Class: NegationObservation

Inherits:
Observation show all
Defined in:
lib/MINT-core/mapping/observation/negation_observation.rb

Instance Method Summary collapse

Methods inherited from Observation

#call_subscribed_callbacks, #element, #fail, #id, #initialize, #is_continuous?, #is_instant?, #is_onchange?, #is_subscribed_callback, #name, #result, #resultName, #states, #stop

Constructor Details

This class inherits a constructor from Observation

Instance Method Details

#check_true_at_startup(cb) ⇒ Object 



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# File 'lib/MINT-core/mapping/observation/negation_observation.rb', line 3

def check_true_at_startup(cb)
  # check if observation is already true at startup
  model = MINT::Interactor.class_from_channel_name(element)
  e = model.get(name)
  p "Error interactor #{name} of class #{model} is not available!" if e.nil?
  e_states= e.states.map &:to_s
  if e
    if ((e_states & states).length == 0) and ((e.abstract_states.split('|') & states).length == 0)
      cb.call element, true, result(MultiJson.decode e.to_json(:only => e.class::PUBLISH_ATTRIBUTES)),id
      return true
    end
  end
  return false
end

#start(observations_results, cb) ⇒ Object 



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# File 'lib/MINT-core/mapping/observation/negation_observation.rb', line 18

def start(observations_results,cb)
  @observation_results=observations_results

  res = false

  res = check_true_at_startup(cb) if is_continuous? or is_instant?

  if not res and is_instant? # instant checks do not require a subscribe and directly fail if false
    fail(cb)
    return self
  end

  return self if res and is_instant?

  redis = RedisConnector.redis
  @proc_observation = Proc.new { |key,message|
    if @should_listen
      found=MultiJson.decode message

      if name.nil? or name.eql? found["name"]

        if found.has_key? "new_states"
          if (found["new_states"] & states).length==0 # checks if both arrays share no element

            cb.call element, true , result(found),id
          else
            if (found["states"] & states).length > 0
              cb.call element, false, {},id
            end
          end
        end
      end
    end
  }

  if not    @cb_observation_has_subscribed
    @should_listen = true
    redis.pubsub.psubscribe("#{element}*",@proc_observation).callback {
      @cb_observation_has_subscribed = true
      call_subscribed_callbacks
    }
  end
  self
end