Flex与.NET互操作(十二):FluorineFx.Net的及时通信应用(Remote Shared Objects)(三)

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
{
    
///  
    
///  自定义ApplicationAdapter
    
///  

    [RemotingService]
    
public   class  MyApp : ApplicationAdapter
    {
        
///  
        
///  应用程序启动
        
///  

        
///  
        
///  
         public   override   bool  AppStart(IScope application)
        {
            Trace.WriteLine(
" 应用程序启动 " );
            
return   true ;
        }

        
///  
        
///  房间启动
        
///  

        
///  
        
///  
         public   override   bool  RoomStart(IScope room)
        {
            Trace.WriteLine(
" 房间启动 " );
            
if  ( ! base .RoomStart(room))
                
return   false ;
            
return   true ;
        }

        
///  
        
///  接收客户端的连接
        
///  

        
///  
        
///  
        
///  
         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 ;
        }

        
///  
        
///  加入房间
        
///  

        
///  
        
///  
        
///  
         public   override   bool  RoomJoin(IClient client, IScope room)
        {
            Trace.WriteLine(
" 加入房间  "   +  room.Name);
            
return   true ;
        }

        
///  
        
///  离开房间
        
///  

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

        
///  
        
///  用户退出
        
///  

        
///  
         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:


      

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

      

      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:

            Flex与.NET互操作(十二):FluorineFx.Net的及时通信应用(Remote Shared Objects)(三)_第1张图片 

      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;
}

            Flex与.NET互操作(十二):FluorineFx.Net的及时通信应用(Remote Shared Objects)(三)_第2张图片

      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《Flex与.NET互操作(十一):基于FluorineFx.Net的及时通信应用(Remote Procedure Call)(二) 》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【  " #4100b9\ " > " + info.UserName + " 】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>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 >
       }
            }

             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>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 >

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