Class: Loops::Queue

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

Instance Attribute Summary

Attributes inherited from Base

#config, #name

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

#initialize, #logger, #shutdown?, #with_lock, #with_period_of

Constructor Details

This class inherits a constructor from Loops::Base

Class Method Details

.check_dependencies ⇒ Object 



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# File 'lib/loops/queue.rb', line 11

def self.check_dependencies
  raise "No stomp gem installed!" unless defined?(Stomp::Client)
end

Instance Method Details

#process_message(msg) ⇒ Object 



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# File 'lib/loops/queue.rb', line 52

def process_message(msg)
  raise "This method process_message(msg) should be overriden in the loop class!"
end

#run ⇒ Object 



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# File 'lib/loops/queue.rb', line 15

def run
  create_client

  config['queue_name'] ||= "/queue/loops/#{name}"
  config['prefetch_size'] ||= 1
  debug "Subscribing for the queue #{config['queue_name']}..."

  headers = { :ack => :client }
  headers["activemq.prefetchSize"] = config['prefetch_size'] if config['prefetch_size']

  @total_served = 0
  @client.subscribe(config['queue_name'], headers) do |msg|
    begin
      if config['action_timeout']
        timeout(config['action_timeout']) { process_message(msg) }
      else
        process_message(msg)
      end

      @client.acknowledge(msg)
      @total_served += 1
      if config['max_requests'] && @total_served >= config['max_requests'].to_i
        disconnect_client_and_exit
      end
    rescue Exception => e
      error "Exception from process message! We won't be ACKing the message."
      error "Details: #{e} at #{e.backtrace.first}"
      disconnect_client_and_exit
    end
  end

  @client.join
rescue Exception => e
  error "Closing queue connection because of exception: #{e} at #{e.backtrace.first}"
  disconnect_client_and_exit
end