X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2FSimpleConsumer.java;h=880ed78761e0bcde50a2507333fe0e958a4d02c7;hb=6ff05112077432d7538d269e48f8bd49b5a394bc;hp=4e2ca8c93073bd962020c3e8cc3b9e31185e943f;hpb=4c4eaa9bf0d40ca631ac78d3a51c36cfcda4fe6f;p=demos%2Fkafka%2Ftraining

diff --git a/src/main/java/de/juplo/kafka/SimpleConsumer.java b/src/main/java/de/juplo/kafka/SimpleConsumer.java
index 4e2ca8c..880ed78 100644
--- a/src/main/java/de/juplo/kafka/SimpleConsumer.java
+++ b/src/main/java/de/juplo/kafka/SimpleConsumer.java
@@ -4,6 +4,7 @@ import lombok.extern.slf4j.Slf4j;
 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.errors.WakeupException;
 import org.apache.kafka.common.serialization.StringDeserializer;
 
 import java.time.Duration;
@@ -18,9 +19,8 @@ public class SimpleConsumer
   private final String topic;
   private final KafkaConsumer<String, String> consumer;
 
+  private volatile boolean running = false;
   private long consumed = 0;
-  private volatile boolean running = true;
-  private volatile boolean done = false;
 
   public SimpleConsumer(String broker, String topic, String groupId, String clientId)
   {
@@ -28,6 +28,8 @@ public class SimpleConsumer
     props.put("bootstrap.servers", broker);
     props.put("group.id", groupId); // ID für die Offset-Commits
     props.put("client.id", clientId); // Nur zur Wiedererkennung
+    props.put("auto.offset.reset", "earliest"); // Von Beginn an lesen
+    props.put("partition.assignment.strategy", "org.apache.kafka.clients.consumer.CooperativeStickyAssignor");
     props.put("key.deserializer", StringDeserializer.class.getName());
     props.put("value.deserializer", StringDeserializer.class.getName());
 
@@ -42,45 +44,33 @@ public class SimpleConsumer
   {
     try
     {
-      log.info("{} - Subscribing to topic test", id);
-      consumer.subscribe(Arrays.asList("test"));
+      log.info("{} - Subscribing to topic {}", id, topic);
+      // TODO: subscribe!
+      running = true;
 
-      // tag::loop[]
-      while (running)
+      while (true)
       {
-        ConsumerRecords<String, String> records =
-            consumer.poll(Duration.ofSeconds(1));
-
-        // Do something with the data...
-        // end::loop[]
-        log.info("{} - Received {} messages", id, records.count());
-        for (ConsumerRecord<String, String> record : records)
-        {
-          consumed++;
-          log.info(
-              "{} - {}: {}/{} - {}={}",
-              id,
-              record.offset(),
-              record.topic(),
-              record.partition(),
-              record.key(),
-              record.value()
-          );
-        }
-        // tag::loop[]
+        // TODO:
+        // * Poll for new records
+        // * Loop through received records
+        // * Count received records in the variable `consumed`
+        // * "Work" with the data: Log partition/offset/key/value
       }
-      // end::loop[]
+    }
+    catch(WakeupException e)
+    {
+      log.info("{} - Consumer was signaled to finish its work", id);
     }
     catch(Exception e)
     {
-      log.error("{} - Unexpected error: {}", id, e.toString());
+      log.error("{} - Unexpected error: {}, unsubscribing!", id, e.toString());
     }
     finally
     {
+      running = false;
       log.info("{} - Closing the KafkaConsumer", id);
       consumer.close();
       log.info("{}: Consumed {} messages in total, exiting!", id, consumed);
-      done = true;
     }
   }
 
@@ -109,8 +99,9 @@ public class SimpleConsumer
 
     Runtime.getRuntime().addShutdownHook(new Thread(() ->
     {
-      instance.running = false;
-      while (!instance.done)
+      instance.consumer.wakeup();
+
+      while (instance.running)
       {
         log.info("Waiting for main-thread...");
         try