package com.miaosha.controller;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.thymeleaf.spring4.SpringTemplateEngine;
import org.thymeleaf.spring4.context.SpringWebContext;
import org.thymeleaf.spring4.view.ThymeleafViewResolver;
import com.alibaba.fastjson.JSON;
import com.miaosha.common.Result;
import com.miaosha.config.redis.GoodsKey;
import com.miaosha.config.redis.RedisService;
import com.miaosha.entity.MiaoshaUserEntity;
import com.miaosha.service.GoodsService;
import com.miaosha.service.MiaoshaUserService;
import com.miaosha.vo.GoodsVo;
/**
* 商品展示controller
*
* @创建时间：2018年6月20日
*/
@Controller
@RequestMapping("/goods")
public class GoodsController {
private static final Logger LOG = LoggerFactory.getLogger(GoodsController.class);
@Autowired
private GoodsService goodsService;
@Autowired
private MiaoshaUserService miaoshaUserService;
@Autowired
private RedisService redisService;
@Autowired
private ThymeleafViewResolver thymeleafViewResolver;
@Autowired
private ApplicationContext applicationContext;
/**
* 商品列表展示
*
* QPS: 500
*
* 模拟：5000个并发 * 10次循环 = 50000个请求
*
* 耗时：1分40秒
*
* 分析：在并发访问过程中，数据库服务器CPU占用率达到了95%，负载最高到了3(mysql装在单核cpu的虚拟机上，内存1GB)，
* 可见，并发访问中，造成QPS低的瓶颈在数据库。
*
* 关于负载介绍: https://zhidao.baidu.com/question/186962244.html
*
* @param model
* @param response
* @param miaoshaUserEntity
* @return
*/
@RequestMapping(value = "to_list", produces = "text/html") // produces，指定返回thml页面
@ResponseBody
public String toList(
Model model, HttpServletResponse response, HttpServletRequest request
// @CookieValue(value = MiaoshaUserServiceImpl.COOKIE_NAME_TOKEN, required = false) String cookieToken,
// @RequestParam(value = MiaoshaUserServiceImpl.COOKIE_NAME_TOKEN, required = false) String paramToken
// MiaoshaUserEntity miaoshaUserEntity
) {
// String token = null;
//
// if (StringUtils.isEmpty(paramToken)) {
// if (!StringUtils.isEmpty(cookieToken)) {
// token = cookieToken;
// }
// } else {
// token = paramToken;
// }
////
// if (StringUtils.isEmpty(token)) {
// return "/login";
// }
//
// MiaoshaUserEntity miaoshaUserEntity = miaoshaUserService.getByToken(token, response);
//
// if (miaoshaUserEntity == null) {
// return "/login";
// }
//
// model.addAttribute("user", miaoshaUserEntity);
// 添加html页面缓存到redis，也就是redis中缓存已经被渲染好的html静态页面
// -------------------------------------------------
// 取缓存redis缓存中的thymeleaf渲染好的html页面
String html = redisService.get(GoodsKey.getGoodsList, "", String.class);
if (!StringUtils.isEmpty(html)) {
return html;
}
List<GoodsVo> list = goodsService.selectGoodsVoList();
model.addAttribute("goodsList", list);
// 手动渲染thymeleaf模板
SpringWebContext swc = new SpringWebContext(request, response, request.getServletContext(),
request.getLocale(), model.asMap(), applicationContext); // 将model中数据放到SpringWebContext
SpringTemplateEngine templateEngine = thymeleafViewResolver.getTemplateEngine();
html = templateEngine.process("goods_list", swc); // thymeleaf模板引擎手动渲染出html页面
// if (!StringUtils.isEmpty(html)) {
// redisService.set(GoodsKey.getGoodsList, "", html); // 将渲染好的html页面放进缓存
// }
return html;
// -------------------------------------------------
}
/**
* 商品列表展示
*
*
*
* @return
*/
@RequestMapping("to_list_redis")
@ResponseBody
public Result<List<GoodsVo>> toListRedis() {
// redis缓存商品列表
// 1. 去redis取缓存
List<GoodsVo> redisGoodsList = redisService.get(GoodsKey.getGoodsList, "toList", List.class);
// 2. 缓存有，直接取出来，返回
if (redisGoodsList != null) {
LOG.info("=====从redis缓存中取数据=====");
return Result.success(redisGoodsList);
}
LOG.info("=====从mysql数据库中取数据=====");
// 3. 缓存中没有，从数据库拿，然后再放到缓存中
List<GoodsVo> list = goodsService.selectGoodsVoList();
if (list == null) {
LOG.info("=====mysql数据库中无数据=====");
return Result.success(null);
}
LOG.info("=====mysql数据库中数据放到redis缓存中=====");
// 放到redis缓存
redisService.set(GoodsKey.getGoodsList, "toList", list);
return Result.success(list);
}
/**
* 商品详情
*
* @param model
* @param goodsId
* @param user
* @return
*/
@RequestMapping("to_detail/{goodsId}")
public String toDetail(Model model, @PathVariable(value = "goodsId") Long goodsId, MiaoshaUserEntity user) {
GoodsVo goods = goodsService.getGoodsById(goodsId);
long startTime = goods.getStart_time().getTime();
long endTime = goods.getEnd_time().getTime();
long nowTime = System.currentTimeMillis();
int miaoshaStatus = 0;
int remainSeconds = 0;
if (startTime > nowTime) { // 秒杀未开始
miaoshaStatus = 0;
remainSeconds = (int) ((startTime - nowTime) / 1000);
} else if (nowTime > endTime) { // 秒杀已结束
miaoshaStatus = 2;
remainSeconds = -1;
} else { // 秒杀进行中
miaoshaStatus = 1;
remainSeconds = 0;
}
model.addAttribute("user", user);
model.addAttribute("goods", goods);
model.addAttribute("miaoshaStatus", miaoshaStatus);
model.addAttribute("remainSeconds", remainSeconds);
return "goods_detail";
}
public static void main(String[] args) {
List<GoodsVo> list = new ArrayList<>();
GoodsVo gv = new GoodsVo();
gv.setId(1L);
gv.setGoods_name("电脑1");
GoodsVo gv2 = new GoodsVo();
gv2.setId(2L);
gv2.setGoods_name("电脑2");
list.add(gv);
list.add(gv2);
String jsonString = JSON.toJSONString(list);
System.out.println(jsonString);
List<GoodsVo> parseObject = JSON.parseObject(jsonString, List.class);
System.out.println(parseObject);
}
}
