require 'rubygems' require 'mq' AMQPstart do in Java

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queue = MQqueue('long_live_queues', :durable => true) queuepop do |msg| puts msg if msg queuepop end end
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In our consumer we also set the :durable flag to true You might be wondering why our consumer must know whether the queue is persistent That is a great question The answer, according to the documentation, is that the first person to create a queue and set the :durable flag wins This means that all subsequent calls that attempt to set this flag are ignored Because of that, we don t know which might start the consumer or the publisher first, so we have to be careful and set the correct flags in both places I am not a big fan of this architecture, but that s the way it is, so we just have to accept it and work with it Now if we were to run our publisher, and then restart the RabbitMQ server, and then run our consumer code, we would expect to see the ten messages printed to the consumer s screen However, this does not happen Why Our messages did not get persisted because we did not tell the queue to persist them when we published them Confused That s okay; it s a little confusing at first We have declared that our queue is a persisted queue This means that we are allowed to put persistent messages into that queue It does not mean that all messages are persistent messages We need to declare that when we publish the message itself To tell the queue to persist a particular message, we need to pass the :persistent flag to the publish method Let s look at our publisher code again, this time with the :persistent flag set for our messages:
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require 'rubygems' require 'mq' AMQPstart do queue = MQqueue('long_live_queues', :durable => true) 10times do |i| puts i
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queuepublish("#{Timenow} - #{i}", :persistent => true) end puts "Finished publishing" end
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Now, if we were to run our publisher code, restart the RabbitMQ server, and then run our consumer code, we should see the following printed:
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Sun Sun Sun Sun Sun Sun Sun Sun Sun Sun May May May May May May May May May May 31 31 31 31 31 31 31 31 31 31 21:42:03 21:42:03 21:42:03 21:42:03 21:42:03 21:42:03 21:42:03 21:42:03 21:42:03 21:42:03 -0400 -0400 -0400 -0400 -0400 -0400 -0400 -0400 -0400 -0400 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 0 1 2 3 4 5 6 7 8 9
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I know it seems a little strange to first have to declare the queue as being persistent and then have to declare each message on that queue as persistent for it to work But that is how the system is architected It would be nice to have a flag that can be set on the queue to tell it to always persist every message it receives, but currently that functionality does not exist If you are struggling to figure out when you might use a mix of persisted and nonpersisted messages in a persisted queue, let me point you toward logging It is usually mission-critical to log error- and fatal-level messages However, debug messages could probably be lost on a server reboot, and most people wouldn t even notice So when we would publish our log messages, we would set the :persistent flag to true for error and fatal messages, and probably not set it for the other log levels
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In all our earlier examples, we used the pop method to retrieve messages from our queues Although this method is straightforward and easy to understand, it is not the most direct way of getting these messages I wanted you to understand the mechanics
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