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The interface used to inspect messages on the client side (IClientMessageInspector) exposes two methods. The BeforeSendRequest method is invoked prior to the message being sent to the service. The AfterReceiveReply method is invoked prior to the response from the service being processed. In the BeforeSendRequest method, the second parameter is an IClientChannel object. This object provides information about the channel into which the message will be sent and, unlike the Message object, it can be used with impunity. As for the Message parameter, notice that it is passed by reference. This allows a new Message object to be created and returned convenient, given that you need to do exactly that to work with the body of the Message object in this method. The value returned by BeforeSendRequest is a correlation object. It performs the same task as the correlation object in the parameter inspectors. It is an opaque object in that none of the elements in the WCF pipeline will care about the type or contents of the object. However, it is presented as one of the parameters in the AfterReceiveReply method. In the AfterReceiveReply method, two parameters are present. The Message object faces the same issues as with the BeforeSendRequest method: the body can t be processed directly. The
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Lesson 3: WCF Extensibility
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second parameter is the correlation object. This is the same object that was returned from the BeforeSendRequest method and can be used to match up the pre-call and post-call processing in these methods.
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Again, the interface used to implement message inspection on the server side has two methods, and the positioning of those methods within the pipeline is quite similar. The AfterReceiveRequest method is fired after the message has been received but prior to invoking the service operation, and the BeforeSendReply is called after the response has been constructed by the service operation. In terms of parameters, the AfterReceiveRequest method has the ever-present Message object as well as an IClientChannel object to provide information about the channel. The third parameter is the instance context for the current service object. The instance context exposes some details about the service that is processing this request. The value returned from the AfterReceiveRequest is the correlation object used on the dispatch side of the processing. This value will be returned into the correlationState parameter that is passed into the BeforeSendReply. The correlationState parameter is the second of two for this method, the other being the Message object.
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Adding Message Inspectors to the Pipeline
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You can choose from three ways to add a message inspector to either the client or the service side of the WCF pipeline. In general, you must do some coding to accomplish it. First, you must create a behavior. You add message inspectors to the pipeline by modifying the behavior of the service model at run time, so to add such an inspector, you must create a custom behavior. Further, because a behavior implements the IEndpointBehavior interface, what remains is, at a minimum, a class that implements the four methods that are part of IEndpointBehavior. The four methods, along with their purposes, are as follows:
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AddBindingParameters
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Adds the parameters required by this behavior to the binding at
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run time
ApplyClientBehavior
Provides the customization to the endpoint on the client side of
the request
ApplyDispatchBehavior Provides the customization to the endpoint on the service side of the request Validate Performs whatever validation is required to ensure that the endpoint is capable of supporting the applied behavior
If a message inspector is added, then the two methods that are mostly likely to be of interest are ApplyClientBehavior (to add inspection to the client side) and ApplyDispatchBehavior (to
6
Instrumentation
add inspection to the service side). The other methods will be implemented only if the particular inspector requires more information or needs some resource to be present to function. In terms of how to inject the inspector, the key is to find the appropriate run-time object. For the client side, the ClientRuntime object is passed into the ApplyClientBehavior as a parameter. On the service side, the DispatchRuntime object is available, but it s a little more hidden. The ApplyDispatchBehavior takes an EndpointDispatcher object as a parameter. On that object is a ServiceRuntime object. After you have found these run-time objects, the process of adding the message inspector is the same. It involves adding an instance of the inspector class (the class that implements the IClientInspector or the IDispatchInspector interfaces) to the MessageInspectors collection. For the following code, assume that a message inspector is implemented in a class called MessageLogInspector. More specifically, the MessageLogInspector class implements both the IClientInspector and the IDispatchInspector interfaces. The following code creates a behavior that injects the inspector into the WCF pipeline:
' VB Public Class LoggingEndpointBehavior Implements IEndpointBehavior Public Sub AddBindingParameters(endpoint As ServiceEndpoint, _ bindingParameters as BindingParameterCollection) _ Implements IEndpointBehavior.AddBindingParameters End Sub Public Sub ApplyClientBehavior(endpoint As ServiceEndpoint, _ clientRuntime As ClientRuntime) _ Implements IEndpointBehavior.ApplyClientBehavior Dim inspector As New MessageLogInspector() clientRuntime.MessageInspectors.Add(inspector) End Sub Public Sub ApplyDispatchBehavior(endpoint As ServiceEndpoint, _ dispatcher As EndpointDispatcher) _ Implements IEndpointBehavior.ApplyDispatchBehavior End Sub Public Sub Validate(endpoint As ServiceEndpoint) _ Implements IEndpointBehavior.Validate End Sub End Class // C# public class LoggingEndpointBehavior : IEndpointBehavior { public void AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection bindingParameters) { }
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