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Flex与.NET互操作(十)：FluorineFx.Net的及时通信应用(Remote Shared Objects）

RIA技术 | 阅读(397) | 评论(0)
Aug
7
2009
      远程共享对象(Remote Shared Objects) 可以用来跟踪、存储、共享以及做多客户端的数据同步操作。只要共享对象上的数据发生了改变，将会把最新数据同步到所有连接到该共享对象的应用程序客户端。FluorineFx所提供的远程共享对象(Remote Shared Objects)和FMS的共享对象的功能是一样，对于熟悉FMS开发的朋友来说,学习FluorineFx的远程共享对象是非常简单的。

      共享对象可以在服务器端创建，也可以在客户端创建。在客户端创建共享对象的方法和使用FMS开发是一样的，创建一个NetConnection对象，通过该对象的connect()方法连接到服务器，然后通过SharedObject.getRemote()方法就可以在客户端创建一个远程共享对象。如下实例代码：

private function connectionServer():void
{
    var nc:NetConnection = new NetConnection();
    nc.connect("rtmp://localhost:1617/SOAPP","username","password")
    nc.addEventListener(NetStatusEvent.NET_STATUS,onStatusHandler);
    nc.client = this;
}

private function onStatusHandler(event:NetStatusEvent):void
{
    if(event.info.code == "NetConnectin.Connect.Success")
    {
        createSharedObject();
    }
}

private function createSharedObject():void
{
    var so:SharedObject = SharedObject.getRemote("OnLineUsers",nc.uri,false);
    so.addEventListener(SyncEvent.SYNC,onSyncHandler);
    so.connect(this.nc);
    so.client = this;
}

private function onSyncHandler(event:SyncEvent):void
{
  //...do other
}


      在FluorineFx的服务器端创建远程共享对象和FMS有很大的区别，FluorineFx的ISharedObjectService接口提供了专门用于创建远程共享对象的方法CreateSharedObject()，ApplicationAdapter实现了此接口方法。定义如下：

public bool CreateSharedObject(IScope scope, string name, bool persistent)
{
      ISharedObjectService service = (ISharedObjectService)ScopeUtils.GetScopeService(scope, typeof(ISharedObjectService));
      return service.CreateSharedObject(scope, name, persistent);
}



      如果要在服务器端创建远程共享对象，直接调用ApplicationAdapter类中的CreateSharedObject()方法就可以。如下在FluorineFx服务器端创建远程共享对象的代码块：

ISharedObject users_so = GetSharedObject(connection.Scope, "OnLineUsers");
if (users_so == null)
{
       //创建共享对象
        CreateSharedObject(connection.Scope, "OnLineUsers", false);
        users_so = GetSharedObject(connection.Scope, "OnLineUsers");
}


      要想更新共享对象里的数据客户端还是使用setProperty()方法，而FluorineFx的服务器更新共享对象的方法则与FMS不一样，使用的是FluorineFx.Messaging.Api.IAttributeStore接口提供的SetAttribute()和RemoveAttribute()方法来更新共享对象里的数据。

      陆续介绍了这么多，下面通过一个案例来看看该这么去应用远程共享对象。比如做IM、视频聊天、视频会议等及时通信类型的应用中，用户上线下线的频率非常高，这时候我们就可以使用远程共享对象去做在线用户的数据同步。

      首先建立FluorineFx服务库，并建立一个应用类继承于ApplicationAdapter,通过重写ApplicationAdapter的相关方法来实现应用程序的不同需求，详细如下代码块：

using System;
using System.Collections.Generic;
using System.Text;
using FluorineFx.Messaging.Adapter;
using FluorineFx;
using FluorineFx.Messaging.Api;
using System.Diagnostics;
using FluorineFx.Messaging.Api.SO;
using FluorineFx.Exceptions;
using FluorineFx.Context;
using FluorineFx.Messaging.Api.Service;
using System.Collections;
using Fx.Adapter.DTO;

namespace Fx.Adapter
{
    /// <summary>
    /// 自定义ApplicationAdapter
    /// </summary>
    [RemotingService]
    public class MyApp : ApplicationAdapter
    {
        /// <summary>
        /// 应用程序启动
        /// </summary>
        /// <param name="application"></param>
        /// <returns></returns>
        public override bool AppStart(IScope application)
        {
            Trace.WriteLine("应用程序启动");
            return true;
        }

