在使用Spring Cloud Streams时，如何在代码中设置Kafka Streams属性？

Question

在Spring Boot with Kafka中，我可以如下设置ConsumerFactory的属性：

@EnableKafka
@Configuration
public class KafkaConsumerConfig {

@Bean
public ConsumerFactory<String, EnrichedOrder> consumerFactory() {
    Map<String, Object> props = new HashMap<>();
    props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
    props.put(ConsumerConfig.GROUP_ID_CONFIG, "barnwaldo");
    props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
    props.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, "1000");
    props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
    props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, EnrichedOrderDeserializer.class);

    return new DefaultKafkaConsumerFactory<>(props);
}

@Bean
public ConcurrentKafkaListenerContainerFactory<String, EnrichedOrder> kafkaListenerContainerFactory() {
    ConcurrentKafkaListenerContainerFactory<String, EnrichedOrder> factory = new ConcurrentKafkaListenerContainerFactory<>();
    factory.setConsumerFactory(consumerFactory());
    return factory;
}

}

使用Kafka Streams，我可以按如下方式在代码中设置属性：

    final Properties streamsConfiguration = new Properties();
    streamsConfiguration.put(StreamsConfig.APPLICATION_ID_CONFIG, "wordcount-lambda-example");
    streamsConfiguration.put(StreamsConfig.CLIENT_ID_CONFIG, "wordcount-lambda-example-client");
    streamsConfiguration.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
    streamsConfiguration.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
    streamsConfiguration.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
    streamsConfiguration.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, 10 * 1000);
    streamsConfiguration.put(StreamsConfig.CACHE_MAX_BYTES_BUFFERING_CONFIG, 0);
    final KafkaStreams streams = new KafkaStreams(builder.build(), streamsConfiguration);

在使用Spring Cloud Streams和Kafka Streams时，所有属性似乎仅通过资源文件夹中的application.properties或application.yml文件输入

spring.cloud.stream.bindings:
    output:
        contentType: application/json
        destination: data2
    input:
        contentType: application/json
        destination: data1
spring.cloud.stream.kafka.streams:
    binder:
      brokers: localhost
      configuration:
        commit.interval.ms: 1000
        default.key.serde: org.apache.kafka.common.serialization.Serdes$StringSerde
        default.value.serde: org.apache.kafka.common.serialization.Serdes$StringSerde
    bindings.input.consumer:
        applicationId: data-tester

在使用Spring Cloud Streams和Kafka Streams时，有没有办法在HashMap或properties中包含属性。

也许这可以通过KafkaMessageChannelBinder或通过扩展AbstractMessageChannelBinder来实现-参见https://github.com/spring-cloud/spring-cloud-stream-binder-kafka/blob/7355ada4613ad50fe95430f1859d4ea65f004be1/spring-cloud-stream-binder-kafka/src/main/java/org/springframework/cloud/stream/binder/kafka/KafkaMessageChannelBinder.java。

我找不到任何与此相关的文档；任何帮助都非常感谢。

Answer 1

默认情况下，它在绑定器级别提供支持，其中属性应以spring.cloud.stream.kafka.streams.binder.文本为前缀

https://cloud.spring.io/spring-cloud-static/Greenwich.M3/multi/multi__apache_kafka_streams_binder.html#_configuration_options_3

如果您看到KafkaStreamsBinderSupportAutoConfiguration类，就可以看到bean配置，它从yaml属性读取并设置为kafka streams。

https://github.com/spring-cloud/spring-cloud-stream-binder-kafka/blob/master/spring-cloud-stream-binder-kafka-streams/src/main/java/org/springframework/cloud/stream/binder/kafka/streams/KafkaStreamsBinderSupportAutoConfiguration.java