hippies and hipsters to discuss. Should be fun.

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• What are the advantages of Maven when it comes to single man, educational projects

  - by Leron

  I've spend a few hours playing around with Maven + reading some stuff on the apache official site and also a few random googled articles. By this I mean that I really tried to find the answers myself - both by reading and by doing things on my own. Also maybe worth to mention that I installed the m2e plugin so most of the time I've tried things out from Eclipse and not using the command line too much. However aside from the generated project that for example prevent me from using the default package I didn't see that much of a difference with the standard way I've created my projects before try Maven. In fact I've almost decided to skip Maven for now and move on to the other technology I wanted to learn more in-depth - Hibernate, but when I start with opening the official page the first thing I've read was the recommendation to use Hibernate with Maven. That get me confused and made me taking a step back and trying once more to find what I'm obviously missing right now. As it's said in the maven.apache.. site, the true strength of Maven is shown when you work on large projects with other people, but I lack the option to see how Maven is really used in this scenario, still i think that there are maybe advantages even when it comes to working with small projects alone, but I really have difficulties to point them out. So what do you think are the advantages of Maven when it's used for small projects writing from a single person. What are the things that I should be aware of and try to exploit (I mean features offered by Maven) that can come in handy in this situations?

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• Gathering all data in single iteration vs using functions for readable code

  - by user828584

  Say I have an array of runners with which I need to find the tallest runner, the fastest runner, and the lightest runner. It seems like the most readable solution would be: runners = getRunners(); tallestRunner = getTallestRunner(runners); fastestRunner = getFastestRunner(runners); lightestRunner = getLightestRunner(runners); ..where each function iterates over the runners and keeps track of the largest height, greatest speed, and lowest weight. Iterating over the array three times, however, doesn't seem like a very good idea. It would instead be better to do: int greatestHeght, greatestSpeed, leastWeight; Runner tallestRunner, fastestRunner, lightestRunner; for(runner in runners){ if(runner.height > greatestHeight) { greatestHeight = runner.height; tallestRunner = runner; } if(runner.speed > ... } While this isn't too unreadable, it can get messy when there is more logic for each piece of information being extracted in the iteration. What's the middle ground here? How can I use only a single iteration while still keeping the code divided into logical units?

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• Merging multiple top-level domains into a single domain

  - by user23089

  My client had multiple top-level-domains. Each one represented an insurance program within a specific vertical. For all the sites at these alternate domains, there was a 30/70 mix of duplicate vs. original content. Some of the alternate domains ranked very well for their target keyphrase groups, where others were absent in results pages. We advised the client to merge multiple domains into their existing main domain, for usability and SEO reasons. We recently ran the merger. Here was our process: On the main domain, transfer the content such that it matches 1-for-1 content on the various alternate domains Setup Google Webmaster Tools on the main domain Push the new content on the main domain live and submit a corresponding sitemap to Google Establish 301 redirects on the alternate domains, such that each alternate domain URL points to its respective page on the main domain We did this 12 days ago, and pages (previously on the alternate domains) that had ranked well on Google have now plummeted or are entirely non-existent. Did we do the right thing by merging multiple top-level domains into a single domain? Is this initial dip in rankings normal? How soon should we expect to see it return to its normal rankings?

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• Test a simple multi-player (upto four players) Android game in single developer machine

  - by Kush

  I'm working on a multi-player Android game (very simple it is that it doesn't have any game-engine used). The game is based on Java Socket. Four devices will connect the game server and a new thread will manage their session. The game server will server many such sessions (having 4 players each). What I'm worried about is the testing of this game. I know it is possible to run multiple android emulators, but my development laptop is very limited in capabilities (3 GB RAM, 2 Ghz Intel Core2Duo and on-board Graphics). And I'm already using Ubuntu to develop the game so that I have more user memory available than I'd have with Windows. Hence, the laptop will burn-to-death on running 4 emulator instances. I don't have access to any android device, neither I have another machine with higher configuration. And I still have to develop and test this game. P.S. : I'm a CS student, and currently don't work anywhere, and this game is college project, so if there are any paid solutions, I cannot afford it. What can I do to test the app seamlessly? ability to test even only 4 clients (i.e. only 1 session) would suffice, its alright if I can't simulate real environment with some 10-20 active game sessions (having 4 players each).

