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Activity propagation and faults
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Traces that occur while in the middle of processing a fault follow the same rules for activity propagation as was just described for regular processing. There is no special change in how and when the activity identifier is passed across boundaries if the message indicates an error condition instead of a normal condition.
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In WCF, activity propagation is not sufficient. There are times when an activity will perform an action that causes a new activity to be created. If the trace simply displayed the new ActivityId, how would one be able to follow the flow of traces emitted In WCF, the answer is an activity transfer. A transfer between two activities is a representation of a causal relationship between events within an endpoint. Typically, there is a flow of control between the activities, such as a method call that crosses the activity boundaries or when bytes are inbound to a service. A Listen At activity is part of the listening function for a service. When the bytes arrive, a message object is created, but this object creation is part of the Receive Bytes activity. A transfer is set up between the Listen At and Receive Bytes activities. Although it might appear to be a requirement, there does not have to be a nested relationship between the activities that are on either side of a transfer. Consider a situation in which there
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Lesson 2: End-to-End Tracing
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are two activities, named A and B. As part of its processing, A creates a transfer to B. At the time, B might already exist. B could perform some work for A and then return, with B continuing on to do work for other activities. In this scenario, although there is a transfer relationship between A and B, there is no nesting. Further, there is no requirement that a transfer from A to B necessarily be followed by a transfer back from B to A. A could certainly spawn B, but if the method is OneWay, A will not expect to hear back from B. In such a scenario, the activities will continue on, even though the transfer will be left in the trace log for viewing in the future. Just to complete the discussion of transfers, following are the steps that occur when a transfer is made between A and B (and B doesn t already exist). 1. A new activity is created. This includes the generation of a new gAId. 2. A Transfer trace is emitted. The source is the original gAId. The destination is the new gAId. 3. The new ActivityId is stored in TLS. 4. A Start trace for the new activity is generated. After the B activity is finished, the following steps occur: 1. A Transfer trace is emitted. The source is Activity B s gAId, and the destination is Activity A s gAId. 2. A Stop trace is emitted to indicate that Activity B is complete. 3. The TLS is updated with Activity A s gAId. The following code demonstrates these steps:
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' VB Dim ts As New TraceSource("DemoTraceSource") Dim firstActivityId As Guid = Guid.NewGuid() Trace.CorrelationManager.ActivityId = firstActivityId ts.TraceEvent(TraceEventType.Start, 0, "Start Activity") ' processing code Dim newActivityId As Guid = Guid.NewGuid() ts.TraceTransfer(0, "Transferring ", newActivityId) Trace.CorrelationManager.ActivityId = newActivityId ts.TraceEvent(TraceEventType.Start, 0, "Get Header") ' more processing code ts.TraceEvent(TraceEventType.Information, 0, "Stuff happened") ' more processing code ts.TraceTransfer(666, "Transferring...", firstActivityId) ts.TraceEvent(TraceEventType.Stop, 0, "Get Header") Trace.CorrelationManager.ActivityId = firstActivityId // C# TraceSource ts = new TraceSource("ClientCalculatorTraceSource"); Guid firstActivityId = Guid.NewGuid(); Trace.CorrelationManager.ActivityId = firstActivityId;
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ts.TraceEvent(TraceEventType.Start, 0, "Start Activity"); // processing code Guid newActivityId = Guid.NewGuid(); ts.TraceTransfer(0, "Transferring...", newActivityId); Trace.CorrelationManager.ActivityId = newActivityId; ts.TraceEvent(TraceEventType.Start, 0, "Get Header"); // more processing code ts.TraceEvent(TraceEventType.Information, 0, "Stuff happened"); // more processing code ts.TraceTransfer(666, "Transferring ", firstActivityId); ts.TraceEvent(TraceEventType.Stop, 0, "Get Header"); Trace.CorrelationManager.ActivityId = firstActivityId;
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