added APC caching driver

lib/Doctrine/Cache/Apc.php

+<?php
+/*
+ *  $Id$
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the LGPL. For more information, see
+ * <http://www.phpdoctrine.com>.
+ */
+
+/**
+ * Doctrine_Cache_Apc
+ *
+ * @package     Doctrine
+ * @subpackage  Doctrine_Cache
+ * @license     http://www.opensource.org/licenses/lgpl-license.php LGPL
+ * @category    Object Relational Mapping
+ * @link        www.phpdoctrine.com
+ * @since       1.0
+ * @version     $Revision$
+ * @author      Konsta Vesterinen <kvesteri@cc.hut.fi>
+ */
+class Doctrine_Cache_Apc extends Doctrine_Cache_Driver
+{
+    /**
+     * constructor
+     * 
+     * @param array $options    associative array of cache driver options
+     */
+    public function __construct($options = array())
+    {      
+        if ( ! extension_loaded('apc')) {
+            throw new Doctrine_Cache_Exception('The apc extension must be loaded for using this backend !');
+        }
+        parent::__construct($options);
+    }
+    /**
+     * Test if a cache is available for the given id and (if yes) return it (false else)
+     * 
+     * Note : return value is always "string" (unserialization is done by the core not by the backend)
+     * 
+     * @param string $id cache id
+     * @param boolean $testCacheValidity        if set to false, the cache validity won't be tested
+     * @return string cached datas (or false)
+     */
+    public function fetch($id, $testCacheValidity = true) 
+    {
+        $tmp = apc_fetch($id);
+        if (is_array($tmp)) {
+            return $tmp[0];
+        }
+        return false;
+    }
+    /**
+     * Test if a cache is available or not (for the given id)
+     *
+     * @param string $id cache id
+     * @return mixed false (a cache is not available) or "last modified" timestamp (int) of the available cache record
+     */
+    public function contains($id) 
+    {
+        $tmp = apc_fetch($id);
+        if (is_array($tmp)) {
+            return $tmp[1];
+        }
+        return false;
+    }
+    /**
+     * Save some string datas into a cache record
+     *
+     * Note : $data is always saved as a string
+     *
+     * @param string $data      data to cache
+     * @param string $id        cache id
+     * @param int $lifeTime     if != false, set a specific lifetime for this cache record (null => infinite lifeTime)
+     * @return boolean true if no problem
+     */
+    public function save($data, $id, $lifeTime = false)
+    {
+        $lifeTime = $this->getLifeTime($lifeTime);
+
+        return (bool) apc_store($id, array($data, time()), $lifeTime);
+    }
+    /**
+     * Remove a cache record
+     * 
+     * @param string $id cache id
+     * @return boolean true if no problem
+     */
+    public function delete($id) 
+    {
+        return apc_delete($id);
+    }
+}

lib/Doctrine/Cache/Sqlite.php

@@ -31,7 +31,7 @@
  * @version     $Revision$
  * @author      Konsta Vesterinen <kvesteri@cc.hut.fi>
  */
-class Doctrine_Cache_Sqlite implements Doctrine_Cache_Interface, Countable
+class Doctrine_Cache_Sqlite extends Doctrine_Cache_Driver implements Countable
 {
     /**
      * Test if a cache is available for the given id and (if yes) return it (false else)