public function getListenerInstance()
    {
        if (null !== $this->_listener && null === $this->listenerInstance) {
            $this->listenerInstance = new $this->_listener();
        }

        return $this->listenerInstance;
    }
public function getListenerInstance()
    {
        if (null !== $this->_listener && null === $this->listenerInstance) {
            $this->listenerInstance = new $this->_listener();
        }

        return $this->listenerInstance;
    }
public function getListenerInstance ( ) { if ( null !== $ this -> _listener && null === $ this -> listenerInstance ) { $ this -> listenerInstance = new $ this -> _listener ( ) ; } return $ this -> listenerInstance ; }
Creates an instance of the listener based on the provided namespace and return it or null
if listener namespace is not setted.

@return null|ListenerInterface
Creates an instance of the listener based on the provided namespace and return it or null if listener namespace is not setted .