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  • Google I/O 2010: Google TV Keynote - Under The Hood

    Google I/O 2010: Google TV Keynote - Under The Hood Due to licensing and permissions issues, we are unable to show the full Google TV demonstration from the Day 2 keynote at Google I/O. Until we are able to get these permissions, please check out these clips. For Google I/O session videos, presentations, developer interviews and more, go to: code.google.com/io From: GoogleDevelopers Views: 3 0 ratings Time: 02:02 More in Science & Technology

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  • Library to fake intermittent failures according to tester-defined policy?

    - by crosstalk
    I'm looking for a library that I can use to help mock a program component that works only intermittently - usually, it works fine, but sometimes it fails. For example, suppose I need to read data from a file, and my program has to avoid crashing or hanging when a read fails due to a disk head crash. I'd like to model that by having a mock data reader function that returns mock data 90% of the time, but hangs or returns garbage otherwise. Or, if I'm stress-testing my full program, I could turn on debugging code in my real data reader module to make it return real data 90% of the time and hang otherwise. Now, obviously, in this particular example I could just code up my mock manually to test against a random() routine. However, I was looking for a system that allows implementing any failure policy I want, including: Fail randomly 10% of the time Succeed 10 times, fail 4 times, repeat Fail semi-randomly, such that one failure tends to be followed by a burst of more failures Any policy the tester wants to define Furthermore, I'd like to be able to change the failure policy at runtime, using either code internal to the program under test, or external knobs or switches (though the latter can be implemented with the former). In pig-Java, I'd envision a FailureFaker interface like so: interface FailureFaker { /** Return true if and only if the mocked operation succeeded. Implementors should override this method with versions consistent with their failure policy. */ public boolean attempt(); } And each failure policy would be a class implementing FailureFaker; for example there would be a PatternFailureFaker that would succeed N times, then fail M times, then repeat, and a AlwaysFailFailureFaker that I'd use temporarily when I need to simulate, say, someone removing the external hard drive my data was on. The policy could then be used (and changed) in my mock object code like so: class MyMockComponent { FailureFaker faker; public void doSomething() { if (faker.attempt()) { // ... } else { throw new RuntimeException(); } } void setFailurePolicy (FailureFaker policy) { this.faker = policy; } } Now, this seems like something that would be part of a mocking library, so I wouldn't be surprised if it's been done before. (In fact, I got the idea from Steve Maguire's Writing Solid Code, where he discusses this exact idea on pages 228-231, saying that such facilities were common in Microsoft code of that early-90's era.) However, I'm only familiar with EasyMock and jMockit for Java, and neither AFAIK have this function, or something similar with different syntax. Hence, the question: Do such libraries as I've described above exist? If they do, where have you found them useful? If you haven't found them useful, why not?

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  • Google I/O 2010: Google TV Keynote - Push Android Apps From Web To TV

    Google I/O 2010: Google TV Keynote - Push Android Apps From Web To TV Due to licensing and permissions issues, we are unable to show the full Google TV demonstration from the Day 2 keynote at Google I/O. Until we are able to get these permissions, please check out these clips. For Google I/O session videos, presentations, developer interviews and more, go to: code.google.com/io From: GoogleDevelopers Views: 1 0 ratings Time: 02:09 More in Science & Technology

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  • Why does glGetString returns a NULL string

    - by snape
    I am trying my hands at GLFW library. I have written a basic program to get OpenGL renderer and vendor string. Here is the code #include <GL/glew.h> #include <GL/glfw.h> #include <cstdio> #include <cstdlib> #include <string> using namespace std; void shutDown(int returnCode) { printf("There was an error in running the code with error %d\n",returnCode); GLenum res = glGetError(); const GLubyte *errString = gluErrorString(res); printf("Error is %s\n", errString); glfwTerminate(); exit(returnCode); } int main() { // start GL context and O/S window using GLFW helper library if (glfwInit() != GL_TRUE) shutDown(1); if (glfwOpenWindow(0, 0, 0, 0, 0, 0, 0, 0, GLFW_WINDOW) != GL_TRUE) shutDown(2); // start GLEW extension handler glewInit(); // get version info const GLubyte* renderer = glGetString (GL_RENDERER); // get renderer string const GLubyte* version = glGetString (GL_VERSION); // version as a string printf("Renderer: %s\n", renderer); printf("OpenGL version supported %s\n", version); // close GL context and any other GLFW resources glfwTerminate(); return 0; } I googled this error and found out that we have to initialize the OpenGL context before calling glGetString(). Although I have initialized OpenGL context using glfwInit() but still the function returns a NULL string. Any ideas? Edit I have updated the code with error checking mechanisms. This code on running outputs the following There was an error in running the code with error 2 Error is no error

