WCF: How do I add a ServiceThrottlingBehavior to a WCF Service?
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16-09-2019 - |
Question
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.
Solution
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>
OTHER TIPS
Can be done in code for those, like me, who configure at runtime.
vb version:
Dim stb As New ServiceThrottlingBehavior
stb.MaxConcurrentSessions = 100
stb.MaxConcurrentCalls = 100
stb.MaxConcurrentInstances = 100
ServiceHost.Description.Behaviors.Add(stb)
c# version:
ServiceThrottlingBehavior stb = new ServiceThrottlingBehavior {
MaxConcurrentSessions = 100,
MaxConcurrentCalls = 100,
MaxConcurrentInstances = 100
};
ServiceHost.Description.Behaviors.Add(stb);
Throttling is a service side (server) behavior not client side one
Arnon