Introduction to z/OS Basics © 2006 IBM Corporation Chapter 15: WebSphere MQ.

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Presentation transcript:

Introduction to z/OS Basics © 2006 IBM Corporation Chapter 15: WebSphere MQ

Chapter 15 WebSphere MQ © 2006 IBM Corporation 2 Chapter 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

Chapter 15 WebSphere MQ © 2006 IBM Corporation 3 Key terms in this chapter  local queue  channel  message-driven  MQI  asynchronous application  dead-letter queue  QM  remote queue  syncpoint

Chapter 15 WebSphere MQ © 2006 IBM Corporation 4 Synchronous communication model

Chapter 15 WebSphere MQ © 2006 IBM Corporation 5 Asynchronous communication model

Chapter 15 WebSphere MQ © 2006 IBM Corporation 6 Styles of Communication

Chapter 15 WebSphere MQ © 2006 IBM Corporation 7 Messages  Types of messages: –Datagram –Request –Reply –Report

Chapter 15 WebSphere MQ © 2006 IBM Corporation 8 Queue Manager

Chapter 15 WebSphere MQ © 2006 IBM Corporation 9 Message Queue Interface (MQI)

Chapter 15 WebSphere MQ © 2006 IBM Corporation 10 Message layout

Chapter 15 WebSphere MQ © 2006 IBM Corporation 11 Queue types

Chapter 15 WebSphere MQ © 2006 IBM Corporation 12 Channels

Chapter 15 WebSphere MQ © 2006 IBM Corporation 13 Security

Chapter 15 WebSphere MQ © 2006 IBM Corporation 14 Data Integrity

Chapter 15 WebSphere MQ © 2006 IBM Corporation 15 Travel agency example revisited

Chapter 15 WebSphere MQ © 2006 IBM Corporation 16 Interfacing to WebSphere MQ  MQ is available on many platforms  On z/OS it has interfacing to: –CICS –IMS –Batch or TSO

Chapter 15 WebSphere MQ © 2006 IBM Corporation 17 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

Chapter 15 WebSphere MQ © 2006 IBM Corporation 18 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).