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• Introducing the Industry's First Analytics Machine, Oracle Exalytics

  - by Manan Goel

  Analytics is all about gaining insights from the data for better decision making. The business press is abuzz with examples of leading organizations across the world using data-driven insights for strategic, financial and operational excellence. A recent study on “data-driven decision making” conducted by researchers at MIT and Wharton provides empirical evidence that “firms that adopt data-driven decision making have output and productivity that is 5-6% higher than the competition”. The potential payoff for firms can range from higher shareholder value to a market leadership position. However, the vision of delivering fast, interactive, insightful analytics has remained elusive for most organizations. Most enterprise IT organizations continue to struggle to deliver actionable analytics due to time-sensitive, sprawling requirements and ever tightening budgets. The issue is further exasperated by the fact that most enterprise analytics solutions require dealing with a number of hardware, software, storage and networking vendors and precious resources are wasted integrating the hardware and software components to deliver a complete analytical solution. Oracle Exalytics In-Memory Machine is the world’s first engineered system specifically designed to deliver high performance analysis, modeling and planning. Built using industry-standard hardware, market-leading business intelligence software and in-memory database technology, Oracle Exalytics is an optimized system that delivers answers to all your business questions with unmatched speed, intelligence, simplicity and manageability. Oracle Exalytics’s unmatched speed, visualizations and scalability delivers extreme performance for existing analytical and enterprise performance management applications and enables a new class of intelligent applications like Yield Management, Revenue Management, Demand Forecasting, Inventory Management, Pricing Optimization, Profitability Management, Rolling Forecast and Virtual Close etc. Requiring no application redesign, Oracle Exalytics can be deployed in existing IT environments by itself or in conjunction with Oracle Exadata and/or Oracle Exalogic to enable extreme performance and best in class user experience. Based on proven hardware, software and in-memory technology, Oracle Exalytics lowers the total cost of ownership, reduces operational risk and provides unprecedented analytical capability for workgroup, departmental and enterprise wide deployments. Click here to learn more about Oracle Exalytics.  

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• Exadata X3 In-Memory Database Machine: To be or not to be

  - by Luis Moreno Campos

  Since Larry Ellison announced Oracle Exadata X3 as the new generation of the Database Machine, he established the product in the In-Memory Database arena. And that annoyed some people. We all know that In-Memory Databases are the ones that *only* execute in memory and use the other layers of storage for persistency (mainly disk). Oracle database has always been a technology that uses memory as a caching mechanism and that hasn't change nor it will change with Oracle Database 12c. So this is the central point of fuss when it comes to announcing an Engineered Systems as In-Memory Database, when in fact it still runs Oracle Database, not vanilla but still the same product. Let me tell you purist people out there: when you find no new ground breaking point to get all excited about you decide to bash it, and go against its claims. It's not like a car manufacturer that launches a mini-van in the market and calls it a Sports Car, we are talking about a fundamental change in the ILM stack: level 2 of caching is now self sufficient. It's not DRAM? Who cares, still let's you put in flash amounts of data not done up until now, so I guess Oracle can name it whatever Larry wants because in the end it's something never done before. Now let's imagine that you hop on the pure In-Memory Database bandwagon. You would be stuck with a database technology that lags behind the Oracle Database hundreds of light years in man/hours innovations and features. Do you really want to travel back in time? Remember, the first rule about time travelling is that "Security is not Guaranteed". Your choice. LMC

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• SQL SERVER – Grouping by Multiple Columns to Single Column as A String

  - by pinaldave

  One of the most common questions I receive in email is how to group multiple column data in comma separate values in a single row grouping by another column. I have previously blogged about it in following two blog posts. However, both aren’t addressing the following exact problem. Comma Separated Values (CSV) from Table Column Comma Separated Values (CSV) from Table Column – Part 2 The question comes in many different formats but in following image I am demonstrating the same question in simple words. This is the most popular question on my Facebook page as well. (Example) Here is the sample script to build the sample dataset. CREATE TABLE TestTable (ID INT, Col VARCHAR(4)) GO INSERT INTO TestTable (ID, Col) SELECT 1, 'A' UNION ALL SELECT 1, 'B' UNION ALL SELECT 1, 'C' UNION ALL SELECT 2, 'A' UNION ALL SELECT 2, 'B' UNION ALL SELECT 2, 'C' UNION ALL SELECT 2, 'D' UNION ALL SELECT 2, 'E' GO SELECT * FROM TestTable GO Here is the solution which will build an answer to the above question. -- Get CSV values SELECT t.ID, STUFF( (SELECT ',' + s.Col FROM TestTable s WHERE s.ID = t.ID FOR XML PATH('')),1,1,'') AS CSV FROM TestTable AS t GROUP BY t.ID GO I hope this is an easy solution. I am going to point to this blog post in the future for all the similar questions. Final Clean Up Act -- Clean up DROP TABLE TestTable GO Here is the question back to you - Is there any better way to write above script? Please leave a comment and I will write a separate blog post with due credit. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology Tagged: SQL XML

