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$ sudo rabbitmqctl stop_app
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When I first tried to run this command, I got the following error:
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Stopping node rabbit@macbates Error: {badrpc,nodedown}
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It turns out I was not running the server as the proper user I had been running the server with the following command:
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$ sudo rabbitmq-server
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It should have been the following:
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$ sudo -H -u rabbitmq rabbitmq-server
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The -u option allows the RabbitMQ server to run as the rabbitmq user which is, apparently, what the rabbitmqctl script is expecting it to be run as
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Documentation
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One thing I always lack in the Ruby community is good documentation In part, that fact inspired this book The lack of good documentation surrounding DRb and Rinda led to the birth of this book In general, I have found that, despite the relatively easy methods of documenting Ruby
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Hello World the AMQP Way
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code, RDoc, and RI, few people take the time to adequately document their code Instead, they opt for the It s self-documenting fallback When I opened the AMQP gem, I expected to find more of the same I am here to tell you that Aman Gupta, the lead developer of the gem, has done a great job of documenting it I wish all libraries were this well documented It would make everyone s lives easier if we had a good evolving set of documentation that traveled with the code we were using Although I go into some detail about the AMQP gem, what it has to offer, and some of the ways you can use it in your code, there is no substitute for the real thing Please take a few minutes, open the RDoc for the gem, and give it a good read The many options and ways to configure this gem can seriously impact your architecture decisions, and you need to understand them When you are done reading the RDoc, drop Aman a line via his GitHub page at http://githubcom/tmm1/amqp, and tell him you appreciate his taking the time to write such great documentation You will know if your server is running when you try to run your code and you see an error message similar to this:
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AMQP::Error: Could not connect to server 127001:5672
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With our RabbitMQ server now running, we can commence with our routine first exercise of saying, Hello, World! Let s start by publishing our Hello, World! message:
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require 'rubygems' require 'mq'
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AMQPstart do queue = MQqueue('hello_world_queue') queuepublish('Hello, World!') end
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8 AMQP/RabbitMQ
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Unlike most RubyGems, the AMQP gem breaks with the convention of using the name of the gem as the file you need to use the gem It is for this reason that we require the file mq and not amqp Although I applaud Aman on a lot of how the AMQP gem is written, this is certainly not one of them I am a firm believer in using the gem name as the name of the required file, and not another file After obtaining the proper files, we can start using the AMQP gem To get started we call the start method on the AMQP module This method makes our connection for us Because of that, the start method takes an optional Hash of options to allow for configuration The options are as follows, along with their respective defaults:
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{ # Server Address: :host => '127001', :port => 5672, # Login: :user => 'guest', :pass => 'guest', :vhost => '/', # Connection Timeout: :timeout => nil, # Logging: :logging => false }
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The other argument we need to pass to the start method is a block representing the code we want to run in the context of the AMQP server we just connected to In this block we need to gain access to the queue we are looking for The easiest way is to use the queue method of the MQ class, as we have done in our example
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