Sequence Activity in BPEL
This activity enables you to define a
collection of activities to be performed in sequential order.
For example, you
may want the following activities performed in a specific order:
·
A customer request is received in a
receive activity.
·
The request is processed inside a flow
activity that enables concurrent behavior.
· A reply message with the final approval
status of the request is sent back to the customer in a reply activity.
A sequence activity makes the assumption
that the request can be processed in a reasonable amount of time, justifying
the requirement that the invoker wait for a synchronous response (because this
service is offered as a request-response operation).
When this assumption cannot be made, it
is better to define the customer interaction as a pair of asynchronous message
exchanges.
When you double-click the Sequence
icon, the activity area shown in Figure A-36
appears. Drag and define appropriate activities inside the sequence activity.
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