X-Git-Url: http://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2FEndlessConsumer.java;h=9aa81525b6c9899644600308bb2f23609c44a453;hb=ae2e7a02860a3ac4b26073bf0bf000a84fe894b9;hp=22dce95ee17a7c6c9f089bbe5e9377fe8bdcdba3;hpb=e87f4bb2bc188252955fb4932ddd99161ba621d3;p=demos%2Fkafka%2Ftraining

diff --git a/src/main/java/de/juplo/kafka/EndlessConsumer.java b/src/main/java/de/juplo/kafka/EndlessConsumer.java
index 22dce95..9aa8152 100644
--- a/src/main/java/de/juplo/kafka/EndlessConsumer.java
+++ b/src/main/java/de/juplo/kafka/EndlessConsumer.java
@@ -1,16 +1,17 @@
 package de.juplo.kafka;
 
 import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.clients.consumer.ConsumerRebalanceListener;
 import org.apache.kafka.clients.consumer.ConsumerRecord;
 import org.apache.kafka.clients.consumer.ConsumerRecords;
 import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.common.TopicPartition;
 import org.apache.kafka.common.errors.WakeupException;
 import org.apache.kafka.common.serialization.StringDeserializer;
 
 import javax.annotation.PreDestroy;
 import java.time.Duration;
-import java.util.Arrays;
-import java.util.Properties;
+import java.util.*;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Future;
@@ -25,43 +26,63 @@ public class EndlessConsumer implements Runnable
   private final String groupId;
   private final String id;
   private final String topic;
+  private final String autoOffsetReset;
 
   private AtomicBoolean running = new AtomicBoolean();
   private long consumed = 0;
   private KafkaConsumer<String, String> consumer = null;
   private Future<?> future = null;
 
+  private final Map<Integer, Map<String, Integer>> seen = new HashMap<>();
+
+
   public EndlessConsumer(
       ExecutorService executor,
       String bootstrapServer,
       String groupId,
       String clientId,
-      String topic)
+      String topic,
+      String autoOffsetReset)
   {
     this.executor = executor;
     this.bootstrapServer = bootstrapServer;
     this.groupId = groupId;
     this.id = clientId;
     this.topic = topic;
+    this.autoOffsetReset = autoOffsetReset;
   }
 
   @Override
   public void run()
   {
-    Properties props = new Properties();
-    props.put("bootstrap.servers", bootstrapServer);
-    props.put("group.id", groupId);
-    props.put("client.id", id);
-    props.put("auto.offset.reset", "earliest");
-    props.put("key.deserializer", StringDeserializer.class.getName());
-    props.put("value.deserializer", StringDeserializer.class.getName());
-
-    this.consumer = new KafkaConsumer<>(props);
-
     try
     {
+      Properties props = new Properties();
+      props.put("bootstrap.servers", bootstrapServer);
+      props.put("group.id", groupId);
+      props.put("client.id", id);
+      props.put("auto.offset.reset", autoOffsetReset);
+      props.put("metadata.max.age.ms", "1000");
+      props.put("key.deserializer", StringDeserializer.class.getName());
+      props.put("value.deserializer", StringDeserializer.class.getName());
+
+      this.consumer = new KafkaConsumer<>(props);
+
       log.info("{} - Subscribing to topic {}", id, topic);
-      consumer.subscribe(Arrays.asList(topic));
+      consumer.subscribe(Arrays.asList(topic), new ConsumerRebalanceListener()
+      {
+        @Override
+        public void onPartitionsRevoked(Collection<TopicPartition> partitions)
+        {
+          partitions.forEach(tp -> seen.remove(tp.partition()));
+        }
+
+        @Override
+        public void onPartitionsAssigned(Collection<TopicPartition> partitions)
+        {
+          partitions.forEach(tp -> seen.put(tp.partition(), new HashMap<>()));
+        }
+      });
 
       while (true)
       {
@@ -82,6 +103,17 @@ public class EndlessConsumer implements Runnable
               record.key(),
               record.value()
           );
+
+          Integer partition = record.partition();
+          String key = record.key() == null ? "NULL" : record.key();
+          Map<String, Integer> byKey = seen.get(partition);
+
+          if (!byKey.containsKey(key))
+            byKey.put(key, 0);
+
+          int seenByKey = byKey.get(key);
+          seenByKey++;
+          byKey.put(key, seenByKey);
         }
       }
     }
@@ -91,17 +123,36 @@ public class EndlessConsumer implements Runnable
     }
     catch(Exception e)
     {
-      log.error("{} - Unexpected error: {}", id, e.toString());
+      log.error("{} - Unexpected error: {}", id, e.toString(), e);
       running.set(false); // Mark the instance as not running
     }
     finally
     {
       log.info("{} - Closing the KafkaConsumer", id);
       consumer.close();
+
+      for (Integer partition : seen.keySet())
+      {
+        Map<String, Integer> byKey = seen.get(partition);
+        for (String key : byKey.keySet())
+        {
+          log.info(
+              "{} - Seen {} messages for partition={}|key={}",
+              id,
+              byKey.get(key),
+              partition,
+              key);
+        }
+      }
+
       log.info("{} - Consumer-Thread exiting", id);
     }
   }
 
+  public Map<Integer, Map<String, Integer>> getSeen()
+  {
+    return seen;
+  }
 
   public synchronized void start()
   {