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Enabling Message Logging
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The last of the four steps involves the configuration file. To enable WCF message logging, the messageLogging element must be added to the diagnostics section of the configuration file. The following is an example of such an element:
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<system.serviceModel> <diagnostics> <messageLogging logEntireMessage="true" logMalformedMessages="false" logMessagesAtServiceLevel="true" logMessagesAtTransportLevel="false" maxMessagesToLog="3000" maxSizeOfMessageToLog="2000"/> </diagnostics> </system.serviceModel>
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WCF logs messages at two levels: Messages are logged as they are entering user code (in the receive side) or as they leave user code (in the send side). At the service level, all messages, including most infrastructure messages, are logged. The exception in the infrastructure messages are that ReliableMessaging messages are not logged. Transport level Messages are logged as they are ready to be encoded or decoded; at the transport level, all infrastructure messages are logged, even those related to reliable messaging.
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Beyond these two levels, WCF also logs malformed messages. A malformed message is one that is rejected by any part of the WCF stack. Every malformed message is logged as is. If the message is encrypted, the encrypted version is logged. If the XML that forms the message is invalid, that invalid XML is logged. As you can see from the configuration segment shown previously, there are a number of attributes that can be defined for the messageLogging element. Table 6-3 lists the messageLogging attributes and descriptions of their functions.
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Table 6-3
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MessageLogging Attributes
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Description A Boolean value that indicates whether the entire message should be logged. If set to the default value, which is false, only the header will be logged. A Boolean value that indicates whether malformed messages should be logged. A Boolean value that indicates whether service-level messages should be logged.
Attribute logEntireMessage
logMalformedMessages logMessagesAtServiceLevel
logMessagesAtTransportLevel A Boolean value that indicates whether transport-level messages should be logged. maxMessageToLog An integer value that sets a quota on the number of messages that will be logged. Every message that is logged applies to the quota. As soon as the quota is reached, an additional message is posted indicating that the quota has been reached and no further messages are logged. Specifies the maximum size (in bytes) of the messages that will be logged. If a message is larger than the specified value, it will not be placed into the log. The default value is 256Kb.
maxSizeOfMessageToLog
Lesson 1: Basic WCF Tracing
NOTE
When max is not the max
The maxSizeOfMessageToLog attribute specifies the limit on the size of logged message prior to serialization. It is quite likely that, when serialized, the message will be larger. So when calculating the impact of the messages on storage space, it is a good idea to expect a serialization inflation of approximately 10 percent.
Part of the message-logging infrastructure for WCF is the ability to filter the messages that are logged. This is configured through a filters element that is associated with the messageLogging element, as shown here:
<messageLogging logEntireMessage="false" logMalformedMessages="true" logMessagesAtServiceLevel="true" logMessagesAtTransportLevel="false" maxMessagesToLog="100"> <filters> <add nodeQuota="10" xmlns:soap="http://www.w3.org/2003/05/soap-envelope"> /soap:Envelope/soap:Header </add> </filters> </messageLogging>
The add element adds a filter to message logging. The basic idea is to specify an XPath query in the body of the add element. If at least one match is found when this XPath is applied to the headers of a message, the message is logged. The nodeQuota attribute limits the number of nodes that are searched to find the match. The xmlns attribute, along with the contents of the add element, define the matching criteria.
Lab: Capturing a Basic Trace
In this lab, the focus is on basic tracing functionality. In particular, the exercise describes how to configure WCF to generate some basic trace information. One thing to keep in mind is that, although the trace information is being generated in this exercise, the detailed evaluation of the trace log is deferred until Lesson 2, End-to-End Tracing. Exercise 1 Set Up the Trace In this exercise, you will configure a basic trace. The data goes into a log file placed in the root directory. 1. Navigate to the <InstallHome>/6/Lesson1/Exercise1/<language>/Before directory and double-click the Exercise1.sln file to open the solution in Visual Studio. The solution consists of two projects. You might recognize the projects as the same ones used in 5, Configuring WCF. They are as follows:
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