grpc java中ListenableFuture风格的存根和异步存根之间的区别

Question

gRPC java 实现中 ListenableFuture 风格的存根和异步存根有什么区别？

哪一个用于异步通信？

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-java 中的存根是 Channel API 之上的一个小垫片，存根的不同之处在于它们是不同的 API。只需选择与您希望接收响应的方式最匹配的存根类型。如果您喜欢异步 API，请使用异步 API；如果您喜欢 Future API，请使用 Future API；如果您喜欢同步，请使用同步。