82 lines
1.9 KiB
PHP
82 lines
1.9 KiB
PHP
<?php
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/*
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* This file is part of Twig.
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*
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* (c) Fabien Potencier
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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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namespace Twig\Cache;
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/**
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* Chains several caches together.
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*
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* Cached items are fetched from the first cache having them in its data store.
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* They are saved and deleted in all adapters at once.
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*
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* @author Quentin Devos <quentin@devos.pm>
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*/
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final class ChainCache implements CacheInterface
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{
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private $caches;
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/**
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* @param iterable<CacheInterface> $caches The ordered list of caches used to store and fetch cached items
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*/
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public function __construct(iterable $caches)
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{
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$this->caches = $caches;
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}
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public function generateKey(string $name, string $className): string
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{
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return $className.'#'.$name;
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}
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public function write(string $key, string $content): void
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{
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$splitKey = $this->splitKey($key);
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foreach ($this->caches as $cache) {
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$cache->write($cache->generateKey(...$splitKey), $content);
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}
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}
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public function load(string $key): void
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{
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[$name, $className] = $this->splitKey($key);
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foreach ($this->caches as $cache) {
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$cache->load($cache->generateKey($name, $className));
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if (class_exists($className, false)) {
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break;
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}
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}
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}
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public function getTimestamp(string $key): int
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{
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$splitKey = $this->splitKey($key);
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foreach ($this->caches as $cache) {
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if (0 < $timestamp = $cache->getTimestamp($cache->generateKey(...$splitKey))) {
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return $timestamp;
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}
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}
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return 0;
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}
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/**
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* @return string[]
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*/
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private function splitKey(string $key): array
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{
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return array_reverse(explode('#', $key, 2));
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}
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}
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