public static <T> CompositeStreamObserver<T> of(final StreamObserver<T> observers,
                                                    final CompleteObserver<T> completeObserver) {
        return new CompositeStreamObserver<>(ImmutableList.of(observers, completeObserver));
    }
CompositeStreamObserver of.

@param observers        observers
@param completeObserver completeObserver
@param <T>              t
@return CompositeStreamObserver compositeStreamObserver
shenyu-plugin/shenyu-plugin-proxy/shenyu-plugin-rpc/shenyu-plugin-grpc/src/main/java/org/apache/shenyu/plugin/grpc/proto/CompositeStreamObserver.java