Class: Metacosm::RemoteSimulation

Inherits:
Simulation show all
Defined in:
lib/metacosm/remote_simulation.rb

Instance Method Summary collapse

Methods inherited from Simulation

#apply_event, #clear!, #command_queue, #conduct!, #construct_handler_for, #construct_listener_for, current, #disable_local_events, #event_queue, #events, #execute, #halt!, #handler_for, #listener_for, #local_events_disabled?, #mutex, #on_event, #params, #receive, #received_commands, #subscribe_for_commands

Constructor Details

#initialize(command_queue, event_stream) ⇒ RemoteSimulation

Returns a new instance of RemoteSimulation.



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# File 'lib/metacosm/remote_simulation.rb', line 3

def initialize(command_queue, event_stream)
  @command_queue_name = command_queue
  @event_stream_name  = event_stream
  setup_connection
end

Instance Method Details

#apply(command) ⇒ Object 



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# File 'lib/metacosm/remote_simulation.rb', line 9

def apply(command); fire command end

#fire(command) ⇒ Object 



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# File 'lib/metacosm/remote_simulation.rb', line 11

def fire(command)
  puts "---> Firing command at remote sim..."
  puts "[command: #{command.inspect}]"
  command_dto = command.attrs.merge(handler_module: command.handler_module_name, handler_class_name: command.handler_class_name)

  Thread.new do
    REDIS_PUB.with do |redis|
      puts "---> Sending command over redis conn: #{redis.inspect}"
      redis.publish(@command_queue_name, Marshal.dump(command_dto))
    end
  end
  puts "---> Sent!"
  true
end

#received_events ⇒ Object 



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# File 'lib/metacosm/remote_simulation.rb', line 26

def received_events
  @events_received ||= []
end

#setup_connection ⇒ Object 



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# File 'lib/metacosm/remote_simulation.rb', line 30

def setup_connection
  @remote_listener_thread = Thread.new do
    begin
      REDIS_SUB.with do |redis|
        redis.subscribe(@event_stream_name) do |on|
          on.subscribe do |channel, subscriptions|
            puts "Subscribed to remote simulation event stream ##{channel} (#{subscriptions} subscriptions)"
          end

          on.message do |channel, message|
            event = Marshal.load(message)
            listener_module_name = event.delete(:listener_module)
            listener_class_name = event.delete(:listener_class_name)
            module_name = listener_module_name
            module_name = "Object" if module_name.empty?
            listener = (module_name.constantize).const_get(listener_class_name).new(self)
            listener.receive(event)

            received_events.push(event)
          end

          on.unsubscribe do |channel, subscriptions|
            puts "Unsubscribed from remote simulation event stream ##{channel} (#{subscriptions} subscriptions)"
          end
        end
      end
    rescue ::Redis::BaseConnectionError => error
      puts "#{error}, retrying in 1s"
      sleep 1
      retry
    end
  end
end