[rabbitmq-discuss] Ruby Gem with Unicorn server

Mark static.void.dev at gmail.com
Wed Jan 18 01:03:07 GMT 2012

Do I need both statements?


AMQP::Integration::Rails.start do |connection|
    AMQP.channel = AMQP::Channel.new(connection)

On 1/17/12 10:10 AM, Michael Klishin wrote:
> Mark:
>> Is this all that is required?
> Yes. In 0.9.0 (possibly in 0.8.4 as well) there is a helper that reads config/amqp.yml similarly to config/database.yml:
>    require "amqp/utilities/event_loop_helper"
>    require "amqp/integration/rails"
>    # this helper detects what app server (if any) is being used and starts EventMachine reactor in a separate
>    # thread or just uses .next_tick (for example, with Thin).
>    AMQP::Utilities::EventLoopHelper.run
>    # reads config/amqp.yml, takes environment-specific key out of it (e.g. :development) and
>    # merges whatever you pass to .start with it.
>    AMQP::Integration::Rails.start do |connection|
>      puts "Connected to AMQP broker"
>      # this is just an accessor for 1 channel. It has no special properties, just a placeholder for
>      # applications that only need one channel
>      AMQP.channel    = AMQP::Channel.new(connection)
>    end
> I would like to try to make it detect Unicorn forking, that's why it is not not yet in the documentation: it may slightly change
> for 1.0. Your suggestions about what you want it to do are very welcome.
>> How come in the example we are connecting to a channel/queue in the after_fork hook? Is this for debugging purposes?
> Channels are typically opened when applications boot. Messages are published there just so that people can see messages flow.
> More on what role channels play: http://rubyamqp.info/articles/amqp_9_1_model_explained/#amqp_channels
> MK
> http://github.com/michaelklishin
> http://twitter.com/michaelklishin

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