Introduction to the new mainframe © Copyright IBM Corp., 2005. All rights reserved. Chapter 15 WebSphere MQ.

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Presentation transcript:

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Chapter 15 WebSphere MQ

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Chapter 15 objectives Be able to: Explain why messaging and queuing is used Describe the asynchronous flow of messages Explain the function of a queue manager List three zSeries-related adapters

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Key terms in this chapter local queue channel message-driven MQI asynchronous application dead-letter queue QM remote queue syncpoint

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Synchronous communication model

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Asynchronous communication model

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Styles of Communication

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Messages Types of messages: Datagram Request Reply Report

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Queue Manager

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Message Queue Interface (MQI)

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Message layout

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Queue types

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Channels

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Security

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Data Integrity

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Travel agency example revisited

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Interfacing to WebSphere MQ MQ is available on many platforms On z/OS it has interfacing to: CICS IMS Batch or TSO

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. MQ functions Common application programming interface (MQI) Assured delivery: messages do not get lost and they arrive only once No synchronous access needed Message driven application Quicker development due to shielding of the network

Introduction to the new mainframe © Copyright IBM Corp., All rights reserved. Summary Messaging and queuing enables communication between applications on different platforms. WebSphere MQ is an example of software that manages messaging and queuing in the mainframe and other environments. With messaging, programs communicate by through messages, rather than by calling each other directly. With queuing, messages are retained on queues in storage, so that programs can run independently of each other (asynchronously).