added cache interface

lib/Doctrine/Cache/Interface.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_Interface
+ *
+ * @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>
+ */
+interface Doctrine_Cache_Interface 
+{
+    /**
+     * 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);
+
+    /**
+     * 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);
+
+    /**
+     * 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, $tags = array(), $lifeTime = false);
+
+    /**
+     * Remove a cache record
+     * 
+     * @param string $id cache id
+     * @return boolean true if no problem
+     */
+    public function delete($id);
+}