library/smarty/libs/sysplugins/smarty_cacheresource_keyvaluestore.php
author Markus Broeker<broeker.markus@googlemail.com>
Sun, 14 Feb 2016 21:40:29 +0100
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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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 * Smarty Cache Handler Base for Key/Value Storage Implementations
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 * This class implements the functionality required to use simple key/value stores
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 * for hierarchical cache groups. key/value stores like memcache or APC do not support
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 * wildcards in keys, therefore a cache group cannot be cleared like "a|*" - which
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 * is no problem to filesystem and RDBMS implementations.
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 * This implementation is based on the concept of invalidation. While one specific cache
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 * can be identified and cleared, any range of caches cannot be identified. For this reason
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 * each level of the cache group hierarchy can have its own value in the store. These values
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 * are nothing but microtimes, telling us when a particular cache group was cleared for the
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 * last time. These keys are evaluated for every cache read to determine if the cache has
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 * been invalidated since it was created and should hence be treated as inexistent.
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 * Although deep hierarchies are possible, they are not recommended. Try to keep your
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 * cache groups as shallow as possible. Anything up 3-5 parents should be ok. So
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 * »a|b|c« is a good depth where »a|b|c|d|e|f|g|h|i|j|k« isn't. Try to join correlating
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 * cache groups: if your cache groups look somewhat like »a|b|$page|$items|$whatever«
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 * consider using »a|b|c|$page-$items-$whatever« instead.
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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_KeyValueStore extends Smarty_CacheResource {
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    /**
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     * cache for contents
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     *
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     * @var array
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     */
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    protected $contents = array();
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    /**
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     * cache for timestamps
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     *
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     * @var array
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     */
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    protected $timestamps = array();
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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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        $cached->filepath = $_template->source->uid . '#' . $this->sanitize($cached->source->resource) . '#' . $this->sanitize($cached->cache_id) . '#' . $this->sanitize($cached->compile_id);
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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 cached object
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     *
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     * @return void
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     */
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    public function populateTimestamp(Smarty_Template_Cached $cached) {
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        if (!$this->fetch($cached->filepath, $cached->source->name, $cached->cache_id, $cached->compile_id, $content, $timestamp, $cached->source->uid)) {
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            return;
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        }
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        $cached->content = $content;
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        $cached->timestamp = (int)$timestamp;
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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 || !$timestamp) {
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            if (!$this->fetch($_template->cached->filepath, $_template->source->name, $_template->cache_id, $_template->compile_id, $content, $timestamp, $_template->source->uid)) {
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                return false;
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            }
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        }
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        if (isset($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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        $this->addMetaTimestamp($content);
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        return $this->write(array($_template->cached->filepath => $content), $_template->properties['cache_lifetime']);
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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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            if (!$this->fetch($_template->cached->filepath, $_template->source->name, $_template->cache_id, $_template->compile_id, $content, $timestamp, $_template->source->uid)) {
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                return false;
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            }
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        }
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        if (isset($content)) {
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            return $content;
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   139
        }
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        return false;
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    }
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    /**
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     * Empty cache
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     * {@internal the $exp_time argument is ignored altogether }}
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     *
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     * @param  Smarty $smarty Smarty object
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     * @param  integer $exp_time expiration time [being ignored]
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     *
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     * @return integer number of cache files deleted [always -1]
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     * @uses purge() to clear the whole store
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     * @uses invalidate() to mark everything outdated if purge() is inapplicable
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     */
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    public function clearAll(Smarty $smarty, $exp_time = null) {
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        if (!$this->purge()) {
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            $this->invalidate(null);
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        }
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        return -1;
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   160
    }
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   161
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   162
    /**
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     * Empty cache for a specific template
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     * {@internal the $exp_time argument is ignored altogether}}
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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 [being ignored]
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     *
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     * @return integer number of cache files deleted [always -1]
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     * @uses buildCachedFilepath() to generate the CacheID
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     * @uses invalidate() to mark CacheIDs parent chain as outdated
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     * @uses delete() to remove CacheID from cache
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     */