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  • Google Python Class Day 1 Part 2

    Google Python Class Day 1 Part 2 Google Python Class Day 1 Part 2: Lists, Sorting, and Tuples. By Nick Parlante. Support materials and exercises: code.google.com From: GoogleDevelopers Views: 13 0 ratings Time: 35:12 More in Science & Technology

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  • Use Oracle Product Hub Business Events to Integrate Additional Logic into Your Business Flows

    - by ToddAC-Oracle
    Business events provide a mechanism to plug-in and integrate some additional business processes or custom code into standard business flows.  You could send a notification to a business User, write to advanced queues or perform some custom processes. In-built business events are available specifically for each flow like Item Creation, Item Updation, User-Defined Attribute Changes, Change Order Creation, Change Order Status Changes and others.To get a list of business events, refer to the PIM implementation Guide or Using Business Events in PLM and PIM Data Librarian (Doc ID 372814.1) .If you are planning to use business events, Doc ID 1074754.1 walks you through a setup with examples. How to Subscribe and Use Product Hub (PIM / APC) Business Events [Video] ? (Doc ID 1074754.1). Review the 'Presentation' section of Doc ID 1074754.1 for complete information and best practices to follow while implementing code for subscriptions. Learn things you might want to avoid, like commit statements for instance. Doc ID 1074754.1 also provides sample code for testing, and can be used to troubleshoot missing setups or frequently experienced issues. Take advantage and run a test ahead of time with the sample code to isolate any issues from within business specific subscription code.Get more out of Oracle Product Hub by using Business Events!

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  • Unit Testing with NUnit and Moles Redux

    - by João Angelo
    Almost two years ago, when Moles was still being packaged alongside Pex, I wrote a post on how to run NUnit tests supporting moled types. A lot has changed since then and Moles is now being distributed independently of Pex, but maintaining support for integration with NUnit and other testing frameworks. For NUnit the support is provided by an addin class library (Microsoft.Moles.NUnit.dll) that you need to reference in your test project so that you can decorate yours tests with the MoledAttribute. The addin DLL must also be placed in the addins folder inside the NUnit installation directory. There is however a downside, since Moles and NUnit follow a different release cycle and the addin DLL must be built against a specific NUnit version, you may find that the release included with the latest version of Moles does not work with your version of NUnit. Fortunately the code for building the NUnit addin is supplied in the archive (moles.samples.zip) that you can found in the Documentation folder inside the Moles installation directory. By rebuilding the addin against your specific version of NUnit you are able to support any version. Also to note that in Moles 0.94.51023.0 the addin code did not support the use of TestCaseAttribute in your moled tests. However, if you need this support, you need to make just a couple of changes. Change the ITestDecorator.Decorate method in the MolesAddin class: Test ITestDecorator.Decorate(Test test, MemberInfo member) { SafeDebug.AssumeNotNull(test, "test"); SafeDebug.AssumeNotNull(member, "member"); bool isTestFixture = true; isTestFixture &= test.IsSuite; isTestFixture &= test.FixtureType != null; bool hasMoledAttribute = true; hasMoledAttribute &= !SafeArray.IsNullOrEmpty( member.GetCustomAttributes(typeof(MoledAttribute), false)); if (!isTestFixture && hasMoledAttribute) { return new MoledTest(test); } return test; } Change the Tests property in the MoledTest class: public override System.Collections.IList Tests { get { if (this.test.Tests == null) { return null; } var moled = new List<Test>(this.test.Tests.Count); foreach (var test in this.test.Tests) { moled.Add(new MoledTest((Test)test)); } return moled; } } Disclaimer: I only tested this implementation against NUnit 2.5.10.11092 version. Finally you just need to run the NUnit console runner through the Moles runner. A quick example follows: moles.runner.exe [Tests.dll] /r:nunit-console.exe /x86 /args:[NUnitArgument1] /args:[NUnitArgument2]

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  • Translating Your Customizations

