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POWhy are these asynchronous RIA Service calls executed in serial on the web server?
 

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  1. POWhy are these asynchronous RIA Service calls executed in serial on the web server?
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    <p>I'm calling the RIA Service method <em>ImportSubcomponentFileSetFiles</em> (which is an Invoke, not Query) twice as follows:</p> <pre><code>foreach (var viewModel in FileSetViewModels.Where(vm =&gt; vm.IsSelectedForImport)) { DomainContext.ImportSubcomponentFileSetFiles(viewModel.SubcomponentFileSet.Id, callback =&gt; { //... DomainContext.Load(DomainContext.GetSubcomponentFileSetWithStatusQuery(subcomponentFileSetId), LoadBehavior.RefreshCurrent, callback2 =&gt; { //... }, true); }, null); } </code></pre> <p>I can see in Fiddler that two requests go out to <em>ImportSubcomponentFileSetFiles</em> straight away.</p> <p><em>ImportSubcomponentFileSetFiles</em> takes ~15 seconds to complete. The first call comes back after about 15 seconds and the second call comes back 15 seconds after that. I can see from logging that the second call to <em>ImportSubcomponentFileSetFiles</em> doesn't start until the first call has completed.</p> <p>My question is, why do these asynchronous requests get processed serially on the server and how can I process them in parallel?</p> <p><strong>ADDITIONAL INFORMATION</strong></p> <ul> <li>The WCF Ria Services are hosted in an ASP.NET web application.</li> <li>I'm not storing anything in the session.</li> <li>I'm using Entity Framework 4 in the service method.</li> <li>The Domain Services class extends LinqToEntitiesDomainService&lt;MyObjectContext&gt;</li> </ul> <p>My service method is as follows:</p> <pre><code>public void ImportSubcomponentFileSetFiles(int subcomponentId) { Debug.WriteLine("{0}: {1} - ImportSubcomponentFileSetFiles method started", subcomponentId, DateTime.Now); //...code for fetching subcomponentFileSet subcomponentFileSet.ImportFiles(ObjectContext); Debug.WriteLine("{0}: {1} - ImportSubcomponentFileSetFiles method finished", subcomponentId, DateTime.Now); } </code></pre> <p>Here are my logs detailing the second method call not starting until the first one has finished:</p> <pre><code>File Set A: 27/1/2011 11:20:06 PM 11:20:06 PM - Calling ImportSubcomponentFileSetFiles (Silverlight Client) File Set A: 27/1/2011 11:20:06 PM 11:20:06 PM - ImportSubcomponentFileSetFiles Called (Silverlight Client) File Set B: 27/1/2011 11:20:06 PM 11:20:06 PM - Calling ImportSubcomponentFileSetFiles (Silverlight Client) File Set B: 27/1/2011 11:20:06 PM 11:20:06 PM - ImportSubcomponentFileSetFiles Called (Silverlight Client) File Set A: 01/27/2011 23:20:06 - ImportSubcomponentFileSetFiles method started (Server) File Set A: 01/27/2011 23:20:06 - ImportFiles Started (Server) File Set A: 01/27/2011 23:20:23 - ImportFiles Finished (Server) File Set A: 01/27/2011 23:20:23 - ImportSubcomponentFileSetFiles method finished (Server) File Set A: 27/1/2011 11:20:23 PM - Import callback recieved (Silverlight Client) File Set A: 01/27/2011 23:20:23 - GetSubcomponentFileSetWithStatus Started (Server) File Set A: 01/27/2011 23:20:23 - GetSubcomponentFileSetWithStatus Finished (Server) File Set B: 01/27/2011 23:20:23 - ImportSubcomponentFileSetFiles method started (Server) File Set B: 01/27/2011 23:20:23 - ImportFiles Started (Server) File Set A: 27/1/2011 11:20:23 PM - Refresh callback recieved (Silverlight Client) File Set B: 01/27/2011 23:20:36 - ImportFiles Finished (Server) File Set B: 01/27/2011 23:20:36 - ImportSubcomponentFileSetFiles method finished (Server) File Set B: 27/1/2011 11:20:36 PM - Import callback recieved (Silverlight Client) File Set B: 01/27/2011 23:20:36 - GetSubcomponentFileSetWithStatus Started (Server) File Set B: 01/27/2011 23:20:36 - GetSubcomponentFileSetWithStatus Finished (Server) File Set B: 27/1/2011 11:20:36 PM - Refresh callback recieved (Silverlight Client) </code></pre> <p>Cheers,<br> Chris</p>
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