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/TXCache.php')
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 @@
+
+ * @link http://www.pradosoft.com/
+ * @copyright Copyright © 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,
+ *
+ * $cache=new TXCache; // TXCache may also be loaded as a Prado application module
+ * $cache->init(null);
+ * $cache->add('object',$object);
+ * $object2=$cache->get('object');
+ *
+ *
+ * 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
+ *
+ *
+ *
+ *
+ * @author Wei Zhuo
+ * @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
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