我如何知道 GRPC 连接是否已丢失？

Question

I have implemented GRPC Client with Java.

String host:"192.893.12.11";
int port:9090; 

ManagedChannel managedChannel = ManagedChannelBuilder.forAddress(host, port).usePlaintext().build();

I wanna be informed when grpc connection lost. How to notify the client if the GRPC connection has been lost?

Answer 1

You can use ManagedChannel's notifyWhenStateChanged method to get notify when channel state changed,like want get notify when server shutdown,you can try the below code:

// create a ManagedChannel 
ManagedChannel channel = ManagedChannelBuilder.forTarget(target)
        .usePlaintext()
        .build();

// add callback method
channel.notifyWhenStateChanged(ConnectivityState.SHUTDOWN, () -> System.out.println("server shutdown"));