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


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<?php

declare(strict_types=1);

namespace OpenTelemetry\SDK\Common\Future;

use Closure;

final class NullCancellation implements CancellationInterface
{
    public function subscribe(Closure $callback): string
    {
        return self::class;
    }

    public function unsubscribe(string $id): void
    {
        // no-op
    }
}