/
ReplaySubject.php
170 lines (127 loc) · 4.03 KB
/
ReplaySubject.php
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<?php
declare(strict_types = 1);
namespace Rx\Subject;
use Rx\Disposable\CallbackDisposable;
use Rx\DisposableInterface;
use Rx\Observer\ScheduledObserver;
use Rx\ObserverInterface;
use Rx\Scheduler;
use Rx\SchedulerInterface;
/**
* Represents an object that is both an observable sequence as well as an observer.
* Each notification is broadcasted to all subscribed and future observers, subject to buffer trimming policies.
*/
class ReplaySubject extends Subject
{
/** @var int */
private $bufferSize;
/** @var int */
private $windowSize;
/** @var array */
private $queue = [];
/** @var int */
private $maxSafeInt = PHP_INT_MAX;
/** @var bool */
private $hasError = false;
/** @var SchedulerInterface */
private $scheduler;
public function __construct(int $bufferSize = null, int $windowSize = null, SchedulerInterface $scheduler = null)
{
$bufferSize = $bufferSize ?? $this->maxSafeInt;
if ($bufferSize >= 0) {
$this->bufferSize = $bufferSize;
}
$windowSize = $windowSize ?? $this->maxSafeInt;
if ($windowSize >= 0) {
$this->windowSize = $windowSize;
}
$this->scheduler = $scheduler ?: Scheduler::getDefault();
}
protected function _subscribe(ObserverInterface $observer): DisposableInterface
{
$this->assertNotDisposed();
$so = new ScheduledObserver($this->scheduler, $observer);
$subscription = $this->createRemovableDisposable($this, $so);
$this->trim();
$this->observers[] = $so;
foreach ($this->queue as $item) {
$so->onNext($item['value']);
}
if ($this->hasError) {
$so->onError($this->exception);
} else {
if ($this->isStopped) {
$so->onCompleted();
}
}
$so->ensureActive();
return $subscription;
}
public function onNext($value)
{
$this->assertNotDisposed();
if ($this->isStopped) {
return;
}
$now = $this->scheduler->now();
$this->queue[] = ["interval" => $now, "value" => $value];
$this->trim();
/** @var ScheduledObserver $observer */
foreach ($this->observers as $observer) {
$observer->onNext($value);
$observer->ensureActive();
}
}
public function onCompleted()
{
$this->assertNotDisposed();
if ($this->isStopped) {
return;
}
$this->isStopped = true;
/** @var ScheduledObserver $observer */
foreach ($this->observers as $observer) {
$observer->onCompleted();
$observer->ensureActive();
}
$this->observers = [];
}
public function onError(\Throwable $exception)
{
$this->assertNotDisposed();
if ($this->isStopped) {
return;
}
$this->isStopped = true;
$this->exception = $exception;
$this->hasError = true;
$this->trim();
/** @var ScheduledObserver $observer */
foreach ($this->observers as $observer) {
$observer->onError($exception);
$observer->ensureActive();
}
$this->observers = [];
}
private function createRemovableDisposable($subject, $observer): DisposableInterface
{
return new CallbackDisposable(function () use ($observer, $subject) {
$observer->dispose();
if (!$subject->isDisposed()) {
array_splice($subject->observers, (int)array_search($observer, $subject->observers, true), 1);
}
});
}
private function trim()
{
if (count($this->queue) > $this->bufferSize) {
array_shift($this->queue);
}
if (null !== $this->scheduler) {
$now = $this->scheduler->now();
while (count($this->queue) > 0 && ($now - $this->queue[0]["interval"]) > $this->windowSize) {
array_shift($this->queue);
}
}
}
}