diff options
| author | wei <> | 2007-10-08 03:24:07 +0000 |
|---|---|---|
| committer | wei <> | 2007-10-08 03:24:07 +0000 |
| commit | 4ceba82b9863f2c6323cbe00407e4bfbedbfc1cd (patch) | |
| tree | bc93498b5bf77b25c5a2d5a87ffaa4f8a9b70728 /framework/Caching/TXCache.php | |
| parent | aedbfe04daaaa0baa8e97c4d7d13e8a1f9d867cb (diff) | |
Allow active records to have multiple foreign key references to the same table. Add TXCache.
Diffstat (limited to 'framework/Caching/TXCache.php')
| -rw-r--r-- | framework/Caching/TXCache.php | 126 |
1 files changed, 126 insertions, 0 deletions
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 © 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();
+ }
+}
+
+?>
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