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Advanced Messaging & Routing with AMQP

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Not all message queues are made equal. In the simplest case, a message queue is synonymous with an asynchronous protocol in which the sender and the receiver do not operate on the message at the same time. However, while this pattern is most commonly used to decouple distinct services (an intermediate mailbox, of sorts), the more advanced implementations also enable a host more advanced recipes: load balancing, queueing, failover, pubsub, etc. AMQP can do all of the above, and yesterday’s announcement ofВ RabbitMQ 1.7 (an open source AMQP broker) warrants a closer look.

Originally developed at JP Morgan as a vendor neutral wire and broker protocol, AMQP (Advanced Message Queuing Protocol) is, in fact, a general purpose messaging bus. The protocol itself is still under active development, but there are a variety of open source client and server implementations for it, as well as some big commercial supporters (RedHat, , etc). In other words, it works, it is production ready, and I can vouch for it from personal experience – we stream tens of millions of messages throughВ AMQP at PostRank on a daily basis.

AMQP vs XMPP: Features & Architecture

The AMQP vs XMPP debate has beenВ raging for years now. On the surface they both look identical, but in reality there are a number of important distinctions. For example, presence is one of the central components of XMPP, but it is not part of the AMQP specification. XMPP uses XML, whereas AMQP has a binary protocol. AMQP has native support for a number of delivery use cases (at least once, exactly once, select subscribers, persistence, etc) and also a variety ofВ exchange implementations which allow fine-grained control to where and how the messages are routed.

TheВ AMQP spec is a fast and recommended read, but by a way of quick introduction, the core architectural components are: publisher, exchange, queue, and consumer. As you may have guessed, the publisher is the data producer which pushes messages to an exchange. Why is it called an exchange? Because the exchange is a routing engine which is responsible for delivering the messages to the right queues (exchanges never store messages). For example, a message may need to be routed to just a single queue (direct exchange), maybe the message should be forwarded to every queue (pubsub) in the list (fanout exchange), or perhaps the message should be routed based on a key (topic exchange).



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