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CHAPTER 4 MESSAGING AND PIPELINES
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Pipelines are the first line of processing before a message is received by the BizTalk MessageBox or before the message is received by a target system. Out-of-the-box functionality supports the ability to perform straightforward processing of messages. There may be situations that require more complex processing, data validation, or interaction with .NET objects. In those situations, implementing a custom pipeline component offers the flexibility of adding processing logic within the BizTalk framework. The main function required for implementing a custom pipeline component is the Execute function in the IComponent interface. The other interfaces serve for design-time and component interactions with the runtime engine. Manipulation of the inbound message requires making a copy of the inbound message stream, as the inbound message stream is read-only. Before a memory stream can be returned to the IBaseMessage.Data object, it must be rewound, as the BizTalk pipeline engine does not perform this function. You should also clean up memory stream objects by adding the object to the pipeline resource tracker.
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Note There are several pipeline component creation tools available on the Internet that may be used to reduce
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overall coding effort.
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4 9. Handling Pipeline Errors
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Problem
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You need to implement custom logic within a pipeline for an integration solution you are building. Based on the solution s requirements, message delivery must be guaranteed, with no messages being lost once they are received by BizTalk Server. Any errors within the custom pipeline must result in a notification e-mail being sent to the appropriate system administrators.
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Solution
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BizTalk Server 2010 has some very convenient, easy-to-use error-handling functionality called error reporting, which enables simplified handling of pipeline (and other) errors. Error reporting is specified on receive and send ports within the BizTalk Administration Console, as shown in Figure 4 25. By enabling this feature on a port, you instruct BizTalk Server to take a number of steps in the event an error is encountered during message processing (which includes adapter, pipeline, mapping, and routing processing). Specifically, a clone of the errored message is created, with all the original promoted properties demoted. The message does, however, have the appropriate error reporting properties promoted, such as the failure code and receive port/send port name. This message is then delivered to the MessageBox, and can be subscribed to by an SMTP send port via the error reporting promoted properties. This SMTP send port can be configured to deliver notification messages to a system administrator.
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CHAPTER 4 MESSAGING AND PIPELINES
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Figure 4 25. Configuring error reporting on a send port
Note If error reporting is enabled, and an error occurs when BizTalk Server attempts to deliver the cloned
message to the MessageBox, the original message is placed in the suspended queue.
How It Works
Error reporting allows a variety of receive/send port errors to be trapped and managed. The details of the error are promoted as properties on a copy of the original message, which is sent to the MessageBox database. This allows you to handle error messages just like any other message: via subscriptions. You can define error-handling mechanisms specific to a single integration point, an application, or an entire BizTalk environment. Your error-handling mechanisms can be a simple notification e-mail (as shown in this solution), or a complex set of processes implemented as orchestrations. The Error Reporting properties are available on Filters in send ports and orchestrations (See Figure 4 26). This allows messages to be routed to the appropriate destinations.
CHAPTER 4 MESSAGING AND PIPELINES
Figure 4 26. The Error Report properties available in filters Table 4 8 shows the error-reporting properties promoted on errored messages. Table 4 8. Error-Reporting Properties Promoted on Errored Messages
Property
FailureCode FailureCategory MessageType
Description
The code identifying the error. The category of the failure. The BizTalk message type of the failed message. This property may be empty if BizTalk Server could not determine the type of message. The name of the receive port where the failure occurred. This property is populated and promoted only if the failure occurred on a receive port. The URI of the receive location where the failure occurred. This property is populated and promoted only if the failure occurred on a receive port.
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