File: //usr/share/doc/ruby-bunny/examples/guides/exchanges/headers_exchange_routing.rb
#!/usr/bin/env ruby
# encoding: utf-8
require "rubygems"
require "bunny"
puts "=> Headers exchange routing"
puts
conn = Bunny.new
conn.start
ch   = conn.create_channel
x    = ch.headers("headers")
q1   = ch.queue("", :exclusive => true).bind(x, :arguments => {"os" => "linux", "cores" => 8, "x-match" => "all"})
q2   = ch.queue("", :exclusive => true).bind(x, :arguments => {"os" => "osx",   "cores" => 4, "x-match" => "any"})
q1.subscribe do |delivery_info, properties, content|
  puts "#{q1.name} received #{content}"
end
q2.subscribe do |delivery_info, properties, content|
  puts "#{q2.name} received #{content}"
end
x.publish("8 cores/Linux", :headers => {"os" => "linux", "cores" => 8})
x.publish("8 cores/OS X",  :headers => {"os" => "osx",   "cores" => 8})
x.publish("4 cores/Linux", :headers => {"os" => "linux", "cores" => 4})
sleep 0.5
conn.close