return new ApplicationRecordHandler();
}
+ @Bean
+ public ApplicationRebalanceListener rebalanceListener(
+ ApplicationRecordHandler recordHandler,
+ ApplicationProperties properties)
+ {
+ return new ApplicationRebalanceListener(
+ recordHandler,
+ properties.getClientId());
+ }
+
@Bean
public EndlessConsumer<String, Long> endlessConsumer(
KafkaConsumer<String, Long> kafkaConsumer,
ExecutorService executor,
+ ApplicationRebalanceListener rebalanceListener,
ApplicationRecordHandler recordHandler,
ApplicationProperties properties)
{
properties.getClientId(),
properties.getTopic(),
kafkaConsumer,
+ rebalanceListener,
recordHandler);
}
--- /dev/null
+package de.juplo.kafka;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.clients.consumer.ConsumerRebalanceListener;
+import org.apache.kafka.common.TopicPartition;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+
+
+@RequiredArgsConstructor
+@Slf4j
+public class ApplicationRebalanceListener implements ConsumerRebalanceListener
+{
+ private final ApplicationRecordHandler recordHandler;
+ private final String id;
+
+ @Override
+ public void onPartitionsAssigned(Collection<TopicPartition> partitions)
+ {
+ partitions.forEach(tp ->
+ {
+ Integer partition = tp.partition();
+ log.info("{} - adding partition: {}", id, partition);
+ recordHandler.addPartition(partition, new HashMap<>());
+ });
+ }
+
+ @Override
+ public void onPartitionsRevoked(Collection<TopicPartition> partitions)
+ {
+ partitions.forEach(tp ->
+ {
+ Integer partition = tp.partition();
+ log.info("{} - removing partition: {}", id, partition);
+ Map<String, Long> removed = recordHandler.removePartition(partition);
+ for (String key : removed.keySet())
+ {
+ log.info(
+ "{} - Seen {} messages for partition={}|key={}",
+ id,
+ removed.get(key),
+ partition,
+ key);
+ }
+ });
+ }
+}
{
Integer partition = record.partition();
String key = record.key() == null ? "NULL" : record.key().toString();
-
- if (!state.containsKey(partition))
- state.put(partition, new HashMap<>());
-
Map<String, Long> byKey = state.get(partition);
if (!byKey.containsKey(key))
byKey.put(key, seenByKey);
}
+ public void addPartition(Integer partition, Map<String, Long> statistics)
+ {
+ state.put(partition, statistics);
+ }
+
+ public Map<String, Long> removePartition(Integer partition)
+ {
+ return state.remove(partition);
+ }
+
public Map<Integer, Map<String, Long>> getState()
{
private final String id;
private final String topic;
private final Consumer<K, V> consumer;
+ private final ConsumerRebalanceListener consumerRebalanceListener;
private final RecordHandler<K, V> handler;
private final Lock lock = new ReentrantLock();
try
{
log.info("{} - Subscribing to topic {}", id, topic);
- consumer.subscribe(Arrays.asList(topic));
+ consumer.subscribe(Arrays.asList(topic), consumerRebalanceListener);
while (true)
{
@Autowired
ExecutorService executor;
@Autowired
+ ApplicationRebalanceListener rebalanceListener;
+ @Autowired
ApplicationRecordHandler recordHandler;
EndlessConsumer<String, Long> endlessConsumer;
properties.getClientId(),
properties.getTopic(),
kafkaConsumer,
+ rebalanceListener,
captureOffsetAndExecuteTestHandler);
endlessConsumer.start();