File "ExtEventLoop.php"
Full Path: /home/fundopuh/trader.fxex.org/vendor/react/event-loop/src/ExtEventLoop.php
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MIME-type: text/x-php
Charset: utf-8
<?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),
* that provides an interface to `libevent` library.
* `libevent` itself supports a number of system-specific backends (epoll, kqueue).
*
* This loop is known to work with PHP 5.4 through PHP 8+.
*
* @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);
}
};
}
}