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<?php declare(strict_types=1); |
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namespace WyriHaximus\Rx; |
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use React\Promise\Deferred; |
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use React\Promise\PromiseInterface; |
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use function React\Promise\reject; |
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use function React\Promise\resolve; |
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use Rx\ObservableInterface; |
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use Throwable; |
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final class ObservableWhile |
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{ |
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/** |
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* @var \SplQueue |
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*/ |
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private $queue; |
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/** |
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* @var Deferred |
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*/ |
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private $deferred; |
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/** |
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* @var bool |
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*/ |
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private $done = false; |
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/** |
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* @param ObservableInterface $observable |
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*/ |
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public function __construct(ObservableInterface $observable) |
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{ |
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$this->queue = new \SplQueue(); |
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$observable->subscribe(function ($item): void { |
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if ($this->deferred instanceof Deferred) { |
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$deferred = $this->deferred; |
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$this->deferred = null; |
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$deferred->resolve($item); |
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return; |
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} |
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$this->queue->enqueue($item); |
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}, function (Throwable $error): void { |
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if ($this->deferred instanceof Deferred) { |
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$deferred = $this->deferred; |
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$this->deferred = null; |
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$deferred->reject($error); |
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return; |
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} |
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$this->queue->enqueue($error); |
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}, function (): void { |
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$this->done = true; |
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if ($this->deferred instanceof Deferred) { |
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$this->deferred->resolve(); |
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$this->deferred = null; |
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} |
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}); |
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} |
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public function get(): PromiseInterface |
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{ |
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if ($this->queue->count() === 0 && $this->done === true) { |
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return resolve(); |
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} |
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if ($this->queue->count() === 0) { |
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$this->deferred = new Deferred(); |
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return $this->deferred->promise(); |
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} |
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$object = $this->queue->dequeue(); |
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if ($object instanceof Throwable) { |
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return reject($object); |
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} |
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return resolve($object); |
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} |
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} |
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WyriHaximus /
php-rxphp-recoilphp-looper
