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Transaction support from SOA platforms

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What type of transaction support do current SOA platforms provide?

When it comes to transaction management, the key limitation in many Web services-based implementations is performing...

cross-service transactions. As long as a service is at the root of a transaction and the scope of the transaction is limited to activities that are performed by the service's underlying solution logic, there is no need for cross-service transaction functionality, and the transaction can be managed by whatever proprietary technology (component-based, legacy, or otherwise) it encapsulates. However, as the amount of services in an environment grows, the need to span transactions across those services increases. To address this requirement a set of WS-* specifications were developed a while ago.

First, the WS-Coordination specification provides a context management mechanism implemented through a set of stateful system services capable of logging information about and tracking the status of an on-going activity performed by a set of services that have registered to participate within this activity. Two supplementary specifications, WS-AtomicTransaction and WS-BusinessActivity, were developed to work in conjunction with WS-Coordination by providing business protocols to its generic context management features.

These protocols dictate the terms of the activity. WS-AtomicTransaction, for example, provides protocols for ACID-type transactions with two-phase capability. WS-BusinessActivity provides protocols for long-running transactions with compensation processes (as opposed to a rollback). Adoption of these specifications has been slow and gradual. They are expected to become increasingly important in the next 1-2 years. Microsoft's Indigo, for example, has already been promoted as supporting WS-AtomicTransaction.

This was last published in October 2005

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