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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);
}
}
}