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<?php namespace GuzzleHttp\Promise; /** * A promise that has been fulfilled. * * Thenning off of this promise will invoke the onFulfilled callback * immediately and ignore other callbacks. */ class FulfilledPromise implements PromiseInterface { private $value; /** @var Promise|null */ private $promise; /** @var callable|null */ private $onFulfilled; public function __construct($value) { if (is_object($value) && method_exists($value, 'then')) { throw new \InvalidArgumentException( 'You cannot create a FulfilledPromise with a promise.' ); } $this->value = $value; } public function then( callable $onFulfilled = null, callable $onRejected = null ) { // Return itself if there is no onFulfilled function. if (!$onFulfilled) { return $this; } $this->onFulfilled = $onFulfilled; $queue = Utils::queue(); $p = $this->promise = new Promise([$queue, 'run']); $value = $this->value; $queue->add(static function () use ($p, $value, $onFulfilled) { if (Is::pending($p)) { self::callHandler($p, $value, $onFulfilled); } }); return $p; } public function otherwise(callable $onRejected) { return $this->then(null, $onRejected); } public function wait($unwrap = true, $defaultDelivery = null) { // Don't run the queue to avoid deadlocks, instead directly resolve the promise. if ($this->promise && Is::pending($this->promise)) { self::callHandler($this->promise, $this->value, $this->onFulfilled); } return $unwrap ? $this->value : null; } public function getState() { return self::FULFILLED; } public function resolve($value) { if ($value !== $this->value) { throw new \LogicException("Cannot resolve a fulfilled promise"); } } public function reject($reason) { throw new \LogicException("Cannot reject a fulfilled promise"); } public function cancel() { // pass } private static function callHandler(Promise $promise, $value, callable $handler) { try { $promise->resolve($handler($value)); } catch (\Throwable $e) { $promise->reject($e); } catch (\Exception $e) { $promise->reject($e); } } }