我是kafka的新手。我想在我的春季项目中使用kafka生产者/消费者来替换activeMQ(jms)。我需要的是kafka生产者将我的消息对象发布到某个主题,而消费者则从该主题中订阅它。
首先是我的自定义编码器,与解码器相同(对于我的消息类ConfigurationActionMsg):
@Component
public class ConfigActionMessageEncoder implements Encoder<ConfigurationActionMsg> {
public ConfigActionMessageEncoder() {
/* This constructor must be present for successful compile. */
}
public ConfigActionMessageEncoder(VerifiableProperties verifiableProperties) {
/* This constructor must be present for successful compile. */
}
@Override
public byte[] toBytes(ConfigurationActionMsg actionMsg){
return SerializationUtils.serialize(actionMsg);
}}
以下是我针对处理器和使用者的配置
@Configuration
@ComponentScan(basePackages = {"XXX"})
public class KafkaConfig {
@Bean
public KafkaProducer<String,ConfigurationActionMsg> kafkaProducer(){
Properties props = new Properties();
props.put("zk.connect", "127.0.0.1:2181");
props.put("bootstrap.servers", "localhost:9092");
props.put("acks", "all");
props.put("retries", 0);
props.put("batch.size", 16384);
props.put("linger.ms", 1);
props.put("buffer.memory", 33554432);
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "com.atlas.configengine2.XXX.ConfigActionMessageEncoder");
return new KafkaProducer<>(props);
}
@Bean
public KafkaConsumer<String, ConfigurationActionMsg> kafkaConsumer(){
Properties props = new Properties();
props.put("zk.connect", "127.0.0.1:2181");
props.put("bootstrap.servers", "localhost:9092");
//We should only have one process running for consumer
props.put("group.id", "resolverActionTrigger");
props.put("enable.auto.commit", "true");
props.put("auto.commit.interval.ms", "1000");
props.put("session.timeout.ms", "30000");
props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("value.deserializer", "com.atlas.configengine2.XXX.ConfigActionMessageDecoder");
KafkaConsumer<String, ConfigurationActionMsg> consumer = new KafkaConsumer<>(props);
consumer.subscribe(Arrays.asList("configAction"));
return consumer;
}}
我不确定这是否是实例化生产者/消费者的正确方法。但是这种方式行不通。因为我的kafkaProducer无法实例化。
一些调试信息:
引起原因:org.apache.kafka.common.KafkaException:com.atlas.configengine2.jms.ConfigActionMessageEncoder不是org.apache.kafka.common.serialization.Serializer的实例
但是我不确定这是否是唯一的问题?以及如何编写自定义编码器呢?
你应该实现org.apache.kafka.common.serialization.Serializer
不Encoder
。
请参见CustomSerializer示例。
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