ThinkPHP/Library/Vendor/Smarty/sysplugins/smarty_cacheresource_keyvaluestore.php

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<?php
/**
 * Smarty Internal Plugin
 *
 * @package Smarty
 * @subpackage Cacher
 */

/**
 * Smarty Cache Handler Base for Key/Value Storage Implementations
 *
 * This class implements the functionality required to use simple key/value stores
 * for hierarchical cache groups. key/value stores like memcache or APC do not support
 * wildcards in keys, therefore a cache group cannot be cleared like "a|*" - which
 * is no problem to filesystem and RDBMS implementations.
 *
 * This implementation is based on the concept of invalidation. While one specific cache
 * can be identified and cleared, any range of caches cannot be identified. For this reason
 * each level of the cache group hierarchy can have its own value in the store. These values
 * are nothing but microtimes, telling us when a particular cache group was cleared for the
 * last time. These keys are evaluated for every cache read to determine if the cache has
 * been invalidated since it was created and should hence be treated as inexistent.
 *
 * Although deep hierarchies are possible, they are not recommended. Try to keep your
 * cache groups as shallow as possible. Anything up 3-5 parents should be ok. So
 * »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
 * cache groups: if your cache groups look somewhat like »a|b|$page|$items|$whatever«
 * consider using »a|b|c|$page-$items-$whatever« instead.
 *
 * @package Smarty
 * @subpackage Cacher
 * @author Rodney Rehm
 */
abstract class Smarty_CacheResource_KeyValueStore extends Smarty_CacheResource {

    /**
     * cache for contents
     * @var array
     */
    protected $contents = array();
    /**
     * cache for timestamps
     * @var array
     */
    protected $timestamps = array();

    /**
     * populate Cached Object with meta data from Resource
     *
     * @param Smarty_Template_Cached   $cached    cached object
     * @param Smarty_Internal_Template $_template template object
     * @return void
     */
    public function populate(Smarty_Template_Cached $cached, Smarty_Internal_Template $_template)
    {
        $cached->filepath = $_template->source->uid
                . '#' . $this->sanitize($cached->source->name)
                . '#' . $this->sanitize($cached->cache_id)
                . '#' . $this->sanitize($cached->compile_id);