From: Kai Moritz <kai@juplo.de>
Date: Sun, 10 Nov 2024 13:24:27 +0000 (+0100)
Subject: Vorlage für die Seek-Übung
X-Git-Tag: consumer/spring-consumer--seek--vorlage--2024-11-13--si
X-Git-Url: http://juplo.de/gitweb/?a=commitdiff_plain;h=refs%2Fheads%2Fconsumer%2Fspring-consumer--seek--vorlage;p=demos%2Fkafka%2Ftraining

Vorlage für die Seek-Übung
---

diff --git a/README.sh b/README.sh
deleted file mode 100755
index 3ec6309..0000000
--- a/README.sh
+++ /dev/null
@@ -1,40 +0,0 @@
-#!/bin/bash
-
-IMAGE=juplo/spring-consumer:1.1-seek-SNAPSHOT
-
-if [ "$1" = "cleanup" ]
-then
-  docker compose -f docker/docker-compose.yml down -t0 -v --remove-orphans
-  mvn clean
-  exit
-fi
-
-docker compose -f docker/docker-compose.yml up -d --remove-orphans kafka-1 kafka-2 kafka-3
-docker compose -f docker/docker-compose.yml rm -svf consumer seek
-
-if [[
-  $(docker image ls -q $IMAGE) == "" ||
-  "$1" = "build"
-]]
-then
-  mvn clean install || exit
-else
-  echo "Using image existing images:"
-  docker image ls $IMAGE
-fi
-
-docker compose -f docker/docker-compose.yml up --remove-orphans setup || exit 1
-
-
-docker compose -f docker/docker-compose.yml up -d producer
-docker compose -f docker/docker-compose.yml up -d consumer
-
-sleep 5
-docker compose -f docker/docker-compose.yml stop producer
-docker compose -f docker/docker-compose.yml up -d seek
-sleep 5
-docker compose -f docker/docker-compose.yml stop consumer
-sleep 5
-docker compose -f docker/docker-compose.yml restart seek
-sleep 10
-docker compose -f docker/docker-compose.yml logs seek
diff --git a/src/main/java/de/juplo/kafka/ExampleConsumer.java b/src/main/java/de/juplo/kafka/ExampleConsumer.java
index 8cb3698..b71c4f2 100644
--- a/src/main/java/de/juplo/kafka/ExampleConsumer.java
+++ b/src/main/java/de/juplo/kafka/ExampleConsumer.java
@@ -54,6 +54,21 @@ public class ExampleConsumer implements Runnable, ConsumerRebalanceListener
       consumer.subscribe(Arrays.asList(topic), this);
       running = true;
 
+      log.info("{} - Fetching PartitionInfo for topic {}", id, topic);
+      consumer
+        .partitionsFor(topic)
+        .forEach(info ->
+        {
+          TopicPartition partition = new TopicPartition(topic, info.partition());
+          Long offset = offsets.get(partition);
+          if (offset != null)
+          {
+            log.info("{} - Seeking to offset {} for partition {}", id, offset, partition);
+            consumer.seek(partition, offset);
+            offsets.remove(partition);
+          }
+        });
+
       while (running)
       {
         ConsumerRecords<String, String> records =
@@ -105,16 +120,6 @@ public class ExampleConsumer implements Runnable, ConsumerRebalanceListener
   @Override
   public void onPartitionsAssigned(Collection<TopicPartition> partitions)
   {
-    partitions.forEach(partition ->
-    {
-      Long offset = offsets.get(partition);
-      if (offset != null)
-      {
-        log.info("{} - Seeking to offset {} for partition {}", id, offset, partition);
-        consumer.seek(partition, offset);
-        offsets.remove(partition);
-      }
-    });
   }
 
   @Override