Class: Sneakers::Queue

Inherits:
Object
  • Object
show all
Defined in:
lib/sneakers/queue.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, opts) ⇒ Queue

Returns a new instance of Queue.



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# File 'lib/sneakers/queue.rb', line 5

def initialize(name, opts)
  @name = name
  @opts = opts
  @handler_klass = Sneakers::CONFIG[:handler]
end

Instance Attribute Details

#channel ⇒ Object (readonly)

Returns the value of attribute channel.



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# File 'lib/sneakers/queue.rb', line 3

def channel
  @channel
end

#exchange ⇒ Object (readonly)

Returns the value of attribute exchange.



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# File 'lib/sneakers/queue.rb', line 3

def exchange
  @exchange
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/sneakers/queue.rb', line 3

def name
  @name
end

#opts ⇒ Object (readonly)

Returns the value of attribute opts.



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# File 'lib/sneakers/queue.rb', line 3

def opts
  @opts
end

Instance Method Details

#subscribe(worker) ⇒ Object

:exchange :heartbeat_interval :prefetch :durable :ack



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# File 'lib/sneakers/queue.rb', line 18

def subscribe(worker)
  # If we've already got a bunny object, use it.  This allows people to
  # specify all kinds of options we don't need to know about (e.g. for ssl).
  @bunny = @opts[:connection]
  @bunny ||= create_bunny_connection
  @bunny.start

  @channel = @bunny.create_channel
  @channel.prefetch(@opts[:prefetch])

  exchange_name = @opts[:exchange]
  @exchange = @channel.exchange(exchange_name, **@opts[:exchange_options])

  routing_key = @opts[:routing_key] || @name
  routing_keys = [*routing_key]

  handler_klass = worker.opts[:handler] || Sneakers::CONFIG.fetch(:handler)
  # Configure options if needed
  if handler_klass.respond_to?(:configure_queue)
    @opts[:queue_options] = handler_klass.configure_queue(@name, @opts)
  end

  queue = @channel.queue(@name, **@opts[:queue_options])

  should_bind = @opts.fetch(:bind, true)
  if should_bind && exchange_name.length > 0
    routing_keys.each do |key|
      if @opts[:bind_arguments]
        queue.bind(@exchange, routing_key: key, arguments: @opts[:bind_arguments])
      else
        queue.bind(@exchange, routing_key: key)
      end
    end
  end

  # NOTE: we are using the worker's options. This is necessary so the handler
  # has the same configuration as the worker. Also pass along the exchange and
  # queue in case the handler requires access to them (for things like binding
  # retry queues, etc).
  handler = handler_klass.new(@channel, queue, worker.opts)

  @consumer = queue.subscribe(block: false, manual_ack: @opts[:ack]) do | delivery_info, metadata, msg |
    worker.do_work(delivery_info, metadata, msg, handler)
  end
  nil
end

#unsubscribe ⇒ Object 



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# File 'lib/sneakers/queue.rb', line 65

def unsubscribe
  return unless @consumer

  # TODO: should we simply close the channel here?
  Sneakers.logger.info("Queue: will try to cancel consumer #{@consumer.inspect}")
  cancel_ok = @consumer.cancel
  if cancel_ok
    Sneakers.logger.info "Queue: consumer #{cancel_ok.consumer_tag} cancelled"
    @consumer = nil
  else
    Sneakers.logger.warn "Queue: could not cancel consumer #{@consumer.inspect}"
    sleep(1)
    unsubscribe
  end
end