Refactor Cache services

lib/Alchemy/Phrasea/Cache/ArrayCache.php

@@ -22,10 +22,35 @@ use Doctrine\Common\Cache\ArrayCache as DoctrineArray;
 class ArrayCache extends DoctrineArray implements Cache
 {
 
-  public function flushAll()
+  public function isServer()
   {
-    $this->data = array();
-    return true;
+
+    return false;
+  }
+
+  public function getStats()
+  {
+
+    return null;
+  }
+
+  public function get($id)
+  {
+    if (!$this->contains($id))
+    {
+      throw new Exception(sprintf('Unable to find key %s', $id));
+    }
+    return $this->fetch($id);
+  }
+
+  public function deleteMulti(array $array_keys)
+  {
+    foreach ($array_keys as $id)
+    {
+      $this->delete($id);
+    }
+
+    return;
   }
 
 }