import org.apache.kafka.common.errors.WakeupException;
import javax.annotation.PreDestroy;
-import java.time.Clock;
import java.time.Duration;
-import java.time.Instant;
import java.util.*;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
@Slf4j
@RequiredArgsConstructor
-public class EndlessConsumer<K, V> implements ConsumerRebalanceListener, Runnable
+public class EndlessConsumer<K, V> implements Runnable
{
private final ExecutorService executor;
- private final PartitionStatisticsRepository repository;
private final String id;
private final String topic;
- private final Clock clock;
- private final Duration commitInterval;
private final Consumer<K, V> consumer;
- private final java.util.function.Consumer<ConsumerRecord<K, V>> handler;
+ private final PollIntervalAwareConsumerRebalanceListener rebalanceListener;
+ private final RecordHandler<K, V> recordHandler;
private final Lock lock = new ReentrantLock();
private final Condition condition = lock.newCondition();
private Exception exception;
private long consumed = 0;
- private final Map<Integer, Map<String, Long>> seen = new HashMap<>();
-
-
- @Override
- public void onPartitionsRevoked(Collection<TopicPartition> partitions)
- {
- partitions.forEach(tp ->
- {
- Integer partition = tp.partition();
- Long newOffset = consumer.position(tp);
- log.info(
- "{} - removing partition: {}, offset of next message {})",
- id,
- partition,
- newOffset);
- Map<String, Long> removed = seen.remove(partition);
- for (String key : removed.keySet())
- {
- log.info(
- "{} - Seen {} messages for partition={}|key={}",
- id,
- removed.get(key),
- partition,
- key);
- }
- repository.save(new StatisticsDocument(partition, removed, consumer.position(tp)));
- });
- }
-
- @Override
- public void onPartitionsAssigned(Collection<TopicPartition> partitions)
- {
- partitions.forEach(tp ->
- {
- Integer partition = tp.partition();
- Long offset = consumer.position(tp);
- log.info("{} - adding partition: {}, offset={}", id, partition, offset);
- StatisticsDocument document =
- repository
- .findById(Integer.toString(partition))
- .orElse(new StatisticsDocument(partition));
- if (document.offset >= 0)
- {
- // Only seek, if a stored offset was found
- // Otherwise: Use initial offset, generated by Kafka
- consumer.seek(tp, document.offset);
- }
- seen.put(partition, document.statistics);
- });
- }
@Override
try
{
log.info("{} - Subscribing to topic {}", id, topic);
- consumer.subscribe(Arrays.asList(topic), this);
-
- Instant lastCommit = clock.instant();
+ consumer.subscribe(Arrays.asList(topic), rebalanceListener);
while (true)
{
record.value()
);
- handler.accept(record);
+ recordHandler.accept(record);
consumed++;
-
- Integer partition = record.partition();
- String key = record.key() == null ? "NULL" : record.key().toString();
- Map<String, Long> byKey = seen.get(partition);
-
- if (!byKey.containsKey(key))
- byKey.put(key, 0l);
-
- long seenByKey = byKey.get(key);
- seenByKey++;
- byKey.put(key, seenByKey);
}
- if (lastCommit.plus(commitInterval).isBefore(clock.instant()))
- {
- log.debug("Storing data and offsets, last commit: {}", lastCommit);
- seen.forEach((partiton, statistics) -> repository.save(
- new StatisticsDocument(
- partiton,
- statistics,
- consumer.position(new TopicPartition(topic, partiton)))));
- lastCommit = clock.instant();
- }
+ rebalanceListener.beforeNextPoll();
}
}
catch(WakeupException e)
}
}
- public Map<Integer, Map<String, Long>> getSeen()
- {
- return seen;
- }
-
public void start()
{
lock.lock();