require 'json'
require 'bunny'

class AMQPNotifierQueue
  def initialize(options = {})
    @amqp = Bunny.new(options)
    @amqp.start

    @exchange = @amqp.exchange('rails', :type => :topic)
    @hostname = `hostname -s`
    @pid = $$
  end

  # name, start, finish, result, instrumenter_id, payload
  def publish(*args)
    routing_key = [args[0], args[4], @pid, @hostname].join(".")
    @exchange.publish(args.to_json, :key => routing_key)
  end

  def subscribe(listener, pattern=nil, &block)
    @queue = @amqp.queue
    @queue.bind(@exchange, :key => pattern.to_s)
    Thread.new do
      @queue.subscribe { |msg| block.call(msg) }
    end
  end
end