spring-integration-mqtt与多个Mqtt服务器进行订阅

Question

我使用spring的spring集成- Mqtt和我可以连接到单个Mqtt服务器，并且可以接收订阅主题上的消息，现在我想要创建一个应用程序，它可以连接到多个Mqtt服务器，并且可以从每个连接接收数据，我想将它作为动态管理，在这里我可以从数据库或文本文件中添加更多的Mqtt服务器。

用于订阅的单个Mqtt连接的简单bean如下所示

@Bean
public MessageProducer inbound() {

    MqttPahoMessageDrivenChannelAdapter adapter2 =
            new MqttPahoMessageDrivenChannelAdapter("tcp://192.168.100.1:1883","mqtt_virtual_received_sus_2",
                                             "DATA/#", "LD/#","CONF/#","CONFIG/#");
    adapter2.setCompletionTimeout(0);
    adapter2.setConverter(new DefaultPahoMessageConverter());
    adapter2.setQos(2);

    adapter2.setOutputChannel(mqttInputChannel());
    return adapter2;

}

上面的代码为mqtt服务器创建了一个连接，可以接收消息，如果我为第二个服务器复制两次相同的代码，具有不同的Mqtt ip地址，我可以连接到两个Mqtt服务器，如下所示

@Bean
public MessageProducer inbound() {

    MqttPahoMessageDrivenChannelAdapter adapter2 =
            new MqttPahoMessageDrivenChannelAdapter("tcp://192.168.100.1:1883","mqtt_virtual_received_sus_2",
                                             "DATA/#", "LD/#","CONF/#","CONFIG/#");
    adapter2.setCompletionTimeout(0);
    adapter2.setConverter(new DefaultPahoMessageConverter());
    adapter2.setQos(2);

    adapter2.setOutputChannel(mqttInputChannel());
    return adapter2;

}

@Bean
public MessageProducer inbound2() {

    MqttPahoMessageDrivenChannelAdapter adapter2 =
            new MqttPahoMessageDrivenChannelAdapter("tcp://192.168.100.14:1883","mqtt_virtual_received_sus_1",
                                             "DATA/#", "LD/#","CONF/#","CONFIG/#");
    adapter2.setCompletionTimeout(0);
    adapter2.setConverter(new DefaultPahoMessageConverter());
    adapter2.setQos(2);

    adapter2.setOutputChannel(mqttInputChannel());
    return adapter2;

}

上面的代码也很好，我可以从两个Mqtt服务器接收消息，但是有什么方法可以像下面这样动态地管理它吗?我将bean的返回类型更改为list，但没有工作：

  @Bean
  public List<MqttPahoMessageDrivenChannelAdapter> getAdapter () {
      List<MqttPahoMessageDrivenChannelAdapter > logConfList=new ArrayList<MqttPahoMessageDrivenChannelAdapter>();
      MqttPahoMessageDrivenChannelAdapter adapter2 =
              new MqttPahoMessageDrivenChannelAdapter("tcp://192.168.100.1:1883","mqtt_virtual_received_sus_2",
                                               "DATA/#", "LD/#","CONF/#","CONFIG/#");
      adapter2.setCompletionTimeout(0);
      adapter2.setConverter(new DefaultPahoMessageConverter());
      adapter2.setQos(2);

      adapter2.setOutputChannel(mqttInputChannel() );

      MqttPahoMessageDrivenChannelAdapter adapter =
              new MqttPahoMessageDrivenChannelAdapter("tcp://192.168.100.14:1883","mqtt_virtual_received_sus_1",
                                               "DATA/#", "LD/#","CONF/#","CONFIG/#");
      adapter.setCompletionTimeout(0);
      adapter.setConverter(new DefaultPahoMessageConverter());
      adapter.setQos(2);

      adapter.setOutputChannel(mqttInputChannel() );
      logConfList.add(adapter);
      logConfList.add(adapter2);

      return logConfList;

  }

有什么方法可以动态地管理这些bean吗?在这里，我可以从文本文件和for循环中获取mqtt服务器的详细信息，或者我可以管理多个连接。

Answer 1

见动态和运行时集成流。

@Autowired
private IntegrationFlowContext flowContext;

private IntegrationFlowRegistration addAnAdapter(String uri, String clientId, MessageChannel channel,
        String... topics) {
    MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter(uri, clientId, topics);
    // more adapter configuration
    IntegrationFlow flow = IntegrationFlows.from(adapter)
        .channel(channel)
        .get();
    return this.flowContext.registration(flow).register();
}

private void removeAdapter(IntegrationFlowRegistration flowReg) {
    this.flowContext.remove(flowReg.getId());
}