Journal in .NET framework

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Journal
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Parameter Priority
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Description With the Priority parameter, you can set a value in the range0 (MQ_MIN_PRIORITY) to 7 (MQ_MAX_PRIORITY) that is used to read the message with the highest priority first The default value is 3 (MQ_DEFAULT_PRIORITY) With transactional queues, setting the priority is not possible
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PrivLevel
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The privacy level defines how much of the message should be encrypted using the encryption algorithm that is defined with the EncryptAlgorithm parameter With the values BODY_ENHANCED, BODY, or NONE, you can define whether the complete message, only the body, or nothing should be encrypted
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TRace
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If you turn tracing on with the value 1 (MQMSG_SEND_ROUTE_TO_REPORT_QUEUE), a trace of the route is written to the report queue By default, tracing is set to 0 (MQMSG_TRACE_NONE)
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Error Handling
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With queued components, you cannot get errors directly by calling the method of the queued component, because the method will only be recorded and will play at a later time Errors can occur when the message is sent into the queue, or when the message is received from the queue You have already learned in this chapter about the dead-letter queue, which receives messages either when the message cannot be sent, or when the message cannot be received after a timeout Queued components have an automatic mechanism to deal with errors on both the client and the server side You can create a custom error component that implements the interface IPlaybackControl, which you can find in the namespaceSystemEnterpriseServices The error component itself is a serviced component that can be installed on both the client and the server systems The interface IPlaybackControl defines different methods for dealing with errors on the client and on the server:FinalClientRetry and FinalServerRetry The method FinalClientRetry is called with client-side errors, when the message cannot be delivered to the target queue before the timeout is reached If the message cannot be delivered to the target queue, the message is put into the dead-letter queue of the client system, and the method FinalClientRetry is called For a server-side error, if calling the methods of the queued components failed (for example, because of incorrect parameters, or because of erroneous data access), the method FinalServerRetry is invoked FinalClientRetry and FinalServerRetry are not the only methods where you can do the recovery; in fact, with these methods, there is not a lot you can do at all The real error recovery can be done in the methods that are called after the methods of the IPlaybackControl interface, as the error recovery mechanism invokes the same methods in the error component that were called with the erroneous component The error component must therefore implement the same interface as the serviced component that is doing the normal work, although the implementation can differ Here you can do some recovery actions, or create an e-mail that is sent to the system administrator If the methods of the error component succeed, the message is removed from the dead-letter queue A sample implementation of the error component is shown in Listing 10-5 The class ErrorHandlerCourseControl implements the interfaces IPlaybackControl and IQueueableCourseRegistration This error component just writes the failing information to a log file; the name of the file is defined with the construction string of the serviced component class [11]
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In the IPlaybackControl methods FinalServerRetry and FinalClient-Retry, an entry is just written to the Windows event log What is more important with the error component is that it implements the interface IQueueableCourseRegistrationthe same interface that was implemented by the normal serviced component class CourseControl (Listing 10-3) Of course, here the implementation of this method is different Instead of writing the course registration information to the database, it is written to a simple file With the information in the file and the event log entry (you could also create an e-mail), the system administration can take any necessary actions
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