/**
* Seperate the job from the worker via pcntl_fork
*
* @param Job $job
*/
public function perform(Job $job)
{
$this->child = Resque::fork();
// Forked and we're the child. Run the job.
if ($this->child === 0) {
parent::perform($job);
exit(0);
}
// Parent process, sit and wait
if ($this->child > 0) {
$status = 'Forked ' . $this->child . ' at ' . strftime('%F %T');
$this->worker->updateProcLine($status);
$this->worker->log($status);
// Wait until the child process finishes before continuing
pcntl_wait($status);
$exitStatus = pcntl_wexitstatus($status);
if ($exitStatus !== 0) {
$job->fail(new Job\DirtyExitException('Job exited with exit code ' . $exitStatus));
}
}
$this->child = null;
}
/**
* The primary loop for a worker which when called on an instance starts
* the worker's life cycle.
*
* Queues are checked every $interval (seconds) for new jobs.
*
* @param int $interval How often to check for new jobs across the queues.
*/
public function work($interval = Resque::DEFAULT_INTERVAL, $blocking = false)
{
$this->updateProcLine('Starting');
$this->startup();
while (true) {
if ($this->shutdown) {
break;
}
// Attempt to find and reserve a job
$job = false;
if (!$this->paused) {
if ($blocking === true) {
$this->logger->log(LogLevel::INFO, 'Starting blocking with timeout of {interval}', array('interval' => $interval));
$this->updateProcLine('Waiting for ' . implode(',', $this->queues) . ' with blocking timeout ' . $interval);
} else {
$this->updateProcLine('Waiting for ' . implode(',', $this->queues) . ' with interval ' . $interval);
}
$job = $this->reserve($blocking, $interval);
}
if (!$job) {
// For an interval of 0, break now - helps with unit testing etc
if ($interval == 0) {
break;
}
if ($blocking === false) {
// If no job was found, we sleep for $interval before continuing and checking again
$this->logger->log(LogLevel::INFO, 'Sleeping for {interval}', array('interval' => $interval));
if ($this->paused) {
$this->updateProcLine('Paused');
} else {
$this->updateProcLine('Waiting for ' . implode(',', $this->queues));
}
usleep($interval * 1000000);
}
continue;
}
$this->logger->log(LogLevel::NOTICE, 'Starting work on {job}', array('job' => $job));
Event::trigger('beforeFork', $job);
$this->workingOn($job);
$this->child = Resque::fork();
// Forked and we're the child. Run the job.
if ($this->child === 0 || $this->child === false) {
$status = 'Processing ' . $job->queue . ' since ' . strftime('%F %T');
$this->updateProcLine($status);
$this->logger->log(LogLevel::INFO, $status);
$this->perform($job);
if ($this->child === 0) {
exit(0);
}
}
if ($this->child > 0) {
// Parent process, sit and wait
$status = 'Forked ' . $this->child . ' at ' . strftime('%F %T');
$this->updateProcLine($status);
$this->logger->log(LogLevel::INFO, $status);
// Wait until the child process finishes before continuing
pcntl_wait($status);
$exitStatus = pcntl_wexitstatus($status);
if ($exitStatus !== 0) {
$job->fail(new DirtyExitException('Job exited with exit code ' . $exitStatus));
}
}
$this->child = null;
$this->doneWorking();
}
$this->unregisterWorker();
}
