Vertx基于EventBus发送接受自定义对象

/
  自定义对象编解码器,两个类型可用于消息转换,即发送对象转换为接受需要的对象
 /
public class CustomizeMessageCodec implements MessageCodec<OrderMessage, OrderMessage> {
  /
    将消息实体封装到Buffer用于传输
    实现方式使用对象流从对象中获取Byte数组然后追加到Buffer
   /
  @Override
  public void encodeToWire(Buffer buffer, OrderMessage orderMessage) {
    final ByteArrayOutputStream b = new ByteArrayOutputStream();
    try (ObjectOutputStream o = new ObjectOutputStream(b)){
      o.writeObject(orderMessage);
      o.close();
      buffer.appendBytes(b.toByteArray());
    } catch (IOException e) { e.printStackTrace(); }
  }
  //从Buffer中获取消息对象
  @Override
  public OrderMessage decodeFromWire(int pos, Buffer buffer) {
    final ByteArrayInputStream b = new ByteArrayInputStream(buffer.getBytes());
    OrderMessage msg = null;
    try (ObjectInputStream o = new ObjectInputStream(b)){ msg = (OrderMessage) o.readObject();
    } catch (IOException | ClassNotFoundException e) { e.printStackTrace(); }
    return msg;
  }
  //消息转换
  @Override
  public OrderMessage transform(OrderMessage orderMessage) {
    System.out.println("消息转换---");//可对接受消息进行转换,比如转换成另一个对象等
    orderMessage.setName("姚振");
    return orderMessage;
  }
  @Override
  public String name() { return "myCodec"; }
  //识别是否是用户自定义编解码器,通常为-1
  @Override
  public byte systemCodecID() { return -1; }
  public static MessageCodec create() {
    return new CustomizeMessageCodec();
  }
}

public class ProducerVerticle extends AbstractVerticle {
  @Override
  public void start() throws Exception {
    EventBus eventBus = vertx.eventBus();
    //发布消息(群发)
    eventBus.publish(".hou", "群发祝福!");
    //发送消息(单发),只会发送注册此地址的一个,采用不严格的轮询算法选择
    DeliveryOptions options = new DeliveryOptions();//设置消息头等
    options.addHeader("some-header", "some-value");
    eventBus.send(".hou", "单发消息",options,ar->{
      if(ar.sueeded()) System.out.println("收到消费者确认信息:"+ar.result().body());
    });
    //发送自定义对象,需要编解码器
    eventBus.registerCodec(CustomizeMessageCodec.create());//注册编码器
    DeliveryOptions options1 = new DeliveryOptions().setCodecName("myCodec");//必须指定名字
    OrderMessage orderMessage = new OrderMessage();
    orderMessage.setName("侯征");
    eventBus.send(".hou", orderMessage, options1);
  }
}

public class ConsumerVerticle extends AbstractVerticle {
  @Override
  public void start() throws Exception {
    //每个Vertx实例默认是单例
    EventBus eb = vertx.eventBus();
    //注册处理器,消费.hou发送的消息
    MessageConsumer<Object> consumer = eb.consumer(".hou");//订阅地址
    consumer.handler(message -> {//消息处理器
      if(message.body() instanceof OrderMessage){
        System.out.println("接受到对象: " + ((OrderMessage) message.body()).getName());
      }
      System.out.println("我是普通消费者: " + message.body());
      message.reply("收到了!"); // 回复生产者,send才能接受
    }).pletionHandler(res -> {//注册完成后通知事件,适用于集群中比较慢的情况下
        System.out.println("注册处理器结果"+res.sueeded());
    });
    //撤销处理器
    //consumer.unregister();
  }
}

vertx.deployVerticle(ConsumerVerticle.class.getName());
    TimeUnit.SECONDS.sleep(1);
    vertx.deployVerticle(ProducerVerticle.class.getName());