ServiceThrottlingBehavior Class (System.ServiceModel.Description)

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Microsoft Visual Studio 2008/.NET Framework 3.5

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.NET Framework Class Library

ServiceThrottlingBehavior Class

Configures run-time throughput settings that enable you to tune service performance.

Namespace: System.ServiceModel.Description
Assembly: System.ServiceModel (in System.ServiceModel.dll)

Syntax

Visual Basic (Declaration)

Public Class ServiceThrottlingBehavior _
    Implements IServiceBehavior

Visual Basic (Usage)

Dim instance As ServiceThrottlingBehavior

public class ServiceThrottlingBehavior : IServiceBehavior

Visual C++

public ref class ServiceThrottlingBehavior : IServiceBehavior

JScript

public class ServiceThrottlingBehavior implements IServiceBehavior

Remarks

Use the ServiceThrottlingBehavior class to control various throughput settings that help prevent your application from running out of memory.

The MaxConcurrentCalls property limits the number of messages that currently process across a ServiceHost.

The MaxConcurrentInstances property limits the number of InstanceContext objects that execute at one time across a ServiceHost.

The MaxConcurrentSessions property limits the number of sessions a ServiceHost object can accept.

Because run-time load balancing requires experience running the application, using the ServiceThrottlingBehavior through an application configuration file is the most common method of modifying execution to maximize service performance.

Note:
A trace is written every time the value of these properties is reached. The first trace is written as a warning.

You can also set the values of this attribute by using the <serviceThrottling> element in an application configuration file.

Examples

The following code example shows the use of ServiceThrottlingBehavior from an application configuration file that sets the MaxConcurrentSessions, MaxConcurrentCalls, and MaxConcurrentInstances properties to 1 as an example. Real-world experience determines what the optimal settings are for any particular application.

<configuration>
  <appSettings>
    <!-- use appSetting to configure base address provided by host -->
    <add key="baseAddress" value="http://localhost:8080/ServiceMetadata" />
  </appSettings>
  <system.serviceModel>
    <services>
      <service 
        name="Microsoft.WCF.Documentation.SampleService"
        behaviorConfiguration="Throttled" >
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:8080/SampleService"/>
          </baseAddresses>
        </host>
        <endpoint
          address=""
          binding="wsHttpBinding"
          contract="Microsoft.WCF.Documentation.ISampleService"
         />
        <endpoint
          address="mex"
          binding="mexHttpBinding"
          contract="IMetadataExchange"
         />
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior  name="Throttled">
          <serviceThrottling 
            maxConcurrentCalls="1" 
            maxConcurrentSessions="1" 
            maxConcurrentInstances="1"
          />
          <serviceMetadata 
            httpGetEnabled="true" 
            httpGetUrl=""
          />
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
</configuration>

Inheritance Hierarchy

System..::.Object
System.ServiceModel.Description..::.ServiceThrottlingBehavior

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

Supported in: 3.5, 3.0

Reference

ServiceThrottlingBehavior Members

System.ServiceModel.Description Namespace