meilisearch/Classes/System/Cache/TwoLevelCache.php

139 lines
3.9 KiB
PHP
Raw Normal View History

2021-04-17 00:26:33 +02:00
<?php
namespace WapplerSystems\Meilisearch\System\Cache;
/***************************************************************
* Copyright notice
*
* (c) 2016 Timo Schmidt <timo.schmidt@dkd.de>
* All rights reserved
*
* This script is part of the TYPO3 project. The TYPO3 project is
* free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* The GNU General Public License can be found at
* http://www.gnu.org/copyleft/gpl.html.
* A copy is found in the textfile GPL.txt and important notices to the license
* from the author is found in LICENSE.txt distributed with these scripts.
*
*
* This script is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* This copyright notice MUST APPEAR in all copies of the script!
***************************************************************/
use TYPO3\CMS\Core\Cache\CacheManager;
use TYPO3\CMS\Core\Utility\GeneralUtility;
/**
* Provides a two level cache that uses an in memory cache as the first level cache and
* the TYPO3 caching framework cache as the second level cache.
*
* @author Timo Schmidt <timo.schmidt@dkd.de>
*/
class TwoLevelCache
{
/**
* @var string
*/
protected $cacheName = '';
/**
* @var array
*/
protected static $firstLevelCache = [];
/**
* @var \TYPO3\CMS\Core\Cache\Frontend\FrontendInterface
*/
protected $secondLevelCache = null;
/**
* @param string $cacheName
* @param \TYPO3\CMS\Core\Cache\Frontend\FrontendInterface $secondaryCacheFrontend
*/
public function __construct($cacheName, $secondaryCacheFrontend = null)
{
$this->cacheName = $cacheName;
if ($secondaryCacheFrontend == null) {
$cacheManager = GeneralUtility::makeInstance(CacheManager::class);
$this->secondLevelCache = $cacheManager->getCache($cacheName);
} else {
$this->secondLevelCache = $secondaryCacheFrontend;
}
}
/**
* Retrieves a value from the first level cache.
*
* @param string $cacheId
* @return mixed|null
*/
protected function getFromFirstLevelCache($cacheId)
{
if (!empty(self::$firstLevelCache[$this->cacheName][$cacheId])) {
return self::$firstLevelCache[$this->cacheName][$cacheId];
}
return null;
}
/**
* Write a value to the first level cache.
*
* @param string $cacheId
* @param mixed $value
*/
protected function setToFirstLevelCache($cacheId, $value)
{
self::$firstLevelCache[$this->cacheName][$cacheId] = $value;
}
/**
* Retrieves a value from the first level cache if present and
* from the second level if not.
*
* @param string $cacheId
* @return mixed
*/
public function get($cacheId)
{
$firstLevelResult = $this->getFromFirstLevelCache($cacheId);
if ($firstLevelResult !== null) {
return $firstLevelResult;
}
$secondLevelResult = $this->secondLevelCache->get($cacheId);
$this->setToFirstLevelCache($cacheId, $secondLevelResult);
return $secondLevelResult;
}
/**
* Write a value to the first and second level cache.
*
* @param string $cacheId
* @param mixed $value
*/
public function set($cacheId, $value)
{
$this->setToFirstLevelCache($cacheId, $value);
$this->secondLevelCache->set($cacheId, $value);
}
/**
* @return void
*/
public function flush()
{
self::$firstLevelCache[$this->cacheName] = [];
$this->secondLevelCache->flush();
}
}