refactor: Alle Kafka-Belange in den `WordcountRebalanceListener` verschoben

[demos/kafka/training] / src / main / java / de / juplo / kafka / WordcountRebalanceListener.java

diff --git a/src/main/java/de/juplo/kafka/WordcountRebalanceListener.java b/src/main/java/de/juplo/kafka/WordcountRebalanceListener.java
index 9a69c8f..9f2fc0f 100644 (file)
--- a/src/main/java/de/juplo/kafka/WordcountRebalanceListener.java
+++ b/src/main/java/de/juplo/kafka/WordcountRebalanceListener.java
@@ -3,22 +3,28 @@ package de.juplo.kafka;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.kafka.clients.consumer.Consumer;
-import org.apache.kafka.clients.consumer.ConsumerRebalanceListener;
 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 WordcountRebalanceListener implements ConsumerRebalanceListener
+public class WordcountRebalanceListener implements PollIntervalAwareConsumerRebalanceListener
 {
   private final WordcountRecordHandler 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, String> consumer;
 
+  private Instant lastCommit = Instant.EPOCH;
 
   @Override
   public void onPartitionsAssigned(Collection<TopicPartition> partitions)
@@ -58,4 +64,20 @@ public class WordcountRebalanceListener implements ConsumerRebalanceListener
       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();
+    }
+  }
 }