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+<?php
+/**
+ * Core interfaces essential for TApplication class.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link https://github.com/pradosoft/prado
+ * @copyright Copyright &copy; 2005-2015 The PRADO Group
+ * @license https://github.com/pradosoft/prado/blob/master/COPYRIGHT
+ * @package System
+ */
+
+/**
+ * IModule interface.
+ *
+ * This interface must be implemented by application modules.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System
+ * @since 3.0
+ */
+interface IModule
+{
+	/**
+	 * Initializes the module.
+	 * @param TXmlElement the configuration for the module
+	 */
+	public function init($config);
+	/**
+	 * @return string ID of the module
+	 */
+	public function getID();
+	/**
+	 * @param string ID of the module
+	 */
+	public function setID($id);
+}
+
+/**
+ * IService interface.
+ *
+ * This interface must be implemented by services.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System
+ * @since 3.0
+ */
+interface IService
+{
+	/**
+	 * Initializes the service.
+	 * @param TXmlElement the configuration for the service
+	 */
+	public function init($config);
+	/**
+	 * @return string ID of the service
+	 */
+	public function getID();
+	/**
+	 * @param string ID of the service
+	 */
+	public function setID($id);
+	/**
+	 * @return boolean whether the service is enabled
+	 */
+	public function getEnabled();
+	/**
+	 * @param boolean whether the service is enabled
+	 */
+	public function setEnabled($value);
+	/**
+	 * Runs the service.
+	 */
+	public function run();
+}
+
+/**
+ * ITextWriter interface.
+ *
+ * This interface must be implemented by writers.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System
+ * @since 3.0
+ */
+interface ITextWriter
+{
+	/**
+	 * Writes a string.
+	 * @param string string to be written
+	 */
+	public function write($str);
+	/**
+	 * Flushes the content that has been written.
+	 */
+	public function flush();
+}
+
+
+/**
+ * IUser interface.
+ *
+ * This interface must be implemented by user objects.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System
+ * @since 3.0
+ */
+interface IUser
+{
+	/**
+	 * @return string username
+	 */
+	public function getName();
+	/**
+	 * @param string username
+	 */
+	public function setName($value);
+	/**
+	 * @return boolean if the user is a guest
+	 */
+	public function getIsGuest();
+	/**
+	 * @param boolean if the user is a guest
+	 */
+	public function setIsGuest($value);
+	/**
+	 * @return array list of roles that the user is of
+	 */
+	public function getRoles();
+	/**
+	 * @return array|string list of roles that the user is of. If it is a string, roles are assumed by separated by comma
+	 */
+	public function setRoles($value);
+	/**
+	 * @param string role to be tested
+	 * @return boolean whether the user is of this role
+	 */
+	public function isInRole($role);
+	/**
+	 * @return string user data that is serialized and will be stored in session
+	 */
+	public function saveToString();
+	/**
+	 * @param string user data that is serialized and restored from session
+	 * @return IUser the user object
+	 */
+	public function loadFromString($string);
+}
+
+/**
+ * IStatePersister class.
+ *
+ * This interface must be implemented by all state persister classes (such as
+ * {@link TPageStatePersister}, {@link TApplicationStatePersister}.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System
+ * @since 3.0
+ */
+interface IStatePersister
+{
+	/**
+	 * Loads state from a persistent storage.
+	 * @return mixed the state
+	 */
+	public function load();
+	/**
+	 * Saves state into a persistent storage.
+	 * @param mixed the state to be saved
+	 */
+	public function save($state);
+}
+
+
+/**
+ * ICache interface.
+ *
+ * This interface must be implemented by cache managers.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System
+ * @since 3.0
+ */
+interface ICache
+{
+	/**
+	 * Retrieves a value from cache with a specified key.
+	 * @param string a key identifying the cached value
+	 * @return mixed the value stored in cache, false if the value is not in the cache or expired.
+	 */
+	public function get($id);
+	/**
+	 * Stores a value identified by a key into cache.
+	 * If the cache already contains such a key, the existing value and
+	 * expiration time will be replaced with the new ones.
+	 *
+	 * @param string the key identifying the value to be cached
+	 * @param mixed the value to be cached
+	 * @param integer the number of seconds in which the cached value will expire. 0 means never expire.
