Subversion Repositories php-qbpwcf

<?php

namespace React\EventLoop;

use BadMethodCallException;

use Event;

use EventBase;

use React\EventLoop\Tick\FutureTickQueue;

use React\EventLoop\Timer\Timer;

use SplObjectStorage;

/**

 * An `ext-event` based event loop.

 *

 * This uses the [`event` PECL extension](https://pecl.php.net/package/event).

 * It supports the same backends as libevent.

 *

 * This loop is known to work with PHP 5.4 through PHP 7+.

 *

 * @link https://pecl.php.net/package/event

 */

final class ExtEventLoop implements LoopInterface

{

    private $eventBase;

    private $futureTickQueue;

    private $timerCallback;

    private $timerEvents;

    private $streamCallback;

    private $readEvents = array();

    private $writeEvents = array();

    private $readListeners = array();

    private $writeListeners = array();

    private $readRefs = array();

    private $writeRefs = array();

    private $running;

    private $signals;

    private $signalEvents = array();

    public function __construct()

    {

        if (!\class_exists('EventBase', false)) {

            throw new BadMethodCallException('Cannot create ExtEventLoop, ext-event extension missing');

        }

        // support arbitrary file descriptors and not just sockets

        // Windows only has limited file descriptor support, so do not require this (will fail otherwise)

        // @link http://www.wangafu.net/~nickm/libevent-book/Ref2_eventbase.html#_setting_up_a_complicated_event_base

        $config = new \EventConfig();

        if (\DIRECTORY_SEPARATOR !== '\\') {

            $config->requireFeatures(\EventConfig::FEATURE_FDS);

        }

        $this->eventBase = new EventBase($config);

        $this->futureTickQueue = new FutureTickQueue();

        $this->timerEvents = new SplObjectStorage();

        $this->signals = new SignalsHandler();

        $this->createTimerCallback();

        $this->createStreamCallback();

    }

    public function __destruct()

    {

        // explicitly clear all references to Event objects to prevent SEGFAULTs on Windows

        foreach ($this->timerEvents as $timer) {

            $this->timerEvents->detach($timer);

        }

        $this->readEvents = array();

        $this->writeEvents = array();

    }

    public function addReadStream($stream, $listener)

    {

        $key = (int) $stream;

        if (isset($this->readListeners[$key])) {

            return;

        }

        $event = new Event($this->eventBase, $stream, Event::PERSIST | Event::READ, $this->streamCallback);

        $event->add();

        $this->readEvents[$key] = $event;

        $this->readListeners[$key] = $listener;

        // ext-event does not increase refcount on stream resources for PHP 7+

        // manually keep track of stream resource to prevent premature garbage collection

        if (\PHP_VERSION_ID >= 70000) {

            $this->readRefs[$key] = $stream;

        }

    }

    public function addWriteStream($stream, $listener)

    {

        $key = (int) $stream;

        if (isset($this->writeListeners[$key])) {

            return;

        }

        $event = new Event($this->eventBase, $stream, Event::PERSIST | Event::WRITE, $this->streamCallback);

        $event->add();

        $this->writeEvents[$key] = $event;

        $this->writeListeners[$key] = $listener;

        // ext-event does not increase refcount on stream resources for PHP 7+

        // manually keep track of stream resource to prevent premature garbage collection

        if (\PHP_VERSION_ID >= 70000) {

            $this->writeRefs[$key] = $stream;

        }

    }

    public function removeReadStream($stream)

    {

        $key = (int) $stream;

        if (isset($this->readEvents[$key])) {

            $this->readEvents[$key]->free();

            unset(

                $this->readEvents[$key],

                $this->readListeners[$key],

                $this->readRefs[$key]

            );

        }

    }

    public function removeWriteStream($stream)

    {

        $key = (int) $stream;

        if (isset($this->writeEvents[$key])) {

            $this->writeEvents[$key]->free();

            unset(

                $this->writeEvents[$key],

                $this->writeListeners[$key],

                $this->writeRefs[$key]

            );

        }

    }

    public function addTimer($interval, $callback)

    {

        $timer = new Timer($interval, $callback, false);

        $this->scheduleTimer($timer);

        return $timer;

    }

    public function addPeriodicTimer($interval, $callback)

    {

        $timer = new Timer($interval, $callback, true);

        $this->scheduleTimer($timer);

        return $timer;

    }

    public function cancelTimer(TimerInterface $timer)

    {

        if ($this->timerEvents->contains($timer)) {

            $this->timerEvents[$timer]->free();

            $this->timerEvents->detach($timer);

        }

    }

    public function futureTick($listener)

    {

        $this->futureTickQueue->add($listener);

    }

    public function addSignal($signal, $listener)

    {

        $this->signals->add($signal, $listener);

        if (!isset($this->signalEvents[$signal])) {

            $this->signalEvents[$signal] = Event::signal($this->eventBase, $signal, array($this->signals, 'call'));

            $this->signalEvents[$signal]->add();

        }

    }

    public function removeSignal($signal, $listener)

    {

        $this->signals->remove($signal, $listener);

        if (isset($this->signalEvents[$signal]) && $this->signals->count($signal) === 0) {

            $this->signalEvents[$signal]->free();

            unset($this->signalEvents[$signal]);

        }

    }

    public function run()

    {

        $this->running = true;

        while ($this->running) {

            $this->futureTickQueue->tick();

            $flags = EventBase::LOOP_ONCE;

            if (!$this->running || !$this->futureTickQueue->isEmpty()) {

                $flags |= EventBase::LOOP_NONBLOCK;

            } elseif (!$this->readEvents && !$this->writeEvents && !$this->timerEvents->count() && $this->signals->isEmpty()) {

                break;

            }

            $this->eventBase->loop($flags);

        }

    }

    public function stop()

    {

        $this->running = false;

    }

    /**

     * Schedule a timer for execution.

     *

     * @param TimerInterface $timer

     */

    private function scheduleTimer(TimerInterface $timer)

    {

        $flags = Event::TIMEOUT;

        if ($timer->isPeriodic()) {

            $flags |= Event::PERSIST;

        }

        $event = new Event($this->eventBase, -1, $flags, $this->timerCallback, $timer);

        $this->timerEvents[$timer] = $event;

        $event->add($timer->getInterval());

    }

    /**

     * Create a callback used as the target of timer events.

     *

     * A reference is kept to the callback for the lifetime of the loop

     * to prevent "Cannot destroy active lambda function" fatal error from

     * the event extension.

     */

    private function createTimerCallback()

    {

        $timers = $this->timerEvents;

        $this->timerCallback = function ($_, $__, $timer) use ($timers) {

            \call_user_func($timer->getCallback(), $timer);

            if (!$timer->isPeriodic() && $timers->contains($timer)) {

                $this->cancelTimer($timer);

            }

        };

    }

    /**

     * Create a callback used as the target of stream events.

     *

     * A reference is kept to the callback for the lifetime of the loop

     * to prevent "Cannot destroy active lambda function" fatal error from

     * the event extension.

     */

    private function createStreamCallback()

    {

        $read =& $this->readListeners;

        $write =& $this->writeListeners;

        $this->streamCallback = function ($stream, $flags) use (&$read, &$write) {

            $key = (int) $stream;

            if (Event::READ === (Event::READ & $flags) && isset($read[$key])) {

                \call_user_func($read[$key], $stream);

            }

            if (Event::WRITE === (Event::WRITE & $flags) && isset($write[$key])) {

                \call_user_func($write[$key], $stream);

            }

        };

    }

}