Class: Adaptation::Mom::DrubySubscriber

Inherits:
Object
  • Object
show all
Defined in:
lib/adaptation/druby_subscriber.rb

Instance Method Summary collapse

Constructor Details

#initialize(subscriber_uri, mom_uri, topics) ⇒ DrubySubscriber

constructor, called from the subscribe command



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# File 'lib/adaptation/druby_subscriber.rb', line 11

def initialize subscriber_uri, mom_uri, topics
  @subscriber_uri = subscriber_uri
  @mom_uri = mom_uri
  @topics = topics
  @messages = []
end

Instance Method Details

#send_message(message, topic) ⇒ Object

method to receive messages, called from the mom



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# File 'lib/adaptation/druby_subscriber.rb', line 19

def send_message message, topic 
  # Insert message into messages buffer, and awake
  # message processor (@sleeper) if paused
  puts "-----------------------------------"
  puts "Received message in topic: #{topic}"
  puts "#{message}"
  puts "-----------------------------------"
  @messages << {:message => message, :topic => topic}
  @sleeper.run if @sleeper.stop?
end

#start ⇒ Object 



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# File 'lib/adaptation/druby_subscriber.rb', line 36

def start
	begin
	  # try to start the subscriber service,
	  # using the uri specified in config/mom.yml
    DRb.start_service(@subscriber_uri, self)
    
	  # subscribe that uri to the mom
	  mom = DRbObject.new(nil, @mom_uri)
    mom.subscribe @subscriber_uri
	rescue Exception => e
    # desired uri already in use
    puts "Couldn't start subscriber at #{@subscriber_uri}. Address already in use?"
    return
	end	
 
  @sleeper = Thread.new{
    loop do 

      # process all messages
      while !@messages.empty?
        @messages.each do |message|         
          if ( (@topics.include?(message[:topic])) or (@topics.include?("all")) )
            system("ruby public/dispatch.rb '#{message[:message]}'") 
          end
          @messages.delete message
        end
      end

      # go to sleep
      Thread.stop
    
    end
  }

  @sleeper.join
  Drb.thread.join

end

#subscription_result(subscribed) ⇒ Object 



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# File 'lib/adaptation/druby_subscriber.rb', line 30

def subscription_result subscribed
  if subscribed
    puts "Subscribed to mom (#{@mom_uri}). Listening at #{@subscriber_uri}"
  end
end