    - by Richard Bingham
    This blog post explains the basics of translating the customizations you can make to Fusion Applications products, with the inclusion of information for both composer-based customizations and the generic design-time customizations done via JDeveloper. Introduction Like most Oracle Applications, Fusion Applications installs on-premise with a US-English base language that is, in Release 7, supported by the option to add up to a total of 22 additional language packs (In Oracle Cloud production environments languages are pre-installed already). As such many organizations offer their users the option of working with their local language, and logically that should also apply for any customizations as well. Composer-based UI Customizations Customizations made in Page Composer take into consideration the session LOCALE, as set in the user preferences screen, during all customization work, and stores the customization in the MDS repository accordingly. As such the actual new or changed values used will only apply for the same language under which the customization was made, and text for any other languages requires a separate upload. See the Resource Bundles section below, which incidentally also applies to custom UI changes done in JDeveloper. You may have noticed this when you select the “Select Text Resource” menu option when editing the text on a page. Using this ensures that the resource bundles are used, whereas if you define a static value in Expression Builder it will never be available for translation. Notice in the screenshot below the “What’s New” custom value I have already defined using the ‘Select Text Resource’ feature is internally using the adfBundle groovy function to pull the custom value for my key (RT_S_1) from the ComposerOverrideBundle. Figure 1 – Page Composer showing the override bundle being used. Business Objects Customizing the Business Objects available in the Applications Composer tool for the CRM products, such as adding additional fields, also operates using the session language. Translating these additional values for these fields into other installed languages requires loading additional resource bundles, again as described below. Reports and Analytics Most customizations to Reports and BI Analytics are just essentially reorganizations and visualizations of existing number and text data from the system, and as such will use the appropriate values based on the users session language. Where a translated value or string exists for that session language, it will be used without the need for additional work. Extending through the addition of brand new reports and analytics requires another method of loading the translated strings, as part of what is known as ‘Localizing’ the BI Catalog and Metadata. This time it is via an export/import of XML data through the BI Administrators console, and is described in the OBIEE Admin Guide. Fusion Applications reports based on BI Publisher are already defined in template-per-locale, and in addition provide an extra process for getting the data for translation and reloading. This again uses the standard resource bundle format. Loading a custom report is illustrated in this video from our YouTube channel which shows the screen for both setting the template local and running an export for translation. Fusion Applications Menus Whilst the seeded Navigator and Global Menu values are fully translated when the additional language is installed, if they are customized then the change or new menu item will apply universally, not currently per language. This is set to change in a future release with the new UI Text Editor feature described below. More on Resource Bundles As mentioned above, to provide translations for most of your customizations you need to add values to a resource bundle. This is an industry open standard (OASIS) format XML file with the extension .xliff, and store translated values for the strings used by ADF at run-time. The general process is that these values are exported from the MDS repository, manually edited, and then imported back in again.This needs to be done by an administrator, via either WLST commands or through Enterprise Manager as per the screenshot below. This is detailed out in the Fusion Applications Extensibility Guide. For SaaS environments the Cloud Operations team can assist. Figure 2 – Enterprise Manager’s MDS export used getting resource bundles for manual translation and re-imported on the same screen. All customized strings are stored in an override bundle (xliff file) for each locale, suffixed with the language initials, with English ones being saved to the default. As such each language bundle can be easily identified and updated. Similarly if you used JDeveloper to create your own applications as extensions to Fusion Applications you would use the native support for resource bundles, and add them into the faces-config.xml file for inclusion in your application. An example is this ADF customization video from our YouTube channel. JDeveloper also supports automatic synchronization between your underlying resource bundles and any translatable strings you add – very handy. For more information see chapters on “Using Automatic Resource Bundle Integration in JDeveloper” and “Manually Defining Resource Bundles and Locales” in the Oracle Fusion Middleware Web User Interface Developer’s Guide for Oracle Application Development Framework. FND Messages and Look-ups FND Messages, as defined here, are not used for UI labels (they are known as ‘strings’), but are the responses back to users as a result of an action, such as from a page submit. Each ‘message’ is defined and stored in the related database table (FND_MESSAGES_B), with another (FND_MESSAGES_TL) holding any language-specific values. These come seeded with the additional language installs, however if you customize the messages via the “Manage Messages” task in Functional Setup Manager, or add new ones, then currently (in Release 7) you’ll need to repeat it for each language. Figure 3 – An FND Message defined in an English user session. Similarly Look-ups are stored in a translation table (FND_LOOKUP_VALUES_TL) where appropriate, and can be customized by setting the users session language and making the change  in the Setup and Maintenance task entitled “Manage [Standard|Common] Look-ups”. Online Help Yes, in fact all the seeded help is applied as part of each language pack install as part of the post-install provisioning process. If you are editing or adding custom online help then the Create Help screen provides a drop-down of which language your help customization will apply to. This is shown in the video below from our YouTube channel, and obviously you’ll need to it for each language in use. What is Coming for Translations? Currently planned for Release 8 is something called the User Interface (UI) Text Editor. This tool will allow the editing of all the text shown on the pages and forms of Fusion Application. This will provide a search based on a particular term or word, say “Worker”, and will allow it to be adjusted, say to “Employee”, which then updates all the Resource Bundles that contain it. In the case of multi-language environments, it will use the users session language (locale) to know which Resource Bundles to apply the change to. This capability will also support customization sandboxes, to help ensure changes can be tested and approved.  It is also interesting to note that the design currently allows any page-specific customizations done using Page Composer or Application Composer to over-write the global changes done via the UI Text Editor, allowing for special context-sensitive values to still be used. Further Reading and Resources The following short list provides the mains resources for digging into more detail on translation support for both Composer and JDeveloper customization projects. There is a dedicated chapter entitled “Translating Custom Text” in the Fusion Applications Extensibility Guide. This has good examples and steps for many tasks, especially administering resource bundles. Using localization formatting (numbers, dates etc) for design-time changes is well documented in the Fusion Applications Developer Guide. For more guidelines on general design-time globalization, see either the ‘Internationalizing and Localizing Pages’ chapter in the Oracle Fusion Middleware Web User Interface Developer’s Guide for Oracle Application Development Framework (Oracle Fusion Applications Edition) or the general Oracle Database Globalization Support Guide. The Oracle Architecture ‘A-Team’ provided a recent post on customizing the user session timeout popup, using design-time changes to resource bundles. It has detailed step-by-step examples which can be a useful illustration.

