1 package de.juplo.kafka.seek;
3 import lombok.extern.slf4j.Slf4j;
4 import org.apache.kafka.clients.consumer.ConsumerRecord;
5 import org.apache.kafka.clients.consumer.ConsumerRecords;
6 import org.apache.kafka.clients.consumer.KafkaConsumer;
7 import org.apache.kafka.common.TopicPartition;
8 import org.apache.kafka.common.errors.WakeupException;
9 import org.apache.kafka.common.serialization.StringDeserializer;
11 import javax.annotation.PreDestroy;
12 import java.time.Duration;
13 import java.util.Arrays;
14 import java.util.Properties;
15 import java.util.concurrent.ExecutionException;
16 import java.util.concurrent.ExecutorService;
17 import java.util.concurrent.Future;
21 public class Consumer implements Runnable
23 private final ExecutorService executor;
24 private final String id;
25 private final String topic;
26 private final KafkaConsumer<Long, String> consumer;
28 private boolean running = false;
30 Future<?> future = null;
34 ExecutorService executor,
35 String bootstrapServer,
40 this.executor = executor;
45 Properties props = new Properties();
46 props.put("bootstrap.servers", bootstrapServer);
47 props.put("group.id", groupId);
48 props.put("client.id", clientId);
49 props.put("commit.interval.ms", 500);
50 props.put("key.deserializer", StringDeserializer.class.getName());
51 props.put("value.deserializer", StringDeserializer.class.getName());
53 consumer = new KafkaConsumer<>(props);
62 log.info("{} - Subscribing to topic test", id);
63 consumer.subscribe(Arrays.asList(topic));
69 log.info("{} - seeking to offset {}", id, offset);
74 new TopicPartition(topic, partition.partition()),
79 ConsumerRecords<Long, String> records = consumer.poll(Duration.ofSeconds(1));
80 for (ConsumerRecord<Long, String> record : records)
82 "{} - {}: {}/{} - {}",
91 catch(WakeupException e)
93 log.info("{} - RIIING!", id);
97 log.error("{} - Unexpected error: {}", id, e.toString());
101 log.info("{} - Unsubscribing...", id);
103 consumer.unsubscribe();
109 public void seek(long offset)
111 this.offset = offset;
115 public synchronized void start()
118 throw new RuntimeException("Consumier instance " + id + " is already running!");
120 log.info("Running {}", id);
122 future = executor.submit(this);
125 public synchronized void stop() throws ExecutionException, InterruptedException
128 throw new RuntimeException("Consumer instance " + id + " is not running!");
130 log.info("Stopping {}", id);
137 public void destroy() throws ExecutionException, InterruptedException
140 log.info("{} - Closing the KafkaConsumer", id);
141 consumer.close(Duration.ofSeconds(3));