redis隊列處理檔案並發(Tlog)

標籤：redis解決檔案並發

    多線程操作同一個檔案時會出現並發問題。解決的一個辦法就是給檔案加鎖(lock),但是這樣的話，一個線程操作檔案時，其它的都得等待，這樣的話效能非常差。

另外一個解決方案，就是先將資料放在隊列中，然後開啟一個線程，負責從隊列中取出資料，再寫到檔案中。

using log4net;using RedisMvcApp.Models;using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Text;using System.Threading;using System.Web;using System.Web.Http;using System.Web.Mvc;using System.Web.Optimization;using System.Web.Routing;namespace RedisMvcApp{    // 注意: 有關啟用 IIS6 或 IIS7 傳統模式的說明，    // 請訪問 http://go.microsoft.com/?LinkId=9394801    public class MvcApplication : System.Web.HttpApplication    {        protected void Application_Start()        {            log4net.Config.XmlConfigurator.Configure();//擷取Log4Net配置資訊(配置資訊定義在Web.config檔案中)            AreaRegistration.RegisterAllAreas();            WebApiConfig.Register(GlobalConfiguration.Configuration);            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);            RouteConfig.RegisterRoutes(RouteTable.Routes);            BundleConfig.RegisterBundles(BundleTable.Bundles);            //通過線程開啟一個線程，然後不停的從隊列中或資料            string filePath = Server.MapPath("/Log/");            ThreadPool.QueueUserWorkItem(o =>            {                while (true)                {                    try                    {                      //  if (MyExecptionAttribute.ExceptionQueue.Count > 0)                        if (MyExecptionAttribute.redisClent.GetListCount("errorException") > 0)                        {                          //  Exception  ex= MyExecptionAttribute.ExceptionQueue.Dequeue();//從隊列中拿出資料                            string errorMsg = MyExecptionAttribute.redisClent.DequeueItemFromList("errorException");//從Redis隊列中取出異常資料                            //if (ex != null)                            if(!string.IsNullOrEmpty(errorMsg))                            {                                //構建成一個完整的路徑                              //  string fileName = filePath + DateTime.Now.ToString("yyyy-MM-dd").ToString() + ".txt";                                //string execptionMsg = ex.ToString();                             //   File.AppendAllText(fileName, errorMsg, Encoding.Default);//將異常寫到檔案中。                                ILog logger = LogManager.GetLogger("czbkError");                                logger.Error(errorMsg);//將異常資訊寫到Log4Net中.                            }                            else                            {                                Thread.Sleep(30);                            }                        }                        else                        {                            Thread.Sleep(30);//避免了CPU空轉。                        }                    }                    catch (Exception ex)                    {                        //MyExecptionAttribute.ExceptionQueue.Enqueue(ex);                        MyExecptionAttribute.redisClent.EnqueueItemOnList("errorException", ex.ToString());                    }                }            }, filePath);        }    }}

本文出自 “一無所有-天行者” 部落格，請務必保留此出處http://tianxingzhe.blog.51cto.com/3390077/1685342

redis隊列處理檔案並發(Tlog)