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  • Are there web frameworks/tools that optimize for speed of development?

    - by Ahmet Yildirim
    I've been a PHP web developer for about 2 and a half years now. I have started using CodeIgniter framework to shorten development process a while ago. I developed 4 websites using CodeIgniter. It has been really tiring and boring due to code-repetition. Code repetition was vast on form handling functions in controllers.So in my last project , i developed a general form input handling function.This lead a realisation that it could get even faster by more automation. What i think i lack in my development is using CRUD & Code Generation tools. But i am wondering if there is any other utilities that shortens development process. Which web development language or framework more inclined towards code generation utilities?

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  • how to save a gtktextbuffer content in file

    - by user1565593
    i tried to save sengtktextbuffer content in a file. my code seens working but i have a problem in file. some characters are unreadable in outfile outfile my code: def on_save_clicked(self, widget, data=None): start = self.textbuffer.get_start_iter() end = self.textbuffer.get_end_iter() this = self.textbuffer.get_text(start, end, False) format = self.textbuffer.register_serialize_tagset(this) data = self.textbuffer.serialize(self.textbuffer, format, start, end) outfile = open("/home/christophe/toto.txt", "w") outfile.write(data) outfile.close() what is wrong in my code? thanks for your help

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  • Keyword Analysis Tools

    One of the most essential free webmaster tools is to possess a great analytics program. Free website analysis for websites and blogs is vital for success and involves plenty of capabilities, like traffic analysis. Free website analysis must present what pages are usually viewed the most.

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  • Displaying Exceptions Thrown or Caught in Managed Beans

    - by Frank Nimphius
    Just came a cross a sample written by Steve Muench, which somewhere deep in its implementation details uses the following code to route exceptions to the ADF binding layer to be handled by the ADF model error handler (which can be customized by overriding the DCErrorHandlerImpl class and configuring the custom class in DataBindings.cpx file) To route an exception to the ADFm error handler, Steve used the following code ((DCBindingContainer)BindingContext.getCurrent().getCurrentBindingsEntry()).reportException(ex); The same code however can be used in managed beans as well to enforce consistent error handling in ADF. As an example, lets assume a managed bean method hits an exception. To simulate this, let's use the following code: public void onToolBarButtonAction(ActionEvent actionEvent) {    throw new JboException("Just to tease you !!!!!");        } The exception shows at runtime as displayed in the following image: Assuming a try-catch block is used to intercept the exception caused by a managed bean action, you can route the error message display to the ADF model error handler. Again, let's simulate the code that would need to go into a try-catch block public void onToolBarButtonAction(ActionEvent actionEvent) {    JboException ex = new JboException("Just to tease you !!!!!");  BindingContext bctx = BindingContext.getCurrent();    ((DCBindingContainer)bctx.getCurrentBindingsEntry()).reportException(ex); } The error now displays as shown in the image below As you can see, the error is now handled by the ADFm Error handler, which - as mentioned before - could be a custom error handler. Using the ADF model error handling for displaying exceptions thrown in managed beans require the current ADF Faces page to have an associated PageDef file (which is the case if the page or view contains ADF bound components). Note that to invoke methods exposed on the business service it is recommended to always work through the binding layer (method binding) so that in case of an error the ADF model error handler is automatically used.

