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libphutil/src/future/exec/PhutilSignalRouter.php
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PhutilSignalRouter.php
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<?php
final class PhutilSignalRouter extends Phobject {
private $handlers = array();
private static $router;
private function __construct() {
// <private>
}
public static function initialize() {
if (!self::$router) {
$router = new self();
// If pcntl_signal() does not exist (particularly, on Windows), just
// don't install signal handlers.
if (function_exists('pcntl_signal')) {
pcntl_signal(SIGHUP, array($router, 'routeSignal'));
pcntl_signal(SIGTERM, array($router, 'routeSignal'));
}
self::$router = $router;
}
return self::getRouter();
}
public static function getRouter() {
if (!self::$router) {
throw new Exception(pht('Signal router has not been initialized!'));
}
return self::$router;
}
public function installHandler($key, PhutilSignalHandler $handler) {
if (isset($this->handlers[$key])) {
throw new Exception(
pht(
'Signal handler with key "%s" is already installed.',
$key));
}
$this->handlers[$key] = $handler;
return $this;
}
public function getHandler($key) {
return idx($this->handlers, $key);
}
public function routeSignal($signo) {
$exceptions = array();
$handlers = $this->handlers;
foreach ($handlers as $key => $handler) {
try {
if ($handler->canHandleSignal($this, $signo)) {
$handler->handleSignal($this, $signo);
}
} catch (Exception $ex) {
$exceptions[] = $ex;
}
}
if ($exceptions) {
throw new PhutilAggregateException(
pht(
'Signal handlers raised exceptions while handling "%s".',
phutil_get_signal_name($signo)));
}
switch ($signo) {
case SIGTERM:
// Normally, PHP doesn't invoke destructors when exiting in response to
// a signal. This forces it to do so, so we have a fighting chance of
// releasing any locks, leases or resources on our way out.
exit(128 + $signo);
}
}
}
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