c# - 自托管WCF服务: ConcurrencyMode.多个但仅使用一个线程？

Question

我已开始使用WCF来开发WINDOWS服务托管的calc引擎的第一步。该服务运行良好，但似乎所有调用都只使用一个线程，但我需要它具有可伸缩性并使用多线程。

忽略代码等中的所有跟踪信息，因为这是该应用程序人员的早期。

它调用一些第三方软件(COM)，该软件在服务启动时将信息读入内存(ThirdParty.Initialise(strInit))，然后每次调用ProcessInformation都会从给定的XML字符串中返回计算出的结果。

到目前为止，无论我将ServiceBehavior属性设置为什么，而且无论我使用多少个单独的使用者，所有调用似乎都只使用一个线程-有人可以帮忙吗？

代码概述:

[ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple, InstanceContextMode = InstanceContextMode.PerCall, UseSynchronizationContext = false)]
public class TestWCFService : ITestWCFService
{
    private static ThirdPartyLib.ThirdPartyComClass ThirdParty;

    private static bool initCalled = false;
    private static int cntInit = 0;
    private static int cntTrans = 0;

    public TestWCFService()
    {
        if (ThirdParty == null)
        {
            ThirdParty = new ThirdPartyLib.ThirdPartyComClass();
        }
    }

    public bool InitialiseThirdParty(string strInit, out string strError)
    {
        try
        {
            if (!initCalled)
            {
                cntInit++;
                ThirdParty.Initialise(strInit);
                initCalled = true;
            }
            strError = "Call Num " + cntInit;
            return true;
        }
        catch (Exception ex)
        {
            strError = "ThirdParty.Initialise exception " + ex.Message + " 0n call number " + cntInit;
            return false;
        }
    }

    public bool ProcessInformation(string strRequestXML, int quoteMarker, out string strResponseXML, out string strError, out int quoteMarkerReturned)
    {
        try
        {
            cntTrans++;
            quoteMarkerReturned = quoteMarker;
            ThirdParty.ProcessInformation(strRequestXML, out strResponseXML);
            strError = "Call Trans Num " + cntTrans;
            return true;
        }
        catch (Exception ex)
        {
            strError = ex.Message + " On call trans num " + cntTrans;
            strResponseXML = "Error";
            quoteMarkerReturned = quoteMarker;
            return false;
        }
    }
}

配置:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.web>
    <compilation debug="true" />
  </system.web>
  <system.serviceModel>
    <bindings>
      <wsHttpBinding>
        <binding name="TestServiceBinding" bypassProxyOnLocal="true"
          useDefaultWebProxy="false">
          <readerQuotas maxDepth="524288" maxStringContentLength="524288"
            maxArrayLength="524288" maxBytesPerRead="524288" maxNameTableCharCount="524288" />
          <reliableSession inactivityTimeout="00:30:00" enabled="true" />
        </binding>
      </wsHttpBinding>
      <mexHttpBinding>
        <binding name="MEXTestServiceBinding" openTimeout="00:02:00"
          sendTimeout="00:02:00" />
      </mexHttpBinding>
    </bindings>
    <services>
      <service behaviorConfiguration="TestWcfServiceLibrary.TestWCFServiceBehavior"
        name="TestWcfServiceLibrary.TestWCFService">
        <endpoint address="" binding="wsHttpBinding" bindingConfiguration="TestServiceBinding"
          name="" contract="TestWcfServiceLibrary.ITestWCFService">
          <identity>
            <dns value="localhost" />
          </identity>
        </endpoint>
        <endpoint address="mex" binding="mexHttpBinding" bindingConfiguration="MEXTestServiceBinding"
          contract="IMetadataExchange" />
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:8731/Design_Time_Addresses/TestWcfServiceLibrary/TestWCFService/" />
          </baseAddresses>
        </host>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="TestWcfServiceLibrary.TestWCFServiceBehavior">
          <serviceMetadata httpGetEnabled="True"/>
          <serviceThrottling maxConcurrentCalls="100" maxConcurrentSessions="100" maxConcurrentInstances="100"/>
          <serviceDebug includeExceptionDetailInFaults="False" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
</configuration>

Answer 1

您的第三方COM组件很有可能是Apartment线程的，因此具有线程相似性。如果是这样，则COM组件中将只有一个线程在执行该工作。

无论服务实现使用了多少.NET线程，它们都必须排队才能使用特定的STA线程，后者是唯一能够调用COM对象的线程。