From b558f2c60e97540415464719149b773e51f79abc Mon Sep 17 00:00:00 2001 From: xue <> Date: Mon, 17 Sep 2007 18:18:17 +0000 Subject: Added TCachePageStatePersister --- framework/Web/UI/TCachePageStatePersister.php | 202 ++++++++++++++++++++++++ framework/Web/UI/TSessionPageStatePersister.php | 4 +- 2 files changed, 204 insertions(+), 2 deletions(-) create mode 100644 framework/Web/UI/TCachePageStatePersister.php (limited to 'framework/Web/UI') diff --git a/framework/Web/UI/TCachePageStatePersister.php b/framework/Web/UI/TCachePageStatePersister.php new file mode 100644 index 00000000..3e793195 --- /dev/null +++ b/framework/Web/UI/TCachePageStatePersister.php @@ -0,0 +1,202 @@ + + * @link http://www.pradosoft.com/ + * @copyright Copyright © 2005-2007 PradoSoft + * @license http://www.pradosoft.com/license/ + * @version $Id$ + * @package System.Web.UI + */ + +/** + * TCachePageStatePersister class + * + * TCachePageStatePersister implements a page state persistent method based on cache. + * Page state are stored in cache (e.g. memcache, DB cache, etc.), and only a small token + * is passed to the client side to identify the state. This greatly reduces the size of + * the page state that needs to be transmitted between the server and the client. Of course, + * this is at the cost of using server side resource. + * + * A cache module has to be loaded in order to use TCachePageStatePersister. + * By default, TCachePageStatePersister will use the primary cache module. + * A non-primary cache module can be used by setting {@link setCacheModuleID CacheModuleID}. + * Any cache module, as long as it implements the interface {@link ICache}, may be used. + * For example, one can use {@link TDbCache}, {@link TMemCache}, {@link TAPCCache}, etc. + * + * TCachePageStatePersister uses {@link setCacheTimeout CacheTimeout} to limit the data + * that stores in cache. + * + * Since server resource is often limited, be cautious if you plan to use TCachePageStatePersister + * for high-traffic Web pages. You may consider using a small {@link setCacheTimeout CacheTimeout}. + * + * There are a couple of ways to use TCachePageStatePersister. + * One can override the page's {@link TPage::getStatePersister()} method and + * create a TCachePageStatePersister instance there. + * Or one can configure the pages to use TCachePageStatePersister in page configurations + * as follows, + * + * + * + * Note in the above, we use StatePersister.CacheModuleID to configure the cache module ID + * for the TCachePageStatePersister instance. + * + * The above configuration will affect the pages under the directory containing + * this configuration and all its subdirectories. + * To configure individual pages to use TCachePageStatePersister, use + * + * + * + * + * + * + * @author Qiang Xue + * @version $Id$ + * @package System.Web.UI + * @since 3.1.1 + */ +class TCachePageStatePersister extends TComponent implements IPageStatePersister +{ + private $_prefix='statepersister'; + private $_page; + private $_cache=null; + private $_cacheModuleID=''; + private $_timeout=1800; + + /** + * @param TPage the page that this persister works for + */ + public function getPage() + { + return $this->_page; + } + + /** + * @param TPage the page that this persister works for. + */ + public function setPage(TPage $page) + { + $this->_page=$page; + } + + /** + * @return string the ID of the cache module. + */ + public function getCacheModuleID() + { + return $this->_cacheModuleID; + } + + /** + * @param string the ID of the cache module. If not set, the primary cache module will be used. + */ + public function setCacheModuleID($value) + { + $this->_cacheModuleID=$value; + } + + /** + * @return ICache the cache module being used for data storage + */ + public function getCache() + { + if($this->_cache===null) + { + if($this->_cacheModuleID!=='') + $cache=Prado::getApplication()->getModule($this->_cacheModuleID); + else + $cache=Prado::getApplication()->getCache(); + if($cache===null || !($cache instanceof ICache)) + { + if($this->_cacheModule!=='') + throw new TConfigurationException('cachepagestatepersister_cachemoduleid_invalid',$this->_cacheModuleID); + else + throw new TConfigurationException('cachepagestatepersister_cache_required'); + } + $this->_cache=$cache; + } + return $this->_cache; + } + + /** + * @return integer the number of seconds in which the cached state will expire. Defaults to 1800. + */ + public function getCacheTimeout() + { + return $this->_timeout; + } + + /** + * @param integer the number of seconds in which the cached state will expire. 0 means never expire. + * @throws TInvalidDataValueException if the number is smaller than 0. + */ + public function setCacheTimeout($value) + { + if(($value=TPropertyValue::ensureInteger($value))>=0) + $this->_timeout=$value; + else + throw new TInvalidDataValueException('cachepagestatepersister_timeout_invalid'); + } + + /** + * @return string prefix of cache variable name to avoid conflict with other cache data. Defaults to 'statepersister'. + */ + public function getKeyPrefix() + { + return $this->_prefix; + } + + /** + * @param string prefix of cache variable name to avoid conflict with other cache data + */ + public function setKeyPrefix($value) + { + $this->_prefix=$value; + } + + /** + * @param string micro timestamp when saving state occurs + * @return string a key that is unique per user request + */ + protected function calculateKey($timestamp) + { + return $this->getKeyPrefix().':' + . $this->_page->getRequest()->getUserHostAddress() + . $this->_page->getPagePath() + . $timestamp; + } + + /** + * Saves state in cache. + * @param mixed state to be stored + */ + public function save($state) + { + $data=serialize($state); + $timestamp=(string)microtime(true); + $key=$this->calculateKey($timestamp); + $this->getCache()->add($key,$data,$this->_timeout); + $this->_page->setClientState(TPageStateFormatter::serialize($this->_page,$timestamp)); + } + + /** + * Loads page state from cache. + * @return mixed the restored state + * @throws THttpException if page state is corrupted + */ + public function load() + { + if(($timestamp=TPageStateFormatter::unserialize($this->_page,$this->_page->getRequestClientState()))!==null) + { + $key=$this->calculateKey($timestamp); + if(($data=$this->getCache()->get($key))!==false) + return unserialize($data); + } + throw new THttpException(400,'cachepagestatepersister_pagestate_corrupted'); + } +} + +?> \ No newline at end of file diff --git a/framework/Web/UI/TSessionPageStatePersister.php b/framework/Web/UI/TSessionPageStatePersister.php index 964ad366..6c7d9669 100644 --- a/framework/Web/UI/TSessionPageStatePersister.php +++ b/framework/Web/UI/TSessionPageStatePersister.php @@ -87,7 +87,7 @@ class TSessionPageStatePersister extends TComponent implements IPageStatePersist throw new TInvalidDataValueException('sessionpagestatepersister_historysize_invalid'); } /** - * Saves state in hidden fields. + * Saves state in session. * @param mixed state to be stored */ public function save($state) @@ -111,7 +111,7 @@ class TSessionPageStatePersister extends TComponent implements IPageStatePersist } /** - * Loads page state from hidden fields. + * Loads page state from session. * @return mixed the restored state * @throws THttpException if page state is corrupted */ -- cgit v1.2.3