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<?php
/**
* @package Joomla.Platform
* @subpackage Observer
*
* @copyright Copyright (C) 2005 - 2015 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));
*
* @link https://docs.joomla.org/JObservableInterface
* @since 3.1.2
*/
interface JObservableInterface
{
/**
* Adds an observer to this JObservableInterface instance.
* Ideally, this method should be called fron the constructor of JObserverInterface
* which should be instanciated 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);
}