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  • Bug in Delphi XE RegularExpressions Unit

    - by Jan Goyvaerts
    Using the new RegularExpressions unit in Delphi XE, you can iterate over all the matches that a regex finds in a string like this: procedure TForm1.Button1Click(Sender: TObject); var RegEx: TRegEx; Match: TMatch; begin RegEx := TRegex.Create('\w+'); Match := RegEx.Match('One two three four'); while Match.Success do begin Memo1.Lines.Add(Match.Value); Match := Match.NextMatch; end end; Or you could save yourself two lines of code by using the static TRegEx.Match call: procedure TForm1.Button2Click(Sender: TObject); var Match: TMatch; begin Match := TRegEx.Match('One two three four', '\w+'); while Match.Success do begin Memo1.Lines.Add(Match.Value); Match := Match.NextMatch; end end; Unfortunately, due to a bug in the RegularExpressions unit, the static call doesn’t work. Depending on your exact code, you may get fewer matches or blank matches than you should, or your application may crash with an access violation. The RegularExpressions unit defines TRegEx and TMatch as records. That way you don’t have to explicitly create and destroy them. Internally, TRegEx uses TPerlRegEx to do the heavy lifting. TPerlRegEx is a class that needs to be created and destroyed like any other class. If you look at the TRegEx source code, you’ll notice that it uses an interface to destroy the TPerlRegEx instance when TRegEx goes out of scope. Interfaces are reference counted in Delphi, making them usable for automatic memory management. The bug is that TMatch and TGroupCollection also need the TPerlRegEx instance to do their work. TRegEx passes its TPerlRegEx instance to TMatch and TGroupCollection, but it does not pass the instance of the interface that is responsible for destroying TPerlRegEx. This is not a problem in our first code sample. TRegEx stays in scope until we’re done with TMatch. The interface is destroyed when Button1Click exits. In the second code sample, the static TRegEx.Match call creates a local variable of type TRegEx. This local variable goes out of scope when TRegEx.Match returns. Thus the reference count on the interface reaches zero and TPerlRegEx is destroyed when TRegEx.Match returns. When we call MatchAgain the TMatch record tries to use a TPerlRegEx instance that has already been destroyed. To fix this bug, delete or rename the two RegularExpressions.dcu files and copy RegularExpressions.pas into your source code folder. Make these changes to both the TMatch and TGroupCollection records in this unit: Declare FNotifier: IInterface; in the private section. Add the parameter ANotifier: IInterface; to the Create constructor. Assign FNotifier := ANotifier; in the constructor’s implementation. You also need to add the ANotifier: IInterface; parameter to the TMatchCollection.Create constructor. Now try to compile some code that uses the RegularExpressions unit. The compiler will flag all calls to TMatch.Create, TGroupCollection.Create and TMatchCollection.Create. Fix them by adding the ANotifier or FNotifier parameter, depending on whether ARegEx or FRegEx is being passed. With these fixes, the TPerlRegEx instance won’t be destroyed until the last TRegEx, TMatch, or TGroupCollection that uses it goes out of scope or is used with a different regular expression.

