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  • Google+ Platform Office Hours for February 1st 2012

    Google+ Platform Office Hours for February 1st 2012 Jenny Murphy and Jonathan Beri represented Google. Fraser Cain, Abraham Williams and Allen Firstenberg joined us from the developer community. This week we discussed the new configuration options for the Google+ Badge. You can read more about these new features on the platform blog: googleplusplatform.blogspot.com Please join the discussion on our support forum: groups.google.com Learn more about our office hours on Google Developers: developers.google.com From: GoogleDevelopers Views: 4150 55 ratings Time: 47:51 More in Science & Technology

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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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  • SQLSaturday #69 - Philly Love

    - by Mike C
    Thanks to the Philly SQL Server User Group (PSSUG) and to everyone who attended SQLSaturday #69 in the City of Brotherly Love yesterday. It was a great event with a lot of great people. My presentations are available for download at the links below: http://www.sqlsaturday.com/viewsession.aspx?sat=69&sessionid=3333 http://www.sqlsaturday.com/viewsession.aspx?sat=69&sessionid=3334 I just went through my speaker evaluations, and I'm happy to report the response was pretty positive across the...(read more)

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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 I/O 2012 - Empowering your Workforce with Google Maps

    Google I/O 2012 - Empowering your Workforce with Google Maps Dave Day, David Owens One of the most difficult problems managing your business is figuring out where everything is, be it employees, deliveries, or equipment. In this session we will show you how you can use Google technology to manage all of the assets of your business, and make sure everything is in the right place, at the right time. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 2289 36 ratings Time: 43:38 More in Science & Technology

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  • Interconnect nodes in a Java distributed infrastructure for tweet processing

    - by David Moreno García
    I'm working in a new version of an old project that I used to download and process user statuses from Twitter. The main problem of that project was its infrastructure. I used multiple instances of a java application (trackers) to download from Twitter given an specific task (basically terms to search for), connected with a central node (a web application) that had to process all tweets once per day and generate a new task for each trackers once each 15 minutes. The central node also had to monitor all trackers and enable/disable them under user petition. This, as I said, was too slow because I had multiple bottlenecks, so in this new version I want to improve the infrastructure and isolate all functionalities in specific nodes. I also need a good notification system to receive notifications for any node. So, in the next diagram I show the components that I'll need in this new version: As you can see, there are more nodes. Here are some notes about them: Dashboard: Controls trackers statuses and send a single task to each of them (under user request). The trackers will use this task until replaced with a new one (if done, not each 15 minutes like before). Search engine: I need to store all the tweets. They are firstly stored in a local database for each tracker but after that I'm thinking on using something like Elasticsearch to be able to do fast searches. Tweet processor: Just and isolated component with its own database (maybe something like the search engine to have fast access to info generated by the module). In the future more could be added. Application UI: A web application with a shared database with the Dashboard (mainly to store users information and preferences). Indeed, both could be merged into a single web. The main difference with the previous version of the project is that now they will be isolated and they will only show information and send requests. I will not do any heavy task in them (like process tweets as I did before). So, having this components, my main headache is how to structure all to not have to rewrite a lot of code every time I need to access any new data. Another headache is how can I interconnect nodes. I could use sockets but that is a pain in the ass. Maybe a REST layer? And finally, if all the nodes are isolated, how could I generate notifications for each user which info is only in the database used by the Application UI? I'm programming this using Java and Spring (at least I used them in the last version) but I have no problems with changing the language if I can take advantage of a tool/library/engine to make my life easier and have a better platform. Any comment will be appreciated.

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  • Automate Your Google Analytics Reporting with Apps Script

    Automate Your Google Analytics Reporting with Apps Script Do you rely on Google Analytics reporting to make sure you're making the most of your web traffic? Does your current process for exporting and analyzing your Analytics data feel clunky? Join Nick Mihailovski and Ikai Lan from the Analytics and Apps Script teams to learn how to integrate Google Analytics with Apps Script and save your sanity in the process. From: GoogleDevelopers Views: 0 2 ratings Time: 30:00 More in Science & Technology

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  • Obtaining positional information in the IEnumerable Select extension method

