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<?php |
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/* |
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* This file is part of the Concurrency Limit package. |
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* |
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* (c) Bogdan Koval' <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types = 1); |
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namespace Bogkov\ConcurrencyLimit; |
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use Bogkov\ConcurrencyLimit\Exception\LessThanMinimumException; |
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use Bogkov\ConcurrencyLimit\Exception\SaveException; |
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use Bogkov\ConcurrencyLimit\Provider\ProviderInterface; |
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/** |
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* Class Handler |
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* |
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* @package Bogkov\ConcurrencyLimit |
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*/ |
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class Handler |
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{ |
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const MINIMUM_VALUE = 0; |
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/** |
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* @var ProviderInterface |
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*/ |
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protected $provider; |
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/** |
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* Handler constructor. |
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* |
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* @param ProviderInterface $provider provider |
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*/ |
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public function __construct(ProviderInterface $provider) |
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{ |
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$this->provider = $provider; |
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} |
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/** |
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* @param string $key key |
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* @param int $limit limit |
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* |
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* @return bool |
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*/ |
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public function start(string $key, int $limit): bool |
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{ |
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$value = $this->provider->fetch($key) ?? static::MINIMUM_VALUE; |
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if ($limit <= $value) { |
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return false; |
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} |
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$this->save($key, ++$value); |
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return true; |
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} |
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/** |
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* @param string $key key |
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* |
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* @return void |
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*/ |
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public function end(string $key)/*: void*/ |
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{ |
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$value = $this->provider->fetch($key); |
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if (null === $value) { |
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return; |
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} |
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$this->save($key, --$value); |
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} |
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/** |
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* @param string $key key |
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* @param int $value value |
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* |
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* @throws LessThanMinimumException |
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* @throws SaveException |
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* |
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* @return void |
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*/ |
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protected function save(string $key, int $value)/*: void*/ |
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{ |
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if (static::MINIMUM_VALUE > $value) { |
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throw new LessThanMinimumException( |
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'Value ' . $value . ' less than minimum ' . static::MINIMUM_VALUE . ' by "' . $key . '"' |
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); |
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} |
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if (false === $this->provider->save($key, $value)) { |
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throw new SaveException('Failed save concurrent limit by "' . $key . '" with value ' . $value); |
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} |
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} |
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} |
bogkov /
concurrency-limit
