Orleans 谷物客户端和谷物之间的双向通信

Question

我想在 grain 方法中实现对 grain 客户端的回调，例如。在评估 Grain.Method1 期间，需要调用客户端方法来获取一些数据。

我已经尝试使用流来执行此操作，但是当我在客户端上订阅流时，该方法不会触发。

粮食：

var config = ClusterConfiguration.LocalhostPrimarySilo();
config.AddMemoryStorageProvider();
config.Globals.RegisterStorageProvider<MemoryStorage>("PubSubStore");
config.Globals.RegisterStreamProvider<SimpleMessageStreamProvider>("MySMSProvider");
...
public override async Task OnActivateAsync() {
var streamProvider  = GetStreamProvider("MySMSProvider");
var stream = streamProvider.GetStream<MyTypeMessage>(myGuid, "MyStream");

RegisterTimer(s => {
   return stream.OnNextAsync(new MyTypeMessage());
}, null, TimeSpan.FromMilliseconds(1000), TimeSpan.FromMilliseconds(1000));
...

客户：

var clientConfiguration = ClientConfiguration.LocalhostSilo();
clientConfiguration.RegisterStreamProvider<SimpleMessageStreamProvider>("MySMSProvider");
GrainClient.Initialize(clientConfiguration);
...
var streamProvider = GrainClient.GetStreamProvider("MySMSProvider");
var stream = requestStreamProvider.GetStream<MyTypeMessage>(myGuid, "MyStream");
await stream.SubscribeAsync(
            async (message, token) => { process message that does not fire });

Answer 1

您似乎没有保留对 StreamSubscriptionHandle<MyTypeMessage> 的引用，该引用由订阅

返回

尝试这样的事情： var subscriptionHandle = await _factCalculationRequestStream .SubscribeAsync(async (message, token) => { process message that does not fire }); 并防止 subscriptionHandle 被垃圾收集

在我的例子中，我最终在我的 class 上实现了 IGrainObserver（这是 WebAPI 项目中的一个 websocketBehaviour，这个订阅运行良好：

public class MySocketService: WebSocketBehavior, IGrainObserver, IDisposable
{
  private StreamSubscriptionHandle<MyStreamEvent>
  ...

  //inside some method invoked externally
  _streamSubscriberHandle = await requestedStream
     .SubscribeAsync(onStreamMessage, onStreamError, onStreamComplete);
}

Orleans 谷物客户端和谷物之间的双向通信

Orleans two way communication between grain client and grain

orleans