//回调总入口点，根据客户端动作通知对应客户端执行对应的操作
private void MyEventHandler(object sender, ChatEventArgs e)
{
try
{
switch (e.MessageType)
{
case MessageType.UserLeave:
m_Callback.UserLeave(e.User);
break;
case MessageType.SendMessage:
m_Callback.ShowMessage(e.Message, e.User);
break;
}
}
catch
{
Leave(e.User);
}
}
/// <summary>
/// 发送消息
/// </summary>
/// <param name="message"></param>
/// <param name="userFrom"></param>
/// <param name="userTo"></param>
public void SendMessage(string message, CommunicationUser userFrom, CommunicationUser userTo)
{
//给指定的用户发送消息
ChatEventArgs e = new ChatEventArgs();
e.MessageType = MessageType.UserLeave;
e.User = userTo;
e.Message = userFrom.UserName + ": " + message;
//循环将在线的用户广播信息
var users = (m_CurrentOnLineUsers.Where((pair) => { return(pair.ToString() == userTo.ToString()); })).ToList();
users.ForEach((pair) =>
{
pair.Value.GetInvocationList().ToList().ForEach((handler) =>
{
((CommunicationEventHandler)handler).BeginInvoke(this, e, null, null);
});
});
}
/// <summary>
/// 记录加入的客户端的用户,用于单点登录
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
void Join1(CommunicationUser user)
{
try
{
bool userAdded = false;
lock (m_SyncObjForOnlyOneLoginUsers)//线程的同步性，同步访问多个线程的任何变量，利用lock(独占锁)，确保数据访问的唯一性。
{
//同一个用户、同一台电脑、同一个进程的重复请求不用处理
//if ((m_OnlyOneLoginUsers.Where((pair) => { return pair.Key.ToString() == user.ToString(); })).Count() > 0) return;
if (m_OnlyOneLoginUsers.Keys.Contains(user))
{
return;
}
//向已经登录的用户发送消息
//foreach (CommunicationUser key in m_OnlyOneLoginUsers.Keys)
for (int i = m_OnlyOneLoginUsers.Count() - 1; i >= 0; i--)
{
CommunicationUser key = m_OnlyOneLoginUsers.Keys.ElementAt(i);
//只能向以当前用户账号登录系统的用户发送消息
if (key.UserID == user.UserID && key.UserName == user.UserName && m_OnlyOneLoginUsers[key] != null)
{
//给其他用户发送需要退出系统的消息
ChatEventArgs e = new ChatEventArgs();
e.MessageType = MessageType.UserLeave;
e.User = key;
//循环将在线的用户广播信息
foreach (CommunicationEventHandler handler in m_OnlyOneLoginUsers[key].GetInvocationList())
{
//异步方式调用多路广播委托的调用列表中的ChatEventHandler
handler.BeginInvoke(this, e, null, null);
}
//发送完成后移除用户
m_OnlyOneLoginUsers.Remove(key);
RemoveUserInDGV(key);
}
}
//记录下当前登录的用户
//if ((m_OnlyOneLoginUsers.Where((pair) => { return pair.Key.ToString() == user.ToString(); })).Count() == 0)
if (!m_OnlyOneLoginUsers.Keys.Contains(user))
{
m_OnlyOneLoginUsers.Add(user, MyEventHandler);
userAdded = true;
AddUserInDGV(user);
}
}
if (userAdded)
{
//获取当前操作客户端实例的通道给IChatCallback接口的实例callback,此通道是一个定义为IChatCallback类型的泛类型,通道的类型是事先服务契约协定好的双工机制。
m_Callback = OperationContext.Current.GetCallbackChannel <ICommunicationCallback>();
}
}
catch (Exception ex)
{
throw ex;
}
}
