function process(Queue $queue)
{
if (file_exists($this->pidFile)) {
$serverPid = trim(file_get_contents($this->pidFile));
# When the process is not running anymore and a PID file exists
# than the PID file was not correctly unlinked on the last shutdown.
if (!posix_kill($serverPid, 0)) {
unlink($this->pidFile);
} else {
throw new UnexpectedValueException("Server is already running with PID {$serverPid}.");
}
}
if (false === @file_put_contents($this->pidFile, posix_getpid())) {
throw new UnexpectedValueException(sprintf('Could not create %s. Maybe you have no permission to write it.', $this->pidFile));
}
$this->selfPipe = stream_socket_pair(STREAM_PF_UNIX, STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);
$this->queue = $queue;
$queue->process($this);
# Spawn up the initial worker pool.
$this->spawnWorkers();
register_shutdown_function(array($this, "stopListening"));
pcntl_signal(SIGTTIN, array($this, "incrementWorkerCount"));
pcntl_signal(SIGTTOU, array($this, "decrementWorkerCount"));
pcntl_signal(SIGQUIT, array($this, "shutdown"));
pcntl_signal(SIGINT, function () {
exit;
});
# Monitor the child processes.
for (;;) {
pcntl_signal_dispatch();
if ($this->shutdown) {
foreach ($this->workers as $pid => $info) {
posix_kill($pid, SIGQUIT);
pcntl_waitpid($pid, $procStatus);
}
$this->stopListening();
return;
}
$read = array($this->selfPipe[1]);
$write = null;
$exception = null;
$readySize = @stream_select($read, $write, $exception, 10);
# Handle the heartbeat sent by a worker.
if ($readySize > 0 and $read) {
$childPid = trim(fgets($read[0]));
$this->workers[$childPid]["heartbeat"] = time();
}
$this->removeStaleWorkers();
# Maintain a stable worker count. Compares the actual worker count
# to the configured worker count and spawns workers when necessary.
$this->spawnWorkers();
}
}
function process(Queue $queue)
{
$queue->process($this);
for (;;) {
$job = $queue->pop();
if ($job) {
$this->emit('init', array($job));
$self = $this;
set_error_handler(function ($code, $message, $file, $line) use($job, $self) {
throw new \ErrorException($message, $code, 0, $file, $line);
});
try {
$job->run();
$this->emit('success', array($job));
} catch (\Exception $e) {
$this->emit('exception', array($job, $e));
}
restore_error_handler();
}
}
}