Backend\Core\Engine\Base\Cronjob::setBusyFile PHP Method

    protected function setBusyFile()
    {
        // do not set busy file in debug mode
        if ($this->getContainer()->getParameter('kernel.debug')) {
            return;
        }
        // build path
        $filesystem = new Filesystem();
        $path = $this->getCacheDirectory() . $this->getId() . '.busy';
        // init var
        $isBusy = false;
        // does the busy file already exists.
        if ($filesystem->exists($path)) {
            $isBusy = true;
            // grab counter
            $counter = (int) file_get_contents($path);
            // check the counter
            if ($counter > 9) {
                // build class name
                $class = 'Backend\\Modules\\' . $this->getModule() . '\\Cronjobs\\' . $this->getAction();
                if ($this->getModule() == 'Core') {
                    $class = 'Backend\\Core\\Cronjobs\\' . $this->getAction();
                }
                // notify user
                throw new BackendException('Cronjob (' . $class . ') is still busy after 10 runs, check it out!');
            }
        } else {
            $counter = 0;
        }
        // increment counter
        ++$counter;
        // store content
        $filesystem->dumpFile($path, $counter);
        // if the cronjob is busy we should NOT proceed
        if ($isBusy) {
            throw new ExitException('The cronjob is still busy');
        }
    }