Class: MessageQueue::Rabbit

Inherits:
Base
  • Object
show all
Defined in:
lib/message_queue/rabbit.rb

Instance Attribute Summary

Attributes inherited from Base

#opts

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Rabbit

Returns a new instance of Rabbit.



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# File 'lib/message_queue/rabbit.rb', line 5

def initialize(opts={})
  @opts = opts
end

Instance Method Details

#client ⇒ Object 



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# File 'lib/message_queue/rabbit.rb', line 51

def client
  return @client if @client

  if @opts['cluster']
    @opts['cluster'].each_with_index do |server, i|
      host, port = server.split(':')
      begin
        @client = Carrot.new(
          :host   => host,
          :port   => port.to_i,
          :user   => @opts['user'],
          :pass   => @opts['pass'],
          :vhost  => @opts['vhost'],
          :insist => @opts['insist']
        )
        return @client
      rescue Carrot::AMQP::Server::ServerDown => e
        if i == (@opts['cluster'].size-1)
          raise e
        else
          Sweatshop.log "\n*** Sweatshop failing over to #{@opts['cluster'][i+1]} ***"
          Sweatshop.log "Error: #{e.message}\n#{e.backtrace.join("\n")}"
          next
        end
      end
    end
  else
    if @opts['host'] =~ /:/
      host, port = @opts['host'].split(':')
    else
      host = @opts['host']
      port = @opts['port']
    end
    @client = Carrot.new(
      :host   => host,
      :port   => port.to_i,
      :user   => @opts['user'],
      :pass   => @opts['pass'],
      :vhost  => @opts['vhost'],
      :insist => @opts['insist']
    )
  end
  @client
end

#client=(client) ⇒ Object 



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# File 'lib/message_queue/rabbit.rb', line 96

def client=(client)
  @client = client
end

#cmd(queue, command, *args) ⇒ Object 



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# File 'lib/message_queue/rabbit.rb', line 35

def cmd(queue, command, *args)
  retried = false
  begin
    client.queue(queue, :durable => true).send(command, *args)
  rescue Carrot::AMQP::Server::ServerDown => e
    if not retried
      Sweatshop.log "Error #{e.message}. Retrying..."
      @client = nil
      retried = true
      retry
    else
      raise e
    end
  end
end

#confirm(queue) ⇒ Object 



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# File 'lib/message_queue/rabbit.rb', line 27

def confirm(queue)
  cmd(queue, :ack)
end

#delete(queue) ⇒ Object 



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# File 'lib/message_queue/rabbit.rb', line 9

def delete(queue)
  cmd(queue, :delete)
end

#dequeue(queue) ⇒ Object 



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# File 'lib/message_queue/rabbit.rb', line 21

def dequeue(queue)
  task = cmd(queue, :pop, :ack => true)
  return unless task
  Marshal.load(task)
end

#enqueue(queue, data) ⇒ Object 



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# File 'lib/message_queue/rabbit.rb', line 17

def enqueue(queue, data)
  cmd(queue, :publish, Marshal.dump(data), :persistent => true)
end

#flush_all(queue) ⇒ Object 



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# File 'lib/message_queue/rabbit.rb', line 31

def flush_all(queue)
  cmd(queue, :purge)
end

#queue_size(queue) ⇒ Object 



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# File 'lib/message_queue/rabbit.rb', line 13

def queue_size(queue)
  cmd(queue, :message_count)
end

#stop ⇒ Object 



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# File 'lib/message_queue/rabbit.rb', line 100

def stop
  client.stop
end