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, #receive, #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 13

def apply(command); fire command end

#fire(command) ⇒ Object 



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# File 'lib/metacosm/remote_simulation.rb', line 15

def fire(command)
  command_dto = command.attrs.merge(handler_module: command.handler_module_name, handler_class_name: command.handler_class_name)
  redis = redis_connection
  redis.publish(@command_queue_name, Marshal.dump(command_dto))
end

#redis_connection ⇒ Object 



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

def redis_connection
  Redis.new
end

#setup_connection ⇒ Object 



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# File 'lib/metacosm/remote_simulation.rb', line 21

def setup_connection
  @remote_listener_thread = Thread.new do
    begin
      redis = redis_connection
      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)
        end

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