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Whether activities can be propagated is defined in the source. Consider the following configuration file, which uses the propagateActivity attribute (shown in bold) to allow activities to be transferred across service boundaries:
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<system.diagnostics> <sources> <source name="System.ServiceModel" switchValue="ActivityTracing" propagateActivity="true"> <listeners>
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Lesson 2: End-to-End Tracing
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<add name="log" type="System.Diagnostics.XmlWriterTraceListener" initializeData="c:\log\Traces.svclog" /> </listeners> </source> </sources> </system.diagnostics>
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Notice first (very important), that propagateActivity is set on the System.ServiceModel source. This is necessary for activities to propagate across endpoints. Also, as it turns out, propagation of activities requires more than just setting the propagateActivity attribute to true. A number of specific conditions need to exist for activity propagation to take place. For Activity A to be propagated to Activity B, all the following must be true. Activity B must be created because of some request or action by Activity A. The gAId for Activity A must be known to Activity B. The gAId for Activity B must be the same as Activity A. If these conditions are met, the gAId will be passed through the ActivityId message header. Activity Tracing Enabled When the ServiceModel activity tracing is enabled (ActivityTracing is set to true), there are two parts of the requests where activity functionality occurs, and both of them revolve around the ProcessAction information that is included with a message. On the client, every operation call is processed within the context of a ProcessAction activity. This is just a built-in identifier that can be used to correlate tracing activity within a single operation. When the client builds the request that is to be sent to the service, it determines, based on whether the current activity should be propagated, what value should be provided. If no activity is to be propagated, no value is provided for the ProcessAction. Regardless of the value to be sent, it is included within the SOAP header portion of the request. On the receiving end, WCF looks at the SOAP header for a ProcessAction value. If the message contains ProcessAction with an ID, the ActivityId within the service is set to the same value. This allows the activity to be transferred across the boundary. If, however, there is no ProcessAction ID (which occurs if the client has propagateActivity set to false), the service will generate a new GUID and assign that value to the service-side ActivityId. This has the effect of creating a new activity. How the client side of the WCF connection deals with the ActivityId is a little more complicated. Remember that the activity does not have to start in the client for it to be propagated back to the client. In other words, the activity could be created in the service and sent back to the client, where any additional traces would need to be correlated. If the client is running as a synchronous, single-threaded application, any activity identifier included in the response is ignored. Instead, the activity that is associated with the request is used. If the client is either asynchronous or multithreaded, the propagateActivity value is set to
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true, and the response from the service includes an ActivityId, the service s value indicates the activity associated with any further trace messages. Activity Tracing Disabled The second part of the propagation puzzle is when the ServiceModel activity tracing is disabled (ActivityTracing=false). Again, the value of the propagateActivity flag in the service model must be considered as well. When propagateActivity is set to true, the behavior on the client and the service are the same. However, the behavior applies to user-generated traces only. Traces that come out of the ServiceModel class will not be part of the same activity. As the request is being formed (or the response is being built), the ActivityId in TLS will be used for any traces. As soon as the request passes into the ServiceModel classes, the ActivityId will not appear in any traces. However, the user-generated ActivityId will be included in the headers for the message. On the receiving end, the ActivityId is pulled from the message as soon as the message object is created. That ActivityId will be used for any user-generated traces. However, it will not appear in any traces that are created in the ServiceModel classes unless the traces are executed in the same thread as the user-generated code. The purpose for these gyrations is to allow user-created activities to be propagated in the same manner as ServiceModel activities. It does not guarantee that the ServiceModel traces will be in the same activity as the user-generated traces, although it might be in some cases.
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