/**
  * Acquires current action lock.
  * @return boolean lock acquiring result.
  */
 protected function acquireMutex()
 {
     $this->mutex = Instance::ensure($this->mutex, Mutex::className());
     return $this->mutex->acquire($this->composeMutexName());
 }
 /**
  * @return \yii\mutex\Mutex
  * @throws \yii\base\InvalidConfigException
  */
 protected function getMutex()
 {
     return Instance::ensure($this->mutexID, Mutex::className());
 }