diff --git a/src/Pluf/Cache.php b/src/Pluf/Cache.php
index 4e2f39e..ab794ad 100644
--- a/src/Pluf/Cache.php
+++ b/src/Pluf/Cache.php
@@ -57,7 +57,10 @@ class Pluf_Cache
         if (false == ($engine = Pluf::f('cache_engine', false))) {
             throw new Pluf_Exception_SettingError('"cache_engine" setting not defined.');
         }
-        return new $engine();
+        if (!isset($GLOBALS['_PX_Pluf_Cache-'.$engine])) {
+            $GLOBALS['_PX_Pluf_Cache-'.$engine] = new $engine();
+        } 
+        return $GLOBALS['_PX_Pluf_Cache-'.$engine];
     }
 
     /**
diff --git a/src/Pluf/Cache/File.php b/src/Pluf/Cache/File.php
index e49b84b..d06b0ad 100644
--- a/src/Pluf/Cache/File.php
+++ b/src/Pluf/Cache/File.php
@@ -29,7 +29,7 @@
  */
 class Pluf_Cache_File extends Pluf_Cache
 {
-    public function __constructor()
+    public function __construct()
     {
         if (false == Pluf::f('cache_file_folder', false)) {
             throw new Pluf_Exception_SettingError('"cache_file_folder" setting not defined.');
diff --git a/src/Pluf/Cache/Memcached.php b/src/Pluf/Cache/Memcached.php
index 91adcfd..986e322 100644
--- a/src/Pluf/Cache/Memcached.php
+++ b/src/Pluf/Cache/Memcached.php
@@ -42,11 +42,11 @@ class Pluf_Cache_Memcached extends Pluf_Cache
     private $memcache = null;
     private $keyprefix = '';
 
-    public function __constructor()
+    public function __construct()
     {
         $this->memcache = memcache_connect(Pluf::f('cache_memcached_server', 'localhost'),
                                            Pluf::f('cache_memcached_port', 11211));
-        if (false == $this->memcache) {
+        if (false === $this->memcache) {
             $this->memcache = null;
         }
         $this->keyprefix = Pluf::f('cache_memcached_keyprefix', '');