WebApi使用redis模拟抢购场景

Redis客户端连接使用git 上的csredis https://github.com/2881099/csredis

本文示例代码在vs2015中调试，使用的是git上一个低版本代码，不支持net core，位置：https://download.youkuaiyun.com/download/scottfan/1241273

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using CSRedis;

namespace CommonWeb.Common
{
    public class RedisHelper
    {
        static RedisClient redisClient = null;
        static object rc = new object();
        static object redisUpdater = new object();
        public RedisHelper(string host,int port)
        {
            if (null == redisClient)
            {
                lock (rc)
                {
                    if (null == redisClient)
                    {
                        redisClient = new RedisClient(host, port);
                    }
                }
            }
        }
        public long placeOrder()
        {
            long result = 0;
            try
            {
                long lngBanlance = 0;
                long qty = 0;
                lock (redisUpdater)
                {
                    long.TryParse(redisClient.Get("Iphone"), out lngBanlance);
                }
                if (lngBanlance <= 0) return result;
                lock (redisUpdater)
                {                     
                    qty = redisClient.Decr("Iphone");
                }
                if (qty >= 0) result = 1;
            }
            catch (Exception ex)
            { }
            return result;
        }
        public string setSaleItemQTY(string key,int qty)
        {
            try
            {
                redisClient.Set(key, qty);
                return redisClient.Get(key);
            }
            catch(Exception ex)
            {
                return "";
            }
        }
    }
}

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using Newtonsoft.Json.Linq;
using CommonWeb.Common;
using Utility.HttpHelper;

namespace RestfulService.Controllers
{
    public class BuyController : ApiController
    {
        [HttpPost]
        public HttpResponseMessage PlaceOrder(JObject postData)
        {
            UtilHttpResult httpResult;
            try
            {
                string consumer = postData["consumer"].ToString();
                RedisHelper redisHelper = new RedisHelper("192.168.197.132", 6379);
                long order = redisHelper.placeOrder();
                if(order == 1)
                {
                    httpResult = UtilHttpResult.ok(string.Format("{0}下单成功！{1}", consumer, DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss fff")));
                }
                else
                {
                    httpResult = UtilHttpResult.ok(string.Format("{0}，您好，你购买的商品已售完!{1}", consumer, DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss fff")));
                }
            }
            catch(Exception ex)
            {
                httpResult = UtilHttpResult.fail("系经繁忙，请稍后！");
            }
            return httpResult.ToResponseMessage();
        }
    }
}

 在WinForm客户端中模拟5000人抢购

RedisClient redis = null;
        private void btnRedis_Click(object sender, EventArgs e)
        {
            bgWorker.DoWork += new DoWorkEventHandler(this.bgWorker_DoWork);
            bgWorker.RunWorkerCompleted += bgWorker_RunWorkerCompleted;
            redis = new RedisClient("192.168.197.132", 6379);
            redis.Set("Iphone", 10);
            Console.WriteLine("现有{0}台,开始抢购", redis.Get("Iphone"));
            bgWorker.RunWorkerAsync();
            btnRedis.Enabled = false;
            redis.Dispose();
        }
        private void bgWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            bool bSell = true;
            long qty = 0;
            Parallel.For(0, 5000, (i) =>
            {
                var param_dic = new Dictionary<string, object>()
                {
                    { "consumer", "Consumer"+i.ToString()}
                };
                var httpResult = ApiUtility.DoPostParameter(ApiManager.ApiUrl.PlaceOrder, param_dic, true);
                if (httpResult != null)
                {
                    Console.WriteLine(httpResult["Data"]);
                }
            });
            #region task
            //List<Task> taskList = new List<Task>();
            //TaskFactory taskFactory = Task.Factory;
            //for(int i=0;i<5000;i++)
            //{
            //    taskList.Add(taskFactory.StartNew((count) =>
            //    {
            //        try
            //        {
            //            var param_dic = new Dictionary<string, object>()
            //            {
            //                { "consumer", "Consumer"+count.ToString()}
            //            };
            //            var httpResult = ApiUtility.DoPostParameter(ApiManager.ApiUrl.PlaceOrder, param_dic, true);
            //            if (httpResult != null)
            //            {
            //                Console.WriteLine(httpResult["Data"]);
            //            }
            //        }
            //        catch (Exception ex)
            //        {
            //            Console.WriteLine(ex.Message);
            //        }
            //    }, i));
            //}
            //Task.WaitAll(taskList.ToArray());
            #endregion
            Console.WriteLine("现有{0}台,抢购结束", redis.Get("Iphone"));
            Action act = delegate ()
            {
                btnRedis.Enabled = true;
            };
            this.Invoke(act);
        }
        private void bgWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            bgWorker.RunWorkerCompleted -= bgWorker_RunWorkerCompleted;
            bgWorker.DoWork -= new DoWorkEventHandler(this.bgWorker_DoWork);
        }

 代码中Task与Parallel均有验证，执行顺序不同比较明显，其它没过多关注。本文算是记录的学习笔记吧，供以后对比。