/**
* Add behavior for when the promise is resolved or rejected.
*
* If you do not care about one of the cases, you can set the corresponding callable to null
* The callback will be called when the response or exception arrived and never more than once.
*
* @param callable $onFulfilled Called when a response will be available.
* @param callable $onRejected Called when an error happens.
*
* You must always return the Response in the interface or throw an Exception.
*
* @return Promise Always returns a new promise which is resolved with value of the executed
* callback (onFulfilled / onRejected).
*/
public function then(callable $onFulfilled = null, callable $onRejected = null)
{
if ($onFulfilled) {
$this->core->addOnFulfilled($onFulfilled);
}
if ($onRejected) {
$this->core->addOnRejected($onRejected);
}
return new self($this->core, $this->runner);
}
