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Callback event processing for event delivery with XA transaction

To provide data integrity and to make sure events are not delivered more than

once, which would cause errors in the downstream system in the integration

scenario, the invention provides a mechanism to achieve once-and-only delivery

and the same is accomplished using XA transaction.

When assured delivery is required, the basic flow described in Callback event

processing for basic delivery becomes more complex. For more complex scenarios,

CallbackEventSender creates an instance of XA to bring the delivery under a new

transaction. The beforeDevliery() call to endpoint is the starting point of XA

transaction and it will last till afterDelivery(). If problems occur within this

transaction scope, a proper rollback mechanism will ensure data integrity is

maintained.

XA transaction will be active and supported only when the adapter is configured

with one EndpointFactory.

94 WebSphere Adapters: WebSphere Adapter Toolkit User Guide

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Ibm WebSphere Adapters Manuale Utente Pagina 100