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  • Google I/O 2010 - WebM Open Video Playback in HTML5

    Google I/O 2010 - WebM Open Video Playback in HTML5 Google I/O 2010 - WebM Open Video Playback in HTML5 Chrome 101 Kevin Carle, Jim Bankoski, David Mendels (Brightcove), Bob Mason (Brightcove) The new open VP8 codec and WebM file format present exciting opportunities for innovation in HTML5 video. In this session, you'll see WebM playback in action while YouTube and Brightcove engineers show you how to support the format in your own HTML5 site. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 4 0 ratings Time: 40:02 More in Science & Technology

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  • Org-mode lags in highlighting source

    - by quanticle
    I'm using org-mode to maintain my programming notes. This means I have lots of source code blocks, as follows. #+begin_src <language name> <code> #+end_src One thing I've noticed is that when I write the #+end_src, emacs doesn't color the source code as such. Yet, if I quit emacs and reopen the notes file (or force a refresh with the Org-Refresh/Reload-Refresh setup current buffer menu entry) the source is colored grey if I'm using the GUI or green if I'm using emacs in the terminal. Is this an inherent limitation of emacs, or am I doing something wrong in setting up my code blocks that's preventing emacs from going back and recoloring the source code that I've entered?

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  • Why don't we just fix Javascript?

    - by Jan Meyer
    Javascript sucks because of a few fatalities well pointed out by Douglas Crockford. We talk a lot about it. But the point here is, why we don't fix it? Coffeescript of course does that and a lot more. But the question here is another: if we provide a webservice that can convert one version of Javascript to the next, and so on, we can keep the language up to date. Such a conversion allows old code to run, albeit with an ever-increasing startup delay, as newer browsers convert old code to the new syntax. To avoid that delay, the site only needs to take the output of the code-transform and paste it in! The effort has immediate benefits for those businesses interested in the results. The rest can sleep tight: their code will continue to run. If we provide backward code-transformation also, then elder browsers can also run ANY new code! Migration scripts should be created by those that make changes to a language. Today they don't, which is in itself a fundamental omission! It should be am obvious part of their job to provide them, as their job isn't really done without them. The onus of making it work should be on them. With this system Any site will be able to run in Any browser, but new code will run best on the newest browsers. This way we reap the benefit of an up-to-date and productive development environment, where today we suffer, supposedly because of yesterday. This is a misconception. We are all trapped in committee-thinking, and we drag along things that only worsen our performance over time! We cause an ever increasing complexity that is hard to underestimate. Javascript is easily fixed. The fact is we don't. As an example, I have seen Patrick Michaud tackle the migration problem in PmWiki. It included forward migration scripts. Whenever syntax changes were made, a migration script was added to transform pages to the new syntax. As far as I know, ALL migrations have worked flawlessly. In other words, we don't tackle the migration problem, we just drag it along. We are incompetent! And why is that? Because technically incompetent people feel they must decide for us. Because they are incompetent, fear rules them. They are obnoxiously conservative, and we suffer the consequence of bad leadership. But the competent don't need to play by the same rules. They can (and must) change them. They are the path forward. It is about time to leave the past behind, and pursue the leanest meanest, no, eternal functionality. That would in and of itself revolutionize programming. So, why don't we stop whining and fix programming? Begin with Javascript and change the world. Even if the browser doesn't hook into this system, coders could. So language updaters should take it upon them to provide migration scripts. Once they exist, browsers may take advantage of them.

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  • Exception Handling And Other Contentious Political Topics

