Question

我正在尝试使用其NettyServer实现来实现异步Avro调用。在挖掘源代码之后，我找到了一个关于如何使用TestNettyServerWithCallbacks.java中的NettyServer的示例

当运行一些测试时，我意识到NettyServer从不调用hello（Callback）方法，而是继续调用同步hello（）方法。客户端程序打印出“Hello”，但我期待“Hello-ASYNC”。我真的不知道发生了什么。

我希望有人可以对我发光并指出错误。下面是我用来执行简单的异步avro测试的代码。

AvroClient.java - 客户端代码。

public class AvroClient {
    public static void main(String[] args) throws InterruptedException, ExecutionException, TimeoutException {
        try {
            NettyTransceiver transceiver = new NettyTransceiver(new InetSocketAddress(6666));
            Chat.Callback client = SpecificRequestor.getClient(Chat.Callback.class, transceiver);

            final CallFuture<CharSequence> future1 = new CallFuture<CharSequence>();
            client.hello(future1);

            System.out.println(future1.get());

            transceiver.close();

        } catch (IOException ex) {
            System.err.println(ex);
        }
    }
}

AvroNetty.java - 服务器代码

public class AvroNetty {
    public static void main(String[] args) {
        Index indexImpl = new AsyncIndexImpl();
        Chat chatImpl = new ChatImpl();

        Server server = new NettyServer(new SpecificResponder(Chat.class, chatImpl), new InetSocketAddress(6666));
        server.start();
        System.out.println("Server is listening at port " + server.getPort());
    }
}

ChatImpl.java

public class ChatImpl implements Chat.Callback {
    @Override
    public void hello(org.apache.avro.ipc.Callback<CharSequence> callback) throws IOException {
        callback.handleResult("Hello-ASYNC");    
    }

    @Override
    public CharSequence hello() throws AvroRemoteException {
        return new Utf8("Hello");    
    }
}

此界面由avro-tool自动生成 Chat.java

@SuppressWarnings("all")
public interface Chat {
    public static final org.apache.avro.Protocol PROTOCOL = org.apache.avro.Protocol.parse("{\"protocol\":\"Chat\",\"namespace\":\"avro.test\",\"types\":[],\"messages\":{\"hello\":{\"request\":[],\"response\":\"string\"}}}");
    java.lang.CharSequence hello() throws org.apache.avro.AvroRemoteException;

    @SuppressWarnings("all")
    public interface Callback extends Chat {
        public static final org.apache.avro.Protocol PROTOCOL = avro.test.Chat.PROTOCOL;
        void hello(org.apache.avro.ipc.Callback<java.lang.CharSequence> callback) throws java.io.IOException;
    }
}

这是Avro Schema

{
  "namespace": "avro.test",
  "protocol": "Chat",

  "types" : [],

  "messages": {
      "hello": { 
                    "request": [],
                    "response": "string"
      }
  }
}

Answer 1

NettyServer实现实际上根本没有实现Async样式。这是图书馆的一个缺陷。相反，您需要指定一个异步执行处理程序，而不是通过回调尝试和链接服务。以下是我用来设置我的NettyServer以实现此目的：

ExecutorService es = Executors.newCachedThreadPool();
OrderedMemoryAwareThreadPoolExecutor executor = new OrderedMemoryAwareThreadPoolExecutor(Runtime.getRuntime().availableProcessors(), 0, 0);
ExecutionHandler executionHandler = new ExecutionHandler(executor);
final NettyServer server = new NettyServer(responder, addr, new NioServerSocketChannelFactory(es, es), executionHandler);

如何：使用Netty与Avro进行异步回调

1 个答案: