139 lines
3.9 KiB
PHP
139 lines
3.9 KiB
PHP
<?php
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namespace WapplerSystems\Meilisearch\System\Cache;
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/***************************************************************
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* Copyright notice
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*
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* (c) 2016 Timo Schmidt <timo.schmidt@dkd.de>
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* All rights reserved
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*
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* This script is part of the TYPO3 project. The TYPO3 project is
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* free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* The GNU General Public License can be found at
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* http://www.gnu.org/copyleft/gpl.html.
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* A copy is found in the textfile GPL.txt and important notices to the license
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* from the author is found in LICENSE.txt distributed with these scripts.
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*
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*
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* This script is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* This copyright notice MUST APPEAR in all copies of the script!
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***************************************************************/
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use TYPO3\CMS\Core\Cache\CacheManager;
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use TYPO3\CMS\Core\Utility\GeneralUtility;
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/**
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* Provides a two level cache that uses an in memory cache as the first level cache and
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* the TYPO3 caching framework cache as the second level cache.
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*
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* @author Timo Schmidt <timo.schmidt@dkd.de>
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*/
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class TwoLevelCache
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{
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/**
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* @var string
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*/
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protected $cacheName = '';
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/**
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* @var array
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*/
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protected static $firstLevelCache = [];
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/**
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* @var \TYPO3\CMS\Core\Cache\Frontend\FrontendInterface
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*/
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protected $secondLevelCache = null;
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/**
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* @param string $cacheName
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* @param \TYPO3\CMS\Core\Cache\Frontend\FrontendInterface $secondaryCacheFrontend
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*/
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public function __construct($cacheName, $secondaryCacheFrontend = null)
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{
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$this->cacheName = $cacheName;
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if ($secondaryCacheFrontend == null) {
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$cacheManager = GeneralUtility::makeInstance(CacheManager::class);
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$this->secondLevelCache = $cacheManager->getCache($cacheName);
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} else {
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$this->secondLevelCache = $secondaryCacheFrontend;
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}
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}
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/**
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* Retrieves a value from the first level cache.
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*
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* @param string $cacheId
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* @return mixed|null
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*/
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protected function getFromFirstLevelCache($cacheId)
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{
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if (!empty(self::$firstLevelCache[$this->cacheName][$cacheId])) {
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return self::$firstLevelCache[$this->cacheName][$cacheId];
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}
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return null;
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}
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/**
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* Write a value to the first level cache.
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*
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* @param string $cacheId
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* @param mixed $value
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*/
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protected function setToFirstLevelCache($cacheId, $value)
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{
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self::$firstLevelCache[$this->cacheName][$cacheId] = $value;
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}
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/**
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* Retrieves a value from the first level cache if present and
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* from the second level if not.
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*
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* @param string $cacheId
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* @return mixed
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*/
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public function get($cacheId)
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{
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$firstLevelResult = $this->getFromFirstLevelCache($cacheId);
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if ($firstLevelResult !== null) {
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return $firstLevelResult;
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}
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$secondLevelResult = $this->secondLevelCache->get($cacheId);
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$this->setToFirstLevelCache($cacheId, $secondLevelResult);
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return $secondLevelResult;
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}
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/**
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* Write a value to the first and second level cache.
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*
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* @param string $cacheId
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* @param mixed $value
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*/
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public function set($cacheId, $value)
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{
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$this->setToFirstLevelCache($cacheId, $value);
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$this->secondLevelCache->set($cacheId, $value);
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}
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/**
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* @return void
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*/
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public function flush()
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{
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self::$firstLevelCache[$this->cacheName] = [];
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$this->secondLevelCache->flush();
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}
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}
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