Method: Bunny::Channel#basic_consume

Defined in:
lib/bunny/channel.rb

#basic_consume(queue, consumer_tag = generate_consumer_tag, no_ack = false, exclusive = false, arguments = nil, &block) ⇒ AMQ::Protocol::Basic::ConsumeOk Also known as: consume

Registers a consumer for queue. Delivered messages will be handled with the block provided to this method.

Parameters:

  • queue (String) —

    Queue to consume from

  • consumer_tag (String) (defaults to: generate_consumer_tag) —

    Consumer tag (unique identifier), generated by Bunny by default

  • no_ack (Boolean) (defaults to: false) —

    (false) If true, delivered messages will be automatically acknowledged. If false, manual acknowledgements will be necessary.

  • exclusive (Boolean) (defaults to: false) —

    (false) Should this consumer be exclusive?

  • arguments (Hash) (defaults to: nil) —

    (nil) Optional arguments that may be used by RabbitMQ extensions, etc

Returns:

  • (AMQ::Protocol::Basic::ConsumeOk) —

    RabbitMQ response

See Also:



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# File 'lib/bunny/channel.rb', line 964

def basic_consume(queue, consumer_tag = generate_consumer_tag, no_ack = false, exclusive = false, arguments = nil, &block)
  raise_if_no_longer_open!
  maybe_start_consumer_work_pool!

  queue_name = if queue.respond_to?(:name)
                 queue.name
               else
                 queue
               end

  # helps avoid race condition between basic.consume-ok and basic.deliver if there are messages
  # in the queue already. MK.
  if consumer_tag && consumer_tag.strip != AMQ::Protocol::EMPTY_STRING
    add_consumer(queue_name, consumer_tag, no_ack, exclusive, arguments || {}, &block)
  end

  @connection.send_frame(AMQ::Protocol::Basic::Consume.encode(@id,
      queue_name,
      consumer_tag,
      false,
      no_ack,
      exclusive,
      false,
      arguments))

  begin
    with_continuation_timeout do
      @last_basic_consume_ok = wait_on_continuations
    end
  rescue Exception => e
    # if basic.consume-ok never arrives, unregister the proactively
    # registered consumer. MK.
    unregister_consumer(@last_basic_consume_ok.consumer_tag)
    # #add_consumer records a consumer, make sure to undo it here. MK.
    delete_recorded_consumer(@last_basic_consume_ok.consumer_tag)

    raise e
  end

  # in case there is another exclusive consumer and we get a channel.close
  # response here. MK.
  raise_if_channel_close!(@last_basic_consume_ok)

  # covers server-generated consumer tags
  add_consumer(queue_name, @last_basic_consume_ok.consumer_tag, no_ack, exclusive, arguments || {}, &block)

  @last_basic_consume_ok
end