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CHAPTER 8 ■ IMPLEMENTING RELIABLE MESSAGING AND QUEUE-BASED COMMUNICATIONS 261ramrameshreddy.blog.comFigure 8-2. Selecting Add or Remove ProgramsClick Add/Remove Windows Components, and then select Application Server in the WindowsComponents Wizard, as shown Figure 8-3, and click the Details button.ramrameshreddyramrameshreddyFigure 8-3. Selecting Application Server
amrameshreddy.blog.com262 CHAPTER 8 ■ IMPLEMENTING RELIABLE MESSAGING AND QUEUE-BASED COMMUNICATIONSramrameshreddy.blog.comIf Message Queuing is not checked in the Application Server dialog box (as indicated inFigure 8-4), then check it and click the OK button. Then click the Next button in the WindowsComponents Wizard, and follow the instructions on the subsequent screens to install MSMQ.Figure 8-4. Selecting Message QueuingMicrosoft Message Queues in Windows Server 2007WCF abstracts out MSMQ, though the behavior of MSMQ itself has remained the same, withthe exception of MSMQ under Windows Server 2007. If you have worked with MSMQ in thepast, you will recognize the familiar queue and the dead letter queue (DLQ). The queue is theactive channel where MSMQ actually stores the messages that are relevant and that will beprocessed by the receiver application. The dead letter queue is where the messages end up ifthey have timed out or have become irrelevant.Windows Server 2007 also introduces the concept of a poison queue. A poison message isone that has exceeded the number of retries. (In other words, say a receiver application is tryingto process a message, but it encounters an error. In this scenario, the message queue willretry delivery until the timeout occurs. At this point, the message will end up in the DLQ. WithWCF on Windows Server 2007, a message will continue its set of retry attempts, and once thatis achieved, it will be put onto the poison queue.)In WCF, poison message handling provides a way for the receiving application to deal withpoison messages. The poison message handling is provided by the following properties ineach of the available queued bindings:ramrameshreddyramrameshreddyMaxImmediateRetries: An integer value that indicates the maximum number of times toretry delivery of the message from the main queue to the application. The default value is 5.MaxRetryCycles: An integer value that indicates the maximum number of retry cycles. Aretry cycle consists of putting a message back into the application queue from the retryqueue to attempt delivery again. The default value is Max Value or 2,147,483,647, which isthe largest possible value for an int32.
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amrameshreddy.blog.comTHE EXPERT’
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amrameshreddy.blog.comPro WCF: Prac
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amrameshreddy.blog.comApplying Beha
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amrameshreddy.blog.comxii ■CONTEN
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amrameshreddy.blog.comxiv ■CONTEN
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amrameshreddy.blog.comxviii ■FORE
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amrameshreddy.blog.comxx ■ABOUT T
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amrameshreddy.blog.comxxviii ■INT
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amrameshreddy.blog.com4 CHAPTER 1
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amrameshreddy.blog.com426 APPENDIX
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amrameshreddy.blog.com456 ■INDEXr
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