        /// <summary>
        /// 房间启动
        /// </summary>
        /// <param name="room"></param>
        /// <returns></returns>
        public override bool RoomStart(IScope room)
        {
            Trace.WriteLine("房间启动");
            if (!base.RoomStart(room))
                return false;
            return true;
        }

        /// <summary>
        /// 接收客户端的连接
        /// </summary>
        /// <param name="connection"></param>
        /// <param name="parameters"></param>
        /// <returns></returns>
        public override bool AppConnect(IConnection connection, object[] parameters)
        {
            string userName = parameters[0] as string;
            string password = parameters[1] as string;

            if (password == null || password == string.Empty)
                throw new ClientRejectedException(null);

            connection.Client.SetAttribute("userName", userName);
            //获取共享对象(OnLineUsers)
            ISharedObject users_so = GetSharedObject(connection.Scope, "OnLineUsers");
            if (users_so == null)
            {
                //创建共享对象
                CreateSharedObject(connection.Scope, "OnLineUsers", false);
                users_so = GetSharedObject(connection.Scope, "OnLineUsers");
            }
            //更新共享对象
            users_so.SetAttribute(userName, userName);
            return true;
        }

        /// <summary>
        /// 加入房间
        /// </summary>
        /// <param name="client"></param>
        /// <param name="room"></param>
        /// <returns></returns>
        public override bool RoomJoin(IClient client, IScope room)
        {
            Trace.WriteLine("加入房间 " + room.Name);
            return true;
        }

        /// <summary>
        /// 离开房间
        /// </summary>
        /// <param name="client"></param>
        /// <param name="room"></param>
        public override void RoomLeave(IClient client, IScope room)
        {
            Trace.WriteLine("离开房间 " + room.Name);
            base.RoomLeave(client, room);
        }

        /// <summary>
        /// 用户退出
        /// </summary>
        /// <param name="connection"></param>
        public override void AppDisconnect(IConnection connection)
        {
            string userName = connection.Client.GetAttribute("userName") as string;
            ISharedObject users_so = GetSharedObject(connection.Scope, "OnLineUsers");
            if (users_so != null)
            {
                //从共享对象中移除当前退出系统用户
                users_so.RemoveAttribute(userName);
            }
            base.AppDisconnect(connection);
        }
    }
}


      开发好了ApplicationAdapter，还需要对此ApplicationAdapter进行通信配置，在FluorineFx的应用程序目录中添加app.config并进行如下配置：

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <application-handler type="Fx.Adapter.MyApp"/>
</configuration>



      另外还需要配置一个客户端方法的通信通道，通过FluorineFx网站下的WEB-INF/flex/service-config.xml配置：

<?xml version="1.0" encoding="utf-8" ?>
<services-config>

      <channels>

          <channel-definition id="my-rtmp" class="mx.messaging.channels.RTMPChannel">
               <endpoint uri="rtmp://{server.name}:1617" class="flex.messaging.endpoints.RTMPEndpoint"/>
          </channel-definition>

      </channels>

</services-config>


      如上便完成了服务器端的开发，在flash/felx客户端通过NetConnection去连接应用，并根据当前的连接去连接服务器端的远程共享对象，最后通过异步事件来实现数据同步更新。如下程序运行截图：
点击在新窗口中浏览此图片
      此时开多个浏览器窗口测试，不同窗口使用不同的用户名登录，可以很清楚的看到，我们已经实现了在线用户的数据同步功能，可以及时的反映用户上线离线，可以及时的同步在线用户列表的数据。

      另外远程共享对象还有一个功能非常强大的特性方法，就是连接到共享对象的客户端之间可以直接广播消息（客户端调用客户端的方法）。就以上面在线用户的案例为例，用户成功登陆服务器我需要广播一条消息，用户退出了我也需要广播一条消息，要实现这个功能就需要通过远程共享的客户端呼叫(send()方法)来实现，如下代码块：

private function onCallClient(message:String):void
{
    so.send("onSayMessage",message);
}
      

      远程共享对象的send()方法调用了onSayMessage这个客户端方法来实现对连接到共享对象上的所有客户端广播消息，那么我们的在定义一个onSayMessage方法，如下：

