From 4ceba82b9863f2c6323cbe00407e4bfbedbfc1cd Mon Sep 17 00:00:00 2001
From: wei <>
Date: Mon, 8 Oct 2007 03:24:07 +0000
Subject: Allow active records to have multiple foreign key references to the
 same table. Add TXCache.

---
 framework/Caching/TXCache.php | 126 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 framework/Caching/TXCache.php

(limited to 'framework/Caching')

diff --git a/framework/Caching/TXCache.php b/framework/Caching/TXCache.php
new file mode 100644
index 00000000..698020af
--- /dev/null
+++ b/framework/Caching/TXCache.php
@@ -0,0 +1,126 @@
+<?php
+/**
+ * TXCache class file
+ *
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @link http://www.pradosoft.com/
+ * @copyright Copyright &copy; 2007 PradoSoft
+ * @license http://www.pradosoft.com/license/
+ * @version $Id: TXCache.php 1994 2007-06-11 16:02:28Z knut $
+ * @package System.Caching
+ */
+
+/**
+ * TXCache class
+ *
+ * TXCache implements a cache application module based on {@link http://xcache.lighttpd.net/ xcache}.
+ *
+ * By definition, cache does not ensure the existence of a value
+ * even if it never expires. Cache is not meant to be an persistent storage.
+ *
+ * To use this module, the xcache PHP extension must be loaded and configured in the php.ini.
+ *
+ * Some usage examples of TXCache are as follows,
+ * <code>
+ * $cache=new TXCache;  // TXCache may also be loaded as a Prado application module
+ * $cache->init(null);
+ * $cache->add('object',$object);
+ * $object2=$cache->get('object');
+ * </code>
+ *
+ * If loaded, TXCache will register itself with {@link TApplication} as the
+ * cache module. It can be accessed via {@link TApplication::getCache()}.
+ *
+ * TXCache may be configured in application configuration file as follows
+ * <code>
+ * <module id="cache" class="System.Caching.TXCache" />
+ * </code>
+ *
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @version $Id: TXCache.php 1994 2007-06-11 16:02:28Z knut $
+ * @package System.Caching
+ * @since 3.1.1
+ */
+class TXCache extends TCache
+{
+   /**
+    * Initializes this module.
+    * This method is required by the IModule interface.
+    * @param TXmlElement configuration for this module, can be null
+    * @throws TConfigurationException if xcache extension is not installed or not started, check your php.ini
+    */
+	public function init($config)
+	{
+		if(!function_exists('xcache_isset'))
+			throw new TConfigurationException('xcache_extension_required');
+
+		$enabled = intval(ini_get('xcache.cacher')) !== 0;
+		$var_size = intval(ini_get('xcache.var_size'));
+
+		if(!($enabled && $var_size > 0))
+			throw new TConfigurationException('xcache_extension_not_enabled');
+
+		parent::init($config);
+	}
+
+	/**
+	 * Retrieves a value from cache with a specified key.
+	 * This is the implementation of the method declared in the parent class.
+	 * @param string a unique key identifying the cached value
+	 * @return string the value stored in cache, false if the value is not in the cache or expired.
+	 */
+	protected function getValue($key)
+	{
+		return xcache_isset($key) ? xcache_get($key) : false;
+	}
+
+	/**
+	 * Stores a value identified by a key in cache.
+	 * This is the implementation of the method declared in the parent class.
+	 *
+	 * @param string the key identifying the value to be cached
+	 * @param string the value to be cached
+	 * @param integer the number of seconds in which the cached value will expire. 0 means never expire.
+	 * @return boolean true if the value is successfully stored into cache, false otherwise
+	 */
+	protected function setValue($key,$value,$expire)
+	{
+		return xcache_set($key,$value,$expire);
+	}
+
+	/**
+	 * Stores a value identified by a key into cache if the cache does not contain this key.
+	 * This is the implementation of the method declared in the parent class.
+	 *
+	 * @param string the key identifying the value to be cached
+	 * @param string the value to be cached
+	 * @param integer the number of seconds in which the cached value will expire. 0 means never expire.
+	 * @return boolean true if the value is successfully stored into cache, false otherwise
+	 */
+	protected function addValue($key,$value,$expire)
+	{
+		return !xcache_isset($key) ? $this->setValue($key,$value,$expire) : false;
+	}
+
+	/**
+	 * Deletes a value with the specified key from cache
+	 * This is the implementation of the method declared in the parent class.
+	 * @param string the key of the value to be deleted
+	 * @return boolean if no error happens during deletion
+	 */
+	protected function deleteValue($key)
+	{
+		return xcache_unset($key);
+	}
+
+	/**
+	 * Deletes all values from cache.
+	 * Be careful of performing this operation if the cache is shared by multiple applications.
+	 */
+	public function flush()
+	{
+		return xcache_clear_cache();
+	}
+}
+
+?>
\ No newline at end of file
-- 
cgit v1.2.3