X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fseek%2FConsumer.java;h=77e156b2ced1eec1cd85c9c37156a13f86e39fcf;hb=HEAD;hp=1fb4cdd3cda19042da0587c7e49c75cf2bb28665;hpb=2022198b31ce426538388105dc26114ad393739b;p=demos%2Fkafka%2Fseek

diff --git a/src/main/java/de/juplo/kafka/seek/Consumer.java b/src/main/java/de/juplo/kafka/seek/Consumer.java
index 1fb4cdd..77e156b 100644
--- a/src/main/java/de/juplo/kafka/seek/Consumer.java
+++ b/src/main/java/de/juplo/kafka/seek/Consumer.java
@@ -26,6 +26,7 @@ public class Consumer implements Runnable
   private final KafkaConsumer<Long, String> consumer;
 
   private boolean running = false;
+  Long offset = null;
   Future<?> future = null;
 
 
@@ -45,6 +46,7 @@ public class Consumer implements Runnable
     props.put("bootstrap.servers", bootstrapServer);
     props.put("group.id", groupId);
     props.put("client.id", clientId);
+    props.put("commit.interval.ms", 500);
     props.put("key.deserializer", StringDeserializer.class.getName());
     props.put("value.deserializer", StringDeserializer.class.getName());
 
@@ -55,16 +57,25 @@ public class Consumer implements Runnable
   @Override
   public void run()
   {
-    log.info("{} - Subscribing to topic test", id);
-    consumer.subscribe(Arrays.asList(topic));
-
     try
     {
-
-      running = true;
+      log.info("{} - Subscribing to topic test", id);
+      consumer.subscribe(Arrays.asList(topic));
 
       while (running)
       {
+        if (offset != null)
+        {
+          log.info("{} - seeking to offset {}", id, offset);
+          consumer
+              .partitionsFor(topic)
+              .forEach(partition ->
+                  consumer.seek(
+                      new TopicPartition(topic, partition.partition()),
+                      offset));
+          offset = null;
+        }
+
         ConsumerRecords<Long, String> records = consumer.poll(Duration.ofSeconds(1));
         for (ConsumerRecord<Long, String> record : records)
           log.info(
@@ -88,20 +99,16 @@ public class Consumer implements Runnable
     finally
     {
       log.info("{} - Unsubscribing...", id);
-      consumer.unsubscribe();
       running = false;
+      consumer.unsubscribe();
+      offset = null;
     }
   }
 
 
   public void seek(long offset)
   {
-    consumer
-        .partitionsFor(topic)
-        .forEach(partition ->
-            consumer.seek(
-                new TopicPartition(topic, partition.partition()),
-                offset));
+    this.offset = offset;
   }
 
 
@@ -111,13 +118,14 @@ public class Consumer implements Runnable
       throw new RuntimeException("Consumier instance " + id + " is already running!");
 
     log.info("Running {}", id);
+    running = true;
     future = executor.submit(this);
   }
 
   public synchronized void stop() throws ExecutionException, InterruptedException
   {
     if (!running)
-      throw new RuntimeException("Consumier instance " + id + " is not running!");
+      throw new RuntimeException("Consumer instance " + id + " is not running!");
 
     log.info("Stopping {}", id);
     running = false;
@@ -125,7 +133,6 @@ public class Consumer implements Runnable
     future.get();
   }
 
-
   @PreDestroy
   public void destroy() throws ExecutionException, InterruptedException
   {