void triggerAction(MemoryUsage usage) {

  {- -------------------------------------------
  (1) MemoryImpl.createNotification() を呼び出して, リスナーに通知を行う.
      ---------------------------------------- -}

                MemoryImpl.createNotification(MEMORY_COLLECTION_THRESHOLD_EXCEEDED,
                                              pool.getName(),
                                              usage,
                                              gcSensor.getCount());
            }