Route messages to different message queues in IBM MQ based on MQRFH2 and USR properties

Question

Would appreciate if anyone is able to assist/provide some sort of a guide/tutorial for using IBM IIB (Integrated Toolkit) and IBM MQ, making use of MQ Input Node, Compute Node and MQ Output Node, such that when a message is put on the input queue, it will be routed to an output queue based on the MQRFH2 headers and USR properties set/defined in the compute node (ESQL file)

E.g. If MQRFH2/USR = 1, route message to Queue 1, IF MQRFH2/USR = 2, route message to Queue 2, etc.

Thanks in advance.

Answer 1

Please read Accessing the MQRFH2 header and Populating Destination in the local environment tree.

Then you could write your ESQL like this: (assuming the RFH2 routing variable is named Ker)

CREATE COMPUTE MODULE Routing_Compute
    CREATE FUNCTION Main() RETURNS BOOLEAN
    BEGIN
        SET OutputLocalEnvironment.Destination.MQ.DestinationData[1].queueName =
            CASE InputRoot.MQRFH2.usr.Ker
                WHEN '1' THEN 'Q1'
                WHEN '2' THEN 'Q2'
                ELSE 'Q3'
            END;
        RETURN TRUE;
    END;
END MODULE;

Remember to change the default node configuration like this:

• Compute: Set Compute mode to LocalEnvironment
• MQ Ouput: Set Destination mode to Destination List

Example: If input message header Ker has value 2, then it will be routed to queue Q2.