我有一个使用p2p的消息传递系统。每个对等体都有一个传入消息列表和一个传出消息列表。 我需要做的是每当新的对等体加入网格时，他将从其他对等体获得所有传入的消息，并将它们添加到它自己的传入消息列表中。现在我知道当我收到其他同行信息时，我可以让他们给我自己的清单。但我找不到怎样的方式......？ 任何关于此或帮助的建议都将受到高度赞赏。我在下面给出了我的代码。
#region Instance Fields
private string strOrigin = "";
//the chat member name
private string m_Member;
//the channel instance where we execute our service methods against
private IServerChannel m_participant;
//the instance context which in this case is our window since it is the service host
private InstanceContext m_site;
//our binding transport for the p2p mesh
private NetPeerTcpBinding m_binding;
//the factory to create our chat channel
private ChannelFactory<IServerChannel> m_channelFactory;
//an interface provided by the channel exposing events to indicate
//when we have connected or disconnected from the mesh
private IOnlineStatus o_statusHandler;
//a generic delegate to execute a thread against that accepts no args
private delegate void NoArgDelegate();
//an object to hold user details
private IUserService userService;
//an Observable Collection of object to get all the Application Instance Details in databas
ObservableCollection<AppLoginInstance> appLoginInstances;
// an Observable Collection of object to get all Incoming Messages types
ObservableCollection<MessageType> inComingMessageTypes;
// an Observable Collection of object to get all Outgoing Messages
ObservableCollection<PDCL.ERP.DataModels.Message> outGoingMessages;
// an Observable Collection of object to get all Incoming Messages
ObservableCollection<PDCL.ERP.DataModels.Message> inComingMessages;
//an Event Aggregator to publish event for other modules to subscribe
private readonly IEventAggregator eventAggregator;
/// <summary>
/// an IUnityCOntainer to get the container
/// </summary>
private IUnityContainer container;
private RefreshConnectionStatus refreshConnectionStatus;
private RefreshConnectionStatusEventArgs args;
private ReplyRequestMessage replyMessageRequest;
private ReplyRequestMessageEventArgs eventsArgs;
#endregion
public P2pMessageService(IUserService UserService, IEventAggregator EventAggregator, IUnityContainer container)
{
userService = UserService;
this.container = container;
appLoginInstances = new ObservableCollection<AppLoginInstance>();
inComingMessageTypes = new ObservableCollection<MessageType>();
inComingMessages = new ObservableCollection<PDCL.ERP.DataModels.Message>();
outGoingMessages = new ObservableCollection<PDCL.ERP.DataModels.Message>();
this.args = new RefreshConnectionStatusEventArgs();
this.eventsArgs = new ReplyRequestMessageEventArgs();
this.eventAggregator = EventAggregator;
this.refreshConnectionStatus = this.eventAggregator.GetEvent<RefreshConnectionStatus>();
this.replyMessageRequest = this.eventAggregator.GetEvent<ReplyRequestMessage>();
}
#region IOnlineStatus Event Handlers
void ostat_Offline(object sender, EventArgs e)
{
// we could update a status bar or animate an icon to
//indicate to the user they have disconnected from the mesh
//currently i don't have a "disconnect" button but adding it
//should be trivial if you understand the rest of this code
}
void ostat_Online(object sender, EventArgs e)
{
try
{
m_participant.Join(userService.AppInstance);
}
catch (Exception Ex)
{
Logger.Exception(Ex, Ex.TargetSite.Name + ": " + Ex.TargetSite + ": " + Ex.Message);
}
}
#endregion
#region IServer Members
//this method gets called from a background thread to
//connect the service client to the p2p mesh specified
//by the binding info in the app.config
public void ConnectToMesh()
{
try
{
m_site = new InstanceContext(this);
//use the binding from the app.config with default settings
m_binding = new NetPeerTcpBinding("P2PMessageBinding");
m_channelFactory = new DuplexChannelFactory<IServerChannel>(m_site, "P2PMessageEndPoint");
m_participant = m_channelFactory.CreateChannel();
o_statusHandler = m_participant.GetProperty<IOnlineStatus>();
o_statusHandler.Online += new EventHandler(ostat_Online);
o_statusHandler.Offline += new EventHandler(ostat_Offline);
//m_participant.InitializeMesh();
//this.appLoginInstances.Add(this.userService.AppInstance);
BackgroundWorkerHelper.DoWork<object>(() =>
{
//this is an empty unhandled method on the service interface.
