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  • Udacity: Teaching thousands of students to program online using App Engine

    Udacity: Teaching thousands of students to program online using App Engine Join Fred Sauer & Iein Valdez as they talk with Steve Huffman, founder of Reddit and Hipmunk, and Chris Chew, senior software engineer at Udacity. Steve will share his experience teaching a course on web development using App Engine at Udacity, and Chris will talk about his experience building Udacity itself using App Engine. Submit your questions for Steve and Chris to answer live on air. From: GoogleDevelopers Views: 0 0 ratings Time: 00:00 More in Science & Technology

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  • Google Chrome Extensions: Launch Event (part 6)

    Google Chrome Extensions: Launch Event (part 6) Video Footage from the Google Chrome Extensions launch event on 12/09/09. Nick Baum, product manager for Google Chrome's extension system presents the gallery approval process, gives tips to extensions developers on how to make their extension successful and discusses the team's short term plans. From: GoogleDevelopers Views: 5659 17 ratings Time: 08:42 More in Science & Technology

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  • Google Annotations Gallery

    The Google Annotations Gallery is an exciting new Java open source library that provides a rich set of annotations for developers to express themselves. Do you find the...

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  • Throwing exception from a property when my object state is invalid

    - by Rumi P.
    Microsoft guidelines say: "Avoid throwing exceptions from property getters", and I normally follow that. But my application uses Linq2SQL, and there is the case where my object can be in invalid state because somebody or something wrote nonsense into the database. Consider this toy example: [Table(Name="Rectangle")] public class Rectangle { [Column(Name="ID", IsPrimaryKey = true, IsDbGenerated = true)] public int ID {get; set;} [Column(Name="firstSide")] public double firstSide {get; set;} [Column(Name="secondSide")] public double secondSide {get; set;} public double sideRatio { get { return firstSide/secondSide; } } } Here, I could write code which ensures that my application never writes a Rectangle with a zero-length side into the database. But no matter how bulletproof I make my own code, somebody could open the database with a different application and create an invalid Rectangle, especially one with a 0 for secondSide. (For this example, please forget that it is possible to design the database in a way such that writing a side length of zero into the rectangle table is impossible; my domain model is very complex and there are constraints on model state which cannot be expressed in a relational database). So, the solution I am gravitating to is to change the getter to: get { if(firstSide > 0 && secondSide > 0) return firstSide/secondSide; else throw new System.InvalidOperationException("All rectangle sides should have a positive length"); } The reasoning behind not throwing exceptions from properties is that programmers should be able to use them without having to make precautions about catching and handling them them. But in this case, I think that it is OK to continue to use this property without such precautions: if the exception is thrown because my application wrote a non-zero rectangle side into the database, then this is a serious bug. It cannot and shouldn't be handled in the application, but there should be code which prevents it. It is good that the exception is visibly thrown, because that way the bug is caught. if the exception is thrown because a different application changed the data in the database, then handling it is outside of the scope of my application. So I can't do anything about it if I catch it. Is this a good enough reasoning to get over the "avoid" part of the guideline and throw the exception? Or should I turn it into a method after all? Note that in the real code, the properties which can have an invalid state feel less like the result of a calculation, so they are "natural" properties, not methods.

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  • Why is my google translate data not showing up in analytics?

    - by learnvst
    I have a google translate widget on my website with gaTrack set to true and the correct gaId, but no translate events show up in analytics under content Events Overview after a week of the widget being live. The code snippet below was auto generated by the translate website, and works fine on the site. Any ideas why I'm not getting any translate events data? <li> <div id="google_translate_element"></div><script type="text/javascript"> function googleTranslateElementInit() { new google.translate.TranslateElement({pageLanguage: 'en', layout: google.translate.TranslateElement.InlineLayout.SIMPLE, gaTrack: true, gaId: 'UA-blahblah'}, 'google_translate_element'); } </script><script type="text/javascript" src="//translate.google.com/translate_a/element.js?cb=googleTranslateElementInit"></script> </li>

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  • Why does my application hang in interruptible state?

