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name : Key.php
 <?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Lock;

use Symfony\Component\Lock\Exception\UnserializableKeyException;

/**
 * Key is a container for the state of the locks in stores.
 *
 * @author Jérémy Derussé <jeremy@derusse.com>
 */
final class Key
{
    private string $resource;
    private ?float $expiringTime = null;
    private array $state = [];
    private bool $serializable = true;

    public function __construct(string $resource)
    {
        $this->resource = $resource;
    }

    public function __toString(): string
    {
        return $this->resource;
    }

    public function hasState(string $stateKey): bool
    {
        return isset($this->state[$stateKey]);
    }

    public function setState(string $stateKey, mixed $state): void
    {
        $this->state[$stateKey] = $state;
    }

    public function removeState(string $stateKey): void
    {
        unset($this->state[$stateKey]);
    }

    public function getState(string $stateKey): mixed
    {
        return $this->state[$stateKey];
    }

    public function markUnserializable(): void
    {
        $this->serializable = false;
    }

    public function resetLifetime(): void
    {
        $this->expiringTime = null;
    }

    /**
     * @param float $ttl the expiration delay of locks in seconds
     */
    public function reduceLifetime(float $ttl): void
    {
        $newTime = microtime(true) + $ttl;

        if (null === $this->expiringTime || $this->expiringTime > $newTime) {
            $this->expiringTime = $newTime;
        }
    }

    /**
     * Returns the remaining lifetime in seconds.
     */
    public function getRemainingLifetime(): ?float
    {
        return null === $this->expiringTime ? null : $this->expiringTime - microtime(true);
    }

    public function isExpired(): bool
    {
        return null !== $this->expiringTime && $this->expiringTime <= microtime(true);
    }

    public function __sleep(): array
    {
        if (!$this->serializable) {
            throw new UnserializableKeyException('The key cannot be serialized.');
        }

        return ['resource', 'expiringTime', 'state'];
    }
}
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