public function getSystemService(): SystemService
    {
        if ($this->_systemService === null) {
            $this->_systemService = new SystemService();
        }

        return $this->_systemService;
    }
public function getSystemService(): SystemService
    {
        if ($this->_systemService === null) {
            $this->_systemService = new SystemService();
        }

        return $this->_systemService;
    }
public function getSystemService ( ) : SystemService { if ( $ this -> _systemService === null ) { $ this -> _systemService = new SystemService ( ) ; } return $ this -> _systemService ; }
Returns the value of field _systemService.

@return SystemService
Returns the value of field _systemService .