Communication Paradigms - Connect

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What is a message queue? Message Queues An alternative paradigm for indirect communication based on distributed queues Messages are sent to a queue Processes can then access messages in the queue either by receiving a message (blocking), polling for messages (non-blocking) or being notified when messages arrive Messages are persistent and message delivery is reliable Fundamentally a point-to-point service (not multi-party) Uses in distributed systems Enterprise Application Integration (EAI), i.e. integration between applications in a given enterprise utilising the loose coupling Also used heavily in commercial transaction processing systems Examples include JMS, IBM’s Websphere MQ, Microsoft’s MSMQ and Oracle’s Streams Advanced Queuing AQ) Adv. Dist. Systems G. Blair/ F. Taiani 48
Message Queues (continued) Adv. Dist. Systems G. Blair/ F. Taiani 49
Page 1 and 2: Advanced Distributed Systems Commun
Page 3 and 4: A Framework for Understanding Distr
Page 5 and 6: The Problem: A Social Network Syste
Page 7 and 8: Interprocess Communication
Page 9 and 10: Other Approaches Message passing,
Page 11 and 12: Remote Invocation: Remote Procedure
Page 13 and 14: Styles of RPC First class RPC Int
Page 15 and 16: Interface Definition Languages Wha
Page 17 and 18: Remote Invocation: Remote Method In
Page 19 and 20: From RPC to Distributed Objects (Re
Page 21 and 22: Indirect Communication: General
Page 23 and 24: A Closer Look at Coupling Remote i
Page 25 and 26: Indirect Communication: Group Commu
Page 27 and 28: A Typical Group Service interface G
Page 29 and 30: Problems Reliability (against loss
Page 31 and 32: Implementing Reliable Multicast
Page 33 and 34: Ordering Guarantees Unordered mult
Page 35 and 36: Implementing Total Ordering The s
Page 37 and 38: Publish-Subscribe Systems What is
Page 39 and 40: A Closer Look at the Subscription
Page 41 and 42: Implementing Publish-Subscribe The
Page 43 and 44: Realising Content-based Approaches
Page 45 and 46: The Algorithm upon receive publish(
Page 47: Indirect Communication: Message Que
Page 51 and 52: Distributed Shared Memory What is
Page 53 and 54: Indirect Communication: Tuple Space
Page 55 and 56: Tuple Spaces(continued) Adv. Dist.
Page 57 and 58: Comparison of Approaches Adv. Dist.

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