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  • WCF InstanceContextMode and ConcurrencyMode

    I recently ran into a concurrency issue with WCF on a customer's system. I'll get into the details later (though not too much detail... NDA ;) ), but it involved some testing of the various combinations of InstanceContextMode and ConcurrencyMode settings for a WCF service. The table below is an attempt to clarify the results...


    InstanceContextMode
    ConcurrencyMode
    Resulting Behaviour
    PerCall
    Single
    • New InstanceContext created per call
    • Calls processed concurrently, because each call gets it's own instance

    Multiple
    Same as with ConcurrencyMode.Single
    PerSession
    Single
    • New InstanceContext is created for each client proxy connection
    • Each call is pooled and processed serially in a FIFO manner

    Multiple
    • New InstanceContext is created for each client proxy connection
    • Each call is processed as soon as it arrives
    • A single instance of the proxy is required for concurrent processing from a single client
    Singlton
    Single
    • Single instance of an InstanceContext
    • Each call is pooled and processed serially in a FIFO manner

    Multiple
    • Single instance of an InstanceContext
    • Each call is processed as soon as it arrives
    • The developer must manage thread-safety


    It's also worth noting that if you are using ServiceHost in an executable assembly, that the Main() method not be marked with the single threaded appartment attribute [System.STAThreadAttribute()]. This causes the application to be single threaded, and the additional threads will not be created regardless of the ConcurrencyMode.Multiple setting. Rather, it should be decorated with the multi-threaded appartment attribute [System.MTAThreadAttribute()].

    作者:Angelo Lee
    本文版权归作者和博客园共有,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文连接,否则保留追究法律责任的权利.
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  • 原文地址:https://www.cnblogs.com/yefengmeander/p/2887740.html
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