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<?php /** * @package Joomla.Platform * @subpackage Observer * * @copyright Copyright (C) 2005 - 2020 Open Source Matters, Inc. All rights reserved. * @license GNU General Public License version 2 or later; see LICENSE */ defined('JPATH_PLATFORM') or die; /** * Observable Subject pattern interface for Joomla * * To make a class and its inheriting classes observable: * 1) add: implements JObservableInterface * to its class * * 2) at the end of the constructor, add: * // Create observer updater and attaches all observers interested by $this class: * $this->_observers = new JObserverUpdater($this); * JObserverMapper::attachAllObservers($this); * * 3) add the function attachObserver below to your class to add observers using the JObserverUpdater class: * public function attachObserver(JObserverInterface $observer) * { * $this->_observers->attachObserver($observer); * } * * 4) in the methods that need to be observed, add, e.g. (name of event, params of event): * $this->_observers->update('onBeforeLoad', array($keys, $reset)); * * @since 3.1.2 */ interface JObservableInterface { /** * Adds an observer to this JObservableInterface instance. * Ideally, this method should be called from the constructor of JObserverInterface * which should be instantiated by JObserverMapper. * The implementation of this function can use JObserverUpdater * * @param JObserverInterface $observer The observer to attach to $this observable subject * * @return void * * @since 3.1.2 */ public function attachObserver(JObserverInterface $observer); }