public function then($onComplete, $onError = null)
{
if (!is_callable($onComplete)) {
$onComplete = null;
}
if (!is_callable($onError)) {
$onError = null;
}
if ($onComplete !== null || $onError !== null) {
if ($onComplete !== null && $this->status === Future::FULFILLED) {
$x = $this->result;
if ($x instanceof Future) {
if ($x === $this) {
throw new \Exception('Self resolution');
}
return $x->then($onComplete, $onError);
}
return Future::create($onComplete, $x);
}
if ($onError !== null && $this->status === Future::REJECTED) {
return Future::create($onError, $this->error);
}
$this->callbacks[] = array($onComplete, $onError);
}
return $this;
}
public function completeError($error)
{
if ($this->future->status === Future::PENDING) {
$this->future->status = Future::REJECTED;
$this->future->error = $error;
while (count($this->future->callbacks) > 0) {
$callback = array_shift($this->future->callbacks);
if ($callback[1] !== null) {
$result = Future::create($callback[1], $error);
break;
}
}
if (count($this->future->callbacks) > 0) {
do {
$callback = array_shift($this->future->callbacks);
$result = $this->resolve($callback[0], $callback[1], $result);
} while (count($this->future->callbacks) > 0);
}
}
}