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Editing: TimeoutCancellationToken.php

<?php

namespace Amp;

use function Amp\Internal\formatStacktrace;

/**
 * A TimeoutCancellationToken automatically requests cancellation after the timeout has elapsed.
 */
final class TimeoutCancellationToken implements CancellationToken
{
    /** @var string */
    private $watcher;

/** @var CancellationToken */
    private $token;

/**
     * @param int    $timeout Milliseconds until cancellation is requested.
     * @param string $message Message for TimeoutException. Default is "Operation timed out".
     */
    public function __construct(int $timeout, string $message = "Operation timed out")
    {
        $source = new CancellationTokenSource;
        $this->token = $source->getToken();

$trace = \debug_backtrace(\DEBUG_BACKTRACE_IGNORE_ARGS);
        $this->watcher = Loop::delay($timeout, static function () use ($source, $message, $trace) {
            $trace = formatStacktrace($trace);
            $source->cancel(new TimeoutException("$message\r\nTimeoutCancellationToken was created here:\r\n$trace"));
        });

Loop::unreference($this->watcher);
    }

/**
     * Cancels the delay watcher.
     */
    public function __destruct()
    {
        Loop::cancel($this->watcher);
    }

/**
     * {@inheritdoc}
     */
    public function subscribe(callable $callback): string
    {
        return $this->token->subscribe($callback);
    }

/**
     * {@inheritdoc}
     */
    public function unsubscribe(string $id)
    {
        $this->token->unsubscribe($id);
    }

/**
     * {@inheritdoc}
     */
    public function isRequested(): bool
    {
        return $this->token->isRequested();
    }

/**
     * {@inheritdoc}
     */
    public function throwIfRequested()
    {
        $this->token->throwIfRequested();
    }
}

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