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• Animating DOM elements vs refreshing a single Canvas

  - by mgibsonbr

  A few years ago, when the HTML Canvas element was still kinda fresh, I wrote a small game in a rather "unusual" way: each game element had its own canvas, and frequently animated elements even had multiple canvases, one for each animation sprite. This way, the translation would be done by manipulating the DOM position of the canvases, while the sprite animation would consist of altering the visibility of the already drawn canvases. (z-indexes, of course, were the tricky part) It worked like a charm: even in IE6 with excanvas it showed a decent performance, and everything was rather consistent between browsers, including some smartphones. Now I'm thinking in writing a larger game engine in the same fashion, so I'm wondering whether it would be a good idea to do so in the current context (with all the advances in browsers and so on). I know I'm trading memory for time, so this needs to be customizable (even at runtime) for each machine the game will be running. But I believe using separate canvases would also help to avoid the game "freezing" on CPU spikes, since the translation would still happen even if the redraws lag for a while. Besides, the browsers' rendering engines are already optimized in may ways, so I'm guessing this scheme would also reduce the load on the CPU (in contrast to doing everything in JavaScript - specially the less optimized ones). It looks good in my head, but I'd like to hear the opinion of more experienced people before proceeding further. Is there any known drawback of doing this? I'm particulartly unexperienced in dealing with the GPU, so I wonder whether this "trick" would nullify any benefit of using a single, big canvas. Or maybe on modern devices it's overkill (though I'm skeptic about the claims that canvas+js - especially WebGL - will ever be a good alternative to native code). Any thoughts?

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• Fixing Two keys events on single key press by xmodmap

  - by William.Ebe

  I'm using Dell Latitude D620. Whenever, I'm pressing the space key, the down arrow key also triggered perform it's action. Here is the log: KeyPress event, serial 30, synthetic NO, window 0x3200001, root 0x10c, subw 0x0, time 2248017, (70,-9), root:(76,39), state 0x0, keycode 116 (keysym 0xff54, Down), same_screen YES, XLookupString gives 0 bytes: XmbLookupString gives 0 bytes: XFilterEvent returns: False KeyPress event, serial 31, synthetic NO, window 0x3200001, root 0x10c, subw 0x0, time 2248018, (70,-9), root:(76,39), state 0x0, keycode 65 (keysym 0x20, space), same_screen YES, XLookupString gives 1 bytes: (20) " " XmbLookupString gives 1 bytes: (20) " " XFilterEvent returns: False KeyRelease event, serial 33, synthetic NO, window 0x3200001, root 0x10c, subw 0x0, time 2248083, (70,-9), root:(76,39), state 0x0, keycode 65 (keysym 0x20, space), same_screen YES, XLookupString gives 1 bytes: (20) " " XFilterEvent returns: False KeyRelease event, serial 33, synthetic NO, window 0x3200001, root 0x10c, subw 0x0, time 2248085, (70,-9), root:(76,39), state 0x0, keycode 116 (keysym 0xff54, Down), same_screen YES, XLookupString gives 0 bytes: XFilterEvent returns: False ClientMessage event, serial 33, synthetic YES, window 0x3200001, message_type 0x157 (WM_PROTOCOLS), format 32, message 0x155 (WM_DELETE_WINDOW) The above log is for a single press+release of spacebar key. I would like to know how to fix that. Thanks. PS: I'm using the same laptop to post question. If somebody helps to align it into code format, it would be helpful as I can't do that with this keyboard properly.

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• Internet is far slower in Ubuntu than Windows 7 on dual-booted machine

  - by Tim

  Edit: I'll leave the original post as-is, but after further investigation, it appears that the problem is something to do with my wi-fi card. Speeds are normal when I connect via cable. Edit 2: Problem was solved. It was something to do with the wireless card drivers. I normally use Windows 7 on my laptop and have internet speeds that are normally about 15-20 Mb/s. I have recently dual-booted with Ubuntu 12.10, and have noticed that internet speeds are drastically slower in Ubuntu. When tested, speeds range from 0.2-2 Mb/s, although occasionally being significantly faster than that or even stopping completely for short periods of time. I've also noticed that when first booting into Ubuntu, speeds start fairly fast, and drop to incredibly slow with a few seconds to a few minutes. There's still some possibility that the issue may be with my ISP, as things seem slower than usual even in Windows, but I suspect that it is related to Ubuntu, as things are far slower in Ubuntu than in Windows. I'm wondering, what could be the cause of this? Potentially relevant information: -I've dual booted before on this machine with earlier versions of Ubuntu (different ISP at the time) with no problem. ISP: Rogers (Major Canadian ISP) System info (Gateway NV53a Laptop): Operating System MS Windows 7 Home Premium 64-bit CPU AMD Phenom II N970 Caspian 45nm Technology RAM 6.00 GB Dual-Channel DDR3 @ 664MHz (9-9-9-24) Motherboard Gateway SJV51_DN (Socket S1G4) Graphics Generic PnP Monitor (1366x768@60Hz) ATI Mobility Radeon HD 4250 (Acer Incorporated [ALI]) Hard Drives 733GB TOSHIBA TOSHIBA MK7559GSXP ATA Device (SATA) Networking info: Connected through Wi-Fi Atheros AR5B97 Wireless Network A

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• Logic / Render phases with a single thread

  - by DevilWithin

  The question I have may generate different opinions from different developers, but I'd still like to have an answer on this. Its all about the updating and rendering steps of the game loop, and their use under multi and single threaded environments. Currently, there is one thread running, which takes care of sequentially executing events , logic and rendering. Sometimes, the logic part may wish to change the game state to something else, and in between do some loading of files. The result is that the game hangs completely while loading, and then proceeds to normal rendering of the new state. To go around this, i could make another thread, do the loading there while the main thread renders a smooth loading animation, and then proceed normally. The real question is about if i don't create another thread. I could refresh the screen from the logic thread, and provide some basic loading screen, which could be not so smoothly updated while the files load. In fact, this approach is not loved by a lot of developers, as it scrambles render code in the logic step, which may cause problems of different sorts.. Hope its clear!

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• how to make a continuous machine gun sound-effect

  - by Jan

  I am trying to make an entity fire one or more machine-guns. For each gun I store the time between shots (1.0 / firing rate) and the time since the last shot. Also I've loaded ~10 different gun-shot sound-effects. Now, for each gun I do the following: function update(deltatime): timeSinceLastShot += deltatime if timeSinceLastShot >= timeBetweenShots + verySmallRandomValue(): timeSinceLastShot -= timeBetweenShots if gunIsFiring: displayMuzzleFlash() spawnBullet() selectRandomSound().play() But now I often get a crackling noise (which I assume is when two or more guns are firing at the same time and confuse the sound-device). My question is whether A) This a common problem and there is a well-known solution, maybe to do with the channels or something, or B) I am using a completely wrong approach to the task. I had a look at some sound-assets for other games and they used complete burst with multiple shots. I suppose I could try that, but I would like to have organic little hickups in the gun-fire (that's what the random value is for) to make the game more gritty and dirty. I am using Panda3D, but I had the exact same problem in PyGame and SDL. [edit] Thanks a lot for the answers so far! One more problem with faking it though: Now how do I stop the sound? Let's say I have an effect with 5 bangs... *bang* *bang* *bang* *bang* *bang* And I magically manage to loop it so that there's no gap or overlap if the player fires more than 5 shots. Now, what do I do if the player stops firing halfway through the third bang? How do I know how long to keep playing the sample so that the third bang is completed and I can start playing the rumbling echo of the last shot? Of course I can look up the shot/pause timing of that sound-sample and code accordingly, but it feels extremely hacky.