    - by Greg
    Hello, I am running on Ubuntu 10.04 LTS Server an GTK application that used to work fine. It suddenly started to hang in interruptible state (Sl+) without any apparent reason. Here is a snippet of the strace: poll([{fd=3, events=POLLIN}, {fd=5, events=POLLIN}], 2, 0) = 0 (Timeout) poll([{fd=5, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=5, revents=POLLOUT}]) writev(5, [{"\2\30\4\0\224\4\240\0\0@\0\0\37\0\240\0\2\4\4\0\224\4\240\0\0@\0\0\37\0\240\0"..., 192}, {NULL, 0}, {"", 0}], 3) = 192 read(5, 0x2ba9ac4, 4096) = -1 EAGAIN (Resource temporarily unavailable) I googled that line read(5, 0x2ba9ac4, 4096), which seems to be more significant, and it seems that many other applications tend to have the same problem. I tried to restart my X server, but it didn't help. Do you have an idea how to solve this problem?

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  • How do I tell the cases when it's worth to use LINQ?

    - by Lijo
    Many things in LINQ can be accomplished without the library. But for some scenarios, LINQ is most appropriate. Examples are: SELECT - http://stackoverflow.com/questions/11883262/wrapping-list-items-inside-div-in-a-repeater SelectMany, Contains - http://stackoverflow.com/questions/11778979/better-code-pattern-for-checking-existence-of-value Enumerable.Range - http://stackoverflow.com/questions/11780128/scalable-c-sharp-code-for-creating-array-from-config-file WHERE http://stackoverflow.com/questions/13171850/trim-string-if-a-string-ends-with-a-specific-word What factors to take into account when deciding between LINQ and regular .Net language elements?

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  • Google I/O 2012 - What's New in Google Maps

    Google I/O 2012 - What's New in Google Maps Brian McClendon, Dylan Lorimer, Thor Mitchell There is a lot of exciting things happening in the world of Maps at Google. Come and join us as we kick off the Maps track at Google I/O 2012 with a dive into the cutting edge of online maps with Google's Vice President of Google Maps and Earth, Brian McClendon, For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 4780 54 ratings Time: 51:32 More in Science & Technology

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  • Is it possible to use Google Analytics to track file downloads?

    - by Eric Falsken
    It's always bothered me that Google Analytics (and similar embedded web traffic monitoring services) can only see a reflection of the traffic going to my server and can only see page visits since it depends on the browser executing a Javascript snippet. If I want to track real downloads of a software package (ZIP file), there's no way Google Analytics can possibly tell me that because its javascript can't be attached to a ZIP file. Is there a way I can upload my log files to Google so that the pointy-haired boss can see downloads of our ZIP/PDF/BIN files and not just visits to the download page?

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  • Getting problem in removing end slash from directory

    - by user2615947
    this is my code but i tried many ways but it is not working and i am not able to remove the end slash from the directory RewriteEngine On RewriteBase / # remove enter code here.php; use THE_REQUEST to prevent infinite loops RewriteCond %{THE_REQUEST} ^GET\ (.*)\.php\ HTTP RewriteRule (.*)\.php$ $1 [R=301] # remove index RewriteRule (.*)/index$ $1/ [R=301] # remove slash if not directory RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_URI} /$ RewriteRule (.*)/ $1 [R=301] # add .php to access file, but don't redirect RewriteCond %{REQUEST_FILENAME}.php -f RewriteCond %{REQUEST_URI} !/$ RewriteRule (.*) $1\.php [L] # Remove trailing slashes RewriteRule ^(.*)\/(\?.*)?$ $1$2 [R=301,L] Thanks

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  • Google I/O 2012 - Google Cloud Messaging for Android

    Google I/O 2012 - Google Cloud Messaging for Android Francesco Nerieri Cloud-to-device-messaging (C2DM) is coming out of beta and getting a new name: Google Cloud Messaging for Android. GCM for Android incorporates the lessons we learned in the C2DM beta, many of which take the form of new features. This session will cover the new service end-to-end and in detail. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 419 11 ratings Time: 52:11 More in Science & Technology

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  • Google I/O Sandbox Case Study: Apps4Android

    Google I/O Sandbox Case Study: Apps4Android We interviewed Apps4Android at the Google I/O Sandbox on May 11, 2011 and they explained to us the benefits of building accessibility applications on the Android platform. Apps4Android creates high-quality applications that enhance the quality-of-life and independence of individuals with disabilities. For more information about developing accessibility applications, visit: google.com For more information on Apps4Android, visit: www.apps4android.org From: GoogleDevelopers Views: 26 0 ratings Time: 02:01 More in Science & Technology

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  • More Blogginess

    Hello everyone, and welcome to a rare (in this space) blog about blogging. My name is Tim Bray, and I’m the new editor of this Android Developers’ Blog...

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