Writing a routing mediation

Use this topic to create a mediation that chooses a particular forward route for a message.

1. Create an empty mediation handler project.
   This creates the project, and creates the handler class that implements the handler interface. For detailed instructions on how to do this, see Writing the mediation handler.
2. Use the mediation pane on the EJB descriptor to define the handler class as a mediation handler.
   Note: When you do this, you specify a name by which the mediation handler list is known. Make a note of this name, for later reference when you create the mediation in the bus.
3. Add the routing function to the handler.
   Before you begin, review Adding mediation function to handler code, in particular its subtopic Working with message context. Add import statements to your handler class, and modify the handle method by adding your routing code. Specify the routing destination by adding that destination to the front of the forward routing path list. The forward routing path list is available from the message context. For example:

   import javax.xml.rpc.handler.MessageContext;
   import com.ibm.websphere.sib.mediation.handler.MediationHandler;
   import com.ibm.websphere.sib.mediation.handler.MessageContextException;
   import com.ibm.websphere.sib.mediation.messagecontext.SIMessageContext;
   import com.ibm.websphere.sib.SIMessage;
   import com.ibm.websphere.sib.SIDestinationAddress;
   import com.ibm.websphere.sib.SIDestinationAddressFactory;
   import java.util.List;
   public class RouteMediationHandler implements MediationHandler {
   
   	public boolean handle(MessageContext ctx) throws MessageContextException {
   		SIMessageContext siCtx = (SIMessageContext) ctx;
   		SIMessage msg = siCtx.getSIMessage();
   		List frp = msg.getForwardRoutingPath();
   		try {
   			SIDestinationAddress destination =
   				SIDestinationAddressFactory
   					.getInstance()
   					.createSIDestinationAddress(
   					"RoutingDestination", //this is the name of the target destination
   					false);
   			frp.add(0, destination);
   		} catch (Exception e) {
   			return false;
   		}
   		msg.setForwardRoutingPath(frp);
   		return true;
   	}
   
   }
   

   For more information about the service integration technologies classes, including the mediation handler and message context classes, see the Generated API documentation - Application programming interfaces.
4. Export the routing mediation enterprise application.