import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.consumer.*;
-import org.apache.kafka.common.TopicPartition;
-import org.apache.kafka.common.errors.RecordDeserializationException;
-import org.apache.kafka.common.errors.WakeupException;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.kafka.config.KafkaListenerEndpointRegistry;
-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;
-import java.util.concurrent.locks.Condition;
-import java.util.concurrent.locks.Lock;
-import java.util.concurrent.locks.ReentrantLock;
-import java.util.regex.Pattern;
+import java.util.List;
+import java.util.Optional;
-@Slf4j
@RequiredArgsConstructor
-public class EndlessConsumer implements ConsumerRebalanceListener, Runnable
+@Slf4j
+public class EndlessConsumer<K, V>
{
- final static Pattern PATTERN = Pattern.compile("\\W+");
-
-
- 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<String, String> consumer;
+ private final KafkaListenerEndpointRegistry registry;
+ private final ApplicationErrorHandler errorHandler;
+ private final RecordHandler<K, V> recordHandler;
- private final Lock lock = new ReentrantLock();
- private final Condition condition = lock.newCondition();
- private boolean running = false;
- private Exception exception;
private long consumed = 0;
- private final Map<Integer, Map<String, 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, Map<String, Long>> removed = seen.remove(partition);
- 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
- public void run()
+ @KafkaListener(
+ id = "${spring.kafka.client-id}",
+ idIsGroup = false,
+ topics = "${sumup.adder.topic}",
+ batch = "true",
+ autoStartup = "false")
+ public void accept(List<ConsumerRecord<K, V>> records)
{
- try
- {
- log.info("{} - Subscribing to topic {}", id, topic);
- consumer.subscribe(Arrays.asList(topic), this);
-
- Instant lastCommit = clock.instant();
-
- while (true)
- {
- ConsumerRecords<String, String> records =
- consumer.poll(Duration.ofSeconds(1));
-
// Do something with the data...
- log.info("{} - Received {} messages", id, records.count());
- for (ConsumerRecord<String, String> record : records)
+ log.info("{} - Received {} messages", id, records.size());
+ for (ConsumerRecord<K, V> record : records)
{
log.info(
"{} - {}: {}/{} - {}={}",
record.value()
);
- consumed++;
-
- Integer partition = record.partition();
- String user = record.key();
- Map<String, Map<String, Long>> users = seen.get(partition);
-
- Map<String, Long> words = users.get(user);
- if (words == null)
- {
- words = new HashMap<>();
- users.put(user, words);
- }
+ recordHandler.accept(record);
- for (String word : PATTERN.split(record.value()))
- {
- Long num = words.get(word);
- if (num == null)
- {
- num = 1l;
- }
- else
- {
- num++;
- }
- words.put(word, num);
- }
- }
-
- 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();
+ consumed++;
}
- }
- }
- catch(WakeupException e)
- {
- log.info("{} - RIIING! Request to stop consumption - commiting current offsets!", id);
- shutdown();
- }
- catch(RecordDeserializationException e)
- {
- TopicPartition tp = e.topicPartition();
- long offset = e.offset();
- log.error(
- "{} - Could not deserialize message on topic {} with offset={}: {}",
- id,
- tp,
- offset,
- e.getCause().toString());
-
- shutdown(e);
- }
- catch(Exception e)
- {
- log.error("{} - Unexpected error: {}", id, e.toString(), e);
- shutdown(e);
- }
- finally
- {
- log.info("{} - Consumer-Thread exiting", id);
- }
- }
-
- private void shutdown()
- {
- shutdown(null);
- }
-
- private void shutdown(Exception e)
- {
- lock.lock();
- try
- {
- try
- {
- log.info("{} - Unsubscribing from topic {}", id, topic);
- consumer.unsubscribe();
- }
- catch (Exception ue)
- {
- log.error(
- "{} - Error while unsubscribing from topic {}: {}",
- id,
- topic,
- ue.toString());
- }
- finally
- {
- running = false;
- exception = e;
- condition.signal();
- }
- }
- finally
- {
- lock.unlock();
- }
- }
-
- public Map<Integer, Map<String, Map<String, Long>>> getSeen()
- {
- return seen;
}
public void start()
{
- lock.lock();
- try
- {
- if (running)
- throw new IllegalStateException("Consumer instance " + id + " is already running!");
+ if (running())
+ throw new IllegalStateException("Consumer instance " + id + " is already running!");
- log.info("{} - Starting - consumed {} messages before", id, consumed);
- running = true;
- exception = null;
- executor.submit(this);
- }
- finally
- {
- lock.unlock();
- }
+ log.info("{} - Starting - consumed {} messages before", id, consumed);
+ errorHandler.clearState();
+ registry.getListenerContainer(id).start();
}
- public synchronized void stop() throws InterruptedException
+ public void stop()
{
- lock.lock();
- try
- {
- if (!running)
- throw new IllegalStateException("Consumer instance " + id + " is not running!");
-
- log.info("{} - Stopping", id);
- consumer.wakeup();
- condition.await();
- log.info("{} - Stopped - consumed {} messages so far", id, consumed);
- }
- finally
- {
- lock.unlock();
- }
- }
+ if (!running())
+ throw new IllegalStateException("Consumer instance " + id + " is not running!");
- @PreDestroy
- public void destroy() throws ExecutionException, InterruptedException
- {
- log.info("{} - Destroy!", id);
- log.info("{}: Consumed {} messages in total, exiting!", id, consumed);
+ log.info("{} - Stopping", id);
+ registry.getListenerContainer(id).stop();
+ log.info("{} - Stopped - consumed {} messages so far", id, consumed);
}
public boolean running()
{
- lock.lock();
- try
- {
- return running;
- }
- finally
- {
- lock.unlock();
- }
+ return registry.getListenerContainer(id).isRunning();
}
public Optional<Exception> exitStatus()
{
- lock.lock();
- try
- {
- if (running)
- throw new IllegalStateException("No exit-status available: Consumer instance " + id + " is running!");
+ if (running())
+ throw new IllegalStateException("No exit-status available: Consumer instance " + id + " is running!");
- return Optional.ofNullable(exception);
- }
- finally
- {
- lock.unlock();
- }
+ return errorHandler.getException();
}
}
projects / demos / kafka / training / blobdiff