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Mini Shell
<?php
namespace Amp;
final class CombinedCancellationToken implements CancellationToken
{
/** @var array{0: CancellationToken, 1: string}[] */
private $tokens = [];
/** @var string */
private $nextId = "a";
/** @var callable[] */
private $callbacks = [];
/** @var CancelledException|null */
private $exception;
public function __construct(CancellationToken ...$tokens)
{
$thatException = &$this->exception;
$thatCallbacks = &$this->callbacks;
foreach ($tokens as $token) {
$id = $token->subscribe(static function (CancelledException $exception) use (&$thatException, &$thatCallbacks) {
$thatException = $exception;
$callbacks = $thatCallbacks;
$thatCallbacks = [];
foreach ($callbacks as $callback) {
asyncCall($callback, $thatException);
}
});
$this->tokens[] = [$token, $id];
}
}
public function __destruct()
{
foreach ($this->tokens as list($token, $id)) {
/** @var CancellationToken $token */
$token->unsubscribe($id);
}
}
/** @inheritdoc */
public function subscribe(callable $callback): string
{
$id = $this->nextId++;
if ($this->exception) {
asyncCall($callback, $this->exception);
} else {
$this->callbacks[$id] = $callback;
}
return $id;
}
/** @inheritdoc */
public function unsubscribe(string $id)
{
unset($this->callbacks[$id]);
}
/** @inheritdoc */
public function isRequested(): bool
{
foreach ($this->tokens as list($token)) {
if ($token->isRequested()) {
return true;
}
}
return false;
}
/** @inheritdoc */
public function throwIfRequested()
{
foreach ($this->tokens as list($token)) {
$token->throwIfRequested();
}
}
}
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