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• ASP.NET MVC 2 Released!

  - by kaleidoscope

  ASP.NET MVC 2 Released! ASP.NET MVC 2 Features ASP.NET MVC 2 adds a bunch of new capabilities and features. Some of the new features and capabilities include: § New Strongly Typed HTML Helpers § Enhanced Model Validation support across both server and client § Auto-Scaffold UI Helpers with Template Customization § Support for splitting up large applications into ‘Areas’ § Asynchronous Controllers support that enables long running tasks in parallel § Support for rendering sub-sections of a page/site using Html.RenderAction § Lots of new helper functions, utilities, and API enhancements § Improved Visual Studio tooling support More details can be found at http://www.azurejournal.com/2010/03/aspnet-MVC-2-released/ http://www.asp.net/mvc/   Anish, S

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• Visual Studio 2013 Preview now available as free download

  - by TATWORTH

  Originally posted on: http://geekswithblogs.net/TATWORTH/archive/2013/06/27/visual-studio-2013-preview-now-available-as-free-download.aspxAt http://www.microsoft.com/visualstudio/eng/2013-downloads, Microsoft have made available Visual Studio 2013 Preview available as a free download.  Four versions plus TFS server are available. The versions are:Ultimate PremiumProfessionalTest ProfessionalInstalling them will install the Dot Net Framework 4.5.1. Somesgar blogged about this at http://blogs.msdn.com/b/somasegar/archive/2013/06/26/visual-studio-2013-preview.aspxThe new features that VS2013 brings in are:Round-tipping projects with VS2012 (requires VS2012 Update 3)Git supportSupport for Windows 8.1Improved asynchronous supportImproved debugging64-bit edit and continue

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• In-depth Coverage for Oracle Workflow

  - by Steven Chan (Oracle Development)

  I'm lucky to work with many talented people in the Applications Technology Group, and many of them contribute articles to this blog.  Some team members have their own blogs.  If you work with Oracle Workflow, here's one that you should be following: Oracle E-Business Suite - Workflow This blog is updated every few months by our development team with in-depth technical articles about Oracle Workflow-related topics.  For example, articles posted there include: Implementing a post-notification function to perform custom validation E-Business Suite Proactive Support - Workflow Analyzer Asynchronous Business Event Subscriptions - Troubleshooting Tips Oracle E-Busienss Suite RCD - Applications Technology Releases 12.1 and 12.2 SMTP Authentication Feature in R12.1.3 Configurable User LOV in Worklist UI Oracle Business Event and Subsciptions Execution Flow Understanding AQs in Workflow SSL in Oracle Workflow Leveraging Oracle Workflow for Declarative PageFlow If you have suggestions about Workflow topics that you'd like to see covered there, drop them a line.

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• Are there non-programming related activities akin to solving programming problems ?

  - by julien

  I'm talking about particular activities, for which you can draw parallels with the specific kind of reasonning needed when solving programming problems. Counter examples are activities that would help in almost any situation, like : take a shower or any other, somewhat passive activities, which are only helpful in triggering this sort of asynchronous problem solving our brain does exercise, because you brain simply works better when you're fit EDIT : It seems this question was quite misunderstood. I wasn't asking about what you can do when stuck on a problem but rather, what kind of activities you have in you spare time that you think help you, more or less directly, solving programing problems.

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• Async CTP Refresh for Visual Studio 2010 SP1 Released

  - by Reed

  The Visual Studio team today released an update to the Visual Studio Async CTP which allows it to be used with Visual Studio SP1.  This new CTP includes some very nice new additions over the previous CTP.  The main highlights of this release include: Compatibility with Visual Studio SP1 APIs for Windows Phone 7 Compatibility with non-English installations Compatibility with Visual Studio Express Edition More efficient Async methods due to a change in the API Numerous bug fixes New EULA which allows distribution in production environments Anybody using the Async CTP should consider upgrading to the new version immediately.  For details, visit the Visual Studio Asynchronous Programming page on MSDN.

