The Internet Communications Engine (Ice) 跨平台异构通讯方案 第二弹-Hello world！

 　　如果不知道ICE是什么的同学，请看上一篇的ICE简介：http://www.cnblogs.com/winds/p/3864677.html

 　　好了，HelloWorld，从中间语言讲起。

　　首先，我们新建一个控制台项目，添加一个txt文件，在其中写上中间语言代码：

#ifndef HELLO_ICE
#define HELLO_ICE

module Demo
{

interface Hello
{
    void sayHello(int delay);
    void shutdown();
};

};

#endif

这是一段很简单的代码，其中

#ifndef HELLO_ICE
#define HELLO_ICE

#endif

这是ICE的一个的规范而已，必须要加，否则接下来的编译器会通不过。这个语法和.Net的条件编译不一样，更多的像C中的代码风格。

module Demo
{
}

对应的是.net中的命名空间

interface Hello
{
    void sayHello(int delay);
    void shutdown();
};

这个是一个简单的接口。简单的介绍完后，接下来的我们把txt后缀改为.ice后缀。

接下来，右键项目：

将EnableBuilder勾上，接下来ICE会自动帮我们生成Hello.cs文件：

好了，这个Hello.cs文件有我们定义好的被编译为C#的接口，接下里我们开始让服务端实现接口：

public class HelloI : HelloDisp_
{
    public override void sayHello(int delay, Ice.Current current)
    {
        if(delay > 0)
        {
            System.Threading.Thread.Sleep(delay);
        }
        System.Console.Out.WriteLine("Hello World!");
    }
    
    public override void shutdown(Ice.Current current)
    {
        System.Console.Out.WriteLine("Shutting down...");
        current.adapter.getCommunicator().shutdown();
    }
}

其中HelloDisp_为Hello.cs文件中被编译为C#了的一个抽象类，我们实现接口，接下来，我们了解一下ICE的基本配置（好吧，又是配置），不过这个配置比起WCF简单多了：

Hello.Endpoints=tcp -p 10000:udp -p 10000

当然我们要新建一个配置文件，名字可以随便取。这里我取的名字为：config.server 放在项目的根目录下：

接下来，写服务端：

public class Server
{
    class App : Ice.Application
    {
        public override int run(string[] args)
        {
            if(args.Length > 0)
            {
                System.Console.Error.WriteLine(appName() + ": too many arguments");
                return 1;
            }

            Ice.ObjectAdapter adapter = communicator().createObjectAdapter("Hello");
            adapter.add(new HelloI(), communicator().stringToIdentity("hello"));
            adapter.activate();
            communicator().waitForShutdown();
            return 0;
        }
    }

    public static int Main(string[] args)
    {
        App app = new App();
        app.main(args, "config.server");return 1;
    }
}

OK了，服务端写完了，接下来写客户端：

public class Client
{
    public class App : Ice.Application
    {
        private static void menu()
        {
            Console.Write(
                "usage:
" +
                "t: send greeting as twoway
" +
                "o: send greeting as oneway
" +
                "O: send greeting as batch oneway
" +
                "d: send greeting as datagram
" +
                "D: send greeting as batch datagram
" +
                "f: flush all batch requests
" +
                "T: set a timeout
" +
                "P: set a server delay");
            if(_haveSSL)
            {
                Console.Write("
S: switch secure mode on/off");
            }
            Console.WriteLine(
                "
s: shutdown server
" +
                "x: exit
" +
                "?: help
");
        }

        public override int run(string[] args)
        {
            if(args.Length > 0)
            {
                Console.Error.WriteLine(appName() + ": too many arguments");
                return 1;
            }

            try
            {
                communicator().getPluginManager().getPlugin("IceSSL");
                _haveSSL = true;
            }
            catch(Ice.NotRegisteredException)
            {
            }

