Question

所以我在测试我的网络时遇到了问题，下面有很多代码，但这个问题就像我可以做的那么小。我遇到的问题是，当我发送消息时，我正在向服务器注册并且客户端永远不会被调用。

lock.await(5000, TimeUnit.MILLISECONDS)应该等到收到消息或者在5秒后超时。但是，在设置阻止测试失败的lock.countDown()变量后，侦听器应该告诉锁定继续response。

正如您所猜测的那样，这不会发生，消息会被发送，锁定会因超时而继续，并且测试失败，因为response为空。

import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryonet.Client;
import com.esotericsoftware.kryonet.Connection;
import com.esotericsoftware.kryonet.Listener;
import com.esotericsoftware.kryonet.Server;
import com.esotericsoftware.minlog.Log;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import java.io.IOException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import static junit.framework.TestCase.fail;

public class TestMessage {
    private Server server;
    private Client client;
    private String response;
    private CountDownLatch lock = new CountDownLatch(1);

    @Before
    public void setUp() {
        Log.set(Log.LEVEL_DEBUG);

        server = new Server();
        try {
            Log.debug("Binding to port: " + 30454 + "... ");
            server.bind(30454);
            Log.debug("Bound to port" + 30454);
        } catch (IOException e) {
            Log.debug("failed");
            Log.error("Unable to bind to port: " + e.getMessage());
            server.stop();
            fail("Unable to start server");
        }
        Kryo kryo = server.getKryo();
        kryo.register(Message.class);
        Log.debug("Adding server listener");
        server.addListener(new TestListener());
        Log.debug("Starting server... ");
        server.start();
        Log.debug("Server started successfully");
    }

    @Test
    public void testPacketSending() throws IOException, InterruptedException {
        client = new Client();
        client.addListener(new TestListener());
        Kryo kryo = client.getKryo();
        kryo.register(Message.class);
        client.start();
        client.connect(5000, "127.0.0.1", 30454);

        client.sendTCP(new Message("RECEIVED"));

        lock.await(5000, TimeUnit.MILLISECONDS);

        Assert.assertNotNull(response);
    }

    private class TestListener extends Listener {
        @Override
        public void received(Connection connection, Object o) {
            Message m = (Message) o;
            response = m.message;
            Log.debug(m.message);
            lock.countDown();
        }
    }

    private class Message {
        String message;

        Message(String message) {
            this.message = message;
        }
    }
}

Answer 1

这里的问题是：

00:00 ERROR: [kryonet] Error reading TCP from connection: Connection 1
com.esotericsoftware.kryonet.KryoNetException: Error during deserialization.
    at com.esotericsoftware.kryonet.TcpConnection.readObject(TcpConnection.java:141)
    at com.esotericsoftware.kryonet.Server.update(Server.java:205)
    at com.esotericsoftware.kryonet.Server.run(Server.java:372)
    at java.lang.Thread.run(Thread.java:745)
Caused by: com.esotericsoftware.kryo.KryoException: Class cannot be created (non-static member class): org.glytching.sandbox.kryo.TestMessage$MessageA
    at com.esotericsoftware.kryo.Kryo$DefaultInstantiatorStrategy.newInstantiatorOf(Kryo.java:1308)
    at com.esotericsoftware.kryo.Kryo.newInstantiator(Kryo.java:1127)
    at com.esotericsoftware.kryo.Kryo.newInstance(Kryo.java:1136)
    at com.esotericsoftware.kryo.serializers.FieldSerializer.create(FieldSerializer.java:562)
    at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:538)
    at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:816)
    at com.esotericsoftware.kryonet.KryoSerialization.read(KryoSerialization.java:55)
    at com.esotericsoftware.kryonet.TcpConnection.readObject(TcpConnection.java:139)
    ... 3 more

Kryonet不能反序列化为Message，因为（a）它是一个非静态内部类，（b）它没有公共零参数构造函数。 FWIW，有一些background here解释为什么Kryonet不支持非静态内部类的序列化。

如果你（a）将Message重构为自己的类或使其静态，（b）给它一个零参数构造函数，那么你的测试将通过。

进行测试通过所需的最小更改是替换此...

private class Message {
    String message;

    Message(String message) {
        this.message = message;
    }
}

......用这个：

private static class Message {
    String message;

    Message() {

    }

    Message(String message) {
        this.message = message;
    }
}

重新：

下面有很多代码，但这是我可以做的一个小例子

你问题中的复制案例绰绰有余，谢谢。

kryonet听众没有收到消息？

1 个答案: