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• Upgrade failed, now impossible to restart

  - by Jean Claude Dispaux

  I have an Aspire One with Ubuntu, that I use only when traveling, i.e. seldom. Yesterday I tried to start it, it informed me that I had to install a new release of Ubuntu. The download went fine, then I left it for the night. In the morning I found error messages. I tried to restart, but nothing works any longer. The only backup I have is two USB keys made by the person who installed Ubuntu, that say Recovery Ubuntu 8 and Ubuntu 9.10 respectively. Right now I plugged the "8", selected F12 and instructed to boot from the USB key. It has been running for an hour, the screen still says ubuntu, the USB key flashes red. By the way, I have no precious data on this machine, I do not care about losing data. Please advise on what to do now. Thanks.

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• Vancouver .NET User Group

  - by pluginbaby

  While in Vancouver for my Silverlight training in early May, I will give a free Silverlight presentation at the local .NET User Group, .netBC. When: May 5, 2010, 6:30 PM Where: Building SW3 room 1750, BCIT Burnaby Campus, 3700 Willingdon Ave, Burnaby, BC, V5G 3H2 What: Silverlight 4 Business Applications “In this session a live demo will be built to show the new features of Silverlight 4 that helps you create business-oriented applications easier than ever. Importing/exporting data, printing, drag drop target, data visualization, context menu, WCF RIA Services and design-time enhancements in Visual Studio 2010.” Read all the details here: http://www.netbc.ca/DNCal/EventDetail.aspx?date=2010/05/05 See you there!   Thanks Telerik for helping this event to happen!   Technorati Tags: Silverlight,Silverlight Training

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• CSV files not being written

  - by Kamalpreet

  I worked on a small project in which the data entered in HTML forms was saved in a CSV file which was used subsequently. The files were run on Apache2. It worked fine. After about 25 days, when I reopened the project, the data entered in forms was not saved in CSV file. I checked all the permissions. I even sent a zip file of my files to one of m friends. It worked well on his system. So should I figure it out there's some problem in the system. I am using Ubuntu 13.04. Kindly suggest me something so that I am able to figure out the problem.

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• how does server communication work in a flash game with a php backend

  - by Tim Rogers

  I am trying to create a browser game using actionscript/flash. Currently, I'm trying to understand how I would go about creating a back-end which interfaced with my MySQL database. As far as I understand, If I create a php file on a webserver called test.php and then navigate to a webpage hosted on the server eg. www.example.com/test, the php script will run and display the result in my browser. This would use http. Is this how communication between client and server usually works in a flash game? for example, if the game needed to query the db. Would actionscript have to essentially invoke the url of the php script that would execute the query? it could then parse the data and use it. If this is the case, then is JSON considered a good way to transfer data over http?

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• ApiChange Corporate Edition

  - by Alois Kraus

  In my inital announcement I could only cover a small subset what ApiChange can do for you. Lets look at how ApiChange can help you to fix bugs due to wrong usage of an Api within a fraction of time than it would take normally. It happens that software is tested and some bugs show up. One bug could be …. : We get way too man log messages during our test run. Now you have the task to find the most frequent messages and eliminate the Log calls from the source code. But what about the myriads other log calls? How can we check that the distribution of log calls is nearly equal across all developers? And if not how can we contact the developer to check his code? ApiChange can help you too connect these loose ends. It combines several information silos into one cohesive view. The picture below shows how it is able to fill the gaps. The public version does currently “only” parse the binaries and pdbs to give you for a –whousesmethod query the following colums: If it happens that you have Rational ClearCase (a source control system) in your development shop and an Active Directory in place then ApiChange will try to determine from the source file which was determined from the pdb the last check in user which should be present in your Active Directory. From there it is only a small hop to an LDAP query to your AD domain or the GC (Global Catalog) to get from the user name his Full name Email Phone number Department …. ApiChange will append this additional data all of your query results which contain source files if you add the –fileinfo option. As I said this is currently not enabled by default since the AD domain needs to be configured which are currently only some hard coded values in the SiteConstants.cs source file of ApiChange.Api.dll. Once you got this data you can generate metrics based on source file, developer, assembly, … and add additional data by drag and drop directly into the pivot tables inside Excel. This allows you to e.g. to generate a report which lists the source files with most log calls in descending order along with the developer name and email in the pivot table. Armed with this knowledge you can take meaningful measures e.g. to ask the developer if the huge number of log calls in this source file can be optimized. I am aware that this is a very specific scenario but it is a huge time saver when you are able to fill the missing gaps of information. ApiChange does this in an extensible way. namespace ApiChange.ExternalData {     public interface IFileInformationProvider     {         UserInfo GetInformationFromFile(string fileName);     } } It defines an interface where you can implement your custom information provider to close the gap between source control system and the real person I have to send an email to ask if his code needs a closer inspection.

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• Apache CouchDB and Java

  Accessing the CouchDB database for data storage and retrieval using Java CouchDB - Java - Programming - Languages - FAQs Help and Tutorials

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• Should I be worried if I solve a lot of my problems the same way?

  - by Bryan Harrington

  I really enjoy programming games and puzzle creators/games. I find myself engineering a lot of these problems the same way and ultimately using similar technique to program them that I'm really comfortable with. To give you brief insight, I like to create graphs where nodes are represented with objects. These object hold data such as coordinates, positions and of course references to other neighboring objects. I'll place them all in a data structure and make decisions on this information in a "game loop". While this is a brief example, its not exact in all situations. It's just one way I feel really comfortable with. Is this bad?

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• Error loading PCX image in FreeImage library

  - by khanhhh89

  I'm using FreeImage in C++ for loading texuture from the PCX image. My FreeImage code is as following: FREE_IMAGE_FORMAT fif = FIF_UNKNOWN; //pointer to the image data BYTE* bits(0); fif = FreeImage_GetFileType(m_fileName.c_str(), 0); if (FreeImage_FIFSupportsReading(fif)) dib = FreeImage_Load(fif, m_fileName.c_str()); //retrieve the image data bits = FreeImage_GetBits(dib); //get the image width and height width = FreeImage_GetWidth(dib); height = FreeImage_GetHeight(dib); My problem is the width and height variable are both 512, while the bits array is an empty string, which make the following OPENGL call corrupt: glTexImage2D(m_textureTarget, 0, GL_RGB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, bits); While debugging, I notice that the "fif" variable (which contains the format of the image) is JPEG, while the Image is actually PCX. I wonder whether or not the FreeImage recognize the wrong format (from PCX to JPEG), so tha the bits array is an empty string. I hope to see your explanation about this problem. Thanks so much

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• Recommended solutions for integrating iOS with .NET, at the service tier

  - by George

  I'm developing an application, in iOS, that is required to connect to my Windows Server to poll for new data, update, etc. As a seasoned C# developer, my first instinct is to start a new project in Visual Studio and select Web Service, letting my bias (and comfort level) dictate the service layer of my application. However, I don't want to be biased, and I don't base my decision on a service which I am very familiar with, at the cost of performance. I would like to know what other developers have had success using, and if there is a default standard for iOS service layer development? Are there protocols that are easier to consume than others within iOS? Better ones for the size and/or compression of data? Is there anything wrong with using SOAP? I know it's "big" in comparison to protocols like JSON.

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• ETPM/OUAF 2.3.1 Framework Overview - Session 4

  - by MHundal

  The OUAF Framework Session 4 is now available. This session covered the following topics: 1. Extendable Data Areas - how to extend base owned Data Areas 2. Bundling - how to bundle ETPM Configuration Objects in ETPM 3. Audit on Inquiry - how to enable and view audit on inquiry 4. Advanced Debug - demonstration of the advanced debugger 5. Maintenance Dialogue- An overview of objects required to work with MO's. You can stream the recording using the following link: https://oracletalk.webex.com/oracletalk/ldr.php?AT=pb&SP=MC&rID=71155037&rKey=63c3e75d32277283   You can download the recording using the following link: https://oracletalk.webex.com/oracletalk/lsr.php?AT=dw&SP=MC&rID=71155037&rKey=f3126d1d2894f754

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• how to get new site indexed by alexa

  - by JohnMerlino

  When I search my site on alexa, it says "Alexa Traffic Rank: No Data". So I google the issue. I come across this page: http://www.loudable.com/my-website-data-not-showing-in-alexa-get-your-website-crawled-by-alexasolution.html It says to get site indexed, click Crawl my site on the webmasters page. However there is no longer a link that says "Crawl my site". So as of now, does anyone know how to get site indexed by alexa so that my traffic rank will display on alexa index?

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• How to show other characters in online 2D rpg

  - by Loligans

  I have Player 1 and Player 2 I am using Json to send and retrieve player data between the client and the server, but when another player logs in, and is in the same map, how would I send that data to both players to update the graphics engine to show there are 2 Players on the map? About my game it is a 2D RPG tile based game it is 24x15 Tiles it is Real time Action it should interact anywhere between 10-150 ping players interact with each other when in the same map and can see each other moving around the game world is persistent, and is saved when the server shuts down Right now the server just sends the player Only their information which is inside a Json Object Here is an example of what I am talking about If you notice there are 2 separate characters in 2 separate clients, but they are running on the same server. I am trying to get them to show up on both clients, but I don't know how I should accomplish this. Should I send it as an added value in the Json object? Also what is the name of this process so I can look it up and find more info on it?

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• Webcast: Optimize Accounts Payable Through Automated Invoice Processing

  - by kellsey.ruppel(at)oracle.com

  Is your accounts payable process still very labor-intensive? Then discover how Oracle can help you eliminate paper, automate data entry and reduce costs by up to 90% - while saving valuable time through fewer errors and faster lookups. Join us on Tuesday, March 22 at 10 a.m. PT for this informative Webcast where Jamie Rancourt and Brian Dirking will show how you can easily integrate capture, forms recognition and content management into your PeopleSoft and Oracle E-Business Suite accounts payable systems. You will also see how The Home Depot, Costco and American Express have achieved tremendous savings and productivity gains by switching to automated solutions. Learn how you can automate invoice scanning, indexing and data extraction to:Improve speed and reduce errors Eliminate time-consuming searches Utilize vendor discounts through faster processing Improve visibility and ensure compliance Save costs in accounts payable and other business processesRegister today!

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• JavaOne: Parleys.com, Spring Vs. Java EE and HTML5 tooling

  - by delabassee

  Parleys.com, a 2012 Duke's Choice Award winner, is an E-Learning platform that host content from different sources (conferences, JUGs meetings, etc.). There is a lot of technical content available for online but also offline consumption, including many sessions on Java EE. Parleys has just released, for free, all the Devoxx 2011 sessions (video and slides sync'ed!). From a technical point of view, Parleys.com is interesting as they have switched from Spring to Java EE 6 to avoid being locked in a proprietary framework. During the GlassFish Community BoF, Stephan Janssen (Parleys.com and Devoxx founder) also presented how GlassFish is used to support 2000 concurrent Parleys users over a cluster of 2 GlassFish instances. Talking about Java EE and/or Spring, Harshad Oak has posted an update on the 'Spring Vs. Java EE' panel discussion that took place on Tuesday. As Arun said standards such as Java EE does not necessarily refrain innovation: "JBoss Forge & Arquillian from RedHat are great examples of innovation in the JavaEE community. Standardization is important but innovation does continue even within that framework." Simplicity, productivity along with HTML5 are the driving themes of Java EE 7. In terms of simplicity and productivity, the developer experience can also be improved by the tooling. Every NetBeans release comes with a large set of improvements, the just released NetBeans 7.3 beta is no exception. The goal of ‘NB 7.3’s Project Easel’ is to improve HTML5 development, something that will be handy for Java EE 7 developers. Project Easel can, for example, communicate directly to Chrome's WebKit engine, this feature was shown during Sunday's Technical Keynote at the end of the Java EE section. In this beta release, Chrome and the embedded JavaFX browser are the only supported browsers but the NetBeans team plan to add support, over time, for other WebKit based browsers. NetBans 7.3 beta NetBeans 7.3 screenscasts Today (i.e. Wednesday 3rd) is also the final exhibition day, so make sure to visit the Java EE and the GlassFish pods on the Java DEMOgrounds (Hilton Grand Ballroom, 9:30 am - 5:00 pm). Finally, here are some Java EE and GlassFish related activities worth attending today if you are at JavaOne : Wednesday October 3rd Time Title Location 8:30-9:30am What's New in Servlet 3.1: An Overview Parc 55 Mission 8:30-9:30am Bean Validation 1.1: What's New Under the Hood Parc 55Cyril Magnin II/III 10:00-11:00am JSR 353: Java API for JSON Processing Parc 55 Mission 10:00-12:00pm Tutorial : Integrating Your Service into the GlassFish PaaS Platform Parc 55 Devisidero 11:30-12:30pm What's New in JSF: A Complete Tour of JSF 2.2 Parc 55Cyril Magnin I 11:30-12:30pm Best of Both Worlds: Java Persistence with NoSQL and SQL Parc 55 Mission 1:00-2:00pm Sharding Middleware to Achieve Elasticity and High Availability in the Cloud Parc 55Market Street 1:00-2:00pm Pimp My RESTful Java Applications Parc 55Cyril Magnin I 3:00-4:00pm Migrating Spring to Java EE Parc 55Cyril Magnin II/III 4:30-5:30pm JavaEE.Next(): Java EE 7, 8, and Beyond Parc 55Cyril Magnin II/III 4:30-5:30pm HTML5 WebSocket and Java Parc 55Cyril Magnin I 4:30-5:30pm Easy Middleware for Your Embedded Device Nikko Ballroom II/III

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• Google Analytics with multiple environments

  - by marcof

  We are planning to use Google Analytics in our organization and I am in charge for setting it up. I was wondering how to deal with multiple environments. We sure do not want to collect data during development and QA (or maybe collect data to a different analytics account), but we want to when the site goes to production (obviously). How do you deal with multiple environments and Google Analytics ? Do you setup multiple accounts for Google Analytics and use either one depending on the environement ? We're using ASP.NET 2.0, if that matters.

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• Updates broke my themes/shell [Ubuntu 12.04 running Gnome 3 ]

  - by APNW

  I am running gnome-session 3.4.2.1. After the latest updates (listed below) my theme regressed to what looks like tango - not sure. Am unable to change it using Gnome-tweak tool or the display settings. I am also unable to change the wallpaper. Here's what it looks like: Synaptic: Chromium and this is the wallpaper page even though I have selected the wallpaper, it actually does not change. This same problem occurred on my personal computer, and one other computer I have, all running the same software/config. The interesting thing is that while Gnome 3 and Unity are affected, Cinnamon is not. What I've done so far: purged and re-installed both gnome 3 and Unity- no change noted. So, how do I fix this? Thanks Here's the installation log: Start-Date: 2013-11-07 12:01:28 Upgrade: chromium-browser-l10n:i386 (28.0.1500.71-0ubuntu1.12.04.1, 30.0.1599.114-0ubuntu0.12.04.3), libswscale2:i386 (0.8.6-0ubuntu0.12.04.1, 0.8.8-0ubuntu0.12.04.1), chromium-codecs-ffmpeg:i386 (28.0.1500.71-0ubuntu1.12.04.1, 30.0.1599.114-0ubuntu0.12.04.3), chromium-browser:i386 (28.0.1500.71-0ubuntu1.12.04.1, 30.0.1599.114-0ubuntu0.12.04.3), libpostproc52:i386 (0.8.6-0ubuntu0.12.04.1, 0.8.8-0ubuntu0.12.04.1), libavcodec-extra-53:i386 (0.8.6ubuntu0.12.04.1, 0.8.8ubuntu0.12.04.1), libavformat53:i386 (0.8.6-0ubuntu0.12.04.1, 0.8.8-0ubuntu0.12.04.1), libavutil-extra-51:i386 (0.8.6ubuntu0.12.04.1, 0.8.8ubuntu0.12.04.1) End-Date: 2013-11-07 12:02:00 Start-Date: 2013-11-07 17:32:55 Commandline: aptdaemon role='role-commit-packages' sender=':1.136' Install: libmusicbrainz5-0:i386 (5.0.1-2~precise2), udisks2:i386 (1.98.0-1~precise1), libclutter-gst-1.0-0:i386 (1.5.4-0ubuntu2), libudisks2-0:i386 (1.98.0-1~precise1), cinnamon-session-common:i386 (2.0.4-20131105043005-precise), librhythmbox-core6:i386 (2.97-1ubuntu1~precise1), gcr:i386 (3.4.1-3~precise1), libcluttergesture-0.0.2-0:i386 (0.0.2.1-2ubuntu3), libmx-1.0-2:i386 (1.4.3-0ubuntu1), guile-2.0-libs:i386 (2.0.5+1-1), libclutter-imcontext-0.1-0:i386 (0.1.4-2build1), libnatpmp1:i386 (20110808-3ubuntu1) Upgrade: gnome-keyring:i386 (3.2.2-2ubuntu4.1, 3.4.1-4ubuntu1~precise1), cinnamon:i386 (2.0.6-20131026040307-precise, 2.0.10-20131105040309-precise), gir1.2-muffin-3.0:i386 (2.0.3-20131023003029-precise, 2.0.3-20131105003012-precise), gir1.2-totem-1.0:i386 (3.0.1-0ubuntu21.1, 3.4.3-0ubuntu1~precise1), nemo:i386 (2.0.2-20131023010018-precise, 2.0.5-20131105010007-precise), aisleriot:i386 (3.2.3.2-0ubuntu1, 3.4.1-1~precise1), procps:i386 (3.2.8-11ubuntu6.2, 3.2.8-11ubuntu6.3), libcinnamon-desktop0:i386 (2.0.2-20131025011504-precise, 2.0.3-20131105011505-precise), libgck-1-0:i386 (3.2.2-2ubuntu4.1, 3.4.1-3~precise1), totem-plugins:i386 (3.0.1-0ubuntu21.1, 3.4.3-0ubuntu1~precise1), cinnamon-desktop-data:i386 (2.0.2-20131025011504-precise, 2.0.3-20131105011505-precise), rhythmbox:i386 (2.96-0ubuntu4.3, 2.97-1ubuntu1~precise1), libgcr-3-1:i386 (3.2.2-2ubuntu4.1, 3.4.1-3~precise1), seahorse:i386 (3.2.2-0ubuntu2.1, 3.4.1-2~precise1), muffin-common:i386 (2.0.3-20131023003029-precise, 2.0.3-20131105003012-precise), totem-common:i386 (3.0.1-0ubuntu21.1, 3.4.3-0ubuntu1~precise1), libtotem0:i386 (3.0.1-0ubuntu21.1, 3.4.3-0ubuntu1~precise1), rhythmbox-data:i386 (2.96-0ubuntu4.3, 2.97-1ubuntu1~precise1), gir1.2-cinnamondesktop-3.0:i386 (2.0.2-20131025011504-precise, 2.0.3-20131105011505-precise), cinnamon-session:i386 (2.0.1-20131021043004-precise, 2.0.4-20131105043005-precise), rhythmbox-mozilla:i386 (2.96-0ubuntu4.3, 2.97-1ubuntu1~precise1), rhythmbox-plugin-zeitgeist:i386 (2.96-0ubuntu4.3, 2.97-1ubuntu1~precise1), libmuffin0:i386 (2.0.3-20131023003029-precise, 2.0.3-20131105003012-precise), cjs:i386 (2.0.0-20131021020602-precise, 2.0.0-20131105020703-precise), rhythmbox-plugin-cdrecorder:i386 (2.96-0ubuntu4.3, 2.97-1ubuntu1~precise1), cinnamon-common:i386 (2.0.6-20131026040307-precise, 2.0.10-20131105040309-precise), gnome-disk-utility:i386 (3.0.2-2ubuntu7, 3.4.1-0ubuntu1~precise1), nemo-fileroller:i386 (2.0.0-20131021020004-precise, 2.0.0-20131105020003-precise), libnemo-extension1:i386 (2.0.2-20131023010018-precise, 2.0.5-20131105010007-precise), rhythmbox-plugins:i386 (2.96-0ubuntu4.3, 2.97-1ubuntu1~precise1), gimp:i386 (2.8.6-0precise1~ppa, 2.8.8-0precise0~ppa), cinnamon-settings-daemon:i386 (2.0.5-20131026004504-precise, 2.0.6-20131105004505-precise), libgimp2.0:i386 (2.8.6-0precise1~ppa, 2.8.8-0precise0~ppa), gir1.2-rb-3.0:i386 (2.96-0ubuntu4.3, 2.97-1ubuntu1~precise1), wpasupplicant:i386 (0.7.3-6ubuntu2.1, 0.7.3-6ubuntu2.2), libcjs0c:i386 (2.0.0-20131021020602-precise, 2.0.0-20131105020703-precise), nemo-data:i386 (2.0.2-20131023010018-precise, 2.0.5-20131105010007-precise), totem:i386 (3.0.1-0ubuntu21.1, 3.4.3-0ubuntu1~precise1), gimp-data:i386 (2.8.6-0precise1~ppa, 2.8.8-0precise0~ppa), transmission-common:i386 (2.51-0ubuntu1.3, 2.73-0ubuntu1~precise1), cinnamon-translations:i386 (2.0.1-20131021040407-precise, 2.0.1-20131105040807-precise), totem-mozilla:i386 (3.0.1-0ubuntu21.1, 3.4.3-0ubuntu1~precise1), rhythmbox-plugin-magnatune:i386 (2.96-0ubuntu4.3, 2.97-1ubuntu1~precise1), transmission-gtk:i386 (2.51-0ubuntu1.3, 2.73-0ubuntu1~precise1) End-Date: 2013-11-07 17:34:40

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• Google page events monitoring and analysis

  - by Homunculus Reticulli

  I have read the Google page event documentation, but I am not sure I understand it correctly. I am new to Google analytics, and I have two questions: Once I have google analytics enabled for my site (i.e. I have inserted the tracking code in my pages etc), do I need to set anything else up (at the Google end - i.e. in my Google analytics account) It is not clear to me how the event data particularly, relating to how the data can be aggregated and analyzed. For instance, if I want to track an event under category category for click action action, I will use the following code snippet: <a href="some-uri.htm" onclick="_gaq.push(['_trackEvent', 'category', 'action', 'label']);">Do Something</a> For the sake of simplicity, lets say I am interested in monitoring click events in my header and footer, and I want to find which pages the header and or footer is clicked most often. How would I set things up so that I can analyze the header/footer clicks aggregated at the page level?

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• Business Insight, IT Execution: 9 Project Management Tips

  - by Sylvie MacKenzie, PMP

  Excerpt from Profit Magazine - by David Rosenbaum When Marcos Baccetto was first asked to be the business-side project lead on Eaton Corporation’s Vehicle Group South America (VGSA) Oracle project, the operations services manager responsible for running manufacturing was, he confesses, “a little afraid” because of his lack of IT experience. Today, Baccetto calls the project “a fantastic experience,” and he is a true believer in the benefits of a close relationship between IT implementers and their line-of-business peers. Through his partnership with Jesiele Lima, then VGSA IT manager, Baccetto and Eaton’s South American operations team came to understand several important principles of business and IT. Here he shares nine tips managers should consider when working on an enterprise technology project. 1. Make it a business project, not an IT project. All levels of functional management must have ownership, responsibility, and accountability for the success of the implementation. 2. Share responsibility. Business owners should sign off on tests and data conversion. 3. Clean your data. Dedicating a team to improve core data quality prior to project launch can be a significant time-saver. 4. Select resources properly. Have functional people who can translate business needs to IT and can influence organizational change. 5. Manage scope. Follow project management methodologies and disciplines. 6. Adopt common processes, global solutions. Avoid customized, local solutions. The big-picture business goals can get lost in the details. 7. Implement processes prior to the go-live date. Change management can be key. Keep the workforce informed and train users in advance. 8. Define metrics milestones. Assume there will be a crisis during deployment. Having baseline metrics to compare against will help implementers keep their cool—and the project moving forward. 9. The sponsor’s commitment is critical. It is needed to support the truly difficult decisions.