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    public function clear(Smarty $smarty, $resource_name, $cache_id, $compile_id, $exp_time) {
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        $uid = $this->getTemplateUid($smarty, $resource_name, $cache_id, $compile_id);
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        $cid = $uid . '#' . $this->sanitize($resource_name) . '#' . $this->sanitize($cache_id) . '#' . $this->sanitize($compile_id);
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        $this->delete(array($cid));
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   181
        $this->invalidate($cid, $resource_name, $cache_id, $compile_id, $uid);
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   182
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   183
        return -1;
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   184
    }
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   185
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   186
    /**
4869aea77e21 Bröker-Framework BFW-1
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   187
     * Get template's unique ID
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   188
     *
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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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   193
     *
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   194
     * @return string filepath of cache file
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   195
     */
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   196
    protected function getTemplateUid(Smarty $smarty, $resource_name, $cache_id, $compile_id) {
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   197
        $uid = '';
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   198
        if (isset($resource_name)) {
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   199
            $tpl = new $smarty->template_class($resource_name, $smarty);
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   200
            if ($tpl->source->exists) {
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   201
                $uid = $tpl->source->uid;
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   202
            }
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   203
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   204
            // remove from template cache
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   205
            if ($smarty->allow_ambiguous_resources) {
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   206
                $_templateId = $tpl->source->unique_resource . $tpl->cache_id . $tpl->compile_id;
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   207
            } else {
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   208
                $_templateId = $smarty->joined_template_dir . '#' . $resource_name . $tpl->cache_id . $tpl->compile_id;
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diff changeset
   209
            }
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diff changeset
   210
            if (isset($_templateId[150])) {
4869aea77e21 Bröker-Framework BFW-1
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   211
                $_templateId = sha1($_templateId);
4869aea77e21 Bröker-Framework BFW-1
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diff changeset
   212
            }
4869aea77e21 Bröker-Framework BFW-1
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   213
            unset($smarty->template_objects[$_templateId]);
4869aea77e21 Bröker-Framework BFW-1
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diff changeset
   214
        }
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   215
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   216
        return $uid;
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   217
    }
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   218
4869aea77e21 Bröker-Framework BFW-1
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   219
    /**
4869aea77e21 Bröker-Framework BFW-1
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   220
     * Sanitize CacheID components
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parents:
diff changeset
   221
     *
4869aea77e21 Bröker-Framework BFW-1
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   222
     * @param  string $string CacheID component to sanitize
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   223
     *
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   224
     * @return string sanitized CacheID component
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   225
     */
4869aea77e21 Bröker-Framework BFW-1
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parents:
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   226
    protected function sanitize($string) {
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   227
        // some poeple smoke bad weed
4869aea77e21 Bröker-Framework BFW-1
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   228
        $string = trim($string, '|');
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   229
        if (!$string) {
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   230
            return null;
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   231
        }
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   232
4869aea77e21 Bröker-Framework BFW-1
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   233
        return preg_replace('#[^\w\|]+#S', '_', $string);
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parents:
diff changeset
   234
    }
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parents:
diff changeset
   235
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   236
    /**
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   237
     * Fetch and prepare a cache object.
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   238
     *
4869aea77e21 Bröker-Framework BFW-1
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parents:
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   239
     * @param  string $cid CacheID to fetch
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   240
     * @param  string $resource_name template name
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   241
     * @param  string $cache_id cache id
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   242
     * @param  string $compile_id compile id
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   243
     * @param  string $content cached content
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   244
     * @param  integer &$timestamp cached timestamp (epoch)
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parents:
diff changeset
   245
     * @param  string $resource_uid resource's uid
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   246
     *
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   247
     * @return boolean success
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   248
     */
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   249
    protected function fetch($cid, $resource_name = null, $cache_id = null, $compile_id = null, &$content = null, &$timestamp = null, $resource_uid = null) {
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parents:
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   250
        $t = $this->read(array($cid));
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   251
        $content = !empty($t[$cid]) ? $t[$cid] : null;
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parents:
diff changeset
   252
        $timestamp = null;
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diff changeset
   253
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   254
        if ($content && ($timestamp = $this->getMetaTimestamp($content))) {
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   255
            $invalidated = $this->getLatestInvalidationTimestamp($cid, $resource_name, $cache_id, $compile_id, $resource_uid);
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parents:
diff changeset
   256
            if ($invalidated > $timestamp) {
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   257
                $timestamp = null;
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diff changeset
   258
                $content = null;
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   259
            }
4869aea77e21 Bröker-Framework BFW-1
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diff changeset
   260
        }
4869aea77e21 Bröker-Framework BFW-1
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diff changeset
   261
4869aea77e21 Bröker-Framework BFW-1
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   262
        return !!$content;
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   263
    }
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   264
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   265
    /**
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   266
     * Add current microtime to the beginning of $cache_content
