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POWindows service / WCF and threading, beginners question
 

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  1. POWindows service / WCF and threading, beginners question
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    <p>We have a web service that sends requests to a windows service which hosts a WCF service for processing.</p> <p>The interface is simple:</p> <pre><code>namespace MyApp { [ServiceContract] public interface IMyApp { [OperationContract] string DoSomething(string xml); } [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)] class MyAppWcf : IMyApp { public string DoSomething(string xml) { Customer customer = GlobalObject.GetCustomer(xml); //millisecs return customer.DoSomething(xml); //Takes 5-10 seconds } } } </code></pre> <p>GlobalObject is instantiated on the WindowsService.OnStart() and contains all the static data the customer objects need. The interface DoSomething() will be called up to ca. 30 different clients.</p> <p>Questions:<br /> 1. What is the default threading behaviour now? Will each call have to wait until the last one is finished?<br /> 2. What effect will changing InstanceContextMode?<br /></p> <p><strong>REAL</strong> question:<br /> There are up to 1000 customer objects, 2 different customer objects can be called in parallel, but the same one cannot. e.g.<br /> DoSomething("Customer 1"); => Goes ahead. Answer in 10 seconds<br /> DoSomething("Customer 2"); => Goes ahead in parallel with the above call.<br /> DoSomething("Customer 2"); => Will wait for last call of DoSomething("Customer 2") to finish<br /></p> <p>What should my service behavior settings be and do I have to implement a lock mechanism to prevent the same object being processed more than once in parallel?</p> <p>Thanks.</p> <p>Edit 2: GlobalObject.GetCustomer() just retrieves the customer mentioned in the XML from a dictionary.</p>
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