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• Ask the Readers: How Do You Browse Securely Away From Home?

  - by Jason Fitzpatrick

  When you’re browsing away from home, be it on your smartphone, tablet, or laptop, how do you keep your browsing sessions secure? This week we’re interested in hearing all about your mobile security tips and tricks. When you’re out and about you often, out of necessity or convenience, need to connect to open Wi-Fi hotspots and otherwise put your data out there in ways that you don’t when you’re at home. This week we want to hear about your tips, tricks, and applications for keeping your data secure and private when you’re away from your home network. Sound off in the comments with your tips and then check back on Friday for the What You Said roundup. HTG Explains: Why Linux Doesn’t Need Defragmenting How to Convert News Feeds to Ebooks with Calibre How To Customize Your Wallpaper with Google Image Searches, RSS Feeds, and More

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• OpenID implementation - PHP, Javascript, MySQL

  - by Marc A.

  Hello, I've started doing some research on the technologies that I will need for my website. I'm trying to implement a really simple website with OpenID user registration. The website will store a block of text for each user. I imagine this means that I will need a database with: User ID Open ID url Data Having said that, I'm still having trouble deciding what I really need to do this. I know that I will need the following for the actual site: Javascript JQuery CSS But on the back end, I'm kind of lost at the moment. I've been looking at the OpenID-Selector, which is coded in Javascript. It seems like it's exactly what is used on this site. Will I actually need PHP? MySQL for the data and user registration? Thanks for the kickstart!

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• Catching Up with Lisp

  Support for multicore and Big Data are among the upcoming features of Franz's Lisp-based tools Lisp - Programming - Languages - FAQs Help and Tutorials - Compilers and Interpreters

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• In which object should I implement wait()/notify()?

  - by Christopher Francisco

  I'm working in an Android project with multithreading. Basically I have to wait to the server to respond before sending more data. The data sending task is delimited by the flag boolean hasServerResponded so the Thread will loop infinitely without doing anything until the flag becomes true. Since this boolean isn't declared as volatile (yet), and also looping without doing anything wastes resources, I thought maybe I should use AtomicBoolean and also implement wait() / notify() mechanism. Should I use the AtomicBoolean object notify() and wait() methods or should I create a lock Object?

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• What is a correct step by step logic of exporting scene with baked occlusion for loading it at runtime?

  - by myWallJSON

  I wonder what is a correct step by step logic of exporting scene with baked occlusion (Culling data) for loading that scene at runtime (on fly from the internet for example))? So currently my plan looks like this: I create prefabs Place them onto my scene (into Hierarchy) (say create 20 buffolows and some hourses and some buildings) Create empty prefab and drag all my scene objects from hierarchy onto it Export prefab So generally I put all my scene objects into one large prefab and export it but it seems that all objects that were marked as static get this property turned off when loading them at runtime and so no Frustrum Culling, and no Occlusion culling happens. So I wonder what is a correct way of exporting Sceen + Objecrts + Occlusion (and onther culing) data for future load of such scene at runtime? I wonder about current 3.5.2 Pro and future 4 Pro versions of U3D.

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• Iron Mountain Readies for New Federal Records Rule

  New rules requiring that federal records be kept secure and readily available could mean more compliance business for data storage vendors.

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• Subterranean IL: The ThreadLocal type

