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


Dynamic invocation with wired Web Service import, using SMO

How to enable dynamic invocation of an endpoint with a wired Web Service data binding import, using SMO.

Introduction

You can invoke services by using endpoints that are different to those specified in the import. For Web Service bindings, a dynamic endpoint can be specified using a URL that conforms to the web services URI standard.
Figure 1. Illustration of endpoint override by dynamic invocation using SMO, with wired 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 Web Service endpoint

To create a mediation module that includes the dynamic endpoint, perform the following tasks:
  1. Create Mediation Module 1, containing an Export, a mediation flow component, and a Web Service 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 callout node has dynamic endpoint invocation override enabled.
  6. Deploy the modules to the server.

Using dynamic invocation

Dynamic invocation takes place when the export is invoked with a message containing routing criteria that resolve to SvcProvider 2. The mediation flow component identifies the routing criteria in the message. The mediation flow component uses the Message Element Setter primitive to set the new target address in the SMO, using the incoming message content and routing criteria. Alternatively, the mediation flow component might use the Business Object Map or XSL Transformation primitives to set the new target address. 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 one of three conditions is true:
  • The endpoint specified does not exist.
  • The URL format and the import binding type are not compatible.
  • The URI has invalid syntax.
The exception is thrown by the import, and returned in the response flow.

reference Reference topic

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Timestamp icon Last updated: 21 June 2010


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