Implementation of an Error Component in VS .NET

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Listing 10-5 Implementation of an Error Component
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[ConstructionEnabled(true, Default="d:/demos/MessageLogtxt")] public class ErrorHandlerCourseControl: ServicedComponent, IPlaybackControl, IQueueableCourseRegistration
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{ private string errorFileName; protected override void Construct(string s) { errorFileName = s; } public void FinalServerRetry() { SystemDiagnosticsEventLogWriteEntry( "Course Services", "Server error with queued component; logfile: " + errorFileName); } public void FinalClientRetry() { SystemDiagnosticsEventLogWriteEntry( "Course Services", "Client error sending message to the queue; logfile: " + errorFileName); } public void RegisterCourse(string xmlCourseRegistration) { StreamWriter writer = FileAppendText(errorFileName); writerWriteLine(xmlCourseRegistration); writerWriteLine(""); writerClose(); } }
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The error component must be associated with the queued component class This is done by using the attribute [ExceptionClass] The name of this attribute is somewhat misleading, however, because the class defined with this attribute is not a NET exception class (that is, it does not inherit from SystemException) However, if this class is instantiated, it is an exception outside of the normal program flow Listing 10-6 shows the attribute [ExceptionClass] applied to the class CourseControl that was created earlier The constructor of this attribute class defines the progid of the error handler class The default-generated progid of the error component is the name of the class, including the namespace
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Listing 10-6 Using the [ExceptionClass] Attribute
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[ExceptionClass("SamplesCoursesServices" + "ErrorHandlerCourseControl")] public class CourseControl: ServicedComponent, IQueueableCourseRegistration { //
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After you have registered the serviced component with the attribute [ExceptionClass], you can see the error class in the Component
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Services Explorer, as shown in Figure 10-13
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Figure 10-13 Exception class for queued components
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To test the error component, you can modify the code of the RegisterCourse method to create an exception You can also stop the database or do something else to make the serviced component fail On doing this, you can see the message moving from one queue to another with the Computer Management tool Remember to refresh the queues in this tool so that you can see the actual messages Be aware that the error recovery takes a while and that before the error component is invoked, the message is moved from one private queue to the other Within every active private message queue, the message is retried several times, and the time between the retries
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Transactional Queues
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In 7, "Transaction Services," and in 8, "Compensating Resource Management," transactions were discussed Queued components can participate in the same transaction as a normal transactional serviced component With queued components, transactional queues are automatically created, as shown earlier in Figure 10-7, where a label is set to Transactional Queue Queued components seem to contradict the characteristics of transactions because transactions should only be active for a short time With message queuing, the time from sending the message to receiving the message can take a while The transfer can be completed in fractions of a second, but it can also span minutes, days, or weeks Such a behavior of messaging fits with transactional characteristics, because the transaction does not span sending and receiving of the message Instead, multiple transactions are used with message queuing Figure 10-14 shows the three transactions that are used with message queuing
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Figure 10-14 Transactions with queued components
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The first transaction just spans writing the message to the message queue on the client system The recorder automatically creates a transactionif one does not already exist As you can see in the figure, the transaction can span another component that writes data to a [12] file or a database If the file cannot be created, the message is not sent to the message queue, or vice versa You can create a transaction for the client by using a transactional serviced component that also invokes methods with the queue moniker, or you can create a transaction with the services without component technology The second transaction is created when the message is moved from the source to the target queue As soon as the target queue can be reached, a transaction is created This way, if the message cannot be moved to the target queue, the message is not lost The third transaction happens when the message is read from the target queue to invoke the method with the queued component The player automatically enlists a transaction in the DTC If the queued component is also marked with a transactional setting such as transactionOptionRequired, reading the message and writing to the database will be enlisted in the same transaction If writing to the database fails, the message is rolled back to the queue
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