Friday, September 7, 2012

async web service - windows app ^ browser app

http://ondotnet.com/pub/a/dotnet/2005/08/01/async_webservices.html?page=3 mentioned that ...

If the application needs the web service output in the later stages of the thread, then the WaitHandle is the best approach. For example, if the web service queries a database and retrieves a value needed in the parent process and then displays the final result on GUI, then WaitHandle should be used. We need the parent thread to block at a certain stage.

Most web apps come under this scenario. In all other scenarios, we can use callback. Mostly Windows apps use this approach.

In my mind this is the inherent difference between windows and web apps -- web app has a dominant thread returning data to the browser while other threads are Unwanted or optional.

Windows apps (swing, winform, wpf etc) typically use a lot of threads beside the UI thread. Most tasks should avoid the UI thread, and keep the UI snappy.

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