Different ways to Implement the Singleton in .NET

Lots of blogs and sites are talking about the ways to implement the singleton in different ways; and surprisingly many of them some times miss the thread safety or the thread sync. According to the "Design Patterns: Elements of Reusable Object-Oriented Software" the implementation of Singleton should be as follow:







The above implementation may work well considering that singleton implementation can be breakable at the first call. In "GetInstance" method we are checking "instance == null" which returns true when 2 requests comes at the same time at the first call. Plus we are not taking the advantage of the .NET language features. Here is the thread safe implementation of Singleton in .NET C# language.






Here you need to watch the usage of volatile (One can consider the implementation of "volatile" exactly opposite of "ThreadStatic" keyword) and static keyword gives the grantee to be thread safe in .NET compilation. (According to Jeffrey Richter).

Microsoft Dublin & Velocity

Microsoft Windows Server AppFebric (Dublin and Velocity) is a bundle of integrated technologies which makes easier to develope, extend and manage the web and composite application that runs on IIS.

If you are searching for the Windows Azure platform AppFabric, which helps developers connect apps and services between Windows Azure and on-premises deployments, see the Windows Azure site.

What is Dublin?

Dublin enriches Windows Server to give enhanced hosting and management capabilities for WCF and WF services. Dublin also adds service management extensions to the hosting features of Internet Information Services (IIS) and Windows Activation Service (WAS), and the run-time components and services of the .NET Framework 4. Dublin addresses the challenges of hosting WCF- and WF-based applications by making it easier to deploy, configure, and manage applications.

Typically in Service Oriented Architecture people are building the service for the different operations and exposes these services to the consumer to consume. Since WCF and WF released; the deployment, monitoring and scaling these services never been an easy task. Some times to consuming these service it self a trouble making task. With the help of Dublin we can perform these tasks almost effortless. Dublin can be easily introduced through IIS management console using the Dublin module of Windows Power Shell.

What is Velocity?

Velocity is a highly scalable in-memory caching mechanism using which one can improve the performance of the application with all types of data. For any application one can leverage the Velocity rather then writing new caching schema. Velocity comes with Dublin; the same setup programme installs Velocity and Dublin.

For more details about the architecture details please Click Here!!


Keep watching this space for more technical updates.

Microsoft released Web Platform Installer 2.0

Commonly known as Web PI; a tool that makes user life easier to sync up with the latest updates for the MS products like Internet Information Services (IIS), Visual Web Developer, .NET Framework, SQL Server Express Edition etc. (List goes on and on and on......). The Web PI has Windows Web Application Gallery using which you can users can have pleasant experience whle blogging. It also provides the support for Content Management Activities.

 

 

For downloading Web PI 2.0 Click Here!!

 

For more technical updates and latest technology news keep watching this space,