BPEL - Synchronous Interactions

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The Client BPEL Process sends a request to the Service BPEL Process (d1 in the below figure), and receives an immediate reply (d2 in the below figure). For example, a user requests a subscription to an online application form for admission to a college and immediately receives email confirmation that their request has been accepted.

Synchronous Interactions

  • The Client BPEL Process needs an invoke activity. The port on the client side sends the request and receives the reply.

  • The Service BPEL Process needs a receive activity to accept the incoming request, and a reply activity to return either the requested information or an error message (a fault; f1 in the below figure) defined in the WSDL.

  • As with all partner activities, the Web Services Description Language (WSDL) file defines the interaction. The WSDL file is as shown below.

WSDL File

<wsdl:portType name = "BPELProcess">
   <wsdl:operation name = "process">
      <wsdl:input message = "client:BPELProcessRequestMessage" />
      <wsdl:output message = "client:BPELProcessResponseMessage"/>
   </wsdl:operation>
</wsdl:portType>
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