Communication Paradigms - Connect
Communication Paradigms - Connect
Communication Paradigms - Connect
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What is a message queue?<br />
Message Queues<br />
An alternative paradigm for indirect communication based on<br />
distributed queues<br />
Messages are sent to a queue<br />
Processes can then access messages in the queue either by<br />
receiving a message (blocking), polling for messages (non-blocking)<br />
or being notified when messages arrive<br />
Messages are persistent and message delivery is reliable<br />
Fundamentally a point-to-point service (not multi-party)<br />
Uses in distributed systems<br />
Enterprise Application Integration (EAI), i.e. integration between<br />
applications in a given enterprise utilising the loose coupling<br />
Also used heavily in commercial transaction processing systems<br />
Examples include JMS, IBM’s Websphere MQ, Microsoft’s MSMQ<br />
and Oracle’s Streams Advanced Queuing AQ)<br />
Adv. Dist. Systems G. Blair/ F. Taiani 48
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