Tuesday, May 3, 2011

WCF: How do I add a ServiceThrottlingBehavior to a WCF Service?

I have the below code for returning back an instance of my WCF Service ServiceClient:

    var readerQuotas = new XmlDictionaryReaderQuotas()
    {
        MaxDepth = 6000000,
        MaxStringContentLength = 6000000,
        MaxArrayLength = 6000000,
        MaxBytesPerRead = 6000000,
        MaxNameTableCharCount = 6000000
    };


    var throttlingBehaviour = new ServiceThrottlingBehavior(){MaxConcurrentCalls=500,MaxConcurrentInstances=500,MaxConcurrentSessions = 500}; 
    binding = new WSHttpBinding(SecurityMode.None) {MaxReceivedMessageSize = 6000000, ReaderQuotas = readerQuotas};

    dualBinding = new WSDualHttpBinding(WSDualHttpSecurityMode.None)
                      {MaxReceivedMessageSize = 6000000, ReaderQuotas = readerQuotas};

    endpointAddress = new EndpointAddress("http://localhost:28666/DBInteractionGateway.svc"); 

    return new MusicRepo_DBAccess_ServiceClient(new InstanceContext(instanceContext), dualBinding, endpointAddress);

Lately I was having some trouble with timeouts and so I decided to add a throttling behavior, like such:

    var throttlingBehaviour = new ServiceThrottlingBehavior () {
        MaxConcurrentCalls=500, 
        MaxConcurrentInstances=500,
        MaxConcurrentSessions = 500
    };

My question is, where in the above code should I add this throttlingBehaviour to my MusicRepo_DBAccess_ServiceClient instance?


From some of the examples I found on the web, they are doing something like this:

ServiceHost host = new ServiceHost(typeof(MyService));
ServiceThrottlingBehavior throttleBehavior = new ServiceThrottlingBehavior
{
    MaxConcurrentCalls = 40,
    MaxConcurrentInstances = 20,
    MaxConcurrentSessions = 20,
};
host.Description.Behaviors.Add(throttleBehavior);
host.Open();

Notice that in the above code they are using a ServiceHost whereas I am not, and they are then opening it (with Open()) whereas I open the MusicRepo_DBAccess_ServiceClient instance...and this is what got me confused.

From stackoverflow
  • You can specify the behavior in the configuration file afaik, and the generated client will obey, using behaviors.

    Some configuration sections excluded for brevity

    <service 
        behaviorConfiguration="throttleThis" />
    
            <serviceBehaviors>
                <behavior name="throttleThis">
                    <serviceMetadata httpGetEnabled="True" />
                    <serviceThrottling
                        maxConcurrentCalls="40"
                        maxConcurrentInstances="20"
                        maxConcurrentSessions="20"/>
                </behavior>
            </serviceBehaviors>
    
  • Throttling is a service side (server) behavior not client side one

    Arnon

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