Asynchronous HTTP Modules and HTTP Handlers in Asp.Net 4.5

[Carlos Admirador]

Buenas al grupo.

Algún ejemplo "real-world" de "Asynchronous HTTP Modules and HTTP Handlers" ?

Entiendo que no afecta al performance per se, sino afecta a la escalabilidad.

http://www.endurasoft.com/blog/post/implementing-an-asynchronous-httpmodule.aspx

http://mvolo.com/things-you-still-cant-do-with-asp-net-modules-on-iis/#comment-4430

Hay HttpHandlers interesantes como de Orellabac, para ver las sesiones de los  usuarios conectados. Lo que no sé el rendimiento que tendría para 4000 usuarios potenciales, quizá concurrentes 500-600.

http://mrojas.ghost.io/tracking-session-size-in-asp-net-applications/
https://github.com/orellabac/OnlineSessionModule

Otro ejemplo de HttpHandler sin asincronismo.

https://chadcarter30101.blogspot.com.es/2013/07/aspnet-httphandler-by-example.html

Un ejemplo de Real world async httpHandler podría ser ELMAH:

 ErrorLogDownloadModule  is frankly the module that would benefit the most from being asynchronous as it can take a while to run as it serves to download. To that extent, it is already implemented in an asynchronous manner by virtue of implementing  IHttpAsyncHandler . It doesn't used tasks/TPL but it's asynchronous alright.
https://github.com/elmah/Elmah/blob/1x/src/ErrorLogDownloadHandler.cs#L39

Ahora veo, que existe un  ASP.NET Async SessionState module

https://www.nuget.org/packages/Microsoft.AspNet.SessionState.SessionStateModule/

https://www.nuget.org/packages/Microsoft.AspNet.SessionState.SqlSessionStateProviderAsync/

The default ASP.NET SessionStateModule is already partly asynchronous; it reads the request state asynchronous, but it doesn’t support async when reading/writing to the session store.  In the .NET Framework 4.6.2 release, Microsoft changed this by introducting a new interface named ISessionStateModule.

Thanks to the async SessionState module it becomes possible to access the session storage providers(SQL Server, Redis,…) asynchronously. Async I/O operation helps release the thread more quickly than synchronous I/O operation, and ASP.NET can handle other requests.

Here are the required steps to start using this module:

• Change your application to target .NET Framework 4.6.2
• Download and install the Microsoft.AspNet.SessionState.SessionStateModule NuGet package. This will replace the default session state provider by the new async one.
• Download an async session state provider from NuGet. At the moment of writing I only could find an implementation for SQL Server, but the hope is that other will follow son.

Por favor, pueden comentar sus experiencias respecto Asynchronous HTTP Modules and HTTP Handlers,   ASP.NET Async SessionState module, ?

Muchas gracias por su tiempo.

Saludos.

Carlos.

[Juan Nallar]

Yo usé en un proyecto reciente async wep apis... no sé si te sirve.

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