Compensate Activities

Compensate activities provide business process logic to undo, or compensate for, completed logic occurring within a complex activity in a business process that encountered an exception.

A complex activity can contain only one compensation routine.

A compensation routine can be invoked explicitly or implicitly when a complex activity has completed.

• Compensation routines are explicitly invoked if a fault handler contains a compensate activity. The compensate activity is used to invoke a compensation routine on all inner complex activities that are direct children. Alternately, a compensate activity can be used to explicitly invoke the compensation routine on any single complex activity that is a descendent.
• Compensation routines are implicitly invoked if the complex activity encounters an unhandled exception. In this case, compensation routines are invoked on all complex activities that are direct children. Invocation of a compensate activity within a complex activity that does not have a compensation routine defined results in the implicit invocation of the compensate call on that complex activity.

Compensation routines are invoked in the reverse order of how the complex activities completed. A compensate activity contains a snapshot of the variables within its scope at the time the complex activity completed. The compensate activity within a specific complex activity is invoked for each successful completion of the complex activity.

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