Class: Symian::Simulation

Inherits:
Object
  • Object
show all
Defined in:
lib/symian/simulation.rb

Constant Summary collapse

ATTRIBUTES = 
[ :start_time ]

Instance Method Summary collapse

Constructor Details

#initialize(configuration, performance_analyzer, trace = TraceCollector.new(:memory)) ⇒ Simulation

Returns a new instance of Simulation.



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# File 'lib/symian/simulation.rb', line 19

def initialize(configuration, performance_analyzer, trace=TraceCollector.new(:memory))
  @configuration = configuration

  # setup performance analyzer and simulation trace
  @performance_analyzer = performance_analyzer
  @trace = trace

  # setup simulation start and current time
  @current_time = @start_time = @configuration.start_time

  # create support groups
  @support_groups = {}
  @configuration.support_groups.each do |name,conf|
    @support_groups[name] = SupportGroup.new(name, self, conf[:work_time], conf[:operators])
  end

  # create transition matrix
  @transition_matrix = TransitionMatrix.new(@configuration.transition_matrix)

  # create event queue
  @event_queue = SortedArray.new
end

Instance Method Details

#new_event(type, data, time, destination) ⇒ Object 



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# File 'lib/symian/simulation.rb', line 43

def new_event(type, data, time, destination)
  @event_queue << Event.new(type, data, time, destination)
end

#now ⇒ Object 



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# File 'lib/symian/simulation.rb', line 48

def now
  @current_time
end

#run ⇒ Object 



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# File 'lib/symian/simulation.rb', line 53

def run

  # initialize support groups
  @support_groups.values.each do |sg|
    sg.initialize_at(@configuration.start_time)
  end

  # generate first incident
  ig = IncidentGenerator.new(self, @configuration.incident_generation)
  ig.generate

  # schedule end of simulation
  unless @configuration.end_time.nil?
    # puts "Simulation ends at: #{@configuration.end_time}"
    new_event(Event::ET_END_OF_SIMULATION, nil, @configuration.end_time, nil)
  end

  # calculate warmup threshold
  warmup_threshold = @configuration.start_time + @configuration.warmup_duration

  @incidents_being_worked_on ||= []

  # launch simulation
  until @event_queue.empty?
    e = @event_queue.shift

    # sanity check on simulation time flow
    if @current_time > e.time
      raise 'Error: simulation time inconsistency for event ' +
            "e.type=#{e.type} @current_time=#{@current_time}, e.time=#{e.time}"
    end

    @current_time = e.time

    #Trace.new_event e
    case e.type
      when Event::ET_INCIDENT_ARRIVAL

        sg_name = @transition_matrix.escalation('In')

        sg = @support_groups[sg_name]
        sg.new_incident(e.data, e.time)

        @incidents_being_worked_on << e.data

        # generate next incident
        ig.generate

        # TODO: pinpoint instant for calculation of time spent in enqueued state


      when Event::ET_INCIDENT_ASSIGNMENT

        # TODO: implement calculation of time spent in suspended state


      when Event::ET_OPERATOR_ACTIVITY_STARTS


      when Event::ET_OPERATOR_ACTIVITY_FINISHES

        sg = @support_groups[e.destination]
        sg.operator_finished_working(e.data[0], e.time)


      when Event::ET_INCIDENT_RESCHEDULING

        sg = @support_groups[e.destination]
        sg.schedule_incident_for_reassignment(e.data[0], e.data[1], e.time)

        # TODO: pinpoint instant for calculation of time spent in suspended state


      when Event::ET_INCIDENT_ESCALATION
        inc = e.data

        sg_name = @transition_matrix.escalation(e.destination)
        if sg_name == "Out"
          inc.closure_time = e.time

          # remove incident from list of incidents being worked on and add it to trace
          @incidents_being_worked_on.delete(inc)
          @trace.record_incidents(inc)
        else
          sg = @support_groups[sg_name]
          sg.new_incident(inc, e.time)
        end


      when Event::ET_OPERATOR_LEAVING

        sg = @support_groups[e.destination]
        sg.operator_going_home(e.data, e.time)


      when Event::ET_OPERATOR_RETURNING

        sg = @support_groups[e.destination]
        sg.operator_arrived_at_work(e.data, e.time)


      when Event::ET_SUPPORT_GROUP_QUEUE_SIZE_CHANGE


      when Event::ET_END_OF_SIMULATION
        break

    end
  end

  # save trace file
  @trace.save_and_close
  kpis = @performance_analyzer.calculate_kpis(@trace)
  kpis.merge(incidents_being_worked_on: @incidents_being_worked_on.size)

end