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<?php
namespace React\Promise;
class CancellationQueue
{
private $started = false;
private $queue = [];
public function __invoke()
{
if ($this->started) {
return;
}
$this->started = true;
$this->drain();
}
public function enqueue($cancellable)
{
if (!\is_object($cancellable) || !\method_exists($cancellable, 'then') || !\method_exists($cancellable, 'cancel')) {
return;
}
$length = \array_push($this->queue, $cancellable);
if ($this->started && 1 === $length) {
$this->drain();
}
}
private function drain()
{
for ($i = key($this->queue); isset($this->queue[$i]); $i++) {
$cancellable = $this->queue[$i];
$exception = null;
try {
$cancellable->cancel();
} catch (\Throwable $exception) {
} catch (\Exception $exception) {
}
unset($this->queue[$i]);
if ($exception) {
throw $exception;
}
}
$this->queue = [];
}
}