package it.shb.ssm.service.impl;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import com.danga.MemCached.MemCachedClient;

import it.shb.ssm.mapper.UserMapper;
import it.shb.ssm.po.User;

@Service("userService")
public class UserServiceImpl implements IUserService {
  @Resource
  private UserMapper userMapper;
  
  @Resource
  private  MemCachedClient memcachedClient;
  
 /* 使用下面的方法实例化MemCachedClient也可以，在spring的配置文件中就可以不用配置相应的MemCachedClient的bean了。
  * 下面的方法中构造函数中的值必须和spring的配置文件中的poolname保持一致，否则将会报错。
  * private static MemCachedClient memcachedClient;
  * static {  
      if (memcachedClient == null)  
    	  memcachedClient = new MemCachedClient("memcachedPool");  
  } */

public User getUser(String userName) {
	User user;
	//判断缓存中数据是否存在，如果不存在则添加，存在则读取
	if(memcachedClient.get("user")!=null){
		System.out.println("从缓存中取到的值....");
	   user=(User) memcachedClient.get("user");
	}else{
	    System.out.println("从数据库中取到的值...."); 
	   user=userMapper.getUser(userName);
	   memcachedClient.add("user", user, 60000);
	}
	   return user;
	}
}