library/smarty/libs/sysplugins/smarty_cacheresource_custom.php
author Markus Broeker<broeker.markus@googlemail.com>
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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_Custom extends Smarty_CacheResource {
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    /**
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     * fetch cached content and its modification time from data source
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     *
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     * @param  string $id unique cache content identifier
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     * @param  string $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  string $content cached content
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     * @param  integer $mtime cache modification timestamp (epoch)
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     *
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     * @return void
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     */
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    abstract protected function fetch($id, $name, $cache_id, $compile_id, &$content, &$mtime);
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    /**
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     * Fetch cached content's modification timestamp from data source
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     * {@internal implementing this method is optional.
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     *  Only implement it if modification times can be accessed faster than loading the complete cached content.}}
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     *
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     * @param  string $id unique cache content identifier
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     * @param  string $name template name
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     * @param  string $cache_id cache id
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     * @param  string $compile_id compile id
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     *
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     * @return integer|boolean timestamp (epoch) the template was modified, or false if not found
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     */
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    protected function fetchTimestamp($id, $name, $cache_id, $compile_id) {
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        return null;
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    }
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    /**
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     * Save content to cache
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     *
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     * @param  string $id unique cache content identifier
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     * @param  string $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|null $exp_time seconds till expiration or null
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     * @param  string $content content to cache
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     *
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     * @return boolean      success
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     */
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    abstract protected function save($id, $name, $cache_id, $compile_id, $exp_time, $content);
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    /**
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     * Delete content from cache
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     *
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     * @param  string $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|null $exp_time seconds till expiration time in seconds or null
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     *
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     * @return integer      number of deleted caches
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     */
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    abstract protected function delete($name, $cache_id, $compile_id, $exp_time);
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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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    public function populate(Smarty_Template_Cached $cached, Smarty_Internal_Template $_template) {
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        $_cache_id = isset($cached->cache_id) ? preg_replace('![^\w\|]+!', '_', $cached->cache_id) : null;
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        $_compile_id = isset($cached->compile_id) ? preg_replace('![^\w\|]+!', '_', $cached->compile_id) : null;
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        $path = $cached->source->filepath . $_cache_id . $_compile_id;
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        $cached->filepath = sha1($path);
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        if ($_template->smarty->cache_locking) {
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            $cached->lock_id = sha1('lock.' . $path);
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        }
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        $this->populateTimestamp($cached);
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    }
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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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    public function populateTimestamp(Smarty_Template_Cached $cached) {
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        $mtime = $this->fetchTimestamp($cached->filepath, $cached->source->name, $cached->cache_id, $cached->compile_id);
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        if ($mtime !== null) {
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            $cached->timestamp = $mtime;
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            $cached->exists = !!$cached->timestamp;
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            return;
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        }
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        $timestamp = null;
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        $this->fetch($cached->filepath, $cached->source->name, $cached->cache_id, $cached->compile_id, $cached->content, $timestamp);
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        $cached->timestamp = isset($timestamp) ? $timestamp : false;
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        $cached->exists = !!$cached->timestamp;
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    }
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    /**
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     * Read the cached template and process the 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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    public function process(Smarty_Internal_Template $_template, Smarty_Template_Cached $cached = null) {
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        if (!$cached) {
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            $cached = $_template->cached;
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        }
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        $content = $cached->content ? $cached->content : null;
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        $timestamp = $cached->timestamp ? $cached->timestamp : null;
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        if ($content === null || !$timestamp) {
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            $this->fetch(
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                $_template->cached->filepath,
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                $_template->source->name,
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                $_template->cache_id,
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                $_template->compile_id,
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                $content,
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                $timestamp
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            );
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        }
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        if (isset($content)) {
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            /** @var Smarty_Internal_Template $_smarty_tpl
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             * used in evaluated code
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             */
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            $_smarty_tpl = $_template;
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            eval("?>" . $content);
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            return true;
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        }
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        return false;
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    }
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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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    public function writeCachedContent(Smarty_Internal_Template $_template, $content) {
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        return $this->save(
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            $_template->cached->filepath,
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            $_template->source->name,
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            $_template->cache_id,
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            $_template->compile_id,
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            $_template->properties['cache_lifetime'],
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            $content
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        );
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    }
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    /**
