Go homepage(回首页)
Upload pictures (上传图片)
Write articles (发文字帖)

The author:(作者)aaa
published in(发表于) 2013/12/18 8:20:14
无废话C#设计模式之二:Singleton_.net资料_编程技术

无废话C#设计模式之二:Singleton_.net资料_编程技术-你的首页-uuhomepage.com

  本系列文章将向大家介绍一下C#的设计模式,此为第二篇文章,相信对大家会有所帮助的。废话不多说,继续来看。


  意图


  保证一个类只有一个实例,并提供访问它的全局访问点。


  场景


  我们现在要做一个网络游戏的服务端程序,需要考虑怎么样才能承载大量的用户。在做WEB程序的时候有各种负载均衡的方案,不管是通过硬件实现还是软件实现,基本的思想就是有一个统一的入口,然后由它来分配用户到各个服务器上去。


  需要考虑的问题是,即使在多线程的并发状态下,用户只能通过一个唯一的入口来分配,由此引入了Singleton模式来实现这个唯一的入口。


  示例代码



  using System;
  using System.Collections.Generic;
  using System.Threading;
  namespace SingletonExample
  {
  class Program
  {
  static void Main(string[] args)
  {
  ParameterizedThreadStart ts = new ParameterizedThreadStart(EnterPlayer);
  for (int i = 0; i < 20; i++)
  {
  Thread t = new Thread(ts);
  t.Start("player" + i);
  }
  LoadBalanceServer.GetLoadBalanceServer().ShowServerInfo();
  }
  static void EnterPlayer(object playerName)
  {
  LoadBalanceServer lbs = LoadBalanceServer.GetLoadBalanceServer();
  lbs.GetLobbyServer().EnterPlayer(playerName.ToString());
  }
  }
  class LoadBalanceServer
  {
  private const int SERVER_COUNT = 3;
  private List serverList = new List();
  private static volatile LoadBalanceServer lbs;
  private static object syncLock = new object();
  public LoadBalanceServer()
  {
  for (int i = 0; i < SERVER_COUNT; i++)
  {
  serverList.Add(new LobbyServer("LobbyServer" + i));
  }
  }
  public static LoadBalanceServer GetLoadBalanceServer()
  {
  if (lbs == null)
  {
  lock (syncLock)
  {
  if (lbs == null)
  {
  Thread.Sleep(100);
  lbs = new LoadBalanceServer();
  }
  }
  }
  return lbs;
  }
  public LobbyServer GetLobbyServer()
  {
  LobbyServer ls = serverList[0];
  for (int i = 1; i < SERVER_COUNT; i++)
  {
  if (serverList[i].PlayerList.Count < ls.PlayerList.Count)
  ls = serverList[i];
  }
  return ls;
  }
  public void ShowServerInfo()
  {
  foreach (LobbyServer ls in serverList)
  {
  Console.WriteLine("=================" + ls.ServerName + "=================");
  foreach (string player in ls.PlayerList)
  {
  Console.WriteLine(player);
  }
  }
  }
  }
  class LobbyServer
  {
  private List playerList = new List();
  public List PlayerList
  {
  get { return playerList; }
  }
  private string serverName;
  public string ServerName
  {
  get { return serverName; }
  }
  public LobbyServer(string serverName)
  {
  this.serverName = serverName;
  }
  public void EnterPlayer(string playerName)
  {
  playerList.Add(playerName);
  }
  }
  }



If you have any requirements, please contact webmaster。(如果有什么要求,请联系站长)





QQ:154298438
QQ:417480759