Class: AutoScale

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

Defined Under Namespace

Modules: LOAD_LISTENER

Constant Summary collapse

LOAD_DECREMENT_FACTOR =

2x times

2

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#current_pid_switch ⇒ Object

Returns the value of attribute current_pid_switch.



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# File 'lib/auto_scale.rb', line 10

def current_pid_switch
  @current_pid_switch
end

#current_workers_count ⇒ Object

Returns the value of attribute current_workers_count.



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# File 'lib/auto_scale.rb', line 10

def current_workers_count
  @current_workers_count
end

#high_load ⇒ Object

Returns the value of attribute high_load.



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# File 'lib/auto_scale.rb', line 12

def high_load
  @high_load
end

#interrupted ⇒ Object

Returns the value of attribute interrupted.



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# File 'lib/auto_scale.rb', line 12

def interrupted
  @interrupted
end

#previous_pid_switch ⇒ Object

Returns the value of attribute previous_pid_switch.



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# File 'lib/auto_scale.rb', line 10

def previous_pid_switch
  @previous_pid_switch
end

#previous_workers_count ⇒ Object

Returns the value of attribute previous_workers_count.



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# File 'lib/auto_scale.rb', line 10

def previous_workers_count
  @previous_workers_count
end

#queue ⇒ Object

Returns the value of attribute queue.



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# File 'lib/auto_scale.rb', line 10

def queue
  @queue
end

#stopped ⇒ Object

Returns the value of attribute stopped.



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# File 'lib/auto_scale.rb', line 10

def stopped
  @stopped
end

Instance Method Details

#exit ⇒ Object 



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# File 'lib/auto_scale.rb', line 53

def exit
  stop self.current_workers_count
end

#increment_or_decrement ⇒ Object 



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# File 'lib/auto_scale.rb', line 57

def increment_or_decrement
  if jobs_count > 0
    load = LoadMonitor.can_increase_load?(self.max_cpu_load, self.max_memory_load)    
    self.current_workers_count += self.increment_step if(load  && self.previous_workers_count < self.max_workers)
    self.current_workers_count -= self.decrement_step if(!load && self.previous_workers_count > self.min_workers)
    self.current_workers_count  = 0 if self.current_workers_count < 0
  else
    self.current_workers_count = self.min_workers
  end
  scale_workers
  sleep(self.sleep_time)
end

#jobs_count ⇒ Object 



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# File 'lib/auto_scale.rb', line 49

def jobs_count
  ScaleWorkers.configuration.count_procedure(self.queue, self.max_failure)
end

#monitor ⇒ Object 



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# File 'lib/auto_scale.rb', line 14

def monitor
  bind_interrupt_listener
  usage_listener = bind_high_usage_listener
  monitor_workers
ensure
  Thread.kill(usage_listener) if usage_listener
end

#monitor_workers ⇒ Object 



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# File 'lib/auto_scale.rb', line 22

def monitor_workers
  loop do
    begin
      if self.interrupted
        exit
        break
      elsif self.high_load
        high_load_decrement
        scale_workers
        self.high_load = false
      else
        increment_or_decrement
      end
    rescue Exception => e
      self.interrupted = true
    end
  end
end

#start(count) ⇒ Object 



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# File 'lib/auto_scale.rb', line 45

def start(count)
  ScaleWorkers.configuration.start_procedure(self.queue, count)
end

#stop(count) ⇒ Object 



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# File 'lib/auto_scale.rb', line 41

def stop(count)
  ScaleWorkers.configuration.stop_procedure(self.queue, count)
end