<?php

// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
/**
 * Wincache缓存驱动.
 *
 * @category   Extend
 *
 * @author    liu21st <liu21st@gmail.com>
 */
class CacheWincache extends Cache
{
    /**
     * 架构函数.
     *
     * @param array $options 缓存参数
     */
    public function __construct($options = array())
    {
        if (!function_exists('wincache_ucache_info')) {
            throw_exception(L('_NOT_SUPPERT_').':WinCache');
        }
        $this->options['expire'] = isset($options['expire']) ? $options['expire'] : C('DATA_CACHE_TIME');
        $this->options['prefix'] = isset($options['prefix']) ? $options['prefix'] : C('DATA_CACHE_PREFIX');
        $this->options['length'] = isset($options['length']) ? $options['length'] : 0;
    }

    /**
     * 读取缓存.
     *
     * @param string $name 缓存变量名
     *
     * @return mixed
     */
    public function get($name)
    {
        N('cache_read', 1);
        $name = $this->options['prefix'].$name;

        return wincache_ucache_exists($name) ? wincache_ucache_get($name) : false;
    }

    /**
     * 写入缓存.
     *
     * @param string $name   缓存变量名
     * @param mixed  $value  存储数据
     * @param int    $expire 有效时间（秒）
     *
     * @return boolen
     */
    public function set($name, $value, $expire = null)
    {
        N('cache_write', 1);
        if (is_null($expire)) {
            $expire = $this->options['expire'];
        }
        $name = $this->options['prefix'].$name;
        if (wincache_ucache_set($name, $value, $expire)) {
            if ($this->options['length'] > 0) {
                // 记录缓存队列
                $this->queue($name);
            }

            return true;
        }

        return false;
    }

    /**
     * 删除缓存.
     *
     * @param string $name 缓存变量名
     *
     * @return boolen
     */
    public function rm($name)
    {
        return wincache_ucache_delete($this->options['prefix'].$name);
    }

    /**
     * 清除缓存.
     *
     * @return boolen
     */
    public function clear()
    {
        return wincache_ucache_clear();
    }
}
