grpc java中ListenableFuture样式存根与异步存根的区别

Question

在gRPC java实现中ListenableFuture样式存根和异步存根有什么不同？

异步通信使用哪一个？

public static MyServiceStub newStub(io.grpc.Channel channel) {
    io.grpc.stub.AbstractStub.StubFactory<MyServiceStub> factory =
      new io.grpc.stub.AbstractStub.StubFactory<MyServiceStub>() {
        @java.lang.Override
        public MyServiceStub newStub(io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
          return new MyServiceStub(channel, callOptions);
        }
      };
    return MyServiceStub.newStub(factory, channel);
  }


public static MyServiceBlockingStub newBlockingStub(
      io.grpc.Channel channel) {
    io.grpc.stub.AbstractStub.StubFactory<MyServiceBlockingStub> factory =
      new io.grpc.stub.AbstractStub.StubFactory<MyServiceBlockingStub>() {
        @java.lang.Override
        public MyServiceBlockingStub newStub(io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
          return new MyServiceBlockingStub(channel, callOptions);
        }
      };
    return MyServiceBlockingStub.newStub(factory, channel);
  }




public static MyServiceFutureStub newFutureStub(
      io.grpc.Channel channel) {
    io.grpc.stub.AbstractStub.StubFactory<MyServiceFutureStub> factory =
      new io.grpc.stub.AbstractStub.StubFactory<MyServiceFutureStub>() {
        @java.lang.Override
        public MyServiceFutureStub newStub(io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
          return new MyServiceFutureStub(channel, callOptions);
        }
      };
    return MyServiceFutureStub.newStub(factory, channel);
  }

Answer 1

同步与异步存根对通信没有影响。grpc中的存根是通道API之上的一个小空间，存根的不同在于它们是不同的API。只需选择与您希望如何接收响应最接近的存根类型。如果您喜欢异步API，请使用异步API；如果您喜欢未来API，请使用未来API；如果您喜欢同步，则使用同步。