Description

IBM Message Queue::

It is most commonly used today in electronic mail. Without queuing, sending an electronic message over long distances requires every node on the route to be available for forwarding messages, and the addressees to be logged on In a queuing system, messages are stored at intermediate nodes until the system is ready to forward them. At their final destination they are stored in an electronic mailbox until the addressee is ready to read them.

Queuing is the mechanism by which messages are held until an application is ready to process them. Queuing allows  to:

• Communicate between programs (which might each be running in different environments) without having to write the communication code.
• Select the order in which a program processes messages.
• Balance loads on a system by arranging for more than one program to service a queue when the number of messages exceeds a threshold.
• Increase the availability of your applications by arranging for an alternative system to service the queues if your primary system is unavailable.

Main features of message queuing

The main features of applications that use message queuing techniques are:

• There are no direct connections between programs.
• Communication between programs can be time-independent.
• Work can be carried out by small, self-contained programs.
• Communication can be driven by events.
• Applications can assign a priority to a message.
• Security.
• Data integrity.
• Recovery support.

Benefits of using  message queuing to the application designer and developer

Some of the benefits of message queuing are:

• It  can design applications using small programs that you can share between many applications.
• It can quickly build new applications by reusing these building blocks.
• Applications written to use message queuing techniques are not affected by changes in the way that queue managers work.
•  Do not need to use any communication protocols. The queue manager deals with all aspects of communication for you.
• Programs that receive messages need not be running at the time that messages are sent to them. The messages are retained on queues.

What is a cluster?

A cluster is a network of queue managers that are logically associated in some way. Clustering is available to queue managers on all WebSphere MQ V6.0 platforms.

WebSphere MQ objects

The WebSphere MQ objects are:

• Queue managers
• Queue-sharing groups (WebSphere MQ for z/OS only), although these are not strictly objects.
• Queues
• Namelists
• Process definitions
• Authentication information objects
• Channels
• Storage classes (WebSphere MQ for z/OS only)
• Listeners
• Services (not WebSphere MQ for z/OS)

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