230 lines
6.6 KiB
PHP
230 lines
6.6 KiB
PHP
<?php
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/**
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* Smarty Internal Plugin
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*
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* @package Smarty
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* @subpackage Cacher
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*/
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/**
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* Cache Handler API
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*
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* @package Smarty
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* @subpackage Cacher
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* @author Rodney Rehm
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*/
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abstract class Smarty_CacheResource
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{
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/**
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* resource types provided by the core
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*
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* @var array
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*/
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protected static $sysplugins = array(
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'file' => 'smarty_internal_cacheresource_file.php',
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);
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/**
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* populate Cached Object with meta data from Resource
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*
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* @param Smarty_Template_Cached $cached cached object
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* @param Smarty_Internal_Template $_template template object
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*
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* @return void
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*/
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abstract public function populate(Smarty_Template_Cached $cached, Smarty_Internal_Template $_template);
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/**
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* populate Cached Object with timestamp and exists from Resource
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*
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* @param Smarty_Template_Cached $cached
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*
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* @return void
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*/
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abstract public function populateTimestamp(Smarty_Template_Cached $cached);
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/**
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* Read the cached template and process header
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*
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* @param Smarty_Internal_Template $_template template object
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* @param Smarty_Template_Cached $cached cached object
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*
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* @return boolean true or false if the cached content does not exist
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*/
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abstract public function process(Smarty_Internal_Template $_template, Smarty_Template_Cached $cached = null);
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/**
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* Write the rendered template output to cache
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*
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* @param Smarty_Internal_Template $_template template object
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* @param string $content content to cache
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*
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* @return boolean success
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*/
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abstract public function writeCachedContent(Smarty_Internal_Template $_template, $content);
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/**
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* Return cached content
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*
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* @param Smarty_Internal_Template $_template template object
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*
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* @return null|string
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*/
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public function getCachedContent(Smarty_Internal_Template $_template)
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{
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if ($_template->cached->handler->process($_template)) {
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ob_start();
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$_template->properties['unifunc']($_template);
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return ob_get_clean();
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}
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return null;
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}
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/**
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* Empty cache
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*
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* @param Smarty $smarty Smarty object
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* @param integer $exp_time expiration time (number of seconds, not timestamp)
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*
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* @return integer number of cache files deleted
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*/
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abstract public function clearAll(Smarty $smarty, $exp_time = null);
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/**
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* Empty cache for a specific template
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*
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* @param Smarty $smarty Smarty object
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* @param string $resource_name template name
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* @param string $cache_id cache id
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* @param string $compile_id compile id
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* @param integer $exp_time expiration time (number of seconds, not timestamp)
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*
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* @return integer number of cache files deleted
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*/
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abstract public function clear(Smarty $smarty, $resource_name, $cache_id, $compile_id, $exp_time);
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/**
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* @param Smarty $smarty
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* @param Smarty_Template_Cached $cached
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*
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* @return bool|null
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*/
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public function locked(Smarty $smarty, Smarty_Template_Cached $cached)
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{
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// theoretically locking_timeout should be checked against time_limit (max_execution_time)
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$start = microtime(true);
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$hadLock = null;
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while ($this->hasLock($smarty, $cached)) {
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$hadLock = true;
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if (microtime(true) - $start > $smarty->locking_timeout) {
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// abort waiting for lock release
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return false;
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}
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sleep(1);
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}
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return $hadLock;
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}
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/**
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* Check is cache is locked for this template
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*
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* @param Smarty $smarty
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* @param Smarty_Template_Cached $cached
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*
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* @return bool
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*/
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public function hasLock(Smarty $smarty, Smarty_Template_Cached $cached)
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{
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// check if lock exists
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return false;
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}
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/**
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* Lock cache for this template
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*
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* @param Smarty $smarty
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* @param Smarty_Template_Cached $cached
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*
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* @return bool
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*/
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public function acquireLock(Smarty $smarty, Smarty_Template_Cached $cached)
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{
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// create lock
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return true;
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}
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/**
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* Unlock cache for this template
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*
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* @param Smarty $smarty
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* @param Smarty_Template_Cached $cached
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*
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* @return bool
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*/
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public function releaseLock(Smarty $smarty, Smarty_Template_Cached $cached)
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{
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// release lock
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return true;
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}
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/**
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* Load Cache Resource Handler
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*
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* @param Smarty $smarty Smarty object
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* @param string $type name of the cache resource
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*
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* @throws SmartyException
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* @return Smarty_CacheResource Cache Resource Handler
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*/
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public static function load(Smarty $smarty, $type = null)
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{
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if (!isset($type)) {
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$type = $smarty->caching_type;
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}
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// try smarty's cache
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if (isset($smarty->_cacheresource_handlers[$type])) {
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return $smarty->_cacheresource_handlers[$type];
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}
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// try registered resource
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if (isset($smarty->registered_cache_resources[$type])) {
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// do not cache these instances as they may vary from instance to instance
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return $smarty->_cacheresource_handlers[$type] = $smarty->registered_cache_resources[$type];
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}
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// try sysplugins dir
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if (isset(self::$sysplugins[$type])) {
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$cache_resource_class = 'Smarty_Internal_CacheResource_' . ucfirst($type);
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if (!class_exists($cache_resource_class, false)) {
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require SMARTY_SYSPLUGINS_DIR . self::$sysplugins[$type];
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}
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return $smarty->_cacheresource_handlers[$type] = new $cache_resource_class();
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}
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// try plugins dir
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$cache_resource_class = 'Smarty_CacheResource_' . ucfirst($type);
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if ($smarty->loadPlugin($cache_resource_class)) {
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return $smarty->_cacheresource_handlers[$type] = new $cache_resource_class();
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}
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// give up
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throw new SmartyException("Unable to load cache resource '{$type}'");
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}
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/**
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* Invalid Loaded Cache Files
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*
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* @param Smarty $smarty Smarty object
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*/
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public static function invalidLoadedCache(Smarty $smarty)
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{
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foreach ($smarty->template_objects as $tpl) {
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if (isset($tpl->cached)) {
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$tpl->cached->valid = false;
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$tpl->cached->processed = false;
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}
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}
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}
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}
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