import java.time.Clock;
import java.time.Duration;
import java.time.Instant;
-import java.util.Collection;
-import java.util.Map;
+import java.util.*;
@RequiredArgsConstructor
@Slf4j
-public class ApplicationRebalanceListener implements PollIntervalAwareConsumerRebalanceListener
+public class ApplicationRebalanceListener implements RebalanceListener
{
private final ApplicationRecordHandler recordHandler;
+ private final AdderResults adderResults;
private final StateRepository stateRepository;
private final String id;
private final String topic;
private final Clock clock;
private final Duration commitInterval;
- private final Consumer<String, String> consumer;
+ private final Consumer consumer;
+
+ private final Set<Integer> partitions = new HashSet<>();
private Instant lastCommit = Instant.EPOCH;
private boolean commitsEnabled = true;
partitions.forEach(tp ->
{
Integer partition = tp.partition();
+ log.info("{} - adding partition: {}", id, partition);
+ this.partitions.add(partition);
StateDocument document =
stateRepository
.findById(Integer.toString(partition))
.orElse(new StateDocument(partition));
- log.info("{} - adding partition: {}, offset={}", id, partition, document.offset);
if (document.offset >= 0)
{
// Only seek, if a stored offset was found
// Otherwise: Use initial offset, generated by Kafka
consumer.seek(tp, document.offset);
+ log.info(
+ "{} - Seeking to offset {} for partition {}",
+ id,
+ document.offset,
+ partition);
}
recordHandler.addPartition(partition, document.state);
+ for (String user : document.state.keySet())
+ {
+ log.info(
+ "{} - Restored state for partition={}|user={}: {}",
+ id,
+ partition,
+ user,
+ document.state.get(user));
+ }
+ adderResults.addPartition(partition, document.results);
});
}
partitions.forEach(tp ->
{
Integer partition = tp.partition();
- Long offset = consumer.position(tp);
- log.info(
- "{} - removing partition: {}, offset of next message {})",
- id,
- partition,
- offset);
+ log.info("{} - removing partition: {}", id, partition);
+ this.partitions.remove(partition);
if (commitsEnabled)
{
- Map<String, AdderResult> removed = recordHandler.removePartition(partition);
- stateRepository.save(new StateDocument(partition, removed, offset));
+ Map<String, AdderResult> state = recordHandler.removePartition(partition);
+ Long offset = consumer.position(tp);
+ log.info(
+ "{} - offset of next unseen message for partition {} is {}",
+ id,
+ partition,
+ offset);
+ for (String user : state.keySet())
+ {
+ log.info(
+ "{} - Saved state for partition={}|user={}: {}",
+ id,
+ partition,
+ user,
+ state.get(user));
+ }
+ Map<String, List<AdderResult>> results = adderResults.removePartition(partition);
+ stateRepository.save(new StateDocument(partition, state, results, offset));
}
else
{
- log.info("Offset commits are disabled! Last commit: {}", lastCommit);
+ log.info("{} - Offset commits are disabled! Last commit: {}", id, lastCommit);
}
});
}
{
if (!commitsEnabled)
{
- log.info("Offset commits are disabled! Last commit: {}", lastCommit);
+ log.info("{} - Offset commits are disabled! Last commit: {}", id, lastCommit);
return;
}
if (lastCommit.plus(commitInterval).isBefore(clock.instant()))
{
- log.debug("Storing data and offsets, last commit: {}", lastCommit);
- recordHandler.getState().forEach((partiton, adder) -> stateRepository.save(
- new StateDocument(
- partiton,
- adder.getState(),
- consumer.position(new TopicPartition(topic, partiton)))));
+ partitions
+ .stream()
+ .forEach(partition ->
+ {
+ log.info("{} - persisting state & offset for partition: {}", id, partition);
+ Map<String, AdderResult> state = recordHandler.getState(partition).getState();
+ Long offset = consumer.position(new TopicPartition(topic, partition));
+ log.info(
+ "{} - offset of next unseen message for partition {} is {}",
+ id,
+ partition,
+ offset);
+ for (String user : state.keySet())
+ {
+ log.info(
+ "{} - Saved state for partition={}|user={}: {}",
+ id,
+ partition,
+ user,
+ state.get(user));
+ }
+ Map<String, List<AdderResult>> results = adderResults.getState(partition);
+ stateRepository.save(new StateDocument(partition, state, results, offset));
+ });
+
lastCommit = clock.instant();
}
}