package de.juplo.kafka;
-import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.consumer.Consumer;
-import org.apache.kafka.clients.consumer.ConsumerRecord;
-import org.apache.kafka.clients.consumer.ConsumerRecords;
-import org.apache.kafka.common.errors.WakeupException;
-
-import java.time.Duration;
-import java.util.Arrays;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.kafka.support.KafkaHeaders;
+import org.springframework.messaging.handler.annotation.Header;
+import org.springframework.messaging.handler.annotation.Payload;
+import org.springframework.stereotype.Component;
@Slf4j
-@RequiredArgsConstructor
-public class SimpleConsumer implements Runnable
+@Component
+public class SimpleConsumer
{
- private final String id;
- private final String topic;
- private final Consumer<String, String> consumer;
-
+ @Value("${spring.kafka.client-id}")
+ private String id;
private long consumed = 0;
-
- @Override
- public void run()
- {
- try
- {
- log.info("{} - Subscribing to topic {}", id, topic);
- consumer.subscribe(Arrays.asList(topic));
-
- while (true)
- {
- ConsumerRecords<String, String> records =
- consumer.poll(Duration.ofSeconds(1));
-
- log.info("{} - Received {} messages", id, records.count());
- for (ConsumerRecord<String, String> record : records)
- {
- handleRecord(
- record.topic(),
- record.partition(),
- record.offset(),
- record.key(),
- record.value());
- }
- }
- }
- catch(WakeupException e)
- {
- log.info("{} - Consumer was signaled to finish its work", id);
- }
- catch(Exception e)
- {
- log.error("{} - Unexpected error: {}, unsubscribing!", id, e.toString());
- consumer.unsubscribe();
- }
- finally
- {
- log.info("{} - Closing the KafkaConsumer", id);
- consumer.close();
- log.info("{}: Consumed {} messages in total, exiting!", id, consumed);
- }
- }
-
private void handleRecord(
String topic,
Integer partition,