其實(shí)微軟在.NET Framework時代就有Redis和Signalr的解決方案了。只不過我沒有花心思去找源碼。.NET Core版本的源碼倒是很全。我們在用signalR的時候。是會先創(chuàng)建一個ChatHub繼承Hub

public class ChatHub:Hub{public async Task SendMessage(string user,string message){await Clients.All.SendAsync("ReceiveMessage", user, message);}}

可以看到這里是調(diào)用了Clients.All.SendAsync方法。我們查看源碼，可以看到Hub是一個抽象類

public abstract class Hub : IDisposable{private bool _disposed;private IHubCallerClients _clients;private HubCallerContext _context;private IGroupManager _groups;/// <summary>/// Gets or sets an object that can be used to invoke methods on the clients connected to this hub./// </summary>public IHubCallerClients Clients{get{CheckDisposed();return _clients;}set{CheckDisposed();_clients = value;}} }

在Hub中的Clients繼承IHubCallerClients的。我們通過Crtl+F12查看實(shí)現(xiàn)找到HubCallerClients。所以不難看出上文中的Clients其實(shí)是HubCallerClients對象。在HubCallerClients中可以找到這段代碼

public IClientProxy All => _hubClients.All; 而這個_hubClients其實(shí)是HubClients。在HubClients的構(gòu)造函數(shù)中我們可以看到 public HubClients(HubLifetimeManager<THub> lifetimeManager){_lifetimeManager = lifetimeManager;All = new AllClientProxy<THub>(_lifetimeManager);} HubLifetimeManager是一個抽象類。在這里我們用Redis做底板的時候。在這段代碼里就完成了 HubLifetimeManager的注冊 public static ISignalRServerBuilder AddStackExchangeRedis(this ISignalRServerBuilder signalrBuilder, Action<RedisOptions> configure){signalrBuilder.Services.Configure(configure);signalrBuilder.Services.AddSingleton(typeof(HubLifetimeManager<>), typeof(RedisHubLifetimeManager<>));return signalrBuilder;}

而這個AllClientProxy對象其實(shí)很干凈。只有一個方法

internal class AllClientProxy<THub> : IClientProxy where THub : Hub{private readonly HubLifetimeManager<THub> _lifetimeManager;public AllClientProxy(HubLifetimeManager<THub> lifetimeManager){_lifetimeManager = lifetimeManager;}public Task SendCoreAsync(string method, object[] args, CancellationToken cancellationToken = default){return _lifetimeManager.SendAllAsync(method, args);}}

所以上面的Clients.All其實(shí)是AllClientProxy對象。至于SendAsync其實(shí)是一個擴(kuò)展方法

public static Task SendAsync(this IClientProxy clientProxy, string method, object arg1, object arg2, CancellationToken cancellationToken = default){return clientProxy.SendCoreAsync(method, new[] { arg1, arg2 }, cancellationToken);}

可以看到，此時Clients.All.SendAsync實(shí)際上是調(diào)用AllClientProxy的SendCoreAsync方法

轉(zhuǎn)載于:https://www.cnblogs.com/dbdn/p/11389737.html

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