Adding Xcache support http://trac.lighttpd.net/xcache/

git-svn-id: https://svn.cakephp.org/repo/branches/1.2.x.x@4947 3807eeeb-6ff5-0310-8944-8be069107fe0

app/config/core.php

@@ -178,6 +178,12 @@
  * APC (Alternative PHP Cache)
  * 	$cakeCache = array('APC');
  *
+ * Xcache (PHP opcode cacher)
+ *  $cakeCache  = array('Xcache', array(
+ *      'user' => 'admin', // user from xcache.admin.user settings
+ *      'password' => 'your_password', // plaintext password (xcache.admin.pass)
+ *  ));
+ *
  * Memcache
  * 	$cakeCache = array('Memcache', [optional]array(
  * 		'servers' => array(

cake/libs/cache/xcache.php

@@ -0,0 +1,147 @@
+<?php
+/* SVN FILE: $Id$ */
+/**
+ * Xcache storage engine for cache.
+ *
+ *
+ * PHP versions 4 and 5
+ *
+ * CakePHP(tm) :  Rapid Development Framework <http://www.cakephp.org/>
+ * Copyright 2005-2007, Cake Software Foundation, Inc.
+ *								1785 E. Sahara Avenue, Suite 490-204
+ *								Las Vegas, Nevada 89104
+ *
+ * Licensed under The MIT License
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @filesource
+ * @copyright		Copyright 2005-2007, Cake Software Foundation, Inc.
+ * @link				http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
+ * @package			cake
+ * @subpackage		cake.cake.libs.cache
+ * @since			CakePHP(tm) v 1.2.0.4947
+ * @version			$Revision$
+ * @modifiedby		$LastChangedBy$
+ * @lastmodified	$Date$
+ * @license			http://www.opensource.org/licenses/mit-license.php The MIT License
+ */
+/**
+ * Xcache storage engine for cache
+ *
+ * @package		cake
+ * @subpackage	cake.cake.libs.cache
+ */
+class XcacheEngine extends CacheEngine {
+/**
+ * Admin username (xcache.admin.user)
+ *
+ * @var string
+ */
+	var $_php_auth_user = '';
+/**
+ * Plaintext password for basic auth (xcache.admin.pass)
+ *
+ * @var string
+ */
+	var $_php_auth_pw = '';
+/**
+ * Set up the cache engine
+ *
+ * Called automatically by the cache frontend
+ *
+ * @param array $params	Associative array of parameters for the engine
+ * @return boolean	True if the engine has been succesfully initialized, false if not
+ */
+	function init($params) {
+		$this->_php_auth_user = $params['user'];
+		$this->_php_auth_pw = $params['password'];
+		return function_exists('xcache_info');
+	}
+/**
+ * Write a value in the cache
+ *
+ * @param string $key Identifier for the data
+ * @param mixed $value Data to be cached
+ * @param int $duration How long to cache the data, in seconds
+ * @return boolean True if the data was succesfully cached, false on failure
+ */
+	function write($key, &$value, $duration = CACHE_DEFAULT_DURATION) {
+		return xcache_set($key, $value, $duration);
+	}
+/**
+ * Read a value from the cache
+ *
+ * @param string $key Identifier for the data
+ * @return mixed The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it
+ */
+	function read($key) {
+		if(xcache_isset($key)) {
+			return xcache_get($key);
+		}
+		return false;
+	}
+/**
+ * Delete a value from the cache
+ *
+ * @param string $key Identifier for the data
+ * @return boolean True if the value was succesfully deleted, false if it didn't exist or couldn't be removed
+ */
+	function delete($key) {
+		return xcache_unset($key);
+	}
+/**
+ * Delete all values from the cache
+ *
+ * @return boolean True if the cache was succesfully cleared, false otherwise
+ */
+	function clear() {
+		$result = true;
+		$this->_phpAuth();
+
+		for($i = 0, $max = xcache_count(XC_TYPE_VAR); $i < $max; $i++) {
+			if(!xcache_clear_cache(XC_TYPE_VAR, $i)) {
+				$result = false;
+				break;
+			}
+		}
+		$this->_phpAuth(true);
+		return $result;
+	}
+/**
+ * Return the settings for this cache engine
+ *
+ * @return array list of settings for this engine
+ */
+	function settings() {
+		return array('class' => get_class($this));
+	}
+/**
+ * Makes necessary changes (and reverting them back) in $_SERVER
+ *
+ * This has to be done because xcache_clear_cache() needs pass Basic Auth
+ * (see xcache.admin configuration settings)
+ */
+	function _phpAuth($reverse = false) {
+		static $backup = array();
+		$keys = array('PHP_AUTH_USER', 'PHP_AUTH_PW');
+
+		foreach($keys as $key) {
+			if($reverse) {
+				if(isset($backup[$key])) {
+					$_SERVER[$key] = $backup[$key];
+					unset($backup[$key]);
+				} else {
+					unset($_SERVER[$key]);
+				}
+			} else {
+				$value = env($key);
+				if(!empty($value)) {
+					$backup[$key] = $value;
+				}
+				$varName = '_' . low($key);
+				$_SERVER[$key] = $this->{$varName};
+			}
+		}
+	}
+}
+?>