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.NET Forum / ASP.NET / Web Services / April 2006Forcing single in-line web service execution?
Noob here, I am trying to manage calls from multiple clients to my web service by only letting one execute at a time and forcing the others to wait. Code is as follows: ------------------------------ <WebMethod()> Public Function myFunction(ByVal sXMLData As String) As String Static Dim objLock As New Object SyncLock objLock (do some stuff here) Return sRtn End Synclock End Function -------------------------------- I'm sure there's something I'm missing here, as multiple clients coming in simultaneously will execute things at the same time. Am I missing the point of Synclock? Can someone point me in the right direction? TIA What you need to do is create a Singleton object and then lock that object. That way even though users's might be calling the webservice at the same time, the object would only allow itself to be called by one thread at a time. Google the "Singleton Pattern." Shaun McDonnell > Noob here, > [quoted text clipped - 24 lines] > > TIA This will only work within the same worker process .. If the webservice instances are all runnig in the same process you could even just lock on the type to have synchronized behavior between multiple instances. Generally though webservices are run in a multiple process configuration (i.e. multiple worker processes). In this case neither of the above solutions will work as both are scoped to the process level. If you are running multiple worker processes on the same machine you can use a mutex http://msdn2.microsoft.com/en-us/library/system.threading.mutex(VS.80).aspx to synchronize all (including between processes) If you are running multiple processes on multiple machines, you would need to put up a manager process to manage the synchronization between them. Cheers, Greg > What you need to do is create a Singleton object and then lock that > object. That way even though users's might be calling the webservice at [quoted text clipped - 33 lines] >> >> TIA You are correct. A mutex would be the answer if you're web service spans multiple w3wp.exe's. Shaun McDonnell > This will only work within the same worker process .. > [quoted text clipped - 56 lines] >>> >>> TIA
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