    - by Kyle Burns
    This blog entry is intended to provide a narrow and brief look into a way to use the Select extension method that I had until recently overlooked. Every developer who is using IEnumerable extension methods to work with data has been exposed to the Select extension method, because it is a pretty critical piece of almost every query over a collection of objects.  The method is defined on type IEnumerable and takes as its argument a function that accepts an item from the collection and returns an object which will be an item within the returned collection.  This allows you to perform transformations on the source collection.  A somewhat contrived example would be the following code that transforms a collection of strings into a collection of anonymous objects: 1: var media = new[] {"book", "cd", "tape"}; 2: var transformed = media.Select( item => 3: { 4: Media = item 5: } ); This code transforms the array of strings into a collection of objects which each have a string property called Media. If every developer using the LINQ extension methods already knows this, why am I blogging about it?  I’m blogging about it because the method has another overload that I hadn’t seen before I needed it a few weeks back and I thought I would share a little about it with whoever happens upon my blog.  In the other overload, the function defined in the first overload as: 1: Func<TSource, TResult> is instead defined as: 1: Func<TSource, int, TResult>   The additional parameter is an integer representing the current element’s position in the enumerable sequence.  I used this information in what I thought was a pretty cool way to compare collections and I’ll probably blog about that sometime in the near future, but for now we’ll continue with the contrived example I’ve already started to keep things simple and show how this works.  The following code sample shows how the positional information could be used in an alternating color scenario.  I’m using a foreach loop because IEnumerable doesn’t have a ForEach extension, but many libraries do add the ForEach extension to IEnumerable so you can update the code if you’re using one of these libraries or have created your own. 1: var media = new[] {"book", "cd", "tape"}; 2: foreach (var result in media.Select( 3: (item, index) => 4: new { Item = item, Index = index })) 5: { 6: Console.ForegroundColor = result.Index % 2 == 0 7: ? ConsoleColor.Blue : ConsoleColor.Yellow; 8: Console.WriteLine(result.Item); 9: }

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  • WSE ServiceBus

    The article describes a design and implementation of the logical connectivity driven by the config Knowledge Base and the WSE2 Messaging.

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  • Apps Script Office Hours - October 4, 2012

    Apps Script Office Hours - October 4, 2012 Eric and Arun host another episode of Apps Script Office Hours. In this week's installment: - Arun talks about presenting Apps Script at the Washington DC DevFest. - They discuss the upcoming hackathon in Los Angeles (goo.gl - They answer questions about geolocation, security, ScriptDb, and shared contact management in Apps Script. For a schedule of future episodes visit developers.google.com From: GoogleDevelopers Views: 61 0 ratings Time: 24:34 More in Science & Technology

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  • February 2011 Java SE and Java for Business Critical Patch Update Released

    - by eric.maurice
    Hello, this is Eric Maurice again. Oracle released the February 2011 Critical Patch Update for Java SE and Java for Business today. As discussed in a previous blog entry, Oracle currently maintains a separate Critical Patch Update schedule for Java SE and Java for Business because of commitments made prior to the Oracle acquisition in regards to the timing for the publication of Java fixes. Today's Java Critical Patch Update includes fixes for 21 vulnerabilities. The most severe CVSS Base Score for vulnerabilities fixed in this CPU is 10.0, and this Base Score affects 8 vulnerabilities. Out of these 21 vulnerabilities, 13 affect Java client deployments. 12 of these 13 vulnerabilities can be exploited through Untrusted Java Web Start applications and Untrusted Java Applets, which run in the Java sandbox with limited privileges. One of these 13 vulnerabilities can be exploited by running a standalone application. In addition, one of the client vulnerability affects Java Update, a Windows-specific component. 3 of the 21 vulnerabilities affect client and server deployments. These vulnerabilities can be exploited through Untrusted Java Web Start applications and Untrusted Java Applets, as well as be exploited by supplying malicious data to APIs in the specified components, such as, for example, through a web service. 3 vulnerabilities affect Java server deployments only. These vulnerabilities can be exploited by supplying malicious data to APIs in the specified Java components. Note that one of these vulnerabilities (CVE-2010-4476) was the subject of a Security Alert released on February 8th. Finally, one of these vulnerabilities is specific to Java DB, a component in the Java JDK, but not included in the Java Runtime Environment (JRE). As usual, because of the severity of the vulnerabilities fixed in this Critical Patch Update, Oracle recommends that Java customers apply it as soon as possible. The Critical Patch Advisory provides more details about the vulnerabilities addressed in the Critical Patch Update as well as instructions on how to install the fixes and where to get them. Home users should use the Java auto-update mechanism to install the latest version of the Java Runtime Environment 6 update 24 or higher (JRE), which includes the fix for this vulnerability. For More Information: The Critical Patch Updates and Security Alerts page is located at http://www.oracle.com/technetwork/topics/security/alerts-086861.html More information on Oracle Software Security Assurance is located at http://www.oracle.com/us/support/assurance/index.html Consumers can go to http://www.java.com/en/download/installed.jsp to ensure that they have the latest version of Java running on their desktops. More information on Java Update is available at http://www.java.com/en/download/help/java_update.xml