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• Tuesday at Oracle OpenWorld 2012 - Must See Session: “Oracle Fusion Applications: Best Practices in Integration Design Patterns”

  - by Lionel Dubreuil

  Don’t miss this “CON8685 - Oracle Fusion Applications: Best Practices in Integration Design Patterns “ session: Speakers: Rajesh Raheja - Senior Director, Development, Oracle Ravi Sankaran - Director, Applications Development, Oracle Date: Tuesday, Oct 2 Time: 1:15 PM - 2:15 PM Location: Palace Hotel - Telegraph Oracle Fusion Applications provide various ways to integrate their functional capabilities with other Oracle applications as well as third-party and legacy applications. In this session, you will learn the patterns used when communicating with Oracle Fusion Applications with a SOA approach. It addresses items related to identifying the integration artifacts available, also known as assets, in Oracle Enterprise Repository; how to invoke synchronous and asynchronous Web services; importing and exporting bulk data; and any integration issues to look out for. The patterns will be applicable to on-premises and SaaS/cloud deployment modes and are indicated as such. Objectives for this session are to: Highlight the various ways to integrate with Oracle Fusion Applications Showcase use of Oracle Fusion Middleware technologies for integration Describe best practices and design patterns for integration

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• Tuesday at Oracle OpenWorld 2012 - Must See Session: “Oracle Fusion Applications: Best Practices in Integration Design Patterns”

  - by Lionel Dubreuil

  Don’t miss this “CON8685 - Oracle Fusion Applications: Best Practices in Integration Design Patterns “ session: Speakers: Rajesh Raheja - Senior Director, Development, Oracle Ravi Sankaran - Director, Applications Development, Oracle Date: Tuesday, Oct 2 Time: 1:15 PM - 2:15 PM Location: Palace Hotel - Telegraph Oracle Fusion Applications provide various ways to integrate their functional capabilities with other Oracle applications as well as third-party and legacy applications. In this session, you will learn the patterns used when communicating with Oracle Fusion Applications with a SOA approach. It addresses items related to identifying the integration artifacts available, also known as assets, in Oracle Enterprise Repository; how to invoke synchronous and asynchronous Web services; importing and exporting bulk data; and any integration issues to look out for. The patterns will be applicable to on-premises and SaaS/cloud deployment modes and are indicated as such. Objectives for this session are to: Highlight the various ways to integrate with Oracle Fusion Applications Showcase use of Oracle Fusion Middleware technologies for integration Describe best practices and design patterns for integration

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• Great Java EE Concurrency Write-up!

  - by reza_rahman

  As you are aware JSR-236, Concurrency Utilities for the Java EE platform, is now a candidate for addition into Java EE 7. While it is a critical enabling API it is not necessarily obvious why it is so important. This is especially true with existing features like EJB 3 @Asynchronous, Servlet 3 async and JAX-RS 2 async. On his blog DZone MVB Sander Mak does an excellent job of explaining the motivation and importance of JSR-236. Perhaps even more importantly, he discusses potential issues with the API such alignment with CDI and Java SE Fork/Join. Read the excellent write-up here!

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• Concurrency Utilities for Java EE 6: JSR 236 Rebooting

  - by arungupta

  JSR 166 added support for concurrency utilities in the Java platform. The JSR 236's, a.k.a Concurrency Utilities for Java EE, goal was to extend that support to the Java EE platform by adding asynchronous abilities to different application components. The EG was however stagnant since Dec 2003. Its coming back to life with the co-spec lead Anthony Lai's message to the JSR 236 EG (archived here). The JSR will be operating under JCP 2.8's transparency rules and can be tracked at concurrency-spec.java.net. All the mailing lists are archived here. The final release is expected in Q1 2013 and the APIs will live in the javax.enterprise.concurrent package. Please submit your nomination if you would like to join this EG.

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• DDD / Layers and legacy systems

  - by CSM

  I have to refactor a complex C# app (many dialogs, mixed logic and so on). There is a part managing the communication with special hardware equipments (sending commands and receive data via asynchronous c# callbacks). The code is "spaghetti" with mixed UI/Logic/Communication/etc and my task is to split the layers in a DDD sense. So, to which layer belongs a callback driver routine? The callbacks are creating "bubbles" in the system, up to the UI layer and because of this I cannot enforce the essential principle that any element of a layer depends only on other elements in the same layer or on elements of the layers "beneath" it. Thank you in advance.

