1 files changed, 86 insertions, 0 deletions
diff --git a/framework/TApplicationStatePersister.php b/framework/TApplicationStatePersister.php
new file mode 100644
index 00000000..b498ac72
--- /dev/null
+++ b/framework/TApplicationStatePersister.php
@@ -0,0 +1,86 @@
+<?php
+/**
+ * TApplication class file
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.pradosoft.com/
+ * @copyright Copyright &copy; 2005-2014 PradoSoft
+ * @license http://www.pradosoft.com/license/
+ * @package System
+ */
+
+/**
+ * TApplicationStatePersister class.
+ * TApplicationStatePersister provides a file-based persistent storage
+ * for application state. Application state, when serialized, is stored
+ * in a file named 'global.cache' under the 'runtime' directory of the application.
+ * Cache will be exploited if it is enabled.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System
+ * @since 3.0
+ */
+class TApplicationStatePersister extends TModule implements IStatePersister
+{
+	/**
+	 * Name of the value stored in cache
+	 */
+	const CACHE_NAME='prado:appstate';
+
+	/**
+	 * Initializes module.
+	 * @param TXmlElement module configuration (may be null)
+	 */
+	public function init($config)
+	{
+		$this->getApplication()->setApplicationStatePersister($this);
+	}
+
+	/**
+	 * @return string the file path storing the application state
+	 */
+	protected function getStateFilePath()
+	{
+		return $this->getApplication()->getRuntimePath().'/global.cache';
+	}
+
+	/**
+	 * Loads application state from persistent storage.
+	 * @return mixed application state
+	 */
+	public function load()
+	{
+		if(($cache=$this->getApplication()->getCache())!==null && ($value=$cache->get(self::CACHE_NAME))!==false)
+			return unserialize($value);
+		else
+		{
+			if(($content=@file_get_contents($this->getStateFilePath()))!==false)
+				return unserialize($content);
+			else
+				return null;
+		}
+	}
+
+	/**
+	 * Saves application state in persistent storage.
+	 * @param mixed application state
+	 */
+	public function save($state)
+	{
+		$content=serialize($state);
+		$saveFile=true;
+		if(($cache=$this->getApplication()->getCache())!==null)
+		{
+			if($cache->get(self::CACHE_NAME)===$content)
+				$saveFile=false;
+			else
+				$cache->set(self::CACHE_NAME,$content);
+		}
+		if($saveFile)
+		{
+			$fileName=$this->getStateFilePath();
+			file_put_contents($fileName,$content,LOCK_EX);
+		}
+	}
+
+}
+\ No newline at end of file