    - by Justin Jones
    So about three years ago, around the time of my last blog post, I promised a friend I would write this post. Keeping promises is a good thing, and this is my first step towards easing back into regular blogging. I fully expect him to return from Pennsylvania to buy me a beer over this. However, it’s been an… ahem… eventful three years or so, and blogging, unfortunately, got pushed to the back burner on my priority list, along with a few other career minded activities. Now that the personal drama of the past three years is more or less resolved, it’s time to put a few things back on the front burner. What I consider to be proper exception handling practices is relatively well known these days. There are plenty of blog posts out there already on this topic which more or less echo my opinions on this topic. I’ll try to include a few links at the bottom of the post. Several years ago I had an argument with a co-worker who posited that exceptions should be caught at every level and logged. This might seem like sanity on the surface, but the resulting error log looked something like this: Error: System.SomeException Followed by small stack trace. Error: System.SomeException Followed by slightly bigger stack trace. Error: System.SomeException Followed by slightly bigger stack trace. Error: System.SomeException Followed by slightly bigger stack trace. Error: System.SomeException Followed by slightly bigger stack trace. Error: System.SomeException Followed by slightly bigger stack trace. Error: System.SomeException Followed by slightly bigger stack trace. Error: System.SomeException Followed by slightly bigger stack trace.   These were all the same exception. The problem with this approach is that the error log, if you run any kind of analytics on in, becomes skewed depending on how far up the stack trace your exception was thrown. To mitigate this problem, we came up with the concept of the “PreLoggedException”. Basically, we would log the exception at the very top level and subsequently throw the exception back up the stack encapsulated in this pre-logged type, which our logging system knew to ignore. Now the error log looked like this: Error: System.SomeException Followed by small stack trace. Much cleaner, right? Well, there’s still a problem. When your exception happens in production and you go about trying to figure out what happened, you’ve lost more or less all context for where and how this exception was thrown, because all you really know is what method it was thrown in, but really nothing about who was calling the method or why. What gives you this clue is the entire stack trace, which we’re losing here. I believe that was further mitigated by having the logging system pull a system stack trace and add it to the log entry, but what you’re actually getting is the stack for how you got to the logging code. You’re still losing context about the actual error. Not to mention you’re executing a whole slew of catch blocks which are sloooooooowwwww……… In other words, we started with a bad idea and kept band-aiding it until it didn’t suck quite so bad. When I argued for not catching exceptions at every level but rather catching them following a certain set of rules, my co-worker warned me “do yourself a favor, never express that view in any future interviews.” I suppose this is my ultimate dismissal of that advice, but I’m not too worried. My approach for exception handling follows three basic rules: Only catch an exception if 1. You can do something about it. 2. You can add useful information to it. 3. You’re at an application boundary. Here’s what that means: 1. Only catch an exception if you can do something about it. We’ll start with a trivial example of a login system that uses a file. Please, never actually do this in production code, it’s just concocted example. So if our code goes to open a file and the file isn’t there, we get a FileNotFound exception. If the calling code doesn’t know what to do with this, it should bubble up. However, if we know how to create the file from scratch we can create the file and continue on our merry way. When you run into situations like this though, What should really run through your head is “How can I avoid handling an exception at all?” In this case, it’s a trivial matter to simply check for the existence of the file before trying to open it. If we detect that the file isn’t there, we can accomplish the same thing without having to handle in in a catch block. 2. Only catch an exception if you can do something about it. Continuing with the poorly thought out file based login system we contrived in part 1, if the code calls a Login(…) method and the FileNotFound exception is thrown higher up the stack, the code that calls Login must account for a FileNotFound exception. This is kind of counterintuitive because the calling code should not need to know the internals of the Login method, and the data file is an implementation detail. What makes more sense, assuming that we didn’t implement any of the good advice from step 1, is for Login to catch the FileNotFound exception and wrap it in a new exception. For argument’s sake we’ll say LoginSystemFailureException. (Sorry, couldn’t think of anything better at the moment.) This gives us two stack traces, preserving the original stack trace in the inner exception, and also is much more informative to the calling code. 3. Only catch an exception if you’re at an application boundary. At some point we have to catch all the exceptions, even the ones we don’t know what to do with. WinForms, ASP.Net, and most other UI technologies have some kind of built in mechanism for catching unhandled exceptions without fatally terminating the application. It’s still a good idea to somehow gracefully exit the application in this case if possible though, because you can no longer be sure what state your application is in, but nothing annoys a user more than an application just exploding. These unhandled exceptions need to be logged, and this is a good place to catch them. Ideally you never want this option to be exercised, but code as though it will be. When you log these exceptions, give them a “Fatal” status (e.g. Log4Net) and make sure these bugs get handled in your next release. That’s it in a nutshell. If you do it right each exception will only get logged once and with the largest stack trace possible which will make those 2am emergency severity 1 debugging sessions much shorter and less frustrating. Here’s a few people who also have interesting things to say on this topic:  http://blogs.msdn.com/b/ericlippert/archive/2008/09/10/vexing-exceptions.aspx http://www.codeproject.com/Articles/9538/Exception-Handling-Best-Practices-in-NET I know there’s more but I can’t find them at the moment.

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  • Understanding the SQL Server 2012 BI Semantic Model (BISM)

    SQL Server 2012 introduced an unified BI Semantic Model (BISM) which is based on some of the existing as well as some new technologies. This model is intended to serve as one model for all end user experiences for reporting, analytics, scorecards, dashboards, etc. In this tip, I will talk in detail about the new BISM, how it differs from earlier the earlier Unified Dimensional Model (UDM) and how BISM lays down a foundation for future.

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  • What is Phone Call Tracking?

    Phone call tracking supplies real-time and detailed phone-call analytics reports. Reporting includes routing of incoming and outgoing calls, duration and tracking data on call volume.

