library/smarty/libs/sysplugins/smarty_cacheresource.php
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<?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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     * 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 $_template) {
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        if ($_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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        // 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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        // 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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        // 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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        // 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, $type = null) {
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        if (!isset($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 $smarty) {
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        foreach ($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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}