Class: GorgonBunny::ReaderLoop

Inherits:
Object
  • Object
show all
Defined in:
lib/gorgon_bunny/lib/gorgon_bunny/reader_loop.rb

Overview

Network activity loop that reads and passes incoming AMQP 0.9.1 methods for processing. They are dispatched further down the line in GorgonBunny::Session and GorgonBunny::Channel. This loop uses a separate thread internally.

This mimics the way RabbitMQ Java is designed quite closely.

Instance Method Summary collapse

Constructor Details

#initialize(transport, session, session_thread) ⇒ ReaderLoop

Returns a new instance of ReaderLoop.



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# File 'lib/gorgon_bunny/lib/gorgon_bunny/reader_loop.rb', line 12

def initialize(transport, session, session_thread)
  @transport      = transport
  @session        = session
  @session_thread = session_thread
  @logger         = @session.logger
end

Instance Method Details

#join ⇒ Object 



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# File 'lib/gorgon_bunny/lib/gorgon_bunny/reader_loop.rb', line 97

def join
  @thread.join if @thread
end

#kill ⇒ Object 



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# File 'lib/gorgon_bunny/lib/gorgon_bunny/reader_loop.rb', line 101

def kill
  if @thread
    @thread.kill
    @thread.join
  end
end

#log_exception(e) ⇒ Object 



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# File 'lib/gorgon_bunny/lib/gorgon_bunny/reader_loop.rb', line 108

def log_exception(e)
  @logger.error "Exception in the reader loop: #{e.class.name}: #{e.message}"
  @logger.error "Backtrace: "
  e.backtrace.each do |line|
    @logger.error "\t#{line}"
  end
end

#raise(e) ⇒ Object 



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# File 'lib/gorgon_bunny/lib/gorgon_bunny/reader_loop.rb', line 93

def raise(e)
  @thread.raise(e) if @thread
end

#resume ⇒ Object 



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# File 'lib/gorgon_bunny/lib/gorgon_bunny/reader_loop.rb', line 24

def resume
  start
end

#run_loop ⇒ Object 



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# File 'lib/gorgon_bunny/lib/gorgon_bunny/reader_loop.rb', line 29

def run_loop
  loop do
    begin
      break if @stopping || @network_is_down
      run_once
    rescue Errno::EBADF => ebadf
      break if @stopping
      # ignored, happens when we loop after the transport has already been closed
    rescue GorgonAMQ::Protocol::EmptyResponseError, IOError, SystemCallError => e
      break if @stopping
      log_exception(e)

      @network_is_down = true

      if @session.automatically_recover?
        @session.handle_network_failure(e)
      else
        @session_thread.raise(GorgonBunny::NetworkFailure.new("detected a network failure: #{e.message}", e))
      end
    rescue ShutdownSignal => _
      break
    rescue Exception => e
      break if @stopping
      log_exception(e)

      @network_is_down = true
      @session_thread.raise(GorgonBunny::NetworkFailure.new("caught an unexpected exception in the network loop: #{e.message}", e))
    end
  end

  @stopped = true
end

#run_once ⇒ Object 



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# File 'lib/gorgon_bunny/lib/gorgon_bunny/reader_loop.rb', line 62

def run_once
  frame = @transport.read_next_frame
  return if frame.is_a?(GorgonAMQ::Protocol::HeartbeatFrame)

  if !frame.final? || frame.method_class.has_content?
    header   = @transport.read_next_frame
    content  = ''

    if header.body_size > 0
      loop do
        body_frame = @transport.read_next_frame
        content << body_frame.decode_payload

        break if content.bytesize >= header.body_size
      end
    end

    @session.handle_frameset(frame.channel, [frame.decode_payload, header.decode_payload, content])
  else
    @session.handle_frame(frame.channel, frame.decode_payload)
  end
end

#start ⇒ Object 



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# File 'lib/gorgon_bunny/lib/gorgon_bunny/reader_loop.rb', line 20

def start
  @thread    = Thread.new(&method(:run_loop))
end

#stop ⇒ Object 



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# File 'lib/gorgon_bunny/lib/gorgon_bunny/reader_loop.rb', line 85

def stop
  @stopping = true
end

#stopped? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/gorgon_bunny/lib/gorgon_bunny/reader_loop.rb', line 89

def stopped?
  @stopped
end