Designing and Programming CICS Applications

Chapter 14. Designing an Application to Use the MQSeries-CICS Bridge

In this chapter:

• Background to MQSeries

• The MQSeries-CICS Bridge

• Designing the Graphical User Interface

• Designing the Java Application

• Configuring MQSeries

• Running CICS DPL Programs

• Why Design It This Way?

• What’s Next…

The application described in this chapter is required for the head office to view a customer account. It makes use of the inquire function provided within the NACT02 program. The application needs to allow the user to input a customer account number and retrieve the account details. No modifications to the data will be made.

Background to MQSeries

Programs in the MQSeries application suite can be running on different computers, on different operating systems, and at different locations. The applications are written using a common programming interface known as the Message Queue Interface (MQI), so that applications developed on one platform can be ported to others.

Figure 14-1 shows two applications communicate using messages and queues; one application puts a message on a queue, and the other application gets that message from the queue.

Queue Managers

In MQSeries, queues are managed by a component called a queue manager. The queue manager provides messaging services for the applications and processes the MQI calls they issue. The queue manager ensures that messages are put on the correct queue or that they are routed to another queue manager.

Figure 14-1. MQSeries: Messaging using a single queue manager

Before ...