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• HTTP events? Is there a standard / precedent for this?

  - by user619818

  Our architecture is HTTP servers (custom written) which whereby custom clients send a HTTP request for some information and information is returned just as HTTP works. But we need a special custom 'extension' which is a request which is a subscription for receiving asynchronous 'events' on a resource. For example the client sends an http request subscribing for events on some entity. As the 'entity' generates events they are passed to the http server and the http server must then lookup subscriptions for that entity and send the event message to all subscribed clients. Hope that makes sense. So my questions are: Has this been done before / or is there a standard I should be looking at? If no standard, any suggestions on how to implement? How does a http server send an unsolicited 'message' to a client?

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• Tasks, jobs, activities, operations... which term to use when?

  - by Paul Stovell

  My application has a number of different asynchronous 'things' that it performs: There are things that fire off a schedule (every 5 minutes) There are things that are fired when a user clicks a button There are things that are triggered by an incoming web service call I use the terms like this: Scheduled things = Jobs User-triggered things = Tasks Web service-triggered things = Operations Tasks are quite complicated, so they're implemented using a hierarchy of different objects which I call Activities (operations and jobs may also begin to use these Activities as their building blocks). I feel like I might be using the wrong terms - for example, would you expect something that happens every 5 minutes automatically to be a Job or a Task? Is there an industry standard for this? All of the words seem to mean the same thing.

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• Speaking in Omaha: December 7, 2011

  - by Bill Graziano

  I’m presenting in Omaha on Writing Faster SQL at 6PM on December 7th.  You can find meeting details on the Omaha SQL Server User Group page. The meeting location requires an RSVP so building security has a list of attendees. The presentation is a series of suggestions on improving performance.  It ranges from simple things like comparing indexed columns to scalar values up to tips for reducing query compiles and asynchronous processing patterns.  Nearly all of these come from specific issues I’ve encountered working on poorly performing SQL Servers.

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• Android loading screens blocking, good practice?

  - by Oren

  I've noticed many (if not all) android games don't support the "back" button functionality during their loading screens. Which leads to some frustrating moments when a user accidentally starts up the game and has to wait for the long loading stage to end in order to close it. So my questions are: 1) Why is that ? Is there a good reason to avoid something like asynchronous loading (or some other solution to this problem) in android games ? 2) If there is no good reason not to support this functionality, what would be the best way to accomplish it ?

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• Jersey 2.0 Milestone 2 Now Available

  - by arungupta

  Jersey 2.0 milestone 2 is now available. It builds upon the first milestone and adds several new features such as server-side asynchronous processing, server-side content negotiation, improved JAX-RS parameter injection, and several others. The REST endpoints can be published on Java SE HTTP Server, Grizzly 2 HTTP container, and some basic Servlet-based deployments. It also provides HTTPURLConnection-based client API implementation. Read about these and more about what's new in Marek's detailed post. Of course this is also the future reference implementation for JAX-RS 2.0. Feel like trying it out? Simply go to Maven Central (of course none of this is production quality at this point). The latest JAX-RS Javadocs and Jersey 2.0 API docs are good starting points to explore. And provide them feedback at [email protected].

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• Are Promises/A a good event design pattern to implement even in synchronous languages like PHP?

  - by Xeoncross

  I have always kept an eye out for event systems when writing code in scripting languages. Web applications have a history of allowing the user to add plugins and modules whenever needed. In most PHP systems you have a global/singleton event object which all interested parties tie into and wait to be alerted to changes. Event::on('event_name', $callback); Recently more patterns like the observer have been used for things like jQuery. $(el).on('event', callback); Even PHP now has built in classes for it. class Blog extends SplSubject { public function save() { $this->notify(); } } Anyway, the Promises/A proposal has caught my eye. It is designed for asynchronous systems, but I'm wondering if it is also a good design to implement now that even synchronous languages like PHP are changing. Combining Dependency Injection with Promises/A seems it might be the best combination for handling events currently.

