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<?php |
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declare(strict_types=1); |
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namespace RemotelyLiving\PHPCacheAdapter\SimpleCache; |
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use Psr\SimpleCache; |
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final class Memory extends AbstractAdapter |
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{ |
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private array $cache = []; |
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private ?int $maxItems; |
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private function __construct(int $maxItems = null) |
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{ |
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$this->maxItems = $maxItems; |
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} |
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public static function create(int $maxItems = null): SimpleCache\CacheInterface |
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{ |
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return new self($maxItems); |
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} |
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protected function flush(): bool |
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{ |
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$this->cache = []; |
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return empty($this->cache); |
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} |
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protected function exists(string $key): bool |
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{ |
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$this->expireEntries(); |
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return isset($this->cache[$key]); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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protected function multiGet(array $keys, $default = null): \Generator |
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{ |
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$this->expireEntries(); |
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foreach ($keys as $key) { |
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yield $key => $this->cache[$key]['value'] ?? $default; |
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} |
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} |
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protected function multiDelete(array $keys): bool |
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{ |
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$this->expireEntries(); |
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foreach ($keys as $key) { |
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unset($this->cache[$key]); |
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} |
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return true; |
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} |
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protected function multiSave(array $values, int $ttl = null): bool |
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{ |
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$this->expireEntries(); |
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$ttl = $ttl ?? $this->getDefaultTTLSeconds(); |
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foreach ($values as $key => $value) { |
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$this->cache[$key]['value'] = $value; |
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$this->cache[$key]['expiresAt'] = $this->getExpiresFromTTL($ttl); |
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if ($this->isAtEvictionThreshold()) { |
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$this->evict(); |
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; |
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} |
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} |
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return true; |
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} |
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protected function timestamp(): int |
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{ |
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return time(); |
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} |
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private function expireEntries(): void |
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{ |
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$time = $this->timestamp(); |
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foreach ($this->cache as $key => $entry) { |
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if ($entry['expiresAt'] === null || $entry['expiresAt'] > $time) { |
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continue; |
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} |
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unset($this->cache[$key]); |
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} |
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} |
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private function getExpiresFromTTL(?int $ttl): ?int |
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{ |
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if ($ttl === null) { |
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return null; |
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} |
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return $this->timestamp() + $ttl; |
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} |
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private function isAtEvictionThreshold(): bool |
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{ |
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if ($this->maxItems === null) { |
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return false; |
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} |
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return (count($this->cache) > $this->maxItems); |
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} |
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private function evict(): void |
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{ |
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array_shift($this->cache); |
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} |
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} |
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remotelyliving /
php-cache-adapter
