Asynchronous 如何：使用Netty和Avro进行异步回调

我试图通过使用NettyServer实现来实现异步Avro调用。在挖掘源代码之后，我从TestNettyServerWithCallbacks.java中找到了一个关于如何使用NettyServer的示例

在运行一些测试时，我意识到NettyServer从不调用hello（回调）方法，而是一直调用同步hello（）方法。客户端程序打印出“Hello”，但我希望结果是“Hello ASYNC”。我真的不知道发生了什么事

我希望有人能给我一些启示，也许能指出错误。下面是我用来执行简单异步avro测试的代码

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);
        }
    }
}

chaimpl.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");    
    }
}

---

NettyServer实现实际上根本没有实现异步样式。这是图书馆的不足之处。相反，您需要指定一个异步执行处理程序，而不是尝试通过回调将服务链接在一起。以下是我用来设置NetyServer的方法，以实现这一点：

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);

---

嘿Carbotex，我也有同样的问题。你有没有想过为什么会发生这种情况？？

@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;
    }
}

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

  "types" : [],

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

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);