@Override
            public void onCompleted() {
                observer.onCompleted();
            }
Method call type (Full method name - Streaming call type)
Since gRPC does not support method overload, each method here will only represent a single call type.
remoting/remoting-triple/src/main/java/com/alipay/sofa/rpc/transport/triple/TripleClientInvoker.java