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• How to write loosely coupled classes in node.js

  - by lortabac

  I am trying to understand how to design node.js applications, but it seems there is something I can't grasp about asynchronous programming. Let's say my application needs to access a database. In a synchronous environment I would implement a data access class with a read() method, returning an associative array. In node.js, because code is executed asynchronously, this method can't return a value, so, after execution, it will have to "do" something as a side effect. It will then contain at least 1 line of extraneous code which has nothing to do with data access. Multiply this for all methods and all classes and you will very soon have an unmanageable "code soup". What is the proper way to handle this problem? Am I approaching it the wrong way?

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• How to implement proper identification and session managent on json post requests?

  - by IBr

  I have some minor messaging connection to server from website via json requests. I have single endpoint which distributes requests according to identification data. I am using asynchronous server and handle data when it comes. Now I am thinking about extending requests with some kind of session. What is the best way to define session? Get cookie when registered and use token as long as session runs with each request? Should I implement timeout for token? Is there alternative methods? Can I cache tokens to same origin requests? What could I use on client side (Web browser)? How about safety? What techniques I should use to throw away requests with malformed data, to big data, without choking server down? Should I worry?

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• What programming language matches this description? [on hold]

  - by Benubird

  I am looking for a functional language that is basically dynamic programming - i.e. one where functions are first-class objects - but where all function calls are asynchronous by default; i.e. you define function X(a,b) = (Y(a)+Z(b)), and when X() is called, it sees it is waiting for the return from two functions, runs one in the current thread, and spawns a new thread to run the other. The future is very much parallel processing; multiple cores, multiple machines, the internet of things, etc. and I was wondering if there was a language specifically designed to make this kind of parallelization easy. I currently have only used imperative languages (c, php, java, ruby, etc), so I don't know anything about what kind of functional languages are available.

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• Plagued by multithreaded bugs

  - by koncurrency

  On my new team that I manage, the majority of our code is platform, TCP socket, and http networking code. All C++. Most of it originated from other developers that have left the team. The current developers on the team are very smart, but mostly junior in terms of experience. Our biggest problem: multi-threaded concurrency bugs. Most of our class libraries are written to be asynchronous by use of some thread pool classes. Methods on the class libraries often enqueue long running taks onto the thread pool from one thread and then the callback methods of that class get invoked on a different thread. As a result, we have a lot of edge case bugs involving incorrect threading assumptions. This results in subtle bugs that go beyond just having critical sections and locks to guard against concurrency issues. What makes these problems even harder is that the attempts to fix are often incorrect. Some mistakes I've observed the team attempting (or within the legacy code itself) includes something like the following: Common mistake #1 - Fixing concurrency issue by just put a lock around the shared data, but forgetting about what happens when methods don't get called in an expected order. Here's a very simple example: void Foo::OnHttpRequestComplete(statuscode status) { m_pBar->DoSomethingImportant(status); } void Foo::Shutdown() { m_pBar->Cleanup(); delete m_pBar; m_pBar=nullptr; } So now we have a bug in which Shutdown could get called while OnHttpNetworkRequestComplete is occuring on. A tester finds the bug, captures the crash dump, and assigns the bug to a developer. He in turn fixes the bug like this. void Foo::OnHttpRequestComplete(statuscode status) { AutoLock lock(m_cs); m_pBar->DoSomethingImportant(status); } void Foo::Shutdown() { AutoLock lock(m_cs); m_pBar->Cleanup(); delete m_pBar; m_pBar=nullptr; } The above fix looks good until you realize there's an even more subtle edge case. What happens if Shutdown gets called before OnHttpRequestComplete gets called back? The real world examples my team has are even more complex, and the edge cases are even harder to spot during the code review process. Common Mistake #2 - fixing deadlock issues by blindly exiting the lock, wait for the other thread to finish, then re-enter the lock - but without handling the case that the object just got updated by the other thread! Common Mistake #3 - Even though the objects are reference counted, the shutdown sequence "releases" it's pointer. But forgets to wait for the thread that is still running to release it's instance. As such, components are shutdown cleanly, then spurious or late callbacks are invoked on an object in an state not expecting any more calls. There are other edge cases, but the bottom line is this: Multithreaded programming is just plain hard, even for smart people. As I catch these mistakes, I spend time discussing the errors with each developer on developing a more appropriate fix. But I suspect they are often confused on how to solve each issue because of the enormous amount of legacy code that the "right" fix will involve touching. We're going to be shipping soon, and I'm sure the patches we're applying will hold for the upcoming release. Afterwards, we're going to have some time to improve the code base and refactor where needed. We won't have time to just re-write everything. And the majority of the code isn't all that bad. But I'm looking to refactor code such that threading issues can be avoided altogether. One approach I am considering is this. For each significant platform feature, have a dedicated single thread where all events and network callbacks get marshalled onto. Similar to COM apartment threading in Windows with use of a message loop. Long blocking operations could still get dispatched to a work pool thread, but the completion callback is invoked on on the component's thread. Components could possibly even share the same thread. Then all the class libraries running inside the thread can be written under the assumption of a single threaded world. Before I go down that path, I am also very interested if there are other standard techniques or design patterns for dealing with multithreaded issues. And I have to emphasize - something beyond a book that describes the basics of mutexes and semaphores. What do you think? I am also interested in any other approaches to take towards a refactoring process. Including any of the following: Literature or papers on design patterns around threads. Something beyond an introduction to mutexes and semaphores. We don't need massive parallelism either, just ways to design an object model so as to handle asynchronous events from other threads correctly. Ways to diagram the threading of various components, so that it will be easy to study and evolve solutions for. (That is, a UML equivalent for discussing threads across objects and classes) Educating your development team on the issues with multithreaded code. What would you do?

