java EmbeddedKafka在后续测试中延迟后向消费者发送消息

8 月，3 周 Questions & Answers 2972

我使用的是卡夫卡弹簧测试2.0.1版中的EmbeddedKafka。发布（最新版本）。我有一些非常简单的测试，当只运行一个测试时，它们可以正常工作但每当我一个接一个地运行它们（所以只运行整个测试类），第二个测试就会失败——消费者不会收到任何消息

public class KafkaControllerTest {

    private static final String FOO_TOPIC = "fooTopic";

    @Rule
    public KafkaEmbedded embeddedKafka = new KafkaEmbedded(1, true, FOO_TOPIC);

    MessageConsumer msgConsumerFoo = mock(MessageConsumer.class);

    @Before
    public void before() {
        assertTrue(embeddedKafka.getBrokerAddresses().length == 1);
        KafkaController controller = new KafkaController(
                embeddedKafka.getBrokerAddress(0).toString(),
                new Consumer(FOO_TOPIC, msgConsumerFoo));
        MockMvcBuilders.standaloneSetup(controller).build();
    }

    @Test
    public void kafkaFirstTest() throws Exception {
        sendMessage(FOO_TOPIC, "foo message");

        verify(msgConsumerFoo).consume(any());
    }

    @Test
    public void kafkaSecondTest() throws Exception {
        sendMessage(FOO_TOPIC, "foo2 message");

        verify(msgConsumerFoo).consume(any());
    }

    void sendMessage(String topic, String notification) throws ExecutionException, InterruptedException {
        Map<String, Object> props = KafkaTestUtils.producerProps(embeddedKafka);
        Producer<Integer, String> producer = new DefaultKafkaProducerFactory<Integer, String>(props).createProducer();
        producer.send(new ProducerRecord<>(topic, notification)).get();
    }
}

以及测试等级的代码：

public class KafkaController {

    public KafkaController(String brokerAddress, Consumer... consumers) {
        for (Consumer consumer : consumers) {
            addTopicListener(brokerAddress, consumer.topic, consumer.messageConsumer);
        }
    }

    private void addTopicListener(String brokerAddress, String topic, MessageConsumer consumer) {
        HashMap<String, Object> consumerConfig = new HashMap<>();
        consumerConfig.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, brokerAddress);
        consumerConfig.put(ConsumerConfig.GROUP_ID_CONFIG, UUID.randomUUID().toString());
        DefaultKafkaConsumerFactory<String, String> cf = new DefaultKafkaConsumerFactory<>(
                consumerConfig,
                new StringDeserializer(),
                new StringDeserializer());

        ContainerProperties containerProperties = new ContainerProperties(topic);
        containerProperties.setMessageListener((MessageListener<String, String>) data -> {
            consumer.consume(data.value());
        });
        ConcurrentMessageListenerContainer container = new ConcurrentMessageListenerContainer<>(cf, containerProperties);
        container.start();
    }

    public interface MessageConsumer {
        void consume(String message);
    }

    public static class Consumer {
        private final String topic;
        private final MessageConsumer messageConsumer;

        public Consumer(String topic, MessageConsumer messageConsumer) {
            this.topic = topic;
            this.messageConsumer = messageConsumer;
        }
    }
}

我认为问题是由{}引起的，因为使用本地Kafka实例测试的消费者工作正常

我有什么遗漏吗？我没有找到任何有帮助的消费品

Kafka-spring-test doc说：

It is generally recommended to use the rule as a @ClassRule to avoid starting/stopping the broker between tests (and use a different topic for each test).

然而，我试着把KafkaEmbedded变成@ClassRule并在测试中使用不同的主题，但仍然一无所获

这个问题与异步性有关，因为在第二次测试中添加延迟有助于：

@Test
public void kafkaSecondTest() throws Exception {
    Thread.sleep(1000);
    sendMessage(FOO_TOPIC, "foo2 message");
    Thread.sleep(1000);

    verify(msgConsumerFoo).consume(any());
}

是的，只有在发送消息之前和之后添加Thread.sleep(1000)时，它才会起作用

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java EmbeddedKafka在后续测试中延迟后向消费者发送消息

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