public function run()
{
while (true) {
$this->scaleAllQueues();
// @todo does detectHungJobs() need a different frequency?
$this->detectHungJobs();
JQWorker::sleep($this->scalerPollingInterval);
}
print "Autoscaler exiting.\n";
}
/**
* Starts the worker process.
*
* Blocks until the worker exists.
*/
public function start()
{
$this->log("Starting worker process on queue: " . ($this->options['queueName'] === NULL ? '(any)' : $this->options['queueName']));
if ($this->options['enableJitter']) {
$ms = rand(0, 999);
$this->log("Startup jitter: 0.{$ms} seconds...");
JQWorker::sleep(0, $ms * 1000000);
}
if (isset($this->options['adjustPriority'])) {
$this->adjustPriority($this->options['adjustPriority']);
}
$this->okToRun = true;
try {
while ($this->okToRun) {
$this->memCheck();
$this->codeCheck();
$this->currentJob = $this->jqStore->next($this->options['queueName']);
if ($this->currentJob) {
try {
$this->logJobStatus($this->currentJob, "Job checked out.");
// attempt to un-serialize the job
if ($this->currentJob->getJob() instanceof JQJob) {
$this->logJobStatus($this->currentJob, $this->currentJob->description());
$result = $this->currentJob->run($this->currentJob);
} else {
$this->currentJob->markJobFailed("JQManagedJob.job is not a JQJob instance.");
$result = "No JQJob found.";
}
if ($result === NULL) {
$this->logJobStatus($this->currentJob, "Done!");
} else {
$this->logJobStatus($this->currentJob, $result);
}
$this->currentJob = NULL;
} catch (Exception $e) {
if ($this->currentSignalNo === NULL) {
throw $e;
}
// we only handle signals here
// This block helps JQJobs minimize the incidence of jobs getting stuck in the "running" state
// It is designed to catch exceptions from JQJob->run() trying to record a finished ActualJob->run() disposition to JQStore
// although the job might've finished, we couldn't tell JQStore, thus the loop can't be closed
// Therefore, we will gracefullyRetryCurrentJob() so that it can run again another day and close out the loop gracefully
$result = $e->getMessage();
$this->logJobStatus($this->currentJob, "signal raised during job->run()", true);
$this->gracefullyRetryCurrentJob($this->currentJob);
$this->currentJob = NULL;
// now that we've cleaned up, the run loop will gracefully exit
}
$this->jobsProcessed++;
if ($this->options['exitAfterNJobs'] && $this->jobsProcessed >= $this->options['exitAfterNJobs']) {
break;
}
} else {
$this->log("No jobs available.");
if ($this->options['exitIfNoJobs']) {
$this->log("Exiting since exitIfNoJobs=true");
break;
} else {
$s = $this->options['wakeupEvery'];
$ms = 0;
if ($this->options['enableJitter']) {
$ms = rand(0, 999);
}
$this->log("Sleeping for {$s}.{$ms} seconds...");
JQWorker::sleep($s, $ms * 1000000);
}
}
}
} catch (Exception $e) {
if ($this->currentSignalNo === NULL) {
throw $e;
}
// we only handle signals here
// This block helps JQJobs minimize the incidence of jobs getting stuck in the "running" state
// It is designed to catch jobs that have been checked out but not yet run when a signal fires
// Therefore, we will gracefullyRetryCurrentJob() so that it can run again another day and close out the loop gracefully
$result = $e->getMessage();
$this->log("signal raised during run()");
$this->gracefullyRetryCurrentJob($this->currentJob);
exit(self::EXIT_CODE_SIGNAL);
}
$this->log("Stopping worker process on queue: " . ($this->options['queueName'] === NULL ? '(any)' : $this->options['queueName']));
}
