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<?php
/**
* Smarty Internal Plugin
*
* @package Smarty
* @subpackage Cacher
*/
/**
* Cache Handler API
*
* @package Smarty
* @subpackage Cacher
* @author Rodney Rehm
*/
abstract class Smarty_CacheResource_Custom extends Smarty_CacheResource
{
/**
* fetch cached content and its modification time from data source
*
* @param string $id unique cache content identifier
* @param string $name template name
* @param string $cache_id cache id
* @param string $compile_id compile id
* @param string $content cached content
* @param integer $mtime cache modification timestamp (epoch)
*
* @return void
*/
abstract protected function fetch($id, $name, $cache_id, $compile_id, &$content, &$mtime);
/**
* Fetch cached content's modification timestamp from data source
* {@internal implementing this method is optional.
* Only implement it if modification times can be accessed faster than loading the complete cached content.}}
*
* @param string $id unique cache content identifier
* @param string $name template name
* @param string $cache_id cache id
* @param string $compile_id compile id
*
* @return integer|boolean timestamp (epoch) the template was modified, or false if not found
*/
protected function fetchTimestamp($id, $name, $cache_id, $compile_id)
{
return false;
}
/**
* Save content to cache
*
* @param string $id unique cache content identifier
* @param string $name template name
* @param string $cache_id cache id
* @param string $compile_id compile id
* @param integer|null $exp_time seconds till expiration or null
* @param string $content content to cache
*
* @return boolean success
*/
abstract protected function save($id, $name, $cache_id, $compile_id, $exp_time, $content);
/**
* Delete content from cache
*
* @param string|null $name template name
* @param string|null $cache_id cache id
* @param string|null $compile_id compile id
* @param integer|null $exp_time seconds till expiration time in seconds or null
*
* @return integer number of deleted caches
*/
abstract protected function delete($name, $cache_id, $compile_id, $exp_time);
/**
* populate Cached Object with meta data from Resource
*
* @param Smarty_Template_Cached $cached cached object
* @param Smarty_Internal_Template $_template template object
*
* @return void
*/
public function populate(Smarty_Template_Cached $cached, Smarty_Internal_Template $_template)
{
$_cache_id = isset($cached->cache_id) ? preg_replace('![^\w\|]+!', '_', $cached->cache_id) : null;
$_compile_id = isset($cached->compile_id) ? preg_replace('![^\w]+!', '_', $cached->compile_id) : null;
$path = $cached->source->uid . $_cache_id . $_compile_id;
$cached->filepath = sha1($path);
if ($_template->smarty->cache_locking) {
$cached->lock_id = sha1('lock.' . $path);
}
$this->populateTimestamp($cached);
}
/**
* populate Cached Object with timestamp and exists from Resource
*
* @param Smarty_Template_Cached $cached
*
* @return void
*/
public function populateTimestamp(Smarty_Template_Cached $cached)
{
$mtime =
$this->fetchTimestamp($cached->filepath, $cached->source->name, $cached->cache_id, $cached->compile_id);
if ($mtime !== null) {
$cached->timestamp = $mtime;
$cached->exists = !!$cached->timestamp;
return;
}
$timestamp = null;
$this->fetch($cached->filepath, $cached->source->name, $cached->cache_id, $cached->compile_id, $cached->content,
$timestamp);
$cached->timestamp = isset($timestamp) ? $timestamp : false;
$cached->exists = !!$cached->timestamp;
}
/**
* Read the cached template and process the header
*
* @param \Smarty_Internal_Template $_smarty_tpl do not change variable name, is used by compiled template
* @param Smarty_Template_Cached $cached cached object
* @param boolean $update flag if called because cache update
*
* @return boolean true or false if the cached content does not exist
*/
public function process(Smarty_Internal_Template $_smarty_tpl, Smarty_Template_Cached $cached = null,
