WebSphere Enterprise Service Bus, Version 6.2.0 Operating Systems: AIX, HP-UX, i5/OS, Linux, Solaris, Windows


Dynamic invocation with unwired SCA import, using SMO

How to enable dynamic invocation of an endpoint with an unwired SCA import, using SMO.

Introduction

You can invoke services by using endpoints that are different to those specified in the import.
Figure 1. Illustration of endpoint override by dynamic invocation using SMO, with unwired import
A message flows through a module and through the import binding to a Web service. Information in the message can override the endpoint dynamically.

You create a mediation module that includes the dynamic endpoint, by performing tasks in WebSphere® Integration Developer.

Creating a dynamic invocation with a SCA endpoint

To create a mediation module that includes the dynamic endpoint, perform the following tasks:
  1. Create the Mediation Module, containing an Export, a mediation flow component, and an unwired SCA Import. The export is of any type.
  2. Connect the Mediation Module import to static SvcProvider 1.
  3. Create SvcProvider 2.
  4. Check that SvcProvider 1 and SvcProvider 2 have the same port type.
  5. Check that the Import is configured to route messages to SvcProvider 1.
  6. Check that the callout node has dynamic endpoint invocation override enabled.
  7. Deploy the modules to the server.

Using dynamic invocation

Dynamic invocation takes place when the export is invoked with a message containing a target import, routing criteria that resolve to SvcProvider 2, and a target import. The mediation flow component extracts the endpoint and the target import from the message, and puts them into the SMO, using the Message Element Setter primitive. The callout uses information from the SMO to invoke SvcProvider 2. Any response is returned by the response flow to the caller of export.

The callout uses information from the SMO to invoke SvcProvider 2. Any response is returned by the response flow to the caller of export.

A one-way invocation message works the same way as a two-way message, except that no response message is returned.

A runtime exception occurs when any one of three conditions is true:
  • The URI has invalid syntax.
  • The target import specified does not exist.
  • SvcProvider 2 is not available.
A runtime exception thrown by the import is returned in the response flow.

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Timestamp icon Last updated: 21 June 2010


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