From 0d8044202bbd031e2a5e32166e568fe626263152 Mon Sep 17 00:00:00 2001
From: xue <>
Date: Tue, 11 Apr 2006 00:59:17 +0000
Subject: Added TSessionPageStatePersister.

---
 framework/Web/UI/TSessionPageStatePersister.php | 132 ++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 framework/Web/UI/TSessionPageStatePersister.php

(limited to 'framework/Web/UI/TSessionPageStatePersister.php')

diff --git a/framework/Web/UI/TSessionPageStatePersister.php b/framework/Web/UI/TSessionPageStatePersister.php
new file mode 100644
index 00000000..b003c4bd
--- /dev/null
+++ b/framework/Web/UI/TSessionPageStatePersister.php
@@ -0,0 +1,132 @@
+<?php
+/**
+ * TSessionPageStatePersister class file
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.pradosoft.com/
+ * @copyright Copyright &copy; 2005 PradoSoft
+ * @license http://www.pradosoft.com/license/
+ * @version $Revision: $  $Date: $
+ * @package System.Web.UI
+ */
+
+/**
+ * TSessionPageStatePersister class
+ *
+ * TSessionPageStatePersister implements a page state persistent method based on
+ * sessions. Page state are stored in user sessions and therefore, this persister
+ * requires session to be started and available.
+ *
+ * TSessionPageStatePersister keeps limited number of history states in session,
+ * mainly to preserve the precious server storage. The number is specified
+ * by {@link setHistorySize HistorySize}, which defaults to 10.
+ *
+ * There are a couple of ways to use TSessionPageStatePersister.
+ * One can override the page's {@link TPage::getStatePersister()} method and
+ * create a TSessionPageStatePersister instance there.
+ * Or one can configure the pages to use TSessionPageStatePersister in page configurations
+ * as follows,
+ * <code>
+ *   <pages StatePersisterClass="System.Web.UI.TSessionPageStatePersister" />
+ * </code>
+ * The above configuration will affect the pages under the directory containing
+ * this configuration and all its subdirectories.
+ * To configure individual pages to use TSessionPageStatePersister, use
+ * <code>
+ *   <pages>
+ *     <page id="PageID" StatePersisterClass="System.Web.UI.TSessionPageStatePersister" />
+ *   </pages>
+ * </code>
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Revision: $  $Date: $
+ * @package System.Web.UI
+ * @since 3.1
+ */
+class TSessionPageStatePersister extends TComponent implements IPageStatePersister
+{
+	const STATE_SESSION_KEY='PRADO_SESSION_PAGESTATE';
+	const QUEUE_SESSION_KEY='PRADO_SESSION_STATEQUEUE';
+
+	private $_page;
+	private $_historySize=10;
+
+	/**
+	 * @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 integer maximum number of page states that should be kept in session. Defaults to 10.
+	 */
+	public function getHistorySize()
+	{
+		return $this->_historySize;
+	}
+
+	/**
+	 * @param integer maximum number of page states that should be kept in session
+	 * @throws TInvalidDataValueException if the number is smaller than 1.
+	 */
+	public function setHistorySize($value)
+	{
+		if(($value=TPropertyValue::ensureInteger($value))>0)
+			$this->_historySize=$value;
+		else
+			throw new TInvalidDataValueException('sessionpagestatepersister_historysize_invalid');
+	}
+	/**
+	 * Saves state in hidden fields.
+	 * @param mixed state to be stored
+	 */
+	public function save($state)
+	{
+		$session=$this->_page->getSession();
+		$session->open();
+		$data=serialize($state);
+		$timestamp=(string)microtime(true);
+		$key=self::STATE_SESSION_KEY.$timestamp;
+		$session->add($key,$data);
+		if(($queue=$session->itemAt(self::QUEUE_SESSION_KEY))===null)
+			$queue=array();
+		$queue[]=$key;
+		if(count($queue)>$this->getHistorySize())
+		{
+			$expiredKey=array_shift($queue);
+			$session->remove($expiredKey);
+		}
+		$session->add(self::QUEUE_SESSION_KEY,$queue);
+		$this->_page->setClientState(TPageStateFormatter::serialize($this->_page,$timestamp));
+	}
+
+	/**
+	 * Loads page state from hidden fields.
+	 * @return mixed the restored state
+	 * @throws THttpException if page state is corrupted
+	 */
+	public function load()
+	{
+		if(($timestamp=TPageStateFormatter::unserialize($this->_page,$this->_page->getRequestClientState()))!==null)
+		{
+			$session=$this->_page->getSession();
+			$session->open();
+			$key=self::STATE_SESSION_KEY.$timestamp;
+			if(($data=$session->itemAt($key))!==null)
+				return unserialize($data);
+		}
+		throw new THttpException(400,'sessionpagestatepersister_pagestate_corrupted');
+	}
+}
+
+?>
\ No newline at end of file
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