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<?php |
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/* |
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* This file is part of the Cubiche package. |
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* |
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* Copyright (c) Cubiche |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Cubiche\Core\Async\Promise; |
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use Cubiche\Core\Async\Loop\LoopInterface; |
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/** |
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* Promises class. |
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* |
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* @author Karel Osorio Ramírez <[email protected]> |
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*/ |
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class Promises |
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{ |
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/** |
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* @return \Cubiche\Core\Async\Promise\DeferredInterface |
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*/ |
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public static function defer() |
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{ |
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return new Deferred(); |
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} |
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/** |
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* @param mixed $value |
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* |
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* @return \Cubiche\Core\Async\Promise\PromiseInterface |
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*/ |
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public static function fulfilled($value = null) |
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{ |
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return new FulfilledPromise($value); |
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} |
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/** |
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* @param mixed $reason |
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* |
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* @return \Cubiche\Core\Async\Promise\PromiseInterface |
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*/ |
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public static function rejected($reason = null) |
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{ |
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return new RejectedPromise($reason); |
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} |
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/** |
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* @param PromiseInterface[] $promises |
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* |
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* @return \Cubiche\Core\Async\Promise\PromiseInterface |
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*/ |
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public static function all($promises) |
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{ |
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return self::map($promises); |
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} |
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/** |
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* @param PromiseInterface[] $promises |
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* @param callable $map |
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* |
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* @return \Cubiche\Core\Async\Promise\PromiseInterface |
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*/ |
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public static function map($promises, callable $map = null) |
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{ |
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$pending = \count($promises); |
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if ($pending == 0) { |
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return self::fulfilled(array()); |
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} |
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$deferred = self::defer(); |
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$results = array(); |
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/** @var \Cubiche\Core\Async\Promise\PromiseInterface $promise */ |
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foreach ($promises as $key => $promise) { |
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$promise->then( |
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function ($value) use ($deferred, &$results, $map, $key, &$pending) { |
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if ($map !== null) { |
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$value = $map($value); |
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} |
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$results[$key] = $value; |
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if (--$pending == 0) { |
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$deferred->resolve($results); |
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} |
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}, |
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function ($reason) use ($deferred) { |
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$deferred->reject($reason); |
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} |
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); |
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} |
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return $deferred->promise(); |
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} |
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/** |
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* @param PromiseInterface $promise |
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* @param int|float $time |
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* @param LoopInterface $loop |
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* |
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* @return \Cubiche\Core\Async\Promise\PromiseInterface |
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*/ |
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public static function timeout(PromiseInterface $promise, $time, LoopInterface $loop) |
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{ |
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$deferred = self::defer(); |
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$timer = $loop->timeout(function () use ($promise, $deferred, $time) { |
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$deferred->reject(new TimeoutException($time)); |
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}, $time); |
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$promise->then(function ($value = null) use ($deferred, $timer) { |
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$timer->cancel(); |
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$deferred->resolve($value); |
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}, function ($reason = null) use ($deferred, $timer) { |
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$timer->cancel(); |
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$deferred->reject($reason); |
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}); |
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return $deferred->promise(); |
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} |
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/** |
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* @param PromiseInterface $promise |
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* @param LoopInterface $loop |
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* @param int|float $timeout |
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* |
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* @throws RejectionException |
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* |
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* @return mixed |
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*/ |
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public static function get(PromiseInterface $promise, LoopInterface $loop, $timeout = null) |
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{ |
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$result = null; |
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$rejectionReason = null; |
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if ($timeout !== null) { |
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$promise = self::timeout($promise, $timeout, $loop); |
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} |
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$promise->then(function ($value = null) use (&$result) { |
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$result = $value; |
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}, function ($reason = null) use (&$rejectionReason) { |
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$rejectionReason = $reason; |
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})->always(function () use ($loop) { |
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$loop->stop(); |
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}); |
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while ($promise->state()->equals(State::PENDING())) { |
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$loop->run(); |
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} |
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if ($promise->state()->equals(State::FULFILLED())) { |
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return $result; |
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} |
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throw new RejectionException($rejectionReason); |
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} |
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} |
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cubiche /
async
