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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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/** |
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* Promise Deferred class. |
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* |
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* @author Karel Osorio Ramírez <[email protected]> |
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*/ |
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class PromiseDeferred extends AbstractPromise implements DeferredInterface |
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{ |
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/** |
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* @var DeferredInterface[] |
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*/ |
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private $deferreds = array(); |
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/** |
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* @var PromiseInterface |
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*/ |
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private $actual = null; |
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/** |
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* @param callable $onFulfilled |
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* @param callable $onRejected |
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* @param callable $onNotify |
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* |
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* @return PromiseInterface |
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*/ |
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public function then(callable $onFulfilled = null, callable $onRejected = null, callable $onNotify = null) |
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{ |
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if ($this->state()->equals(State::PENDING())) { |
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return $this->enqueue($onFulfilled, $onRejected, $onNotify)->promise(); |
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} |
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return $this->actual->then($onFulfilled, $onRejected, $onNotify); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function resolve($value = null) |
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{ |
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$this->changeState($value, true); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function reject($reason = null) |
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{ |
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$this->changeState($reason, false); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function notify($state = null) |
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{ |
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if ($this->state()->equals(State::PENDING())) { |
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foreach ($this->deferreds as $deferred) { |
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$deferred->notify($state); |
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} |
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} else { |
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throw new \LogicException(\sprintf('A %s promise cannot be notified', $this->state()->getValue())); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function state() |
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{ |
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return $this->actual !== null ? $this->actual->state() : State::PENDING(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function promise() |
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{ |
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return $this; |
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} |
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/** |
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* @param mixed $result |
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* @param bool $success |
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* |
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* @throws \LogicException |
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*/ |
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private function changeState($result, $success) |
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{ |
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if ($this->state()->equals(State::PENDING())) { |
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$this->actual = $success ? new FulfilledPromise($result) : new RejectedPromise($result); |
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while (!empty($this->deferreds)) { |
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/** @var \Cubiche\Core\Async\Promise\DeferredInterface $deferred */ |
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$deferred = array_shift($this->deferreds); |
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if ($success) { |
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$deferred->resolve($result); |
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} else { |
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$deferred->reject($result); |
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} |
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} |
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} else { |
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throw new \LogicException( |
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\sprintf('A %s promise cannot be %s', $this->state()->getValue(), $success ? 'resolved' : 'rejected') |
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); |
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} |
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} |
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/** |
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* @param callable $onFulfilled |
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* @param callable $onRejected |
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* @param callable $onNotify |
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* |
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* @return \Cubiche\Core\Async\Promise\DeferredProxy |
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*/ |
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private function enqueue(callable $onFulfilled = null, callable $onRejected = null, callable $onNotify = null) |
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{ |
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$deferred = new DeferredProxy(new Deferred(), $onFulfilled, $onRejected, $onNotify, false); |
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$this->deferreds[] = $deferred; |
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return $deferred; |
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} |
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} |
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cubiche /
async
