vendor/open-telemetry/sdk/Common/Future/CancellationInterface.php


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<?php

declare(strict_types=1);

namespace OpenTelemetry\SDK\Common\Future;

use Closure;
use Throwable;

interface CancellationInterface
{
    /**
     * @param Closure(Throwable): void $callback
     */
    public function subscribe(Closure $callback): string;

    public function unsubscribe(string $id): void;
}