Class: MQ

Inherits:
Object
  • Object
show all
Includes:
AMQP, EM::Deferrable
Defined in:
lib/mq.rb,
lib/mq.rb,
lib/mq.rb,
lib/mq.rb,
lib/mq/rpc.rb,
lib/mq/queue.rb,
lib/mq/exchange.rb

Overview

unique identifier

Defined Under Namespace

Classes: Error, Exchange, Queue, RPC

Constant Summary

Constants included from AMQP

AMQP::DIR, AMQP::FIELDS, AMQP::HEADER, AMQP::PORT, AMQP::RESPONSES, AMQP::VERSION, AMQP::VERSION_MAJOR, AMQP::VERSION_MINOR

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from AMQP

client, client=, connect, settings, start, stop

Constructor Details

#initialize(connection = nil) ⇒ MQ

Returns a new instance of MQ.



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# File 'lib/mq.rb', line 21

def initialize connection = nil
  raise 'MQ can only be used from within EM.run{}' unless EM.reactor_running?

  @connection = connection || AMQP.start

  conn.callback{ |c|
    @channel = c.add_channel(self)
    send Protocol::Channel::Open.new
  }
end

Class Attribute Details

.logging ⇒ Object

Returns the value of attribute logging.



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# File 'lib/mq.rb', line 11

def logging
  @logging
end

Instance Attribute Details

#channel ⇒ Object (readonly)

Returns the value of attribute channel.



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# File 'lib/mq.rb', line 31

def channel
  @channel
end

Class Method Details

.default ⇒ Object 



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# File 'lib/mq.rb', line 151

def MQ.default
  Thread.current[:mq] ||= MQ.new
end

.id ⇒ Object 



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# File 'lib/mq.rb', line 162

def MQ.id
  Thread.current[:mq_id] ||= "#{`hostname`.strip}-#{Process.pid}-#{Thread.current.object_id}"
end

.method_missing(meth, *args, &blk) ⇒ Object 



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# File 'lib/mq.rb', line 155

def MQ.method_missing meth, *args, &blk
  MQ.default.__send__(meth, *args, &blk)
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/mq.rb', line 111

def close
  if @deferred_status == :succeeded
    send Protocol::Channel::Close.new(:reply_code => 200,
                                      :reply_text => 'bye',
                                      :method_id => 0,
                                      :class_id => 0)
  else
    @closing = true
  end
end

#exchanges ⇒ Object

keep track of proxy objects



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# File 'lib/mq.rb', line 124

def exchanges
  @exchanges ||= {}
end

#process_frame(frame) ⇒ Object 



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# File 'lib/mq.rb', line 33

def process_frame frame
  log :received, frame

  case frame
  when Frame::Header
    @header = frame.payload
    @body = ''

  when Frame::Body
    @body << frame.payload
    if @body.length >= @header.size
      @header.properties.update(@method.arguments)
      @consumer.receive @header, @body
      @body = ''
    end

  when Frame::Method
    case method = frame.payload
    when Protocol::Channel::OpenOk
      send Protocol::Access::Request.new(:realm => '/data',
                                         :read => true,
                                         :write => true,
                                         :active => true)

    when Protocol::Access::RequestOk
      @ticket = method.ticket
      callback{
        send Protocol::Channel::Close.new(:reply_code => 200,
                                          :reply_text => 'bye',
                                          :method_id => 0,
                                          :class_id => 0)
      } if @closing
      succeed

    when Protocol::Basic::Deliver
      @method = method
      @header = nil
      @body = ''
      @consumer = queues[ method.consumer_tag ]


    when Protocol::Channel::Close
      raise Error, "#{method.reply_text} in #{Protocol.classes[method.class_id].methods[method.method_id]}"

    when Protocol::Channel::CloseOk
      @closing = false
      conn.callback{ |c|
        c.channels.delete(@channel)
        c.close unless c.channels.keys.any?
      }
    end
  end
end

#queue(name, opts = {}) ⇒ Object 



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# File 'lib/mq.rb', line 103

def queue name, opts = {}
  queues[name] ||= Queue.new(self, name, opts)
end

#queues ⇒ Object 



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# File 'lib/mq.rb', line 128

def queues
  @queues ||= {}
end

#rpc(name, obj = nil) ⇒ Object 



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# File 'lib/mq.rb', line 107

def rpc name, obj = nil
  rpcs[name] ||= RPC.new(self, name, obj)
end

#rpcs ⇒ Object 



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# File 'lib/mq.rb', line 132

def rpcs
  @rcps ||= {}
end

#send(data) ⇒ Object 



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# File 'lib/mq.rb', line 87

def send data
  data.ticket = @ticket if @ticket and data.respond_to? :ticket
  conn.callback{ |c|
    log :sending, data
    c.send data, :channel => @channel
  }
end