4869aea77e21 Bröker-Framework BFW-1
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parents:
diff changeset
   267
     * {@internal the header uses 8 Bytes, the first 4 Bytes are the seconds, the second 4 Bytes are the microseconds}}
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parents:
diff changeset
   268
     *
4869aea77e21 Bröker-Framework BFW-1
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parents:
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   269
     * @param string &$content the content to be cached
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parents:
diff changeset
   270
     */
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   271
    protected function addMetaTimestamp(&$content) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   272
        $mt = explode(" ", microtime());
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   273
        $ts = pack("NN", $mt[1], (int)($mt[0] * 100000000));
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   274
        $content = $ts . $content;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   275
    }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   276
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   277
    /**
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   278
     * Extract the timestamp the $content was cached
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   279
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   280
     * @param  string &$content the cached content
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   281
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   282
     * @return float  the microtime the content was cached
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   283
     */
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   284
    protected function getMetaTimestamp(&$content) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   285
        extract(unpack('N1s/N1m/a*content', $content));
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   286
        return $s + ($m / 100000000);
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   287
    }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   288
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   289
    /**
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   290
     * Invalidate CacheID
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   291
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   292
     * @param  string $cid CacheID
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   293
     * @param  string $resource_name template name
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   294
     * @param  string $cache_id cache id
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   295
     * @param  string $compile_id compile id
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   296
     * @param  string $resource_uid source's uid
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   297
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   298
     * @return void
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   299
     */
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   300
    protected function invalidate($cid = null, $resource_name = null, $cache_id = null, $compile_id = null, $resource_uid = null) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   301
        $now = microtime(true);
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   302
        $key = null;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   303
        // invalidate everything
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   304
        if (!$resource_name && !$cache_id && !$compile_id) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   305
            $key = 'IVK#ALL';
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   306
        } // invalidate all caches by template
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   307
        else {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   308
            if ($resource_name && !$cache_id && !$compile_id) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   309
                $key = 'IVK#TEMPLATE#' . $resource_uid . '#' . $this->sanitize($resource_name);
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   310
            } // invalidate all caches by cache group
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   311
            else {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   312
                if (!$resource_name && $cache_id && !$compile_id) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   313
                    $key = 'IVK#CACHE#' . $this->sanitize($cache_id);
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   314
                } // invalidate all caches by compile id
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   315
                else {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   316
                    if (!$resource_name && !$cache_id && $compile_id) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   317
                        $key = 'IVK#COMPILE#' . $this->sanitize($compile_id);
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   318
                    } // invalidate by combination
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   319
                    else {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   320
                        $key = 'IVK#CID#' . $cid;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   321
                    }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   322
                }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   323
            }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   324
        }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   325
        $this->write(array($key => $now));
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   326
    }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   327
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   328
    /**
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   329
     * Determine the latest timestamp known to the invalidation chain
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   330
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   331
     * @param  string $cid CacheID to determine latest invalidation timestamp of
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   332
     * @param  string $resource_name template name
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   333
     * @param  string $cache_id cache id
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   334
     * @param  string $compile_id compile id
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   335
     * @param  string $resource_uid source's filepath
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   336
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   337
     * @return float  the microtime the CacheID was invalidated
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   338
     */
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   339
    protected function getLatestInvalidationTimestamp($cid, $resource_name = null, $cache_id = null, $compile_id = null, $resource_uid = null) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   340
        // abort if there is no CacheID
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   341
        if (false && !$cid) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   342
            return 0;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   343
        }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   344
        // abort if there are no InvalidationKeys to check
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   345
        if (!($_cid = $this->listInvalidationKeys($cid, $resource_name, $cache_id, $compile_id, $resource_uid))) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   346
            return 0;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   347
        }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   348
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   349
        // there are no InValidationKeys
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   350
        if (!($values = $this->read($_cid))) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   351
            return 0;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   352
        }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   353
        // make sure we're dealing with floats
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   354
        $values = array_map('floatval', $values);
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   355
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   356
        return max($values);
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   357
    }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   358
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   359
    /**
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   360
     * Translate a CacheID into the list of applicable InvalidationKeys.
