1 files changed, 95 insertions, 0 deletions
diff --git a/lib/classes/cache/Wrapper.php b/lib/classes/cache/Wrapper.php
new file mode 100644
index 0000000..4e6342c
--- /dev/null
+++ b/lib/classes/cache/Wrapper.php
@@ -0,0 +1,95 @@
+<?php
+
+namespace Studip\Cache;
+
+use Psr\Cache\CacheItemInterface;
+
+/**
+ * The cache wrapper wraps a memory cache around another cache. This should
+ * reduce the accesses to the actual cache.
+ *
+ * @author Jan-Hendrik Willms <tleilax+studip@gmail.com>
+ * @license GPL2 or any later version
+ * @since Stud.IP 5.4
+ */
+class Wrapper extends Cache
+{
+    protected Cache $actual_cache;
+    protected MemoryCache $memory_cache;
+
+    public function __construct(Cache $actual_cache)
+    {
+        $this->actual_cache = $actual_cache;
+        $this->memory_cache = new MemoryCache();
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function expire($arg)
+    {
+        $this->memory_cache->expire($arg);
+        $this->actual_cache->expire($arg);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function flush()
+    {
+        $this->memory_cache->flush();
+        $this->actual_cache->flush();
+    }
+
+    public static function getDisplayName(): string
+    {
+        return static::class;
+    }
+
+    public function getStats(): array
+    {
+        return $this->actual_cache->getStats();
+    }
+
+    public static function getConfig(): array
+    {
+        return [];
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getItem(string $key): CacheItemInterface
+    {
+        $cached = $this->memory_cache->getItem($key);
+        if ($cached->isHit()) {
+            return $cached;
+        }
+
+        $cached = $this->actual_cache->getItem($key);
+        if ($cached->isHit()) {
+            $this->memory_cache->save($cached);
+        }
+        return $cached;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function hasItem(string $key): bool
+    {
+        return $this->actual_cache->hasItem($key);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function save(CacheItemInterface $item): bool
+    {
+        if ($this->actual_cache->save($item)) {
+            return $this->memory_cache->save($item);
+        } else {
+            return false;
+        }
+    }
+}