/**
* {@inheritdoc}
*/
public function isValid() : \Generator
{
while (null !== $this->awaitable) {
(yield $this->awaitable);
// Wait until last call has resolved.
}
if (null !== $this->placeholder) {
$this->placeholder->ready();
}
try {
$this->placeholder = $this->queue->pull();
$this->current = (yield $this->awaitable = $this->placeholder->getAwaitable());
} catch (\Throwable $exception) {
$this->current = $exception;
throw $exception;
} finally {
$this->complete = $this->queue->isComplete();
$this->awaitable = null;
}
return !$this->complete;
}
/**
* {@inheritdoc}
*/
public function isComplete() : bool
{
return $this->queue->isComplete();
}
