序列化、反序列化和訊息轉換

props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, IntegerDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
...
props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, IntegerSerializer.class);
props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);

ToStringSerializer<Thing> thingSerializer = new ToStringSerializer<>();
//...
ParseStringDeserializer<Thing> deserializer = new ParseStringDeserializer<>(Thing::parse);

ParseStringDeserializer<Object> deserializer = new ParseStringDeserializer<>((str, headers) -> {
    byte[] header = headers.lastHeader(ToStringSerializer.VALUE_TYPE).value();
    String entityType = new String(header);

    if (entityType.contains("Thing")) {
        return Thing.parse(str);
    }
    else {
        // ...parsing logic
    }
});

JsonDeserializer<Thing> thingDeserializer = new JsonDeserializer<>(Thing.class);

ConsumerFactory cf = new DefaultKafkaConsumerFactory(myConsumerConfigs,
    new RetryingDeserializer(myUnreliableKeyDeserializer, retryTemplate),
    new RetryingDeserializer(myUnreliableValueDeserializer, retryTemplate));

@Bean
public KafkaListenerContainerFactory<?> kafkaJsonListenerContainerFactory() {
    ConcurrentKafkaListenerContainerFactory<Integer, String> factory =
        new ConcurrentKafkaListenerContainerFactory<>();
    factory.setConsumerFactory(consumerFactory());
    factory.setRecordMessageConverter(new JsonMessageConverter());
    return factory;
}
...
@KafkaListener(topics = "jsonData",
                containerFactory = "kafkaJsonListenerContainerFactory")
public void jsonListener(Cat cat) {
...
}

template.setMessagingConverter(mySmartConverter);

@KafkaListener(id = "withSmartConverter", topics = "someTopic",
    contentTypeConverter = "mySmartConverter")
public void smart(Thing thing) {
    ...
}

... // other props
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, ErrorHandlingDeserializer.class);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, ErrorHandlingDeserializer.class);
props.put(ErrorHandlingDeserializer.KEY_DESERIALIZER_CLASS, JsonDeserializer.class);
props.put(JsonDeserializer.KEY_DEFAULT_TYPE, "com.example.MyKey")
props.put(ErrorHandlingDeserializer.VALUE_DESERIALIZER_CLASS, JsonDeserializer.class.getName());
props.put(JsonDeserializer.VALUE_DEFAULT_TYPE, "com.example.MyValue")
props.put(JsonDeserializer.TRUSTED_PACKAGES, "com.example")
return new DefaultKafkaConsumerFactory<>(props);

public class BadThing extends Thing {

  private final FailedDeserializationInfo failedDeserializationInfo;

  public BadThing(FailedDeserializationInfo failedDeserializationInfo) {
    this.failedDeserializationInfo = failedDeserializationInfo;
  }

  public FailedDeserializationInfo getFailedDeserializationInfo() {
    return this.failedDeserializationInfo;
  }

}

public class FailedThingProvider implements Function<FailedDeserializationInfo, Thing> {

  @Override
  public Thing apply(FailedDeserializationInfo info) {
    return new BadThing(info);
  }

}

...
consumerProps.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, ErrorHandlingDeserializer.class);
consumerProps.put(ErrorHandlingDeserializer.VALUE_DESERIALIZER_CLASS, JsonDeserializer.class);
consumerProps.put(ErrorHandlingDeserializer.VALUE_FUNCTION, FailedThingProvider.class);
...

@Bean
public ProducerFactory<String, Object> producerFactory() {
  return new DefaultKafkaProducerFactory<>(producerConfiguration(), new StringSerializer(),
    new DelegatingByTypeSerializer(Map.of(byte[].class, new ByteArraySerializer(),
          MyNormalObject.class, new JsonSerializer<Object>())));
}

@Bean
public KafkaTemplate<String, Object> kafkaTemplate() {
  return new KafkaTemplate<>(producerFactory());
}

@KafkaListener(id = "test", topics = "test")
void listen(List<Thing> in, @Header(KafkaHeaders.BATCH_CONVERTED_HEADERS) List<Map<String, Object>> headers) {
    for (int i = 0; i < in.size(); i++) {
        Thing thing = in.get(i);
        if (thing == null
                && headers.get(i).get(SerializationUtils.VALUE_DESERIALIZER_EXCEPTION_HEADER) != null) {
            try {
                DeserializationException deserEx = SerializationUtils.byteArrayToDeserializationException(this.logger,
                        headers.get(i).get(SerializationUtils.VALUE_DESERIALIZER_EXCEPTION_HEADER));
                if (deserEx != null) {
                    logger.error(deserEx, "Record at index " + i + " could not be deserialized");
                }
            }
            catch (Exception ex) {
                logger.error(ex, "Record at index " + i + " could not be deserialized");
            }
            throw new BatchListenerFailedException("Deserialization", deserEx, i);
        }
        process(thing);
    }
}

@KafkaListener(id = "kgh2036", topics = "kgh2036")
void listen(List<ConsumerRecord<String, Thing>> in) {
    for (int i = 0; i < in.size(); i++) {
        ConsumerRecord<String, Thing> rec = in.get(i);
        if (rec.value() == null) {
            DeserializationException deserEx = SerializationUtils.getExceptionFromHeader(rec,
                    SerializationUtils.VALUE_DESERIALIZER_EXCEPTION_HEADER, this.logger);
            if (deserEx != null) {
                logger.error(deserEx, "Record at offset " + rec.offset() + " could not be deserialized");
                throw new BatchListenerFailedException("Deserialization", deserEx, i);
            }
        }
        process(rec.value());
    }
}

@Bean
public KafkaListenerContainerFactory<?> kafkaListenerContainerFactory() {
    ConcurrentKafkaListenerContainerFactory<Integer, String> factory =
            new ConcurrentKafkaListenerContainerFactory<>();
    factory.setConsumerFactory(consumerFactory());
    factory.setBatchListener(true);
    factory.setBatchMessageConverter(new BatchMessagingMessageConverter(converter()));
    return factory;
}

@Bean
public JsonMessageConverter converter() {
    return new JsonMessageConverter();
}

@KafkaListener(topics = "blc1")
public void listen(List<Foo> foos, @Header(KafkaHeaders.OFFSET) List<Long> offsets) {
    ...
}

@KafkaListener(topics = "blc3", groupId = "blc3")
public void listen(List<Message<Foo>> fooMessages) {
    ...
}

@Configuration
class CustomKafkaConfig implements KafkaListenerConfigurer {

    @Override
    public void configureKafkaListeners(KafkaListenerEndpointRegistrar registrar) {
        registrar.setCustomMethodArgumentResolvers(
            new HandlerMethodArgumentResolver() {

                @Override
                public boolean supportsParameter(MethodParameter parameter) {
                    return CustomMethodArgument.class.isAssignableFrom(parameter.getParameterType());
                }

                @Override
                public Object resolveArgument(MethodParameter parameter, Message<?> message) {
                    return new CustomMethodArgument(
                        message.getHeaders().get(KafkaHeaders.RECEIVED_TOPIC, String.class)
                    );
                }
            }
        );
    }

}