            HelloPrx twoway = HelloPrxHelper.checkedCast(
                communicator().propertyToProxy("Hello.Proxy").ice_twoway().ice_timeout(-1).ice_secure(false));
            if(twoway == null)
            {
                Console.Error.WriteLine("invalid proxy");
                return 1;
            }
            HelloPrx oneway = (HelloPrx)twoway.ice_oneway();
            HelloPrx batchOneway = (HelloPrx)twoway.ice_batchOneway();
            HelloPrx datagram = (HelloPrx)twoway.ice_datagram();
            HelloPrx batchDatagram =(HelloPrx)twoway.ice_batchDatagram();

            bool secure = false;
            int timeout = -1;
            int delay = 0;

            menu();

            string line = null;
            do 
            {
                try
                {
                    Console.Out.Write("==> ");
                    Console.Out.Flush();
                    line = Console.In.ReadLine();
                    if(line == null)
                    {
                        break;
                    }
                    if(line.Equals("t"))
                    {
                        twoway.sayHello(delay);
                    }
                    else if(line.Equals("o"))
                    {
                        oneway.sayHello(delay);
                    }
                    else if(line.Equals("O"))
                    {
                        batchOneway.sayHello(delay);
                    }
                    else if(line.Equals("d"))
                    {
                        if(secure)
                        {
                            Console.WriteLine("secure datagrams are not supported");
                        }
                        else
                        {
                            datagram.sayHello(delay);
                        }
                    }
                    else if(line.Equals("D"))
                    {
                        if(secure)
                        {
                            Console.WriteLine("secure datagrams are not supported");
                        }
                        else
                        {
                            batchDatagram.sayHello(delay);
                        }
                    }
                    else if(line.Equals("f"))
                    {
                        communicator().flushBatchRequests();
                    }
                    else if(line.Equals("T"))
                    {
                        if(timeout == -1)
                        {
                            timeout = 2000;
                        }
                        else
                        {
                            timeout = -1;
                        }
                        
                        twoway = (HelloPrx)twoway.ice_timeout(timeout);
                        oneway = (HelloPrx)oneway.ice_timeout(timeout);
                        batchOneway = (HelloPrx)batchOneway.ice_timeout(timeout);
                        
                        if(timeout == -1)
                        {
                            Console.WriteLine("timeout is now switched off");
                        }
                        else
                        {
                            Console.WriteLine("timeout is now set to 2000ms");
                        }
                    }
                    else if(line.Equals("P"))
                    {
                        if(delay == 0)
                        {
                            delay = 2500;
                        }
                        else
                        {
                            delay = 0;
                        }
                        
                        if(delay == 0)
                        {
                            Console.WriteLine("server delay is now deactivated");
                        }
                        else
                        {
                            Console.WriteLine("server delay is now set to 2500ms");
                        }
                    }
                    else if(_haveSSL && line.Equals("S"))
                    {
                        secure = !secure;

                        twoway = (HelloPrx)twoway.ice_secure(secure);
                        oneway = (HelloPrx)oneway.ice_secure(secure);
                        batchOneway = (HelloPrx)batchOneway.ice_secure(secure);
                        datagram = (HelloPrx)datagram.ice_secure(secure);
                        batchDatagram = (HelloPrx)batchDatagram.ice_secure(secure);

                        if(secure)
                        {
                            Console.WriteLine("secure mode is now on");
                        }
                        else
                        {
                            Console.WriteLine("secure mode is now off");
                        }
                    }
                    else if(line.Equals("s"))
                    {
                        twoway.shutdown();
                    }
                    else if(line.Equals("x"))
                    {
                        // Nothing to do
                    }
                    else if(line.Equals("?"))
                    {
                        menu();
                    }
                    else
                    {
                        Console.WriteLine("unknown command `" + line + "'");
                        menu();
                    }
                }
                catch(System.Exception ex)
                {
                    Console.Error.WriteLine(ex);
                }
            }
            while (!line.Equals("x"));
            
            return 0;
        }

        private static bool _haveSSL = false;
    }

    public static int Main(string[] args)
    {
        App app = new App();
        return app.main(args, "config.client");
    }
}

从这个客户端明眼人应该能看出不少东西，以后再依此介绍。当然客户端文件配置：

Hello.Proxy=hello:tcp -p 10000:udp -p 10000
Ice.Default.Host=192.168.1.103

好了，启动服务端和运行客户端，效果如下：

Hello world完成。源码奉上：http://files.cnblogs.com/winds/hello.zip