Class: MarchHare::BlockingCallbackConsumer

Inherits:
CallbackConsumer show all
Defined in:
lib/march_hare/consumers/blocking.rb

Constant Summary collapse

POISON = 
:__poison__

Instance Attribute Summary

Attributes inherited from BaseConsumer

#auto_ack, #consumer_tag

Instance Method Summary collapse

Methods inherited from BaseConsumer

#active?, #cancelled?, #handleCancel, #handleCancelOk, #handleDelivery, #recover_from_network_failure, #terminated?

Constructor Details

#initialize(channel, queue, buffer_size, opts, callback) ⇒ BlockingCallbackConsumer

Returns a new instance of BlockingCallbackConsumer.



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# File 'lib/march_hare/consumers/blocking.rb', line 7

def initialize(channel, queue, buffer_size, opts, callback)
  super(channel, queue, opts, callback)
  if buffer_size
    @internal_queue = JavaConcurrent::ArrayBlockingQueue.new(buffer_size)
  else
    @internal_queue = JavaConcurrent::LinkedBlockingQueue.new
  end
end

Instance Method Details

#cancel ⇒ Object 



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# File 'lib/march_hare/consumers/blocking.rb', line 16

def cancel
  if super
    @internal_queue.offer(POISON)
  end
end

#deliver(*pair) ⇒ Object 



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# File 'lib/march_hare/consumers/blocking.rb', line 53

def deliver(*pair)
  if (@cancelling.get || @cancelled.get) || JavaConcurrent::Thread.current_thread.interrupted?
    @internal_queue.offer(pair)
  else
    begin
      @internal_queue.put(pair)
    rescue JavaConcurrent::InterruptedException => e
      JavaConcurrent::Thread.current_thread.interrupt
    end
  end
end

#gracefully_shut_down ⇒ Object 



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# File 'lib/march_hare/consumers/blocking.rb', line 65

def gracefully_shut_down
  @cancelling.set(true)
  @internal_queue.offer(POISON)

  @terminated.set(true)
end

#start ⇒ Object 



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# File 'lib/march_hare/consumers/blocking.rb', line 22

def start
  interrupted = false
  until (@cancelling.get || @cancelled.get) || JavaConcurrent::Thread.current_thread.interrupted?
    begin
      pair = @internal_queue.take
      if pair
        if pair == POISON
          @cancelling.set(true)
        else
          @callback.call(*pair)
        end
      end
    rescue JavaConcurrent::InterruptedException => e
      interrupted = true
    end
  end
  while (pair = @internal_queue.poll)
    if pair
      if pair == POISON
        @cancelling.set(true)
      else
        @callback.call(*pair)
      end
    end
  end
  @terminated.set(true)
  if interrupted
    JavaConcurrent::Thread.current_thread.interrupt
  end
end