1 files changed, 67 insertions, 0 deletions
diff --git a/lib/classes/StudipMemoryCache.class.php b/lib/classes/StudipMemoryCache.class.php
new file mode 100644
index 0000000..3946b34
--- /dev/null
+++ b/lib/classes/StudipMemoryCache.class.php
@@ -0,0 +1,67 @@
+<?php
+/**
+ * The php memory implementation of the StudipCache interface.
+ *
+ * @author  Jan-Hendrik Willms <tleilax+studip@gmail.com>
+ * @license GPL2 or any later version
+ * @since   Stud.IP 5.0
+ */
+class StudipMemoryCache implements StudipCache
+{
+    protected $memory_cache = [];
+
+    /**
+     * Expires just a single key.
+     *
+     * @param  string  the key
+     */
+    public function expire($key)
+    {
+        unset($this->memory_cache[$key]);
+    }
+
+    /**
+     * Expire all items from the cache.
+     */
+    public function flush()
+    {
+        $this->memory_cache = [];
+    }
+
+    /**
+     * Reads just a single key from the cache.
+     *
+     * @param  string  the key
+     *
+     * @return mixed   the corresponding value
+     */
+    public function read($key)
+    {
+        if (!isset($this->memory_cache[$key])) {
+            return false;
+        }
+        if ($this->memory_cache[$key]['expires'] < time()) {
+            $this->expire($key);
+            return false;
+        }
+        return $this->memory_cache[$key]['data'];
+    }
+
+    /**
+     * Store data at the server.
+     *
+     * @param string   the item's key.
+     * @param mixed    the item's content (will be serialized if necessary).
+     * @param int      the item's expiry time in seconds. Defaults to 12h.
+     *
+     * @returns mixed  returns TRUE on success or FALSE on failure.
+     *
+     */
+    public function write($name, $content, $expire = self::DEFAULT_EXPIRATION)
+    {
+        $this->memory_cache[$name] = [
+            'expires' => time() + $expire,
+            'data'    => $content,
+        ];
+    }
+}