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   361
     * Splits "some|chain|into|an|array" into array( '#clearAll#', 'some', 'some|chain', 'some|chain|into', ... )
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   362
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   363
     * @param  string $cid CacheID to translate
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   364
     * @param  string $resource_name template name
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   365
     * @param  string $cache_id cache id
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   366
     * @param  string $compile_id compile id
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   367
     * @param  string $resource_uid source's filepath
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   368
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   369
     * @return array  list of InvalidationKeys
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   370
     * @uses $invalidationKeyPrefix to prepend to each InvalidationKey
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   371
     */
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   372
    protected function listInvalidationKeys($cid, $resource_name = null, $cache_id = null, $compile_id = null, $resource_uid = null) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   373
        $t = array('IVK#ALL');
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   374
        $_name = $_compile = '#';
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   375
        if ($resource_name) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   376
            $_name .= $resource_uid . '#' . $this->sanitize($resource_name);
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   377
            $t[] = 'IVK#TEMPLATE' . $_name;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   378
        }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   379
        if ($compile_id) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   380
            $_compile .= $this->sanitize($compile_id);
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   381
            $t[] = 'IVK#COMPILE' . $_compile;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   382
        }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   383
        $_name .= '#';
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   384
        // some poeple smoke bad weed
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   385
        $cid = trim($cache_id, '|');
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   386
        if (!$cid) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   387
            return $t;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   388
        }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   389
        $i = 0;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   390
        while (true) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   391
            // determine next delimiter position
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   392
            $i = strpos($cid, '|', $i);
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   393
            // add complete CacheID if there are no more delimiters
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   394
            if ($i === false) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   395
                $t[] = 'IVK#CACHE#' . $cid;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   396
                $t[] = 'IVK#CID' . $_name . $cid . $_compile;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   397
                $t[] = 'IVK#CID' . $_name . $_compile;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   398
                break;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   399
            }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   400
            $part = substr($cid, 0, $i);
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   401
            // add slice to list
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   402
            $t[] = 'IVK#CACHE#' . $part;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   403
            $t[] = 'IVK#CID' . $_name . $part . $_compile;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   404
            // skip past delimiter position
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   405
            $i++;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   406
        }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   407
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   408
        return $t;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   409
    }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   410
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   411
    /**
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   412
     * Check is cache is locked for this template
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   413
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   414
     * @param  Smarty $smarty Smarty object
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   415
     * @param  Smarty_Template_Cached $cached cached object
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   416
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   417
     * @return boolean               true or false if cache is locked
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   418
     */
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   419
    public function hasLock(Smarty $smarty, Smarty_Template_Cached $cached) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   420
        $key = 'LOCK#' . $cached->filepath;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   421
        $data = $this->read(array($key));
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   422
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   423
        return $data && time() - $data[$key] < $smarty->locking_timeout;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   424
    }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   425
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   426
    /**
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   427
     * Lock cache for this template
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   428
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   429
     * @param Smarty $smarty Smarty object
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   430
     * @param Smarty_Template_Cached $cached cached object
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   431
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   432
     * @return bool|void
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   433
     */
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   434
    public function acquireLock(Smarty $smarty, Smarty_Template_Cached $cached) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   435
        $cached->is_locked = true;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   436
        $key = 'LOCK#' . $cached->filepath;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   437
        $this->write(array($key => time()), $smarty->locking_timeout);
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   438
    }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   439
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   440
    /**
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   441
     * Unlock cache for this template
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   442
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   443
     * @param Smarty $smarty Smarty object
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   444
     * @param Smarty_Template_Cached $cached cached object
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   445
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   446
     * @return bool|void
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   447
     */
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   448
    public function releaseLock(Smarty $smarty, Smarty_Template_Cached $cached) {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   449
        $cached->is_locked = false;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   450
        $key = 'LOCK#' . $cached->filepath;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   451
        $this->delete(array($key));
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   452
    }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   453
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   454
    /**
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   455
     * Read values for a set of keys from cache
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   456
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   457
     * @param  array $keys list of keys to fetch
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   458
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   459
     * @return array list of values with the given keys used as indexes
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   460
     */
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   461
    abstract protected function read(array $keys);
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   462
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   463
    /**
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   464
     * Save values for a set of keys to cache
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   465
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   466
     * @param  array $keys list of values to save
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   467
     * @param  int $expire expiration time
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   468
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   469
     * @return boolean true on success, false on failure
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   470
     */
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   471
    abstract protected function write(array $keys, $expire = null);
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   472
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   473
    /**
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   474
     * Remove values from cache
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   475
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   476
     * @param  array $keys list of keys to delete
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   477
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   478
     * @return boolean true on success, false on failure
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   479
     */
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   480
    abstract protected function delete(array $keys);
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   481
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   482
    /**
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   483
     * Remove *all* values from cache
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   484
     *
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   485
     * @return boolean true on success, false on failure
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   486
     */
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   487
    protected function purge() {
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   488
        return false;
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   489
    }
4869aea77e21 Bröker-Framework BFW-1
Markus Bröker <broeker.markus@googlemail.com>
parents:
diff changeset
   490
}