//why? because for some reason p2p clients don't try to connect to the mesh
//until the first service method call. so to facilitate connecting i call this method
//to get the ball rolling.
m_participant.InitializeMesh();
//SynchronizeMessage(this.inComingMessages);
return new object();
}, arg =>
{
});
this.appLoginInstances.Add(this.userService.AppInstance);
}
catch (Exception Ex)
{
Logger.Exception(Ex, Ex.TargetSite.Name + ": " + Ex.TargetSite + ": " + Ex.Message);
}
}
public void Join(AppLoginInstance obj)
{
try
{
// Adding Instance to the PeerList
if (appLoginInstances.SingleOrDefault(a => a.InstanceId == obj.InstanceId)==null)
{
appLoginInstances.Add(obj);
this.refreshConnectionStatus.Publish(new RefreshConnectionStatusEventArgs() { Status = m_channelFactory.State });
}
//this will retrieve any new members that have joined before the current user
m_participant.SynchronizeMemberList(userService.AppInstance);
}
catch(Exception Ex)
{
Logger.Exception(Ex,Ex.TargetSite.Name + ": " + Ex.TargetSite + ": " + Ex.Message);
}
}
/// <summary>
/// Synchronizes member list
/// </summary>
/// <param name="obj">The AppLoginInstance Param</param>
public void SynchronizeMemberList(AppLoginInstance obj)
{
//as member names come in we simply disregard duplicates and
//add them to the member list, this way we can retrieve a list
//of members already in the chatroom when we enter at any time.
//again, since this is just an example this is the simplified
//way to do things. the correct way would be to retrieve a list
//of peernames and retrieve the metadata from each one which would
//tell us what the member name is and add it. we would want to check
//this list when we join the mesh to make sure our member name doesn't
//conflict with someone else
try
{
if (appLoginInstances.SingleOrDefault(a => a.InstanceId == obj.InstanceId) == null)
{
appLoginInstances.Add(obj);
}
}
catch (Exception Ex)
{
Logger.Exception(Ex, Ex.TargetSite.Name + ": " + Ex.TargetSite + ": " + Ex.Message);
}
}
/// <summary>
/// This methos broadcasts the mesasge to all peers.
/// </summary>
/// <param name="msg">The whole message which is to be broadcasted</param>
/// <param name="securityLevels"> Level of security</param>
public void BroadCastMsg(PDCL.ERP.DataModels.Message msg, List<string> securityLevels)
{
try
{
foreach (string s in securityLevels)
{
if (this.userService.IsInRole(s))
{
if (this.inComingMessages.Count == 0 && msg.CreatedByApp != this.userService.AppInstanceId)
{
this.inComingMessages.Add(msg);
}
else if (this.inComingMessages.SingleOrDefault(a => a.MessageId == msg.MessageId) == null && msg.CreatedByApp != this.userService.AppInstanceId)
{
this.inComingMessages.Add(msg);
}
}
}
}
catch (Exception Ex)
{
Logger.Exception(Ex, Ex.TargetSite.Name + ": " + Ex.TargetSite + ": " + Ex.Message);
}
}
/// <summary>
///
/// </summary>
/// <param name="msg">The Message to denyed</param>
public void BroadCastReplyMsg(PDCL.ERP.DataModels.Message msg)
{
try
{
//if (this.inComingMessages.SingleOrDefault(a => a.MessageId == msg.MessageId) != null)
//{
this.replyMessageRequest.Publish(new ReplyRequestMessageEventArgs() { Message = msg });
this.inComingMessages.Remove(this.inComingMessages.SingleOrDefault(o => o.MessageId == msg.MessageId));
//}
}
catch (Exception ex)
{
Logger.Exception(ex, ex.TargetSite.Name + ": " + ex.TargetSite + ": " + ex.Message);
}
}
//again we need to sync the worker thread with the UI thread via Dispatcher
public void Whisper(string Member, string MemberTo, string Message)
{
}
public void InitializeMesh()
{
//do nothing
}
public void Leave(AppLoginInstance obj)
{
if (this.appLoginInstances.SingleOrDefault(a => a.InstanceId == obj.InstanceId) != null)
{
this.appLoginInstances.Remove(this.appLoginInstances.Single(a => a.InstanceId == obj.InstanceId));
}
}
//public void SynchronizeRemoveMemberList(AppLoginInstance obj)
//{
// if (appLoginInstances.SingleOrDefault(a => a.InstanceId == obj.InstanceId) != null)
// {
// appLoginInstances.Remove(obj);
// }
//}
#endregion
答案 0 :(得分：0)
WCF中的p2p协议本质上是广播协议。向特定对等方发送消息的唯一方法是获取它的地址并通过不同的绑定与它通信。这样做的问题是，如果对等体加入，则所有当前节点都希望连接到它以更新列表。
您必须在单独的绑定上创建单独的方法，以便客户端可以检索列表。
可以在PeerChannel Blog上找到更多信息，可以找到特定于同步的信息here。这种方法主要取决于网格的大小，消息的大小以及消息的内容。
例如，如果您的消息相对较小并且具有唯一标识符，那么您可以使用跳数1重新传输网格上的消息，这意味着某些节点将重新接收消息。
或者，您可以发送包含具有大量消息的节点的IP地址的消息，并使用另一个WCF连接（例如basicHttpBinding）到网格，然后任何需要消息的计算机都可以连接到其中一个节点。