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toma
Smarty Regular
Joined: 25 Apr 2003
Posts: 62
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 Posted: Sat Sep 30, 2006 1:34 am Post subject: Pear::Cache as cache_handler_func |
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This cache handler uses the now defunct pear::Cache 1.5.4 written by guru Ulf and lead developer Christian Stocker.... The cache is quite fast and easy to implement.
I needed a different caching mechanism because a directory with 35k cached files becomes impossible to work with. A clear_cache(null, 'group'); locked the server for several minutes while 'smarty' toiled away at indexing the cache dir and deleting the matching files. Certainly this is a combination of file system and smarty's cache implementation, but any file system will have issues with that many files in the same dir.
My solution was to implement Pear's Cache with a few changes to the file.php container to put cache groups into subdirectories. A $smarty->clear_cache('template.ihtml', 'group'); will delete all subdirectories under 'group'. template.ihtml will be it's own directory followed by subdirs for each group tokenized by |
This script assumes your include_path is intelligently built. Below is my core.cache_handler.php script:
| Code: |
<?
/**
* Cache handler using Pear::Cache
* The benefits of this include quicker cache searching with directories.
* This can be expanded to use shm for specific pages but the ::Cache
* author isn't optimistic about real speed improvements.
*
* @author Tom Anderson toma@etree.org
*/
require_once('Cache.php');
function smarty_cache_handler($action, &$t, &$content, $template = null, $cache_id = null, $compile_id = null, $expire = null) {
// Create the file cache object
$cache = new Cache('file',
array(
'cache_dir' => $t->cache_dir . $template . '/',
'file_chmod' => 0777
)
);
$cache->setCaching(true);
$id = $cache->generateID("$cache_id|$compile_id");
switch ($action) {
case 'read':
$content = $cache->get($id, $cache_id);
return (bool)$content;
case 'write':
return (bool)$cache->save($id, $content, $expire, $cache_id);
case 'clear':
return (bool)$cache->flush($cache_id);
default:
$t->trigger_error( 'cache_handler: Unknown cache action '. $action );
return false;
}
}
?>
[/php]
Changes to the file.php are addition of file_chmod to local properties and allowed options and a significant change to getFileName.
[php]
// mod stat for all file creation
var $file_chmod = 0777;
# Replacement for mkdir and clearstatcache:
// Allow for | to tokenize subgroups
$subgroups = explode('|', $group);
$dir = $this->cache_dir;
foreach ((array)$subgroups as $sub) {
$dir .= "$sub/";
if (!file_exists($dir)) {
mkdir($dir, $this->file_chmod);
$clear_stat = true;
}
}
if ($clear_stat) clearstatcache();
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