$update = false)
{
if (!$cached) {
$cached = $_smarty_tpl->cached;
}
$content = $cached->content ? $cached->content : null;
$timestamp = $cached->timestamp ? $cached->timestamp : null;
if ($content === null || !$timestamp) {
$this->fetch($_smarty_tpl->cached->filepath, $_smarty_tpl->source->name, $_smarty_tpl->cache_id,
$_smarty_tpl->compile_id, $content, $timestamp);
}
if (isset($content)) {
eval("?>" . $content);
$cached->content = null;
return true;
}
return false;
}
/**
* Write the rendered template output to cache
*
* @param Smarty_Internal_Template $_template template object
* @param string $content content to cache
*
* @return boolean success
*/
public function writeCachedContent(Smarty_Internal_Template $_template, $content)
{
return $this->save($_template->cached->filepath, $_template->source->name, $_template->cache_id,
$_template->compile_id, $_template->cache_lifetime, $content);
}
/**
* Read cached template from cache
*
* @param Smarty_Internal_Template $_template template object
*
* @return string|boolean content
*/
public function readCachedContent(Smarty_Internal_Template $_template)
{
$content = $_template->cached->content ? $_template->cached->content : null;
$timestamp = null;
if ($content === null) {
$timestamp = null;
$this->fetch($_template->cached->filepath, $_template->source->name, $_template->cache_id,
$_template->compile_id, $content, $timestamp);
}
if (isset($content)) {
return $content;
}
return false;
}
/**
* Empty cache
*
* @param Smarty $smarty Smarty object
* @param integer $exp_time expiration time (number of seconds, not timestamp)
*
* @return integer number of cache files deleted
*/
public function clearAll(Smarty $smarty, $exp_time = null)
{
return $this->delete(null, null, null, $exp_time);
}
/**
* Empty cache for a specific template
*
* @param Smarty $smarty Smarty object
* @param string $resource_name template name
* @param string $cache_id cache id
* @param string $compile_id compile id
* @param integer $exp_time expiration time (number of seconds, not timestamp)
*
* @return integer number of cache files deleted
*/
public function clear(Smarty $smarty, $resource_name, $cache_id, $compile_id, $exp_time)
{
$cache_name = null;
if (isset($resource_name)) {
$source = Smarty_Template_Source::load(null, $smarty, $resource_name);
if ($source->exists) {
$cache_name = $source->name;
} else {
return 0;
}
}
return $this->delete($cache_name, $cache_id, $compile_id, $exp_time);
}
/**
* Check is cache is locked for this template
*
* @param Smarty $smarty Smarty object
* @param Smarty_Template_Cached $cached cached object
*
* @return boolean true or false if cache is locked
*/
public function hasLock(Smarty $smarty, Smarty_Template_Cached $cached)
{
$id = $cached->lock_id;
$name = $cached->source->name . '.lock';
$mtime = $this->fetchTimestamp($id, $name, $cached->cache_id, $cached->compile_id);
if ($mtime === null) {
$this->fetch($id, $name, $cached->cache_id, $cached->compile_id, $content, $mtime);
}
return $mtime && ($t = time()) - $mtime < $smarty->locking_timeout;
}
/**
* Lock cache for this template
*
* @param Smarty $smarty Smarty object
* @param Smarty_Template_Cached $cached cached object
*
* @return bool|void
*/
public function acquireLock(Smarty $smarty, Smarty_Template_Cached $cached)
{
$cached->is_locked = true;
$id = $cached->lock_id;
$name = $cached->source->name . '.lock';
$this->save($id, $name, $cached->cache_id, $cached->compile_id, $smarty->locking_timeout, '');
}
/**
* Unlock cache for this template
*
* @param Smarty $smarty Smarty object
* @param Smarty_Template_Cached $cached cached object
*
* @return bool|void
*/
public function releaseLock(Smarty $smarty, Smarty_Template_Cached $cached)
{
$cached->is_locked = false;
$name = $cached->source->name . '.lock';
$this->delete($name, $cached->cache_id, $cached->compile_id, null);
}
}
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