Step | Description |
1 | Integration Server requests documents for a trigger from the messaging provider. |
2 | Integration Server receives documents for the trigger, including documentA and documentB. Both documentA and documentB have the same activation ID. |
3 | Integration Server places documentA and documentB in the trigger’s queue on Integration Server. |
4 | Integration Server pulls documentA from the trigger queue and evaluates the document against the conditions in the trigger. Integration Server determines that documentA partially satisfies an All (AND) join condition. Integration Server moves documentA from the trigger queue to the join manager. Integration Server starts the join time-out period. Note: If exactly-once processing is configured for the trigger, Integration Server first determines whether the document is a copy of one already processed by the trigger. Integration Server continues processing the document only if the document is new. |
5 | The join manager saves documentA to the ISInternal database. Integration Server assigns documentA a status of “pending.” Integration Server returns an acknowledgement for the document to the messaging provider. |
6 | Integration Server pulls documentB from the trigger queue and evaluates the document against the conditions in the trigger. Integration Server determines that documentB partially satisfies an All (AND) join condition. Integration Server sends documentB from the trigger queue to the join manager. |
7 | The join manager determines that documentB has the same activation ID as documentA. Because the join time-out period has not elapsed, the All (AND) join condition is completed. The join manager delivers a join document containing documentA and documentB to the trigger service specified in the condition. |
8 | Integration Server executes the trigger service. |
9 | After the trigger service executes to completion (success or error), one of the following occurs: If the service executes successfully and documentB is guaranteed, Integration Server acknowledges receipt of documentB to the messaging provider. Integration Server then removes the copy of the documentA from the ISInternal database and removes the copy of documentB from the trigger queue. If a service exception occurs, the service ends in error and Integration Server rejects the join document. If documentB is guaranteed, Integration Server acknowledges receipt of documentB to the messaging provider. Integration Server then removes the copy of the documentA from the ISInternal database and removes the copy of documentB from the trigger queue. Integration Server sends an error notification document to the publisher. If the trigger service catches a transient error, wraps it, and re-throws it as an ISRuntimeException, then Integration Server waits for the length of the retry interval and re-executes the service using the original document as input. If Integration Server reaches the maximum number of retries and the trigger service still fails because of a transient error, Integration Server treats the last failure as a service error. For more information about retrying a trigger service, see webMethods Service Development Help. Note: A transient error is an error that arises from a condition that might correct itself later, such as a network issue or an inability to connect to a database. |