public static function resolve($value, Promise $promise = null)
{
if ($value === $promise) {
throw new \InvalidArgumentException('$promise === $value');
}
if ($value instanceof Promise) {
return $value;
} else {
if ($promise === null) {
$promise = new Promise();
}
if (is_object($value) && method_exists($value, 'then')) {
try {
$value->then(function ($value) use($promise) {
Promise::resolve($value, $promise);
}, [$promise, 'reject']);
} catch (\Exception $e) {
if ($promise->getState() === 'pending') {
$promise->reject($e);
}
}
} else {
$promise->fulfill($value);
}
return $promise;
}
}
protected function postResolveTask(Promise &$child, callable $callback, $value)
{
$this->tasks->enqueue(function () use(&$child, $callback, $value) {
try {
$child = Promise::resolve($callback($value), $child);
} catch (\Exception $e) {
$child->reject($e);
}
});
}