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Hello World the AMQP Way
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You might be wondering where your queue comes from when you call the queue method You didn t create a queue through any configuration, but the queue method returns a valid queue for you anyway The answer is simple When you access a queue, if it doesn t already exist, it is created This allows you to write simple code that requires less error handling More important, it lets you get on with designing and building your application without having to worry about creating new configuration files, installing and running those files, and so on Beware, though this does have a drawback Should you mistype the name of the queue, you then will either be trying to place messages into the wrong queue, or you ll pull them out of the wrong queue If you are placing messages into a queue named my_queue and you are trying to pull them out of a queue named myqueue, you will not receive any errors, and debugging can be time consuming and difficult If you are having some issues, make sure to check this first it could very well be a simple typo causing your problems One solution for this might be creating a wrapper class around your queue and using that to access it, like such:
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class HelloWorldQueue < MQ::Queue class << self def queue(options = {}) MQqueue('hello_world', opts) end end end
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8 AMQP/RabbitMQ
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queue = HelloWorldQueuequeue queuepublish('Hello, World!') queuepop do |msg| puts "#{Timenow}: #{msg}" if msg queuepop end
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Another solution would be to use a configuration tool to define the names of your queues, and then use that whenever you try to access a queue When we have the queue, we can call the publish method on it, passing it our message that we want our consumer to retrieve Now, let s look at that consumer to see what we are dealing with:
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require 'rubygems' require 'mq' AMQPstart do queue = MQqueue('hello_world_queue') queuepop do |msg| puts "#{Timenow}: #{msg}" if msg queuepop end end
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Like our publisher, we need to call the start method on the AMQP module to connect to our server Then we can call the pop method on the queue to retrieve the next message in the queue We pass the pop method a block that we want to execute In our case we say that as long as the message we receive is not nil, print that message to the screen Once we have done that, we call the pop method again We call the pop method again to create an infinite loop that is continually pulling messages off the queue We do not need to pass it a block again, because it retains the block information from the first time we called it
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Hello World the AMQP Way
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Running this code should produce something similar to the following:
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Sun May 24 23:03:39 -0400 2009: Hello, World!
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Why Does the Publisher Code Never Exit
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If you are observant, you probably noticed that both the consumer and publisher code, when executed, seem to run in an infinite loop and never exit This seems to be the correct behavior for the consumer, because we want it to run forever and constantly look for new messages But why is the publisher doing the same thing The publisher code does not need to hang; we just coded it that way but for a very good reason When we call the start method on AMQP and pass it a block, that block is run inside a Thread that never exits We could easily have rewritten our publisher code to look like this:
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require 'rubygems' require 'mq' Threadnew { AMQPstart } queue = MQqueue('hello_world_queue') queuepublish('Hello, World!')
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When we call the start method without the block, it does not create a Thread for us Instead, it binds to the Thread that starts it To get the real benefits of AMQP, it needs to be run in a separate Thread, so we have wrapped it in a new Thread In fact, this is also how we would have rewritten the code had it been in a larger application, such as a web application, that we know will run forever
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