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Developing a Probing Pipeline Component

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Any pipeline component (general, assembling, or disassembling) can implement the IProbeMessage interface if it must support message probing functionality. A probing component is used in the pipeline stages that have FirstMatch execution mode. In such stages, the BizTalk Messaging Engine gives the beginning part of the message to the component to determine if the component recognizes the format of the message. If the component recognizes the format, the entire message is given to the component for processing.

The IProbeMessage interface exposes a single method, Probe, which enables the component to check the beginning part of the message. The return value determines whether this component is run. The following steps outline how the BizTalk Messaging Engine runs a stage that requires recognition:

  1. If the stage does not contain any components, the stage is not run and the message is given to the subsequent stages for processing.

  2. Check if the component implements the IProbeMessage interface. If not, the Messaging Engine invokes the component. The stage processing is done and the message is given to the next stage.

  3. The Probe method is invoked. If the return value is True, the component is run. Then the stage processing is done and the message is given to a next stage.

  4. The Messaging Engine gets the next component in the stage. If there are no more components and none of the components have been run, it generates an error that pipeline processing has failed. If there are no more components and at least one component has been run, the processing is done.

    If a stage does not require recognition (for example, the execution mode is All), the Messaging Engine invokes the component without first querying for the IProbeMessage interface and calling the Probe method.

See Also

Developing a General Pipeline Component
Developing an Assembling Pipeline Component
Developing a Disassembling Pipeline Component
Reporting Errors from Pipeline Components
Configuring Native Pipeline Components
Deploying Pipeline Components