public function getProcessId(): ?string
    {
        if (is_null($this->processId)) {
            return $this->parameter(ResourceRegistrar::PARAM_PROCESS_ID);
        }

        return $this->processId ?: null;
    }
public function getProcessId(): ?string
    {
        if (is_null($this->processId)) {
            return $this->parameter(ResourceRegistrar::PARAM_PROCESS_ID);
        }

        return $this->processId ?: null;
    }
public function getProcessId ( ) : ? string { if ( is_null ( $ this -> processId ) ) { return $ this -> parameter ( ResourceRegistrar :: PARAM_PROCESS_ID ) ; } return $ this -> processId ? : null ; }
Get the process id for the route.

@return string|null
Get the process id for the route .