Class: EventQ::Amazon::QueueWorker

Inherits:
Object
  • Object
show all
Includes:
WorkerId
Defined in:
lib/eventq/eventq_aws/aws_queue_worker.rb

Constant Summary collapse

APPROXIMATE_RECEIVE_COUNT = 
'ApproximateReceiveCount'
MESSAGE = 
'Message'
AWS_MAX_VISIBILITY_TIMEOUT =

12h

43_200

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from WorkerId

#tag_processing_thread, #untag_processing_thread

Constructor Details

#initialize ⇒ QueueWorker

Returns a new instance of QueueWorker.



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# File 'lib/eventq/eventq_aws/aws_queue_worker.rb', line 16

def initialize
  @serialization_provider_manager = EventQ::SerializationProviders::Manager.new
  @signature_provider_manager = EventQ::SignatureProviders::Manager.new
  @calculate_visibility_timeout = Amazon::CalculateVisibilityTimeout.new(
    max_timeout: AWS_MAX_VISIBILITY_TIMEOUT
  )
end

Instance Attribute Details

#context ⇒ Object

Returns the value of attribute context.



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# File 'lib/eventq/eventq_aws/aws_queue_worker.rb', line 14

def context
  @context
end

Instance Method Details

#acknowledge_message(poller, msg) ⇒ Object

Logic for the RabbitMq adapter when a message is accepted



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# File 'lib/eventq/eventq_aws/aws_queue_worker.rb', line 76

def acknowledge_message(poller, msg)
  poller.delete_message(msg)
end

#configure(options = {}) ⇒ Object 



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# File 'lib/eventq/eventq_aws/aws_queue_worker.rb', line 69

def configure(options = {})
  options[:queue_poll_wait] ||= 10

  EventQ.logger.info("[#{self.class}] - Configuring. Queue Poll Wait: #{options[:queue_poll_wait]}")
end

#deserialize_message(payload) ⇒ Object 



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# File 'lib/eventq/eventq_aws/aws_queue_worker.rb', line 59

def deserialize_message(payload)
  provider = @serialization_provider_manager.get_provider(EventQ::Configuration.serialization_provider)
  provider.deserialize(payload)
end

#pre_process(context, options) ⇒ Object 



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# File 'lib/eventq/eventq_aws/aws_queue_worker.rb', line 24

def pre_process(context, options)
  # don't do anything specific to set up the process before threads are fired off.
end

#serialize_message(msg) ⇒ Object 



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# File 'lib/eventq/eventq_aws/aws_queue_worker.rb', line 64

def serialize_message(msg)
  provider = @serialization_provider_manager.get_provider(EventQ::Configuration.serialization_provider)
  provider.serialize(msg)
end

#thread_process_iteration(queue, options, block) ⇒ Object 



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# File 'lib/eventq/eventq_aws/aws_queue_worker.rb', line 28

def thread_process_iteration(queue, options, block)
  client = options[:client]
  manager = options[:manager] || EventQ::Amazon::QueueManager.new({ client: client })

  # get the queue
  queue_url = manager.get_queue(queue)
  poller = Aws::SQS::QueuePoller.new(queue_url, attribute_names: [APPROXIMATE_RECEIVE_COUNT])

  # Polling will block indefinitely unless we force it to stop
  poller.before_request do |stats|
    unless context.running?
      EventQ.logger.info("AWS Poller shutting down")
      throw :stop_polling
    end
  end

  poller.poll(skip_delete: true, wait_time_seconds: options[:queue_poll_wait]) do |msg, stats|
    begin
      tag_processing_thread
      process_message(msg, poller, queue, block)
    rescue => e
      EventQ.logger.error do
        "[#{self.class}] - An unhandled error occurred. Error: #{e} | Backtrace: #{e.backtrace}"
      end
      context.call_on_error_block(error: e)
    ensure
      untag_processing_thread
    end
  end
end