Compensating resource managers

摘要

A compensating resource manager provides a mechanism for more easily integrating non-transactional durable resources to participate in transactions within a component-based on-line transaction processing system, as well as resources having transaction processing support not conforming to the transaction processing system. The durable resource is integrated using the compensating resource manager by developing two simple components, a worker component that implements a normal action on the resource and a compensator component that implements a compensating action that reverses the normal action on the resource. The worker component uses system-provided services to register its respective compensator component and to log information, such as on a write-ahead basis, to allow the compensator component to reverse its normal action. The system-provided service enlists in a transaction in which the worker component performs its normal action to receive two phase commit notifications for the transaction, and responsive thereto creates the compensator component to perform appropriate clean-up or compensating action according to the logged information depending on whether the transaction commits or aborts.