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• Updated Virtual Machine for VS/TFS 2010

  - by Enrique Lima

  If you had downloaded the previous version of the virtual machines, then you are likely aware they are set to expire soon (12/15/2010). Brian Keller announced yesterday (blog post here) the availability of a vm refresh (new expiration set for 6/1/2011). What is part of the refresh? Here is the excerpt from Brian’s post: “ The version of this virtual machine which was refreshed on December 9, 2010, includes the following additions: · Visual Studio 2010 Feature Pack 2 · Team Foundation Server 2010 Power Tools (September 2010 Release) · Visual Studio 2010 Productivity Power Tools (these are disabled in VS so that the screenshots of the hands-on-labs still match; you can quickly enable the Productivity Power Tools via Tools -> Extension Manager from within Visual Studio) · Test Scribe for Microsoft Test Manager · Visual Studio Scrum 1.0 Process Template · All Windows Updates through December 8, 2010 · Lab Management GDR (KB983578) · Visual Studio 2010 Feature Pack 2 pre-requisite hotfix (KB2403277) · Microsoft Test Manager hotfix (KB2387011) · Minor fit-and-finish fixes based on customer feedback · A new expiration date of June 1, 2011” The links to download the Virtual Machines are: Hyper-V: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=e0198b64-4acb-4709-b07f-359fb4d523bc&displaylang=en Windows Virtual PC (Win 7): http://www.microsoft.com/downloads/en/details.aspx?FamilyID=509c3ba1-4efc-42b5-b6d8-0232b2cbb26e&displaylang=en

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• canvas tile grid, hover effects, single tilesheet, etc

  - by user121730

  I'm currently in the process of building both the client and server side of an html5, canvas, and WebSocket game. This is what I have thus far for the client: http://jsfiddle.net/dDmTf/7/ Current obstacles The hover effect has no idea what to put back after the mouse leaves. Currently it's just drawing a "void" tile, but I can't figure out how to redraw a single tile without redrawing the whole map. How would I go about storing multiple layers within the map variable? I was considering just using a multi-dimensional array for each layer (similar to what you see as the current array), and just iterating through it, but is that really an efficient way of doing it? Side note The tile sheet being used for the jsfiddle display is only for development. I'll be replacing it as things progress in the engine. I hope you can help! Hopefully you guys can help me, I've been struggling to get through things, since I'm learning how things kind of stuff works as I go. If you guys have any pointers for my JavaScript, feel free. As I'm more or less learning advanced usage as I go, I'm sure I'm doing plenty of things wrong. Note: I will continue to update this post as the engine improves, but updating the jsfiddle link and updating the obstacles list by striking things that have been solved, or adding additions. Thanks!

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• Packing up files on my machine, sending it to a server, and unpacking it

  - by MxyL

  I am implementing a feature in my application that sends all files in a specified folder to a server. I have the basic FTP transaction set up using Apache Commons FTPClient: it sets up a connection and transfers a file from one place to another. So I can simply loop over the directory and use this connection to transfer all the files. However, this could be better. Rather than transferring each file one by one, it makes more sense to pack it up in a compressed archive and then send the whole file at once. Saves time and bandwidth, since these are just text files so they compress nicely. So I would like to add automatic archive packing and unpacking. This is the workflow I have planned out, using zip compression: Zip all files in the folder Send the file over Unzip the files at its destination 1 and 2 are easy since the files are on the local machine, but I'm not sure how to accomplish the last step, when the files are now on a remote server. What are my options? I have control over what I can put and run on the server. Perhaps it is not necessary to do the packing/unpacking myself?

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• Developing an iOS app for a single device - licensing issue

  - by bfavaretto

  I'm developing an iOS app for a museum as a freelancer. It's a very simple video player, to be installed on a single iPad that will be part of a permanent exhibition, basically acting as a kiosk. It turns out the iPad is the ideal device for that if you're looking for a small and affordable touchscreen. The problem is: as far as I can tell, none of the Apple Developer Program options available will allow me to distribute an app like that. The relevant options are (from the link above): iOS Developer Program ($99/year) Select this program if you would like to distribute apps on the App Store as an individual, sole proprietor, company, organization, government entity or educational institution. iOS Developer Enterprise Program ($299/year) Select this program if you would like to develop proprietary apps for internal distribution within your company, organization, government entity or educational institution. The regular program requires distribution through the App Store. The Enterprise version is for internal distribution within my own organization. Neither is the case here! It seems like I'm doomed to violate Apple's terms of service (and I can think of at least two ways of doing that: jailbreaking, or changing the iPad's date so it won't know the provisioning profile expired). Is that really so, or did I get the descriptions wrong? Has anyone here been in a similar situation?

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