Database Reference
In-Depth Information
Basic activities
The main steps of a BPEL process are performed by basic activities. The basic activ-
ities communicate with web services (receive, invoke, reply), change the content of
variables (assign), wait for a certain period (wait), or terminate the process (exit).
The following is a brief description of the basic activities:
•
Receive
:
• Part of the BPEL default template
• Waits for a client to make a request or processes asynchron-
ous callback responses from external services
•
Reply
• Part of the BPEL default template
• Sends message as Reply after completing the processes
•
Invoke
• A BPEL process uses Invoke to make service calls to partner
web services
• Invokes partner web services either synchronously or asyn-
chronously
Note
In synchronous invocation one needs to specify the input and output
variables, while in asynchronous invocation one needs to specify only
the input variables.
•
Transform
• It is an XSLT Mapper and maps source elements to target ele-
ments
