program.cs

这是asp.net^和Visual C++Sharp编写的串并口通讯的书籍 源代码

using System;
using System.Collections.Generic;
using System.Text;

using System.Threading;
using System.Collections;

namespace _1
{
    class LoadBalancer
    {
        private static LoadBalancer Balancer;
        private ArrayList ArrayList_Server = new ArrayList();
        private Random random = new Random();

        protected LoadBalancer()
        {
            ArrayList_Server.Add("服务器I");
            ArrayList_Server.Add("服务器II");
            ArrayList_Server.Add("服务器III");
            ArrayList_Server.Add("服务器IV");
            ArrayList_Server.Add("服务器V");
        }

        public static LoadBalancer GetLoadBalancer()
        {
            if (Balancer == null)
            {
                Mutex mutex = new Mutex();
                mutex.WaitOne();
                if (Balancer == null)
                    Balancer = new LoadBalancer();
                mutex.Close();
            }
            return Balancer;
        }
        public string Server
        {
            get
            {
                int r = random.Next(ArrayList_Server.Count);
                return ArrayList_Server[r].ToString();
            }
        }
    }

    /**/
    /// <summary>
    /// SingletonApp test
    /// </summary>
    ///
    public class SingletonApp
    {
        public static void Main(string[] args)
        {
            LoadBalancer b1 = LoadBalancer.GetLoadBalancer();
            LoadBalancer b2 = LoadBalancer.GetLoadBalancer();
            LoadBalancer b3 = LoadBalancer.GetLoadBalancer();
            LoadBalancer b4 = LoadBalancer.GetLoadBalancer();

            // Same instance?
            if ((b1 == b2) && (b2 == b3) && (b3 == b4))
                Console.WriteLine("同步运行相同的实例对象");

            // Do the load balancing
            Console.WriteLine(b1.Server);
            Console.WriteLine(b2.Server);
            Console.WriteLine(b3.Server);
            Console.WriteLine(b4.Server);
        }
    }
}