AMQP/RabbitMQ in Java

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8 AMQP/RabbitMQ
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That wasn t so bad, was it Compared to some of the other hoops we have had to jump through in this book to get distributed loggers to work, that was relatively easy and straightforward One note, though Earlier in this chapter I made a great deal of fuss about how great the AMQP gem is documented, and that certainly is true with the exception of the MQ::Logger class It s a simple class, and its usage is pretty straightforward, but it would be nice to see some documentation around this class Hopefully, Aman will document it soon
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Shortly before this book was published, a new library emerged called Quison According to its author, Dan DeLeo, Quison lives to make AMQP work with your web server, and make it easy What does that statement actually mean Well, according to Dan it means that a set of monkey patches set up the required callbacks and/or worker threads so that AMQP will work correctly with Passenger, Mongrel, and Thin Quison apparently also creates a pool of connections to the AMQP server to increase performance Although this library looks promising, it is still very green and probably needs more extensive testing before it s ready for prime-time production use It is also possible that by the time you read these lines this library is either widely used or perhaps even rolled into the AMQP library (the latter being my hope) Either way, it is nice to see a thriving community growing around the AMQP specification
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Persisted AMQP Queues
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When creating and using a queue, it is important to decide whether that queue needs to be persisted If the RabbitMQ server is terminated or restarted, how important to
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you is it that the messages are delivered when that server comes back online For example, it might not be that important to persist debugging messages, but it might be very important to persist new stock purchase requests that come in So with that in mind, let s briefly talk about how we can make our AMQP queues, and messages, persistent First, I would like to point out that according to the documentation, persistent queues are slower than nonpersistent queues This makes sense if you think about how a nonpersistent queue retains messages in memory, whereas a persistent queue has to write and read messages from disk This is important to keep in mind when designing your queue With those few architectural concerns out of the way, let s look at our publisher for this example:
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require 'rubygems' require 'mq' AMQPstart do queue = MQqueue('long_live_queues') 10times do |i| queuepublish("#{Timenow} - #{i}") end puts "Finished publishing" end
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This example is straightforward We access the long_live_queues queue and write to it ten messages, each with the current time and a number Now, let s run the publisher code After we see the Finished publishing message, let s stop and restart our RabbitMQ server After the RabbitMQ server has restarted, let s run the following consumer:
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require 'rubygems' require 'mq' AMQPstart do queue = MQqueue('long_live_queues')
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queuepop do |msg| puts msg if msg queuepop end end
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8 AMQP/RabbitMQ
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The consumer code runs, but we did not receive any messages to process It just continues to loop without printing anything Why is that Well, to start with, we need to make the queue it set a persistent queue By default all queues are nonpersistent This is because of the performance concerns mentioned earlier To make a queue persistent, we simply have to pass it the :durable option the first time we create the queue Let s see what our publisher would look like when we add this flag:
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require 'rubygems' require 'mq' AMQPstart do queue = MQqueue('long_live_queues', :durable => true) 10times do |i| puts i queuepublish("#{Timenow} - #{i}") end puts "Finished publishing" end
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When we call the queue method to retrieve the queue, we set the :durable flag to true By default, this setting is false So now we should have a persistent queue, right Not quite First we need to make a change to our consumer:
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