  - by Simon Cooper

  I came across ThreadLocal<T> while I was researching ConcurrentBag. To look at it, it doesn't really make much sense. What's all those extra Cn classes doing in there? Why is there a GenericHolder<T,U,V,W> class? What's going on? However, digging deeper, it's a rather ingenious solution to a tricky problem. Thread statics Declaring that a variable is thread static, that is, values assigned and read from the field is specific to the thread doing the reading, is quite easy in .NET: [ThreadStatic] private static string s_ThreadStaticField; ThreadStaticAttribute is not a pseudo-custom attribute; it is compiled as a normal attribute, but the CLR has in-built magic, activated by that attribute, to redirect accesses to the field based on the executing thread's identity. TheadStaticAttribute provides a simple solution when you want to use a single field as thread-static. What if you want to create an arbitary number of thread static variables at runtime? Thread-static fields can only be declared, and are fixed, at compile time. Prior to .NET 4, you only had one solution - thread local data slots. This is a lesser-known function of Thread that has existed since .NET 1.1: LocalDataStoreSlot threadSlot = Thread.AllocateNamedDataSlot("slot1"); string value = "foo"; Thread.SetData(threadSlot, value); string gettedValue = (string)Thread.GetData(threadSlot); Each instance of LocalStoreDataSlot mediates access to a single slot, and each slot acts like a separate thread-static field. As you can see, using thread data slots is quite cumbersome. You need to keep track of LocalDataStoreSlot objects, it's not obvious how instances of LocalDataStoreSlot correspond to individual thread-static variables, and it's not type safe. It's also relatively slow and complicated; the internal implementation consists of a whole series of classes hanging off a single thread-static field in Thread itself, using various arrays, lists, and locks for synchronization. ThreadLocal<T> is far simpler and easier to use. ThreadLocal ThreadLocal provides an abstraction around thread-static fields that allows it to be used just like any other class; it can be used as a replacement for a thread-static field, it can be used in a List<ThreadLocal<T>>, you can create as many as you need at runtime. So what does it do? It can't just have an instance-specific thread-static field, because thread-static fields have to be declared as static, and so shared between all instances of the declaring type. There's something else going on here. The values stored in instances of ThreadLocal<T> are stored in instantiations of the GenericHolder<T,U,V,W> class, which contains a single ThreadStatic field (s_value) to store the actual value. This class is then instantiated with various combinations of the Cn types for generic arguments. In .NET, each separate instantiation of a generic type has its own static state. For example, GenericHolder<int,C0,C1,C2> has a completely separate s_value field to GenericHolder<int,C1,C14,C1>. This feature is (ab)used by ThreadLocal to emulate instance thread-static fields. Every time an instance of ThreadLocal is constructed, it is assigned a unique number from the static s_currentTypeId field using Interlocked.Increment, in the FindNextTypeIndex method. The hexadecimal representation of that number then defines the specific Cn types that instantiates the GenericHolder class. That instantiation is therefore 'owned' by that instance of ThreadLocal. This gives each instance of ThreadLocal its own ThreadStatic field through a specific unique instantiation of the GenericHolder class. Although GenericHolder has four type variables, the first one is always instantiated to the type stored in the ThreadLocal<T>. This gives three free type variables, each of which can be instantiated to one of 16 types (C0 to C15). This puts an upper limit of 4096 (163) on the number of ThreadLocal<T> instances that can be created for each value of T. That is, there can be a maximum of 4096 instances of ThreadLocal<string>, and separately a maximum of 4096 instances of ThreadLocal<object>, etc. However, there is an upper limit of 16384 enforced on the total number of ThreadLocal instances in the AppDomain. This is to stop too much memory being used by thousands of instantiations of GenericHolder<T,U,V,W>, as once a type is loaded into an AppDomain it cannot be unloaded, and will continue to sit there taking up memory until the AppDomain is unloaded. The total number of ThreadLocal instances created is tracked by the ThreadLocalGlobalCounter class. So what happens when either limit is reached? Firstly, to try and stop this limit being reached, it recycles GenericHolder type indexes of ThreadLocal instances that get disposed using the s_availableIndices concurrent stack. This allows GenericHolder instantiations of disposed ThreadLocal instances to be re-used. But if there aren't any available instantiations, then ThreadLocal falls back on a standard thread local slot using TLSHolder. This makes it very important to dispose of your ThreadLocal instances if you'll be using lots of them, so the type instantiations can be recycled. The previous way of creating arbitary thread-static variables, thread data slots, was slow, clunky, and hard to use. In comparison, ThreadLocal can be used just like any other type, and each instance appears from the outside to be a non-static thread-static variable. It does this by using the CLR type system to assign each instance of ThreadLocal its own instantiated type containing a thread-static field, and so delegating a lot of the bookkeeping that thread data slots had to do to the CLR type system itself! That's a very clever use of the CLR type system.

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