Spring集成: MQTT集成测试基础

Question

我试着测试使用Spring和创建的一个简单的MQTT侦听器，但是不能让它工作。我尝试过很多方法。最有希望的是：

@RunWith(SpringRunner.class)
@SpringBootTest
public class BasicMqttTest {

@Value("${mqtt.client.id}")
private String mqttClientId;

@Value("${mqtt.state.topic}")
private String mqttTopic;

@Autowired
MqttPahoClientFactory mqttPahoClientFactory;

protected IMqttClient client;

@Before
public void setUp() throws Exception {
    client = mqttPahoClientFactory.getClientInstance(mqttPahoClientFactory.getConnectionOptions().getServerURIs()[0], mqttClientId);
    client.connect();
}

@After
public void tearDown() throws Exception {
    client.disconnect();
    client.close();
}

@Test
public void contextLoads() throws Exception {
    MqttMessage mqttMessage = new MqttMessage();
    mqttMessage.setPayload("MQTT!".getBytes());
    client.publish(mqttTopic, mqttMessage);
}
}

但是，这个测试是在2018-07-12 16:53:50.937 ERROR 21160 --- [T Rec: consumer] .m.i.MqttPahoMessageDrivenChannelAdapter : Lost connection: Verbindung wurde getrennt; retrying...上运行的，我没有看到任何打印出来的东西。代码主要来自：https://github.com/spring-projects/spring-integration-samples/tree/master/basic/mqtt。该示例运行良好，但我需要能够编写适当的集成测试。

配置如下：

@Value("${mqtt.server.uri}")
private String mqttServerUri;

@Value("${mqtt.username}")
private String mqttUsername;

@Value("${mqtt.password}")
private String mqttPassword;

@Value("${mqtt.client.id}")
private String mqttClientId;

@Value("${mqtt.state.topic}")
private String mqttTopic;

@Value("${mqtt.completion.timeout}")
private Integer mqttCompletionTimeout;

@Value("${mqtt.quality.of.service}")
private Integer mqttQualityOfService;

@Bean
public MqttPahoClientFactory mqttClientFactory() {
    DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
    MqttConnectOptions options = new MqttConnectOptions();
    options.setServerURIs(new String[]{mqttServerUri});
    options.setUserName(mqttUsername);
    options.setPassword(mqttPassword.toCharArray());
    factory.setConnectionOptions(options);
    return factory;
}

@Bean
@Qualifier("MqttInboundChannel")
public MessageProducerSupport mqttInbound() {
    MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter(
            mqttClientId,
            mqttClientFactory(),
            mqttTopic
    );
    adapter.setCompletionTimeout(mqttCompletionTimeout);
    adapter.setConverter(new DefaultPahoMessageConverter());
    adapter.setQos(mqttQualityOfService);
    return adapter;
}

@Bean
public IntegrationFlow myMqttInFlow() {
    return IntegrationFlows.from(mqttInbound)
            .handle(message -> {
                System.out.println(message);
            }).get();
}

更新：

也没有起作用：

@Autowired
protected MessageHandler mqttOutbound;

@Test
public void test0() throws Exception {
    mqttOutbound.handleMessage(MessageBuilder.withPayload("test").build());
}


@SpringBootApplication
static class MqttSourceApplication {

    @Autowired
    private MqttPahoClientFactory mqttClientFactory;

    @Bean
    public MessageHandler mqttOutbound() {
        MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler("test", mqttClientFactory);
        messageHandler.setAsync(true);
        messageHandler.setDefaultTopic("test");
        messageHandler.setConverter(pahoMessageConverter());
        return messageHandler;
    }

    @Bean
    public DefaultPahoMessageConverter pahoMessageConverter() {
        DefaultPahoMessageConverter converter = new DefaultPahoMessageConverter(1, false, "UTF-8");
        return converter;
    }

}

更新

更简单..。同样的错误：

@Autowired
MqttPahoClientFactory mqttPahoClientFactory;

private MessageHandler mqttOutbound;

@Before
public void setUp() throws Exception {
    MqttPahoMessageHandler messageHandler  = new MqttPahoMessageHandler(mqttClientId, mqttPahoClientFactory);
    messageHandler.setAsync(false);
    messageHandler.setDefaultTopic(mqttTopic);
    messageHandler.setConverter(new DefaultPahoMessageConverter());
    mqttOutbound = messageHandler;

}

@Test
public void test0() throws Exception {
    mqttOutbound.handleMessage(MessageBuilder.withPayload("test").build());
    Thread.sleep(10000L);
}

Answer 1

好的，解决了: Paho显然关闭了我的连接，因为测试和main都使用相同的客户端id。解决方案是将clientId替换为MqttAsyncClient.generateClientId()，如下所示：https://stackoverflow.com/a/48232793/2739681