148 lines
3.6 KiB
PHP
148 lines
3.6 KiB
PHP
<?php defined('SYSPATH') OR die('No direct script access.');
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/**
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* View fragment caching. This is primarily used to cache small parts of a view
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* that rarely change. For instance, you may want to cache the footer of your
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* template because it has very little dynamic content. Or you could cache a
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* user profile page and delete the fragment when the user updates.
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*
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* For obvious reasons, fragment caching should not be applied to any
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* content that contains forms.
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*
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* [!!] Multiple language (I18n) support was added in v3.0.4.
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*
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* @package Kohana
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* @category Helpers
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* @author Kohana Team
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* @copyright (c) 2009-2012 Kohana Team
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* @license http://kohanaframework.org/license
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* @uses Kohana::cache
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*/
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class Kohana_Fragment {
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/**
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* @var integer default number of seconds to cache for
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*/
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public static $lifetime = 30;
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/**
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* @var boolean use multilingual fragment support?
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*/
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public static $i18n = FALSE;
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/**
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* @var array list of buffer => cache key
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*/
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protected static $_caches = array();
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/**
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* Generate the cache key name for a fragment.
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*
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* $key = Fragment::_cache_key('footer', TRUE);
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*
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* @param string $name fragment name
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* @param boolean $i18n multilingual fragment support
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* @return string
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* @uses I18n::lang
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* @since 3.0.4
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*/
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protected static function _cache_key($name, $i18n = NULL)
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{
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if ($i18n === NULL)
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{
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// Use the default setting
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$i18n = Fragment::$i18n;
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}
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// Language prefix for cache key
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$i18n = ($i18n === TRUE) ? I18n::lang() : '';
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// Note: $i18n and $name need to be delimited to prevent naming collisions
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return 'Fragment::cache('.$i18n.'+'.$name.')';
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}
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/**
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* Load a fragment from cache and display it. Multiple fragments can
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* be nested with different life times.
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*
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* if ( ! Fragment::load('footer')) {
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* // Anything that is echo'ed here will be saved
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* Fragment::save();
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* }
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*
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* @param string $name fragment name
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* @param integer $lifetime fragment cache lifetime
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* @param boolean $i18n multilingual fragment support
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* @return boolean
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*/
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public static function load($name, $lifetime = NULL, $i18n = NULL)
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{
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// Set the cache lifetime
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$lifetime = ($lifetime === NULL) ? Fragment::$lifetime : (int) $lifetime;
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// Get the cache key name
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$cache_key = Fragment::_cache_key($name, $i18n);
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if ($fragment = Kohana::cache($cache_key, NULL, $lifetime))
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{
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// Display the cached fragment now
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echo $fragment;
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return TRUE;
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}
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else
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{
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// Start the output buffer
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ob_start();
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// Store the cache key by the buffer level
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Fragment::$_caches[ob_get_level()] = $cache_key;
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return FALSE;
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}
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}
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/**
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* Saves the currently open fragment in the cache.
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*
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* Fragment::save();
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*
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* @return void
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*/
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public static function save()
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{
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// Get the buffer level
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$level = ob_get_level();
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if (isset(Fragment::$_caches[$level]))
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{
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// Get the cache key based on the level
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$cache_key = Fragment::$_caches[$level];
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// Delete the cache key, we don't need it anymore
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unset(Fragment::$_caches[$level]);
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// Get the output buffer and display it at the same time
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$fragment = ob_get_flush();
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// Cache the fragment
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Kohana::cache($cache_key, $fragment);
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}
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}
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/**
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* Delete a cached fragment.
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*
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* Fragment::delete($key);
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*
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* @param string $name fragment name
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* @param boolean $i18n multilingual fragment support
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* @return void
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*/
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public static function delete($name, $i18n = NULL)
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{
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// Invalid the cache
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Kohana::cache(Fragment::_cache_key($name, $i18n), NULL, -3600);
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}
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}
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