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

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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:

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->privatefunctionconnectionServer():void
{
varnc:NetConnection
=newNetConnection();
nc.connect(
"rtmp://localhost:1617/SOAPP","username","password")
nc.addEventListener(NetStatusEvent.NET_STATUS,onStatusHandler);
nc.client
=this;
}

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

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

privatefunctiononSyncHandler(event:SyncEvent):void
{
//..doother
}

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:

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->publicboolCreateSharedObject(IScopescope,stringname,boolpersistent)
{
ISharedObjectServiceservice
=(ISharedObjectService)ScopeUtils.GetScopeService(scope,typeof(ISharedObjectService));
returnservice.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:

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->ISharedObjectusers_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:

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->usingSystem;
usingSystem.Collections.Generic;
usingSystem.Text;
usingFluorineFx.Messaging.Adapter;
usingFluorineFx;
usingFluorineFx.Messaging.Api;
usingSystem.Diagnostics;
usingFluorineFx.Messaging.Api.SO;
usingFluorineFx.Exceptions;
usingFluorineFx.Context;
usingFluorineFx.Messaging.Api.Service;
usingSystem.Collections;
usingFx.Adapter.DTO;

namespaceFx.Adapter
{
///<summary>
///自定义ApplicationAdapter
///</summary>
[RemotingService]
publicclassMyApp:ApplicationAdapter
{
///<summary>
///应用程序启动
///</summary>
///<paramname="application"></param>
///<returns></returns>
publicoverrideboolAppStart(IScopeapplication)
{
Trace.WriteLine(
"应用程序启动");
returntrue;
}

///<summary>
///房间启动
///</summary>
///<paramname="room"></param>
///<returns></returns>
publicoverrideboolRoomStart(IScoperoom)
{
Trace.WriteLine(
"房间启动");
if(!base.RoomStart(room))
returnfalse;
returntrue;
}

///<summary>
///接收客户端的连接
///</summary>
///<paramname="connection"></param>
///<paramname="parameters"></param>
///<returns></returns>
publicoverrideboolAppConnect(IConnectionconnection,object[]parameters)
{
stringuserName=parameters[0]asstring;
stringpassword=parameters[1]asstring;

if(password==null||password==string.Empty)
thrownewClientRejectedException(null);

connection.Client.SetAttribute(
"userName",userName);
//获取共享对象(OnLineUsers)
ISharedObjectusers_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);
returntrue;
}

///<summary>
///加入房间
///</summary>
///<paramname="client"></param>
///<paramname="room"></param>
///<returns></returns>
publicoverrideboolRoomJoin(IClientclient,IScoperoom)
{
Trace.WriteLine(
"加入房间"+room.Name);
returntrue;
}

///<summary>
///离开房间
///</summary>
///<paramname="client"></param>
///<paramname="room"></param>
publicoverridevoidRoomLeave(IClientclient,IScoperoom)
{
Trace.WriteLine(
"离开房间"+room.Name);
base.RoomLeave(client,room);
}

///<summary>
///用户退出
///</summary>
///<paramname="connection"></param>
publicoverridevoidAppDisconnect(IConnectionconnection)
{
stringuserName=connection.Client.GetAttribute("userName")asstring;
ISharedObjectusers_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:

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />--><?xmlversion="1.0"encoding="utf-8"?>
<configuration>
<application-handlertype="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:

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />--><?xml version="1.0" encoding="utf-8" ?>
<services-config>

<channels>

<channel-definitionid="my-rtmp"class="mx.messaging.channels.RTMPChannel">
<endpointuri="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:

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:

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->privatefunctiononCallClient(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:

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->/**
*接受客户端呼叫---此方法必须是public修饰
*/
publicfunctiononSayMessage(message:Object):void
{
traceWriteln(message.toString());
}

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

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:

<!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />--><?xmlversion="1.0"encoding="utf-8"?>
<mx:Applicationxmlns: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[
importmx.controls.Alert;
importdotnet.fluorinefx.VO.UserInfo;

privatevarnc:NetConnection;
privatevarso:SharedObject;
privatevarinfo:UserInfo;

privatefunctionconnectionServer(event:MouseEvent):void
{
info
=newUserInfo();
info.UserName
=this.txtUserName.text;
info.Password
=this.txtPassword.text;

nc
=newNetConnection();
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();
}

privatefunctiononStatusHandler(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【<fontcolor=\"#4100b9\">"+info.UserName+"</font>】登陆了系统!");
}
}

privatefunctiononSyncHandler(event:SyncEvent):void
{
vartemp:Array
=newArray();
for(varu:Stringinso.data)
{
//traceWriteln("异步事件->共享对象:"+u+":"+so.data[u]);
temp.push(so.data[u]);
}
this.userList.dataProvider=temp;
}

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

privatefunctiononCallClient(message:String):void
{
so.send(
"onSayMessage",message);
}
/**
*接受客户端呼叫
*/
publicfunctiononSayMessage(message:Object):void
{
traceWriteln(message.toString());
}
]]
>
</mx:Script>
<mx:Labelx="24"y="134"id="connStatus"width="288"color="#FFFFFF"/>
<mx:Listx="342"y="10"height="347"width="160"id="userList">
</mx:List>
<mx:Formx="24"y="10"width="236">
<mx:FormItemlabel="用户名:"color="#FFFFFF">
<mx:TextInputid="txtUserName"width="130"color="#000000"/>
</mx:FormItem>
<mx:FormItemlabel="密码:"color="#FFFFFF">
<mx:TextInputid="txtPassword"width="130"
color
="#000000"displayAsPassword="true"/>
</mx:FormItem>
<mx:FormItemlabel="">
<mx:Buttonlabel="登陆服务器"click="connectionServer(event)"
enabled
="{this.txtUserName.text.length&gt;0?true:false}"color="#FFFFFF"/>
</mx:FormItem>
</mx:Form>
<mx:TextAreax="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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