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     * Read cached template from cache
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     *
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     * @param  Smarty_Internal_Template $_template template object
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     *
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     * @return string  content
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     */
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    public function readCachedContent(Smarty_Internal_Template $_template) {
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        $content = $_template->cached->content ? $_template->cached->content : null;
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        $timestamp = null;
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        if ($content === null) {
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            $timestamp = null;
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            $this->fetch(
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                $_template->cached->filepath,
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                $_template->source->name,
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                $_template->cache_id,
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                $_template->compile_id,
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                $content,
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                $timestamp
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            );
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        }
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        if (isset($content)) {
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            return $content;
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        }
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        return false;
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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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    public function clearAll(Smarty $smarty, $exp_time = null) {
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        $this->cache = array();
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        return $this->delete(null, null, null, $exp_time);
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    }
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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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   221
    public function clear(Smarty $smarty, $resource_name, $cache_id, $compile_id, $exp_time) {
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        $this->cache = array();
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   223
        $cache_name = null;
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   224
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   225
        if (isset($resource_name)) {
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   226
            $_save_stat = $smarty->caching;
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   227
            $smarty->caching = true;
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   228
            $tpl = new $smarty->template_class($resource_name, $smarty);
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diff changeset
   229
            $smarty->caching = $_save_stat;
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   230
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   231
            if ($tpl->source->exists) {
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   232
                $cache_name = $tpl->source->name;
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   233
            } else {
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   234
                return 0;
4869aea77e21 Bröker-Framework BFW-1
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   235
            }
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   236
            // remove from template cache
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   237
            if ($smarty->allow_ambiguous_resources) {
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diff changeset
   238
                $_templateId = $tpl->source->unique_resource . $tpl->cache_id . $tpl->compile_id;
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   239
            } else {
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   240
                $_templateId = $smarty->joined_template_dir . '#' . $resource_name . $tpl->cache_id . $tpl->compile_id;
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parents:
diff changeset
   241
            }
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diff changeset
   242
            if (isset($_templateId[150])) {
4869aea77e21 Bröker-Framework BFW-1
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   243
                $_templateId = sha1($_templateId);
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diff changeset
   244
            }
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   245
            unset($smarty->template_objects[$_templateId]);
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parents:
diff changeset
   246
            // template object no longer needed
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diff changeset
   247
            unset($tpl);
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diff changeset
   248
        }
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   249
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   250
        return $this->delete($cache_name, $cache_id, $compile_id, $exp_time);
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   251
    }
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   252
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   253
    /**
4869aea77e21 Bröker-Framework BFW-1
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   254
     * Check is cache is locked for this template
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   255
     *
4869aea77e21 Bröker-Framework BFW-1
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   256
     * @param  Smarty $smarty Smarty object
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     * @param  Smarty_Template_Cached $cached cached object
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   258
     *
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   259
     * @return boolean               true or false if cache is locked
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   260
     */
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   261
    public function hasLock(Smarty $smarty, Smarty_Template_Cached $cached) {
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   262
        $id = $cached->lock_id;
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diff changeset
   263
        $name = $cached->source->name . '.lock';
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parents:
diff changeset
   264
4869aea77e21 Bröker-Framework BFW-1
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   265
        $mtime = $this->fetchTimestamp($id, $name, $cached->cache_id, $cached->compile_id);
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parents:
diff changeset
   266
        if ($mtime === null) {
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parents:
diff changeset
   267
            $this->fetch($id, $name, $cached->cache_id, $cached->compile_id, $content, $mtime);
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parents:
diff changeset
   268
        }
4869aea77e21 Bröker-Framework BFW-1
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parents:
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   269
        return $mtime && ($t = time()) - $mtime < $smarty->locking_timeout;
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parents:
diff changeset
   270
    }
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parents:
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   271
4869aea77e21 Bröker-Framework BFW-1
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parents:
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   272
    /**
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   273
     * Lock cache for this template
4869aea77e21 Bröker-Framework BFW-1
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     *
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     * @param Smarty $smarty Smarty object
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     * @param Smarty_Template_Cached $cached cached object
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     *
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     * @return bool|void
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     */
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    public function acquireLock(Smarty $smarty, Smarty_Template_Cached $cached) {
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        $cached->is_locked = true;
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        $id = $cached->lock_id;
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        $name = $cached->source->name . '.lock';
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        $this->save($id, $name, $cached->cache_id, $cached->compile_id, $smarty->locking_timeout, '');
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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 Smarty object
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     * @param Smarty_Template_Cached $cached cached object
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     *
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     * @return bool|void
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     */
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    public function releaseLock(Smarty $smarty, Smarty_Template_Cached $cached) {
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        $cached->is_locked = false;
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        $name = $cached->source->name . '.lock';
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        $this->delete($name, $cached->cache_id, $cached->compile_id, null);
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    }
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}