An Introduction to BPEL standard and its extentions - SoberIT

ParentProcessCall...partnerLink=”PL”requestOperation= “op1”responseOperation= “op2”Op1Sub-ProcessOp2PT2PLPT1Figure 4.2: Receive-invoke invocation mechanisms [15]The parent process uses call activity to call sub-process. The call activity specifies the port type which isused to send the input message to sub-process and port type which contains the operation to be used bysub-process to return a message. Several parent processes can call same sub-process, which means subprocessneeds to return message to different endpoints. Therefore it is important that those endpoints inparent processes are recognizable by the process engine hosting sub-process, so that response messagecan be sent back successfully [15].4.5 Coordination scenariosThere are seven coordination scenarios between a parent process and a sub-process (Figure 4.3)[15]Parent processRequest operationResponse operationCloseCloseSub-processFigure 4.3a Invocation of sub-process without compensationSub-process is invoked and message is returned. After parent process is completed, sub-process is closed.