kafka 多容器工厂反序列化 kafkaListenerContainerFactory

V2EX = way to explore

V2EX 是一个关于分享和探索的地方

现在注册

已注册用户请登录

• 请不要在回答技术问题时复制粘贴 AI 生成的内容

这是一个创建于 1626 天前的主题，其中的信息可能已经有所发展或是发生改变。

原创

业务需要，批量消费，但是又想批量直接按 List<ModelDTO> 模式直接拉取数据，批量处理。

private final String topic = "queue_notify";

@KafkaListener(topics = topic ,containerFactory = "kafkaLiveListenerContainerFactory") public void listen(List pushLiveDTOS) { Long startTime = System.currentTimeMillis(); //批量个推 pushService.notifyLiveGetui (pushLiveDTOS); Long endTime = System.currentTimeMillis(); }

private final String topic = "queue_push"; //containerFactory 容器工厂方法 @KafkaListener(topics = topic,containerFactory = "kafkaListenerContainerFactory") public void listen(List mallPushMongoDBS) { pushService.saveNoPush(mallPushMongoDBS); } 如上代码

批量拉取不同 topic 获取到 list 的 DTO，进行处理。

package com.dg.mall.push.config;

import com.dg.mall.push.kafka.PushJsonDeserializer; import com.dg.mall.push.kafka.LiveJsonDeserializer; import com.dg.mall.push.kafka.listen.LiveNotifyListener; import com.dg.mall.push.kafka.listen.PushListener; import org.apache.kafka.clients.consumer.ConsumerConfig; import org.apache.kafka.common.serialization.StringDeserializer; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.kafka.annotation.EnableKafka; import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory; import org.springframework.kafka.config.KafkaListenerContainerFactory; import org.springframework.kafka.core.ConsumerFactory; import org.springframework.kafka.core.DefaultKafkaConsumerFactory; import org.springframework.kafka.listener.ConcurrentMessageListenerContainer;

import java.util.HashMap; import java.util.Map;

@Configuration @EnableKafka public class KafkaConsumerConfig {

@Value("${spring.kafka.consumer.bootstrap-servers}")
private String servers;
@Value("${spring.kafka.consumer.enable-auto-commit}")
private boolean enableAutoCommit;
@Value("${spring.kafka.consumer.auto-commit-interval}")
private String autoCommitInterval;
@Value("${spring.kafka.consumer.group-id}")
private String groupId;
@Value("${spring.kafka.consumer.auto-offset-reset}")
private String autoOffsetReset;
@Value("${spring.kafka.consumer.concurrency}")
private int concurrency;
@Value("${spring.kafka.consumer.max-consumer-number}")
private Integer maxConsumerNumber;
@Bean
public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<String, byte[]>> kafkaListenerContainerFactory() {
    ConcurrentKafkaListenerContainerFactory<String, byte[]> factory = new ConcurrentKafkaListenerContainerFactory<>();
    factory.setConsumerFactory(consumerFactory());
    //并发数量
    factory.setConcurrency(concurrency);
    //批量获取
    factory.setBatchListener(true);
    factory.getContainerProperties().setPollTimeout(1500);
    return factory;
}

public ConsumerFactory<String, byte[]> consumerFactory() {
    return new DefaultKafkaConsumerFactory(consumerConfigs(),new StringDeserializer(),new pushJsonDeserializer());
}


public Map<String, Object> consumerConfigs() {
    Map<String, Object> propsMap = new HashMap<>();
    propsMap.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, servers);
    propsMap.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, enableAutoCommit);
    propsMap.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, autoCommitInterval);
    propsMap.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
    //   //这里是反序列化的 pushJsonDeserializer 
    propsMap.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, pushJsonDeserializer.class);
    propsMap.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG, 30000);
    propsMap.put(ConsumerConfig.REQUEST_TIMEOUT_MS_CONFIG,40000);
    propsMap.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
    propsMap.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, autoOffsetReset);
    //最多批量获取 100 个
    propsMap.put(ConsumerConfig.MAX_POLL_RECORDS_CONFIG,maxConsumerNumber);
    return propsMap;
}

@Bean
public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<String, byte[]>> kafkaLiveListenerContainerFactory() {
    ConcurrentKafkaListenerContainerFactory<String, byte[]> factory = new ConcurrentKafkaListenerContainerFactory<>();
    factory.setConsumerFactory(liveConsumerFactory());
    //并发数量
    factory.setConcurrency(concurrency);
    //批量获取
    factory.setBatchListener(true);
    factory.getContainerProperties().setPollTimeout(1500);
    return factory;
}

public ConsumerFactory<String, byte[]> liveConsumerFactory() {
    return new DefaultKafkaConsumerFactory(liveConsumerConfigs(),new StringDeserializer(),new PushLiveJsonDeserializer());
}


public Map<String, Object> liveConsumerConfigs() {
    Map<String, Object> propsMap = new HashMap<>();
    propsMap.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, servers);
    propsMap.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, enableAutoCommit);
    propsMap.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, autoCommitInterval);
    propsMap.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
    //这里是反序列化的 liveJsonDeserializer
    propsMap.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, liveJsonDeserializer.class);
    propsMap.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG, 30000);
    propsMap.put(ConsumerConfig.REQUEST_TIMEOUT_MS_CONFIG,40000);
    propsMap.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
    propsMap.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, autoOffsetReset);
    //最多批量获取 100 个
    propsMap.put(ConsumerConfig.MAX_POLL_RECORDS_CONFIG,maxConsumerNumber);
    return propsMap;
}

@Bean
public PushListener listener() {
    return new PushListener();
}


@Bean
public NotifyListener livelistener() {
    return new NotifyListener();
}

} //反序列化 package com.dg.mall.push.kafka;

import com.dg.mall.push.model.message.PushLiveDTO; import com.gexin.fastjson.JSON; import org.apache.kafka.common.serialization.Deserializer;

import java.util.Map;

public class LiveJsonDeserializer implements Deserializer<PushLiveDTO> {

@Override
public void configure(Map<String, ?> configs, boolean isKey) {

}

@Override
public PushLiveDTO deserialize(String topic, byte[] data) {
    return JSON.parseObject(data, PushLiveDTO.class);
}

@Override
public void close() {

}

} //反序列化 package com.dg.mall.push.kafka;

import com.dg.mall.push.model.message.MallPushMongoDB; import com.gexin.fastjson.JSON; import org.apache.kafka.common.serialization.Serializer;

import java.util.Map;

public class MallPushJsonSerializer implements Serializer<MallPushMongoDB> {

@Override
public void configure(Map<String, ?> configs, boolean isKey) {

}

@Override
public byte[] serialize(String topic, MallPushMongoDB data) {
    return JSON.toJSONBytes(data);
}

@Override
public void close() {

}

}

总结消费

@KafkaListener(topics = topic ,containerFactory = "kafkaLiveListenerContainerFactory") 监听消费一定要加 containerFactory 对应容器工厂类，容器工厂类里面有个反序列化，需要替换，一般都是 String 反序列化，这里我们替换成我们自己创建的 DTO，在来进行反序列化 LiveJsonDeserializer 。

最后的最后监听消费批量获取的时候

数据就这样全部获取到了。

end!

1 条回复 • 2020-07-15 16:33:55 +08:00

qw564518158

2020-07-15 16:33:55 +08:00

竟然没有人，尴尬了