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Instrumentation
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The DemoService project, a simple WCF service library that implements the IGetHeaders interface. This interface consists of a single method (GetHeaders) that retrieves some information about the headers in the message sent to the service. For this exercise, it returns the Action header. The TestClient project, a Console application that enables you to consume the DemoService service. This client is the target for your tracing. 2. In Solution Explorer, double-click the app.config file for the TestClient project. Notice that initially the file contains some basic binding configuration information. To start, you must define the source for the trace by adding a sources element to the app.config file. The sources element is a part of the system.diagnostics element. 3. Add the following segment above the existing system.serviceModel element:
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<system.diagnostics> <sources> <source name="System.ServiceModel.MessageLogging" switchValue="Information, ActivityTracing"> </source> </sources> </system.diagnostics>
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Along with defining the source, you must create a listener. One of the ways to do this is to add a listener tag within the source tag. 4. Add the following XML segment to the body of the just-added source tag:
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<listeners> <add name="log" type="System.Diagnostics.XmlWriterTraceListener" initializeData="Traces.svclog" /> </listeners>
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At this point, the source is set up and ready to go. It includes the switch values, indicating the level of information to be traced, along with a listener that directs the output, in an XML format, to a file. However, the information published into the trace is not automatically pushed into the file immediately. Instead, the trace information is buffered, which, in the case of this exercise, means that it might not be visible. 5. To address this problem, set the autoflush property on the trace to true by adding the following XML element below the closing tag for the sources element in the app.config file:
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<trace autoflush="true" />
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You have completed three of the four steps. The final step is to turn message logging on for WCF through the messageLogging element. 6. Add the following element to the system.serviceModel element within the app.config file:
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<diagnostics> <messageLogging logEntireMessage="true" logMalformedMessages="false" logMessagesAtServiceLevel="false"
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Lesson 1: Basic WCF Tracing
logMessagesAtTransportLevel="true" maxMessagesToLog="3000" maxSizeOfMessageToLog="2000"/> </diagnostics>
Now you can run the application and view the tracing information. 7. Ensure that TestClient is set as the startup project, and then launch the application by pressing F5. A Console window appears, indicating that the client has successfully communicated with the service. 8. Press Enter to exit the application. 9. To see the trace that was created, use Windows Explorer to navigate to the directory where the TestClient application ran, which is at <InstallHome>/6/Lesson1 / Exercise1/<language>/Before/TestClient/bin/Debug. You will see a newly added file called Traces.svclog. If you open the file, using any text editor, a large and fairly convoluted XML document is visible. 10. While you are in Windows Explorer, delete the file. Next, you define a filter on the data captured in the trace file by adding a filters element to the messageLogging element. 11. Replace the current messageLogging element with the following XML segment to include only messages that have an action that starts with http://schemas.xmlsoap.com in the trace log file:
<messageLogging logEntireMessage="true" logMalformedMessages="false" logMessagesAtServiceLevel="false" logMessagesAtTransportLevel="true" maxMessagesToLog="3000" maxSizeOfMessageToLog="2000"> <filters> <add xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:a="http://www.w3.org/2005/08/addressing"> /soap:Envelope/soap:Header/a:Action[ starts-with(text(),'http://schemas.xmlsoap.org')] </add> </filters> </filters> </messageLogging>
12. Launch the application by pressing F5. A Console window appears, indicating that the client has successfully communicated with the service. 13. Press Enter to exit the application.
6
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14. Use Windows Explorer to navigate to the <InstallHome>/6/Lesson1/Exercise1 /<language>/Before/TestClient/bin/Debug directory. 15. You will see a newly created file called Traces.svclog. As before, use Windows Explorer to delete the file. To see the impact of the filter, go back to the app.config file in Visual Studio 2008. 16. Modify the XPath query, which is used to filter the message. This was originally added in step 11. Change the action so that it looks for tempuri.org . The filters section in app.config file should be changed to look like the following:
<filters> <add xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:a="http://www.w3.org/2005/08/addressing"> /soap:Envelope/soap:Header/a:Action[ starts-with(text(),'http://tempuri.org')] </add> </filters>
In the messages for this application, none of the actions include http://tempuri.org . So when the application is run, the Traces.svclog file will not be created. 17. Launch the application by pressing F5. 18. When the Console window displays the header information, press Enter to terminate the application. 19. Use Windows Explorer to navigate to the <InstallHome>/6/Lesson1/Exercise1 /<language>/Before/TestClient/bin/Debug directory. You will see that no traces.svclog has been created.
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