[李景山php]thinkphp核心源码注释|Eaccelerator.class.php

<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <[e-mail]>
// +----------------------------------------------------------------------
namespace Think\Cache\Driver;
use Think\Cache;
defined('THINK_PATH') or exit();
/**
 * Eaccelerator缓存驱动
 */
// opcode 一类的缓存
class Eaccelerator extends Cache {

    /**
     * 架构函数
     * @param array $options 缓存参数
     * @access public
     */
    // 通用参数 设置
    public function __construct($options=array()) {
        $this->options['expire'] =  isset($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
     * @access public
     * @param string $name 缓存变量名
     * @return mixed
     */
    // 官方获取缓存封装
     public function get($name) {
        N('cache_read',1);
         return eaccelerator_get($this->options['prefix'].$name);
     }

    /**
     * 写入缓存
     * @access public
     * @param string $name 缓存变量名
     * @param mixed $value  存储数据
     * @param integer $expire  有效时间（秒）
     * @return boolean
     */
    // 官方获取缓存设置
     public function set($name, $value, $expire = null) {
        N('cache_write',1);
        if(is_null($expire)) {
            $expire  =  $this->options['expire'];
        }
        $name   =   $this->options['prefix'].$name;
         // 上面为基础处理
         // 开始正式的 写入处理
        eaccelerator_lock($name); // 锁定
        if(eaccelerator_put($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
     * @access public
     * @param string $name 缓存变量名
     * @return boolean
     */
     public function rm($name) {
         return eaccelerator_rm($this->options['prefix'].$name);
     }

}