first commit

2021-04-17 00:26:33 +02:00
commit 866c63cc63
813 changed files with 100696 additions and 0 deletions
--- a/Classes/System/Cache/TwoLevelCache.php
+++ b/Classes/System/Cache/TwoLevelCache.php
@@ -0,0 +1,138 @@
+<?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();
+    }
+}