Moved caching methods out of functions.inc.php into ContentCache class.

lib/Serendipity/ContentCache.php

@@ -0,0 +1,76 @@
+<?php
+
+// Serendipity
+// See LICENSE file for license information.
+
+namespace Serendipity;
+
+use voku\cache\Cache;
+use voku\cache\CacheAdapterAutoManager;
+use voku\cache\AdapterArray;
+use voku\cache\AdapterOpCache;
+
+class ContentCache
+{
+    protected static $instance = null;
+    protected $cache_manager;
+    protected $cache;
+
+    public static function getInstance()
+    {
+        if (self::$instance === null) {
+            self::$instance = new self();
+        }
+        return self::$instance;
+    }
+    
+    private function __construct()
+    {
+        // Configure voku/simple-cache to use templates_c as directory for the opcache files, the fallback
+        // when Memcached and Redis are not used.
+        // FIXME: Bad hack - remove when no longer needed!
+        global $serendipity;
+        $cacheDir = $serendipity['serendipityPath'] . '/templates_c/simple_cache';
+
+        $this->cache_manager = new CacheAdapterAutoManager();
+        $this->cache_manager->addAdapter(
+            AdapterOpCache::class,
+            static function () use ($cacheDir) {
+                return $cacheDir;
+            }
+        );
+
+        $this->cache_manager->addAdapter(
+            AdapterArray::class
+        );
+
+        $this->cache = new Cache(
+            null,
+            null,
+            false,
+            true,
+            false,
+            false,
+            false,
+            false,
+            '',
+            $this->cache_manager,
+            false
+        );
+    }
+
+    public function addItem($key, $item, $ttl = 3600)
+    {
+        return $this->cache->setItem($key, $item, $ttl);
+    }
+    
+    public function getItem($key)
+    {
+        return $this->cache->getItem($key);
+    }
+    
+    public function clearCache()
+    {
+        return $this->cache->removeAll();
+    }
+}