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How does distributed queuing work?

 

Figure 1 shows an overview of the components of distributed queuing.

Figure 1. Overview of the components of distributed queuing

1. An application uses the MQCONN call to connect to a queue manager.

2. The application then uses the MQOPEN call to open a queue so that it can put messages on it.

3. A queue manager has a definition for each of its queues, specifying information such as the maximum number of messages allowed on the queue.

4. If the messages are destined for a queue on a remote system, the local queue manager holds them in a message store until it is ready to forward them to the remote queue manager. This can be transparent to the application.

5. Each queue manager contains communications software called the moving service component; through this, the queue manager can communicate with other queue managers.

6. The transport service is independent of the queue manager and can be any one of the following (depending on the platform):

   • Systems Network Architecture Advanced Program-to Program Communication (SNA APPC)

   • Transmission Control Protocol/Internet Protocol (TCP/IP)

   • Network Basic Input/Output System (NetBIOS)

   • Sequenced Packet Exchange (SPX)

• What do we call the components?
  

• Components needed to send a message
  

• Components needed to return a message
  

• Cluster components
  

 

Parent topic:

What is intercommunication?

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