管理signalR通知以同步客户端和服务器(c#)

在我的web应用程序中，我想从服务器上加载所有数据到客户端。在那之后，我希望所有的通信都通过Signalr进行管理-这意味着每次更新服务器都会向所有客户端发送通知，并且他们会请求更新的数据。

但是，当SingalR连接损坏然后返回时，我不知道该怎么办。我不想重新加载所有数据。我想做的是在服务器端为每个断开连接的客户端实现某种通知管理，每当SignalR连接再次建立时-将他错过的所有通知推送到该特定客户端。

我们在客户端的signalR监听器是单例监听器，而不是短寿命控制器，这样我们就可以防止每次视图更改时都有GET请求，使应用程序更快，更用户友好。由于这种方法，后台的新通知也会得到处理，即使它与最终用户所在的当前视图无关，就像这样:

// This service is initialized once only
public class Service1 {
        static inject = ['$rootScope']
    array : Item[];
    // This is a singleton!
    public constructor ($rootScope){
        // Get all items from the server
        GetAllItemsFromServer();
        // Listener for signalR updates
        var listener = $rootScope.$on("ItemsNotificationFromServer", UpdateItems);
        $rootScope.$on('destroy', {
            // Stop the listener
            listener();
        })
    }   
    // Getting all the items from the server on each controller creation
    GetAllItemsFromServer(){
        // Getting the items
    }
    // Handle the notification from the server
    public UpdateItems(event, result) : void 
        //..
    }
}

目前发生的事情，例如，当终端用户刷新浏览器(F5)，我不知道这个客户端在连接问题期间错过了什么SignalR通知，所以我从服务器重新加载所有数据(它很糟糕)。

为了防止它，我想实现这样的东西-

namespace MapUsersSample
{
    public class UserContext : DbContext
    {
        // All those are cleaned when server is powered up
        public DbSet<Connection> Connections { get; set; }
        public DbSet<Notification> Notifications {get; set;}
    }
    public class Connection
    {
        [Key]
        [DatabaseGenerationOptions.None]
        public string ConnectionID { get; set; }
        public bool Connected { get; set; }
        // I fill this when disconnected
        public List<Notification> MissedNotifications {get; set;}
        public Connection(string id)
        {
            this.ConnectionID = id;
            this.Connected = true;
            this.MissedNotifications = new List<Notification>();
        }
    }
    public abstract class Notification()
    {
        public int Id {get; set;}
        public DateTime CreationTime {get; set;}
    }
    .. // Many notifications implement this
}
public class MyHub : Hub
{
    private readonly DbContext _db;
    public class MyHub(DbContext db)
    {
        this._db = db;
    }
    // Adding a new connection or updating status to true
    public override Task OnConnected()
    {
        var connection = GetConnection(Context.ConnectionId);
        if (connection == null)
            _db.Connections.Add(new Connection(Context.ConnectionId));
        else 
            connection.Connected = true;
        return base.OnConnected()
    }
    // Changing connection status to false
    public override Task OnDisconnected()
    {
        var connection = GetConnection(Context.ConnectionId);
        if (connection == null)
        {
            Log("Disconnect error: failed to find a connection with id : " + Context.ConnectionId);
            return;
        }
        else {
            connection.Connected = false;
        }
        return base.OnDisconnected();
    }
    public override Task OnReconnected()
    {
       var connection = GetConnection(Context.ConnectionId);
        if (connection == null)
        {
            Log("Reconnect error - failed to find a connection with id : " + Context.ConnectionId);
            return;
        }
        else {
            connection.Connected = true;
        }
        // On reconnect, trying to send to the client all the notifications that he has missed
        foreach (var notification in connection.MissedNotifications){
            Clients.Client(connection.ConnectionID).handleNotification(notification);
        }
        return base.OnReconnected();
    }
    // This method is called from clients that receive a notification
    public clientNotified(int connectionId, int notificationId)
    {
        // Getting the connection
        var connection = GetConnection(connectionId);
        if (connection == null){
            Log("clientNotified error - failed to find a connection with id : " + Context.ConnectionId);
            return;
        }
        // Getting the notification that the client was notified about
        var notificationToRemove = _dbConnection.Notifications.FirstOrDefault(n => n.Id == notificationId);
        if (notificationToRemove == null)
        {
            Log("clientNotified error - failed to find notification with id : " + notificationId);
            return;
        }
        // Removing from the missed notifications
        connection.MissedNotifications.Remove(notificationToRemove);
    }
    private Connection GetConnection(int connectionId) 
    {
        return _db.Connections.find(connectionId);
    }

}
// Notifications outside of the hub
public class Broadcaster
{
    DbContext _db;
    public Broadcaster(DbContext db)
    {
        _hubContext = GlobalHost.ConnectionManager.GetHubContext<MoveShapeHub>();
        _dbConnection = db;
    }
    public void NotifyClients(Notification notification)
    {
        var openConnections = _db.Connections.Where(x => x.Connected);
        var closedConnections = _db.Connections.Where(x => !x.Connected);
        // Adding all notifications to be sent when those connections are back
        foreach (var connection in closedConnections){
            connection.MissedNotifications.add(notification);
        }
        // Notifying all open connections
        foreach (var connection in openConnections){
            _hubContext.Clients.Client(connection.ConnectionID).handleNotification(notification);
        }
    }
}

client side java script:
handleNotification(notification){
    hubProxy.Server.clientNotified(hub.connection.id, notification.Id)
    // Keep handling the notification here..
}

我还没有测试它，但是在我向我的团队提出这个想法之前，这个方法受欢迎吗?我没见过有人采用这种方法，我想知道为什么?这里有风险吗?

{
clients: '2016-05-05T09:05:05',
orders: '2016-09-20T10:11:11'
}