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• Accessing Server-Side Data from Client Script: Using Ajax Web Services, Script References, and ...

  Today's websites commonly exchange information between the browser and the web server using Ajax techniques. In a nutshell, the browser executes JavaScript code typically in response to the page loading or some user action. This JavaScript makes an asynchronous HTTP request to the server. The server processes this request and, perhaps, returns data that the browser can then seamlessly integrate into the web page. Typically, the information exchanged between the browser and server is serialized into JSON, an open, text-based serialization format that is both human-readable and platform independent.Adding such targeted, lightweight Ajax capabilities to your ASP.NET website requires two steps: first, you must create some mechanism on

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• About best practices of JMS integration using TIBCO .Net client

  - by Waheed Sayed

  I'm working on an integration project where I'm talking to JMS framework using TIBCO .Net client. A colleague is recommdending a design decision based on a fear of receiving too many messages suddenly in a way that our application can't handle it. We are using Asynchronous mode while receiving messages. I'm new to that topic so I couldn't find quick best practices to support his clam or mine. Any suggestions? How can I test this subject?

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• Is there a C# secure socket other than SSLStream?

  - by AI0867

  .NET 2.0 provides only the System.Net.Security.SslStream class for secure sockets in .NET 2.0 and higher, but this uses the Stream interface, which provides the blocking Read/Write members and asynchronous Begin{Read,Write} members. I'm looking for a class that provides functionality similar to System.Net.Sockets.Socket. Specifically, something resembling Poll/Select, so I can handle multiple sockets in a single thread without blocking. The mentalis security library supplies a SecureSocket class, but is explicitly unsupported for versions greater than .NET 1.1.

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• Threading.Timer vs. Forms.Timer

  - by Jekke

  The short form of this question: When, if ever, is it appropriate to use the Forms.Timer in a multithreaded WinForms application? More specifically, I am architecting an application that uses multiple System.Threading.Timers to launch processes asynchronously, check queues containing the results of those asynchronous processes, and update the statistics to be shown by the application's main form. In an application like that, is it appropriate to use a Forms.Timer to actually check the application statistics and draw them to the main form or would that just throw a wrench into the application's smooth running?

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• xmlhttprequest always return with status code 0 for firefox

  - by Neo

  hi, I am trying to make asynchronous calls using xmlhttprequest object so it completely works fine in internet explorer but for firefox it wont work a small code snippet of problem if (req.readyState == 4) { if (req.status == 200) //here firefox gives status code always 0 and for IE works fine { //read response } else { alert("There was a problem with the request."); } }

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