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  • Xml Literals

    XML Literals allow you to use XML syntax in your code. Its easy to work with XML files this way, since you have that Tags in the code, but its also quicker to access information rather then the traditional methods....Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Apps Script Office Hours - September 13, 2012

    Apps Script Office Hours - September 13, 2012 In this week's episode of Google Apps Script office hours, Jan and Arun: - Introduce the Google Apps Script app that was recently published in the Chrome Web Store: chrome.google.com - Answer a variety of questions from the Google Moderator. - Answer live questions about UiApp, triggers, ScriptDb, and other topics. To find out when the next office hours will be held, visit developers.google.com From: GoogleDevelopers Views: 221 7 ratings Time: 17:26 More in Science & Technology

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  • Installing Microsoft Atlanta

    - by John Paul Cook
    Since my previous post on Microsoft Atlanta, I've been asked how someone can get started with it. Go to https://www.microsoftatlanta.com/ and click the Create Account button using a Windows Live id such as a Hotmail account. If you don’t have Silverlight installed, you’ll be prompted to install it somewhere along the way. I encourage you to install Atlanta and try it out. The product is still being developed and your early feedback can make a difference. When you click Download Registration Certificate...(read more)

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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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  • Living La Vida LibrePlanet

    The LibrePlanet Conference will be held next week, March 19th-21st, in Cambridge, Massachusetts. The Google Open Source Programs Office's Leslie Hawthorn will be participating in the lively discussions...

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  • SQL Saturday #155 - Lima

    SQL Saturday is exploding in South America, and Lima hosts it's event on Sept 22, 2012. Come join fellow data professionals and learn about SQL Server. Free SQL Server Backup and Restore eBook - get yoursGrab your copy for the complete guide to setting up a reliable, tested backup and restore strategy. Then try SQL Backup Pro to work through the examples. Download free resources.

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  • Visual WebGui's XAML based programming for web developers

    - by Webgui
    While ASP.NET provides an event base approach it is completely dismissed when working with AJAX and the richness of the server is lost and replaced with JavaScript programming and couple with a very high security risk. Visual WebGui reinstates the power of the server to AJAX development and provides a statefull yet scalable, server centric architecture that provides the benefits and user productivity of AJAX with the security and developer productivity we had before AJAX stormed into our lives. "When I first came up with the concept of Visual WebGui , I was frustrated by the fragile and complex nature of developing web applications. The contrast in productivity between working in a fully OOP compiled environment vs. scripting even today, with JQuery, Dojo and such, is still huge. Even today the greatest sponsor of JavaScript programming, Google, is offering a framework to avoid JavaScript using Java that compiles to JavaScript (GWT). So I decided to find a way to abstract the complexity or rather delegate the complex job to enable developers to concentrate on the “What” instead of the “How” and embraced the Form based approach," said Guy Peled the inventor of Visual WebGui. Although traditional OOP development still rules the enterprise, the differences between web sites and web applications have blurred and so did the differences between classic developers and web developers. As a result, we now see declarative languages in desktop / backend development environments (WPF / WF) and we see OOP, gaining more and more power in web development (ASP.NET MVC / ASP.NET DOM). However, what has not changed is enterprise need for security, development ROI, reach, highly responsive and interactive UIs and scalability. The advantages that declarative languages and 'on demand' compilation provide over classic development are mostly the flexibility and a more readable initialize component it offers which is what Gizmox is aspiring to do by replacing the designer initialize component with XAML code. The code in this new project template will be compiled on demand using the build provider mechanism ASP.NET has. This means that the performance hit is only on the first request and after that the performance is the same as a prebuilt solution. This will allow the flexibility of a dynamically updated sites and the power of fully blown enterprise applications over web. You can also use prebuilt features available in ASP.NET to enjoy both worlds in production. VWG XAML implementation (VWG Sites) will be the first truly compliable XAML implementation as Microsoft implemented Silverlight and WPF as a runtime markup interpretation opposed to the ASP.NET markup implementation which is compiled to CLR code once. We have chosen to implement the VWG Sites parser as a different way to create CLR code that provides greater performance over the reflection alternative. VWG Sites will also be the first server side XAML UI engine which, while giving the power of XAML, it will not require any plug-ins or installations on the client side. Short demo video of VWG Sites markup. There is also a live sample available here.

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