--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cake/libs/cache/xcache.php	Sun Jul 24 21:08:31 2011 +0900
@@ -0,0 +1,183 @@
+<?php
+/**
+ * Xcache storage engine for cache.
+ *
+ * PHP versions 4 and 5
+ *
+ * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
+ * Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright     Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
+ * @link          http://cakephp.org CakePHP(tm) Project
+ * @package       cake
+ * @subpackage    cake.cake.libs.cache
+ * @since         CakePHP(tm) v 1.2.0.4947
+ * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
+ */
+
+/**
+ * Xcache storage engine for cache
+ *
+ * @link          http://trac.lighttpd.net/xcache/ Xcache
+ * @package       cake
+ * @subpackage    cake.cake.libs.cache
+ */
+class XcacheEngine extends CacheEngine {
+
+/**
+ * Settings
+ *
+ *  - PHP_AUTH_USER = xcache.admin.user, default cake
+ *  - PHP_AUTH_PW = xcache.admin.password, default cake
+ *
+ * @var array
+ * @access public
+ */
+	var $settings = array();
+
+/**
+ * Initialize the Cache Engine
+ *
+ * Called automatically by the cache frontend
+ * To reinitialize the settings call Cache::engine('EngineName', [optional] settings = array());
+ *
+ * @param array $setting array of setting for the engine
+ * @return boolean True if the engine has been successfully initialized, false if not
+ * @access public
+ */
+	function init($settings) {
+		parent::init(array_merge(array(
+			'engine' => 'Xcache', 'prefix' => Inflector::slug(APP_DIR) . '_', 'PHP_AUTH_USER' => 'user', 'PHP_AUTH_PW' => 'password'
+			), $settings)
+		);
+		return function_exists('xcache_info');
+	}
+
+/**
+ * Write data for key into cache
+ *
+ * @param string $key Identifier for the data
+ * @param mixed $value Data to be cached
+ * @param integer $duration How long to cache the data, in seconds
+ * @return boolean True if the data was succesfully cached, false on failure
+ * @access public
+ */
+	function write($key, &$value, $duration) {
+		$expires = time() + $duration;
+		xcache_set($key . '_expires', $expires, $duration);
+		return xcache_set($key, $value, $duration);
+	}
+
+/**
+ * Read a key from the cache
+ *
+ * @param string $key Identifier for the data
+ * @return mixed The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it
+ * @access public
+ */
+	function read($key) {
+		if (xcache_isset($key)) {
+			$time = time();
+			$cachetime = intval(xcache_get($key . '_expires'));
+			if ($cachetime < $time || ($time + $this->settings['duration']) < $cachetime) {
+				return false;
+			}
+			return xcache_get($key);
+		}
+		return false;
+	}
+
+/**
+ * Increments the value of an integer cached key
+ * If the cache key is not an integer it will be treated as 0
+ *
+ * @param string $key Identifier for the data
+ * @param integer $offset How much to increment
+ * @param integer $duration How long to cache the data, in seconds
+ * @return New incremented value, false otherwise
+ * @access public
+ */
+	function increment($key, $offset = 1) {
+		return xcache_inc($key, $offset);
+	}
+
+/**
+ * Decrements the value of an integer cached key.
+ * If the cache key is not an integer it will be treated as 0
+ *
+ * @param string $key Identifier for the data
+ * @param integer $offset How much to substract
+ * @param integer $duration How long to cache the data, in seconds
+ * @return New decremented value, false otherwise
+ * @access public
+ */
+	function decrement($key, $offset = 1) {
+		return xcache_dec($key, $offset);
+	}
+/**
+ * Delete a key from the cache
+ *
+ * @param string $key Identifier for the data
+ * @return boolean True if the value was succesfully deleted, false if it didn't exist or couldn't be removed
+ * @access public
+ */
+	function delete($key) {
+		return xcache_unset($key);
+	}
+
+/**
+ * Delete all keys from the cache
+ *
+ * @return boolean True if the cache was succesfully cleared, false otherwise
+ * @access public
+ */
+	function clear() {
+		$this->__auth();
+		$max = xcache_count(XC_TYPE_VAR);
+		for ($i = 0; $i < $max; $i++) {
+			xcache_clear_cache(XC_TYPE_VAR, $i);
+		}
+		$this->__auth(true);
+		return true;
+	}
+
+/**
+ * Populates and reverses $_SERVER authentication values
+ * Makes necessary changes (and reverting them back) in $_SERVER
+ *
+ * This has to be done because xcache_clear_cache() needs to pass Basic Http Auth
+ * (see xcache.admin configuration settings)
+ *
+ * @param boolean Revert changes
+ * @access private
+ */
+	function __auth($reverse = false) {
+		static $backup = array();
+		$keys = array('PHP_AUTH_USER' => 'user', 'PHP_AUTH_PW' => 'password');
+		foreach ($keys as $key => $setting) {
+			if ($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] = $value;
+				}
+				if (!empty($this->settings[$setting])) {
+					$_SERVER[$key] = $this->settings[$setting];
+				} else if (!empty($this->settings[$key])) {
+					$_SERVER[$key] = $this->settings[$key];
+				} else {
+					$_SERVER[$key] = $value;
+				}
+			}
+		}
+	}
+}