library/smarty/demo/plugins/cacheresource.memcache.php
author Markus Bröker <broeker.markus@googlemail.com>
Fri, 13 Nov 2015 04:05:39 +0100
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<?php
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/**
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 * Memcache CacheResource
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 * CacheResource Implementation based on the KeyValueStore API to use
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 * memcache as the storage resource for Smarty's output caching.
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 * Note that memcache has a limitation of 256 characters per cache-key.
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 * To avoid complications all cache-keys are translated to a sha1 hash.
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 *
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 * @package CacheResource-examples
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 * @author  Rodney Rehm
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 */
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class Smarty_CacheResource_Memcache extends Smarty_CacheResource_KeyValueStore {
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    /**
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     * memcache instance
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     *
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     * @var Memcache
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     */
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    protected $memcache = null;
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    public function __construct() {
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        $this->memcache = new Memcache();
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        $this->memcache->addServer('127.0.0.1', 11211);
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    }
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    /**
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     * Read values for a set of keys from cache
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     *
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     * @param  array $keys list of keys to fetch
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     *
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     * @return array   list of values with the given keys used as indexes
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     * @return boolean true on success, false on failure
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     */
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    protected function read(array $keys) {
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        $_keys = $lookup = array();
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        foreach ($keys as $k) {
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            $_k = sha1($k);
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            $_keys[] = $_k;
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            $lookup[$_k] = $k;
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        }
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        $_res = array();
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        $res = $this->memcache->get($_keys);
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        foreach ($res as $k => $v) {
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            $_res[$lookup[$k]] = $v;
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        }
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        return $_res;
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    }
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    /**
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     * Save values for a set of keys to cache
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     *
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     * @param  array $keys list of values to save
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     * @param  int $expire expiration time
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     *
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     * @return boolean true on success, false on failure
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     */
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    protected function write(array $keys, $expire = null) {
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        foreach ($keys as $k => $v) {
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            $k = sha1($k);
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            $this->memcache->set($k, $v, 0, $expire);
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        }
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        return true;
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    }
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    /**
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     * Remove values from cache
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     *
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     * @param  array $keys list of keys to delete
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     *
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     * @return boolean true on success, false on failure
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     */
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    protected function delete(array $keys) {
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        foreach ($keys as $k) {
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            $k = sha1($k);
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            $this->memcache->delete($k);
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        }
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        return true;
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    }
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    /**
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     * Remove *all* values from cache
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     *
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     * @return boolean true on success, false on failure
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     */
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    protected function purge() {
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        $this->memcache->flush();
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    }
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}