/**
* 接受客户端呼叫---此方法必须是public修饰
*/
public function onSayMessage(message:Object):void
{
    traceWriteln(message.toString());
}

private function traceWriteln(param:String):void
{
   txtTraceArea.htmlText += param + "\n";
   txtTraceArea.validateNow();
   txtTraceArea.verticalScrollPosition = txtTraceArea.maxVerticalScrollPosition;
}


点击在新窗口中浏览此图片

      如果想实现用户退出广播，可以通过服务器端RPC的方法调用客户端的方法来实现，关于RPC请查看上一篇教程，有详细介绍。下面是Flex客户端的完整代码：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"  
    width="530" height="378" backgroundGradientAlphas="[1.0, 1.0]"
    backgroundGradientColors="[#000000, #686868]" fontSize="12">
    <mx:Script>
        <![CDATA[
            import mx.controls.Alert;
            import dotnet.fluorinefx.VO.UserInfo;
            
            private var nc:NetConnection;
            private var so:SharedObject;
            private var info:UserInfo;
            
            private function connectionServer(event:MouseEvent):void
            {
                info = new UserInfo();
                info.UserName = this.txtUserName.text;
                info.Password = this.txtPassword.text;
                
                nc = new NetConnection();
                nc.connect("rtmp://localhost:1617/SOAPP",info.UserName,info.Password);
                nc.addEventListener(NetStatusEvent.NET_STATUS,onStatusHandler);
                nc.client = this;
                
                this.txtUserName.text="";
                this.txtPassword.text="";
                this.txtUserName.setFocus();
            }
            
            private function onStatusHandler(event:NetStatusEvent):void
            {
                this.connStatus.text = "连接状态：" + event.info.code;
                if(event.info.code == "NetConnection.Connect.Success")
                {
                    //连接远程共享对象
                    so = SharedObject.getRemote("OnLineUsers",nc.uri,false);
                    if(so)
                    {
                        so.addEventListener(SyncEvent.SYNC,onSyncHandler);
                        so.connect(nc);
                        so.client = this;
                    }
                    onCallClient("用户【 <font color=\"#4100b9\">"+info.UserName+"</font>】登陆了系统！");
                }
            }
            
            private function onSyncHandler(event:SyncEvent):void
            {
                var temp:Array = new Array();
                for(var u:String in so.data)
                {
                    //traceWriteln("异步事件->共享对象：" + u + ":" + so.data[u]);
                    temp.push(so.data[u]);
                }
                this.userList.dataProvider = temp;
            }
            
            private function traceWriteln(param:String):void
            {
                txtTraceArea.htmlText += param + "\n";
                txtTraceArea.validateNow();
                txtTraceArea.verticalScrollPosition = txtTraceArea.maxVerticalScrollPosition;
            }
            
            private function onCallClient(message:String):void
            {
                so.send("onSayMessage",message);
            }
            /**
             * 接受客户端呼叫
             */
            public function onSayMessage(message:Object):void
            {
                traceWriteln(message.toString());
            }
        ]]>
    </mx:Script>
    <mx:Label x="24" y="134" id="connStatus" width="288" color="#FFFFFF"/>
    <mx:List x="342" y="10" height="347" width="160" id="userList" >
    </mx:List>
    <mx:Form x="24" y="10" width="236">
        <mx:FormItem label="用户名：" color="#FFFFFF">
            <mx:TextInput id="txtUserName" width="130" color="#000000"/>
        </mx:FormItem>
        <mx:FormItem label="密  码：" color="#FFFFFF">
            <mx:TextInput id="txtPassword" width="130"
                color="#000000" displayAsPassword="true"/>
        </mx:FormItem>
        <mx:FormItem label="">
            <mx:Button label="登陆服务器" click="connectionServer(event)"
                enabled="{this.txtUserName.text.length&gt;0?true:false}" color="#FFFFFF"/>
        </mx:FormItem>
    </mx:Form>
    <mx:TextArea x="24" y="174" width="288" height="153" alpha="1.0"
        backgroundColor="#F2D2D2" backgroundAlpha="0.26" color="#FFFFFF"
        id="txtTraceArea" borderColor="#FFFFFF"/>
</mx:Application>



            

出处：Bēniaǒ成长笔记
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