+	 * @param ICacheDependency dependency of the cached item. If the dependency changes, the item is labelled invalid.
+	 * @return boolean true if the value is successfully stored into cache, false otherwise
+	 */
+	public function set($id,$value,$expire=0,$dependency=null);
+	/**
+	 * Stores a value identified by a key into cache if the cache does not contain this key.
+	 * Nothing will be done if the cache already contains the key.
+	 * @param string the key identifying the value to be cached
+	 * @param mixed the value to be cached
+	 * @param integer the number of seconds in which the cached value will expire. 0 means never expire.
+	 * @param ICacheDependency dependency of the cached item. If the dependency changes, the item is labelled invalid.
+	 * @return boolean true if the value is successfully stored into cache, false otherwise
+	 */
+	public function add($id,$value,$expire=0,$dependency=null);
+	/**
+	 * Deletes a value with the specified key from cache
+	 * @param string the key of the value to be deleted
+	 * @return boolean if no error happens during deletion
+	 */
+	public function delete($id);
+	/**
+	 * Deletes all values from cache.
+	 * Be careful of performing this operation if the cache is shared by multiple applications.
+	 */
+	public function flush();
+}
+
+/**
+ * ICacheDependency interface.
+ *
+ * This interface must be implemented by classes meant to be used as
+ * cache dependencies.
+ *
+ * Classes implementing this interface must support serialization and unserialization.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System
+ * @since 3.0
+ */
+interface ICacheDependency
+{
+	/**
+	 * @return boolean whether the dependency has changed. Defaults to false.
+	 */
+	public function getHasChanged();
+}
+
+/**
+ * IRenderable interface.
+ *
+ * This interface must be implemented by classes that can be rendered
+ * to end-users.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System
+ * @since 3.0
+ */
+interface IRenderable
+{
+	/**
+	 * Renders the component to end-users.
+	 * @param ITextWriter writer for the rendering purpose
+	 */
+	public function render($writer);
+}
+
+/**
+ * IBindable interface.
+ *
+ * This interface must be implemented by classes that are capable of performing databinding.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System
+ * @since 3.0
+ */
+interface IBindable
+{
+	/**
+	 * Performs databinding.
+	 */
+	public function dataBind();
+}
+
+/**
+ * IStyleable interface.
+ *
+ * This interface should be implemented by classes that support CSS styles.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System
+ * @since 3.1.0
+ */
+interface IStyleable
+{
+	/**
+	 * @return boolean whether the object has defined any style information
+	 */
+	public function getHasStyle();
+	/**
+	 * @return TStyle the object representing the css style of the object
+	 */
+	public function getStyle();
+	/**
+	 * Removes all styles associated with the object
+	 */
+	public function clearStyle();
+}
+
+/**
+ * IActiveControl interface.
+ *
+ * Active controls must implement IActiveControl interface.
+ *
+ * @author Wei Zhuo <weizhuo[at]gamil[dot]com>
+ * @package System
+ * @since 3.1
+ */
+interface IActiveControl
+{
+	/**
+	 * @return TBaseActiveControl Active control properties.
+	 */
+	public function getActiveControl();
+}
+
+/**
+ * ICallbackEventHandler interface.
+ *
+ * If a control wants to respond to callback event, it must implement this
+ * interface.
+ *
+ * @author Wei Zhuo <weizhuo[at]gamil[dot]com>
+ * @package System
+ * @since 3.1
+ */
+interface ICallbackEventHandler
+{
+	/**
+	 * Raises callback event. The implementation of this function should raise
+	 * appropriate event(s) (e.g. OnClick, OnCommand) indicating the component
+	 * is responsible for the callback event.
+	 * @param TCallbackEventParameter the parameter associated with the callback event
+	 */
+	public function raiseCallbackEvent($eventArgument);
+}
+
+/**
+ * IDataRenderer interface.
+ *
+ * If a control wants to be used a renderer for another data-bound control,
+ * this interface must be implemented.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System
+ * @since 3.1
+ */
+interface IDataRenderer
+{
+	/**
+	 * @return mixed the data bound to this object
+	 */
+	public function getData();
+
+	/**
+	 * @param mixed the data to be bound to this object
+	 */
+	public function setData($value);
+}