Die Implementierung speichert Zustand & Offsets vor _jedem_ `poll()`

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

diff --git a/src/main/java/de/juplo/kafka/ApplicationRebalanceListener.java b/src/main/java/de/juplo/kafka/ApplicationRebalanceListener.java
index d319295..86fe68a 100644 (file)
--- a/src/main/java/de/juplo/kafka/ApplicationRebalanceListener.java
+++ b/src/main/java/de/juplo/kafka/ApplicationRebalanceListener.java
@@ -2,7 +2,6 @@ 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.util.*;
@@ -10,18 +9,15 @@ import java.util.*;
 
 @RequiredArgsConstructor
 @Slf4j
-public class ApplicationRebalanceListener implements CommittingConsumerRebalanceListener
+public class ApplicationRebalanceListener implements RebalanceListener
 {
   private final ApplicationRecordHandler recordHandler;
   private final AdderResults adderResults;
   private final StateRepository stateRepository;
   private final String id;
-  private final Consumer consumer;
 
   private final Set<Integer> partitions = new HashSet<>();
 
-  private boolean commitsEnabled = true;
-
   @Override
   public void onPartitionsAssigned(Collection<TopicPartition> partitions)
   {
@@ -34,7 +30,12 @@ public class ApplicationRebalanceListener implements CommittingConsumerRebalance
           stateRepository
               .findById(Integer.toString(partition))
               .orElse(new StateDocument(partition));
-      recordHandler.addPartition(partition, document.state);
+      log.info(
+        "{} - Offset of next unseen message for partition {}: {}",
+        id,
+        partition,
+        document.offset);
+      recordHandler.addPartition(partition, document.state, document.offset);
       for (String user : document.state.keySet())
       {
         log.info(
@@ -51,48 +52,66 @@ public class ApplicationRebalanceListener implements CommittingConsumerRebalance
   @Override
   public void onPartitionsRevoked(Collection<TopicPartition> partitions)
   {
-    if (commitsEnabled)
-    {
-      log.info("{} - Commiting offsets for all previously assigned partitions", id);
-      try
-      {
-        consumer.commitSync();
-      }
-      catch (Exception e)
-      {
-        log.warn("{} - Could not commit offsets in onPartitionsRevoked():", id, e);
-      }
-    }
-
     partitions.forEach(tp ->
     {
       Integer partition = tp.partition();
       log.info("{} - removing partition: {}", id, partition);
       this.partitions.remove(partition);
-      Map<String, AdderResult> state = recordHandler.removePartition(partition);
-      for (String user : state.keySet())
+      ApplicationState state = recordHandler.removePartition(partition);
+      log.info(
+          "{} - offset of next unseen message for partition {} is {}",
+          id,
+          partition,
+          state.getOffset());
+      for (String user : state.getAdderState().keySet())
       {
         log.info(
             "{} - Saved state for partition={}|user={}: {}",
             id,
             partition,
             user,
-            state.get(user));
+            state.getAdderState().get(user));
       }
       Map<String, List<AdderResult>> results = adderResults.removePartition(partition);
-      stateRepository.save(new StateDocument(partition, state, results));
+      stateRepository.save(
+        new StateDocument(
+          partition,
+          state.getAdderState(),
+          results,
+          state.getOffset()));
     });
   }
 
   @Override
-  public void enableCommits()
-  {
-    commitsEnabled = true;
-  }
-
-  @Override
-  public void disableCommits()
+  public void beforeNextPoll()
   {
-    commitsEnabled = false;
+    partitions
+      .stream()
+      .forEach(partition ->
+      {
+        log.info("{} - persisting state & offset for partition: {}", id, partition);
+        ApplicationState state = recordHandler.getState(partition);
+        log.info(
+          "{} - offset of next unseen message for partition {} is {}",
+          id,
+          partition,
+          state.getOffset());
+        for (String user : state.getAdderState().keySet())
+        {
+          log.info(
+            "{} - Saved state for partition={}|user={}: {}",
+            id,
+            partition,
+            user,
+            state.getAdderState().get(user));
+        }
+        Map<String, List<AdderResult>> results = adderResults.getState(partition);
+        stateRepository.save(
+          new StateDocument(
+            partition,
+            state.getAdderState(),
+            results,
+            state.getOffset()));
+      });
   }
 }