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  • How to create an auto-grader in and for Python

    - by recluze
    I'm trying to create an auto-grader for one of my beginning programming courses for python. From my online search, I've come to know that it is effectively a unit test framework that tests the student's code rather than production code but I'm not really sure how to structure the flow of the program. Can anyone please provide a strategy for submission of code by students and automating the whole process of marking? For instance, how would the student code be submitted and then stored/structured on disk, how would the grades be stored/reported? I'm only looking for a broad strategy and will try on my own to fill in the blanks. (I asked this on stockoverflow.com initially but it's considered as off-topic and I was suggested to ask here.)

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  • Google I/O 2010 - Advanced Android audio techniques

    Google I/O 2010 - Advanced Android audio techniques Google I/O 2010 - Advanced Android audio techniques Android 301 Dave Sparks In this session, we will explore advanced techniques that you can employ in your apps when working with media. This includes using Android's low-level audio APIs, selecting the appropriate format for your media files, and what's now possible using new media framework APIs introduced in Android 2.2. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 3 0 ratings Time: 57:16 More in Science & Technology

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  • Google I/O Sandbox Case Study: Angry Birds

    Google I/O Sandbox Case Study: Angry Birds We interviewed Rovio, the makers of Angry Birds, at the Google I/O Sandbox on May 11, 2011 and they explained to us the benefits of building on Chrome. Angry Birds, one of the most popular games for mobile devices, is now available on Chrome! For more information about developing on Chrome, visit: code.google.com For more information on Rovio, visit: www.rovio.com From: GoogleDevelopers Views: 19 0 ratings Time: 01:14 More in Science & Technology

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  • Google Drive SDK: Downloading FIles

    Google Drive SDK: Downloading FIles In this session, we'll dive into the details of downloading files from Google Drive using the Drive API. We'll look at some code samples and discuss the various options for downloads, including downloading Google documents to various conversion formats. Post-Script: Here's a link to the complete output from our command-line demo: bpaste.net From: GoogleDevelopers Views: 99 5 ratings Time: 20:53 More in Science & Technology

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  • Webcast Replay : SANS Institute Product Review of Oracle Identity Manager

    - by B Shashikumar
    Thanks to everyone who attended the SANS Institute webinar covering the product review of Oracle Identity Manager. And a special thanks to our guest speakers from SuperValu - Phillip Black and Patrick Abreo. If you missed the webcast, you can catch a replay here  And here are the slides that were used in the webcast.  There were many questions that we could not answer as we ran out of time. We have captured some of the questions with responses below. Is Oracle Identity Analytics still offered as a separate product or is it part of Oracle Identity Manager? Oracle Identity Manager and Oracle Identity Analytics are now offered as part of Oracle Identity Governance Suite. OIA and OIM share a common UI architecture, common data model and common support for connected and disconnected resources.  When requesting new access/entitlements is there an approval process? Yes. We leverage SOA BPEL-based workflows for approvals  Are the identity self service capabilities based on Oracle ADF? Yes they are completely based on Oracle ADF  Can you give some examples of personalization and customization with Oracle Identity Manager 11gR2? With the new UI config framework we can enable different levels of UI customization. Customers now have the ability to Point & click to customize; or drag and drop customization without any need for coding. So users can easily personalize the interface of their application within the browser. For example, they can change the logo, Rearrange, hide Home Page regions; regularly searched items can be saved and re-used; Searchable & search results columns can be configured; Sorting preferences are remembered and so on. For more sophisticated customization, Customers can also edit the standard JSF within the page to alter business rules, modify page flows, page layouts and other items. Can you explain the role of sandboxes in customization? Customers can make their custom changes within a sandbox so that it doesn’t impact their production environment. They can make their changes, validate those changes, stage and then commit those changes without affecting production users. This is similar to how source code control systems like perforce work To watch a replay of the webcast, click here

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  • Google I/O 2012 - Advancing Accessibility for the Web

    Google I/O 2012 - Advancing Accessibility for the Web Rachel Shearer, Dominic Mazzoni, Charles Chen This session will help you learn through code samples and real world examples how to design and test your web apps for complete accessibility coverage. We will review APIs such as the Text-to-speech (TTS) API, tools like ChromeVox and ChromeShades and how Google products implement solutions today for users with disabilities. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 61 3 ratings Time: 55:25 More in Science & Technology

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