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Comprehensive Guide to Message-Oriented Middleware Systems

Explore messaging patterns, channels, queuing, and advantages of Message-Oriented Middleware (MOM) with a focus on AMQP, RabbitMQ, and more. Learn about strengths, weaknesses, and examples from RabbitMQ.

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Comprehensive Guide to Message-Oriented Middleware Systems

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Presentation Transcript

  1. Messaging

  2. Message Type Patterns • Command • Invoke a procedure in another application • SOAP request is an example • Document Message • Single unit of information, single object or data structure • SOAP response is an example • Event • Asynchronous event notification between applications • Do not require a reply • Request-reply • Two-way communication • Can be P2P or pubsub • How should it be broadcasted? 1, 2, …, many?

  3. Message Channel Patterns • Channels = queues • Point-to-point Channel • Take out the middle man • Pub-sub Channel • Sends event to all subscribed users • Datatype Channel • Different data types have their own channels • Allows applications to handle events differently based on object

  4. Message Queuing • One of the most widely used method for distributed apps • Allows distributed applications to communicate asynchronously • Messages sent are stored in queue to be delivered to recipient • Allows abstraction • Distributed applications can be developed without the need to worry about the mode of transportation • Don’t care about the availability of end recipient

  5. Message Queuing Advantages • No direct communication between programs (clients) • Loose coupling • Communication is independent of time • Communication can be driven by events • Work is carried out by small self-contained programs • Can assign priority to a message • Security • Authorization checks (like access control list) • Data Integrity • Recovery Support

  6. Message Oriented Middleware (MOM) • AMQP (Advanced Message Queuing Protocol) • Apache Qpid • RabbitMQ • StormMQ • XMPP (Extensible Messaging and Presence Protocol) • ejabberd (Erlang Jabber Daemon) • Metronome • STOMP (Streaming Text Oriented Messaging Protocol) • Apache ActiveMQ • Apache Apollo • RabbitMQ • Others • Apache Kafka

  7. Example from RabbitMQ

  8. Example from RabbitMQ

  9. CMAPI with Message Broker

  10. Evaluation • Strengths • Provides increased modularity: middleware is swappable • Can use pub/sub in browser and pub/sub across browsers • Asynchronous communication model for speed • Leverage distributed resources for efficiency and redundancy • Weaknesses • Distributed, asynchronous nature could lead to difficult debugging • Complicated to program (if you start from scratch…) • No real strong standards….

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