<?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 null;
}
/**
* 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 $name template name
* @param string $cache_id cache id
* @param string $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;
$cached->filepath = sha1($cached->source->filepath . $_cache_id . $_compile_id);
$this->populateTimestamp($cached);
}
/**
* populate Cached Object with timestamp and exists from Resource
*
* @param Smarty_Template_Cached $source cached object
* @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 $_template template object
* @param Smarty_Template_Cached $cached cached object
* @return booelan true or false if the cached content does not exist
*/
public function process(Smarty_Internal_Template $_template, Smarty_Template_Cached $cached=null)
{
if (!$cached) {
$cached = $_template->cached;
}
$content = $cached->content ? $cached->content : null;
$timestamp = $cached->timestamp ? $cached->timestamp : null;
if ($content === null || !$timestamp) {
$this->fetch(
$_template->cached->filepath,
$_template->source->name,
$_template->cache_id,
$_template->compile_id,
$content,
$timestamp
);
}
if (isset($content)) {
$_smarty_tpl = $_template;
eval("?>" . $content);
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->properties['cache_lifetime'],
$content
);
}
/**
* 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)
{
$this->cache = array();
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)
{
$this->cache = array();
return $this->delete($resource_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 booelan true or false if cache is locked
*/
public function hasLock(Smarty $smarty, Smarty_Template_Cached $cached)
{
$id = $cached->filepath;
$name = $cached->source->name . '.lock';
$mtime = $this->fetchTimestamp($id, $name, null, null);
if ($mtime === null) {
$this->fetch($id, $name, null, null, $content, $mtime);
}
return $mtime && time() - $mtime < $smarty->locking_timeout;
}
/**
* Lock cache for this template
*
* @param Smarty $smarty Smarty object
* @param Smarty_Template_Cached $cached cached object
*/
public function acquireLock(Smarty $smarty, Smarty_Template_Cached $cached)
{
$cached->is_locked = true;
$id = $cached->filepath;
$name = $cached->source->name . '.lock';
$this->save($id, $name, null, null, $smarty->locking_timeout, '');
}
/**
* Unlock cache for this template
*
* @param Smarty $smarty Smarty object
* @param Smarty_Template_Cached $cached cached object
*/
public function releaseLock(Smarty $smarty, Smarty_Template_Cached $cached)
{
$cached->is_locked = false;
$name = $cached->source->name . '.lock';
$this->delete($name, null, null, null);
}
}
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