public function getDefinitionCache()
	{
		if( !isset($this->definitionCache)) {
			return null;
		}
		if( ! isset($this->_dc)) {
			if( is_string($this->definitionCache)) {
				$this->_dc = Yii::$app->get($this->definitionCache);
			} elseif( is_array($this->definitionCache)) {
				$this->_dc = Yii::createObject($this->definitionCache);
			}  elseif( is_object($this->definitionCache)) {
				$this->_dc = $this->definitionCache;
			}  else {
				throw new InvalidConfigException('invalid "definitionCache" attribute : string or object expected');
			}
			if( ! $this->_dc instanceof yii\caching\Cache ) {
				throw new InvalidConfigException('the workflow definition cache must implement the yii\caching\Cache interface');
			}
		}
		return $this->_dc;
	}
public function getDefinitionCache()
	{
		if( !isset($this->definitionCache)) {
			return null;
		}
		if( ! isset($this->_dc)) {
			if( is_string($this->definitionCache)) {
				$this->_dc = Yii::$app->get($this->definitionCache);
			} elseif( is_array($this->definitionCache)) {
				$this->_dc = Yii::createObject($this->definitionCache);
			}  elseif( is_object($this->definitionCache)) {
				$this->_dc = $this->definitionCache;
			}  else {
				throw new InvalidConfigException('invalid "definitionCache" attribute : string or object expected');
			}
			if( ! $this->_dc instanceof yii\caching\Cache ) {
				throw new InvalidConfigException('the workflow definition cache must implement the yii\caching\Cache interface');
			}
		}
		return $this->_dc;
	}
public function getDefinitionCache ( ) { if ( ! isset ( $ this -> definitionCache ) ) { return null ; } if ( ! isset ( $ this -> _dc ) ) { if ( is_string ( $ this -> definitionCache ) ) { $ this -> _dc = Yii :: $ app -> get ( $ this -> definitionCache ) ; } elseif ( is_array ( $ this -> definitionCache ) ) { $ this -> _dc = Yii :: createObject ( $ this -> definitionCache ) ; } elseif ( is_object ( $ this -> definitionCache ) ) { $ this -> _dc = $ this -> definitionCache ; } else { throw new InvalidConfigException ( 'invalid "definitionCache" attribute : string or object expected' ) ; } if ( ! $ this -> _dc instanceof yii \ caching \ Cache ) { throw new InvalidConfigException ( 'the workflow definition cache must implement the yii\caching\Cache interface' ) ; } } return $ this -> _dc ; }
Return the workflow definition cache component used by this workflow source or NULL
if no cache is used.

@throws InvalidConfigException
@return NULL|yii\caching\Cache
Return the workflow definition cache component used by this workflow source or NULL if no cache is used .