david
802479ed64
git-svn-id: https://192.168.0.254/svn/Proyectos.FundacionLQDVI_WebCongresos/trunk@2 94ccb1af-fd9d-d947-8d90-7f70ea60afc8
137 lines
3.2 KiB
PHP
137 lines
3.2 KiB
PHP
<?php
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/**
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* @version $Id: page.php 14401 2010-01-26 14:10:00Z louis $
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* @package Joomla.Framework
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* @subpackage Cache
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* @copyright Copyright (C) 2005 - 2010 Open Source Matters. All rights reserved.
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* @license GNU/GPL, see LICENSE.php
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* Joomla! is free software. This version may have been modified pursuant
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* to the GNU General Public License, and as distributed it includes or
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* is derivative of works licensed under the GNU General Public License or
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* other free or open source software licenses.
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* See COPYRIGHT.php for copyright notices and details.
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*/
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// Check to ensure this file is within the rest of the framework
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defined('JPATH_BASE') or die();
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/**
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* Joomla! Cache page type object
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*
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* @package Joomla.Framework
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* @subpackage Cache
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* @since 1.5
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*/
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class JCachePage extends JCache
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{
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/**
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* Get the cached page data
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*
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* @access public
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* @param string $id The cache data id
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* @param string $group The cache data group
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* @return boolean True if the cache is hit (false else)
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* @since 1.5
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*/
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function get( $id=false, $group='page' )
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{
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// Initialize variables
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$data = false;
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// If an id is not given generate it from the request
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if ($id == false) {
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$id = $this->_makeId();
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}
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// If the etag matches the page id ... sent a no change header and exit : utilize browser cache
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if ( !headers_sent() && isset($_SERVER['HTTP_IF_NONE_MATCH']) ){
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$etag = stripslashes($_SERVER['HTTP_IF_NONE_MATCH']);
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if( $etag == $id) {
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$browserCache = isset($this->_options['browsercache']) ? $this->_options['browsercache'] : false;
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if ($browserCache) {
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$this->_noChange();
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}
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}
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}
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// We got a cache hit... set the etag header and echo the page data
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$data = parent::get($id, $group);
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if ($data !== false) {
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$this->_setEtag($id);
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return $data;
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}
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// Set id and group placeholders
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$this->_id = $id;
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$this->_group = $group;
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return false;
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}
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/**
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* Stop the cache buffer and store the cached data
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*
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* @access public
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* @return boolean True if cache stored
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* @since 1.5
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*/
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function store()
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{
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// Get page data from JResponse body
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$data = JResponse::getBody();
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// Get id and group and reset them placeholders
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$id = $this->_id;
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$group = $this->_group;
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$this->_id = null;
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$this->_group = null;
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// Only attempt to store if page data exists
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if ($data) {
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return parent::store($data, $id, $group);
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}
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return false;
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}
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/**
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* Generate a page cache id
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* @todo Discuss whether this should be coupled to a data hash or a request hash ... perhaps hashed with a serialized request
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*
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* @access private
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* @return string MD5 Hash : page cache id
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* @since 1.5
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*/
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function _makeId()
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{
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return md5(JRequest::getURI());
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}
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/**
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* There is no change in page data so send a not modified header and die gracefully
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*
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* @access private
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* @return void
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* @since 1.5
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*/
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function _noChange()
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{
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global $mainframe;
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// Send not modified header and exit gracefully
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header( 'HTTP/1.x 304 Not Modified', true );
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$mainframe->close();
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}
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/**
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* Set the ETag header in the response
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*
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* @access private
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* @return void
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* @since 1.5
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*/
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function _setEtag($etag)
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{
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JResponse::setHeader( 'ETag', $etag, true );
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}
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}
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