output.php

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<?php
/**
 * @package     Joomla.Platform
 * @subpackage  Cache
 *
 * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

/**
 * Joomla Cache output type object
 *
 * @package     Joomla.Platform
 * @subpackage  Cache
 * @since       11.1
 */
class JCacheControllerOutput extends JCacheController
{
        /**
         * Cache data ID
         *
         * @var    string
         * @since  11.1
         */
        protected $_id;

        /**
         * Cache data group
         *
         * @var    string
         * @since  11.1
         */
        protected $_group;

        /**
         * Object to test locked state
         *
         * @var    object
         * @since  11.1
         */
        protected $_locktest = null;

        /**
         * Start the cache
         *
         * @param   string  $id     The cache data id
         * @param   string  $group  The cache data group
         *
         * @return  boolean  True if the cache is hit (false else)
         *
         * @since   11.1
         */
        public function start($id, $group = null)
        {
                // If we have data in cache use that.
                $data = $this->cache->get($id, $group);

                $this->_locktest = new stdClass;
                $this->_locktest->locked = null;
                $this->_locktest->locklooped = null;

                if ($data === false)
                {
                        $this->_locktest = $this->cache->lock($id, $group);
                        if ($this->_locktest->locked == true && $this->_locktest->locklooped == true)
                        {
                                $data = $this->cache->get($id, $group);
                        }
                }

                if ($data !== false)
                {
                        $data = unserialize(trim($data));
                        echo $data;
                        if ($this->_locktest->locked == true)
                        {
                                $this->cache->unlock($id, $group);
                        }
                        return true;
                }
                else
                {
                        // Nothing in cache... let's start the output buffer and start collecting data for next time.
                        if ($this->_locktest->locked == false)
                        {
                                $this->_locktest = $this->cache->lock($id, $group);
                        }
                        ob_start();
                        ob_implicit_flush(false);

                        // Set id and group placeholders
                        $this->_id = $id;
                        $this->_group = $group;

                        return false;
                }
        }

        /**
         * Stop the cache buffer and store the cached data
         *
         * @return  boolean  True if cache stored
         *
         * @since   11.1
         */
        public function end()
        {
                // Get data from output buffer and echo it
                $data = ob_get_contents();
                ob_end_clean();
                echo $data;

                // Get id and group and reset them placeholders
                $id = $this->_id;
                $group = $this->_group;
                $this->_id = null;
                $this->_group = null;

                // Get the storage handler and store the cached data
                $ret = $this->cache->store(serialize($data), $id, $group);

                if ($this->_locktest->locked == true)
                {
                        $this->cache->unlock($id, $group);
                }

                return $ret;
        }
}