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'));
	pcntl_signal(SIGWINCH, 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)),
	$exceptions);
	}

	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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