-package de.juplo.kafka;
-
-import lombok.RequiredArgsConstructor;
-import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.consumer.Consumer;
-import org.apache.kafka.common.TopicPartition;
-
-import java.time.Clock;
-import java.time.Duration;
-import java.time.Instant;
-import java.util.Collection;
-import java.util.Map;
-
-
-@RequiredArgsConstructor
-@Slf4j
-public class KeyCountingRebalanceListener implements PollIntervalAwareConsumerRebalanceListener
-{
- private final KeyCountingRecordHandler handler;
- private final PartitionStatisticsRepository repository;
- private final String id;
- private final String topic;
- private final Clock clock;
- private final Duration commitInterval;
- private final Consumer<String, Long> consumer;
-
- private Instant lastCommit = Instant.EPOCH;
-
- @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);
- }
- handler.addPartition(partition, document.statistics);
- });
- }
-
- @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 = handler.removePartition(partition);
- repository.save(new StatisticsDocument(partition, removed, consumer.position(tp)));
- });
- }
-
-
- @Override
- public void beforeNextPoll()
- {
- if (lastCommit.plus(commitInterval).isBefore(clock.instant()))
- {
- log.debug("Storing data and offsets, last commit: {}", lastCommit);
- handler.getSeen().forEach((partiton, statistics) -> repository.save(
- new StatisticsDocument(
- partiton,
- statistics,
- consumer.position(new TopicPartition(topic, partiton)))));
- lastCommit = clock.instant();
- }
- }
-}