[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 <liu21st@gmail.com>
// +----------------------------------------------------------------------
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);
}

}