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

diff --git a/src/main/java/de/juplo/kafka/SimpleConsumer.java b/src/main/java/de/juplo/kafka/SimpleConsumer.java
index ef8d7e3..e9ce220 100644 (file)
--- a/src/main/java/de/juplo/kafka/SimpleConsumer.java
+++ b/src/main/java/de/juplo/kafka/SimpleConsumer.java
@@ -1,129 +1,30 @@
 package de.juplo.kafka;
 
 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.serialization.StringDeserializer;
-
-import java.time.Duration;
-import java.util.Arrays;
-import java.util.Properties;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.kafka.support.KafkaHeaders;
+import org.springframework.messaging.handler.annotation.Header;
+import org.springframework.messaging.handler.annotation.Payload;
+import org.springframework.stereotype.Component;
 
 
 @Slf4j
+@Component
 public class SimpleConsumer
 {
-  private final String id;
-  private final String topic;
-  private final KafkaConsumer<String, String> consumer;
-
+  @Value("${spring.kafka.client-id}")
+  private String id;
   private long consumed = 0;
-  private volatile boolean running = true;
-  private volatile boolean done = false;
-
-  public SimpleConsumer(String broker, String topic, String groupId, String clientId)
-  {
-    Properties props = new Properties();
-    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("partition.assignment.strategy", "org.apache.kafka.clients.consumer.CooperativeStickyAssignor");
-    props.put("key.deserializer", StringDeserializer.class.getName());
-    props.put("value.deserializer", StringDeserializer.class.getName());
-
-    consumer = new KafkaConsumer<>(props);
 
-    this.topic = topic;
-    this.id = clientId;
-  }
-
-
-  public void run()
+  private void handleRecord(
+    String topic,
+    Integer partition,
+    Long offset,
+    String key,
+    String value)
   {
-    try
-    {
-      log.info("{} - Subscribing to topic test", id);
-      consumer.subscribe(Arrays.asList("test"));
-
-      while (running)
-      {
-        ConsumerRecords<String, String> records =
-            consumer.poll(Duration.ofSeconds(1));
-
-        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()
-          );
-        }
-      }
-    }
-    catch(Exception e)
-    {
-      log.error("{} - Unexpected error: {}", id, e.toString());
-    }
-    finally
-    {
-      log.info("{} - Closing the KafkaConsumer", id);
-      consumer.close();
-      log.info("{}: Consumed {} messages in total, exiting!", id, consumed);
-      done = true;
-    }
-  }
-
-
-  public static void main(String[] args) throws Exception
-  {
-    String broker = ":9092";
-    String topic = "test";
-    String groupId = "my-group";
-    String clientId = "DEV";
-
-    switch (args.length)
-    {
-      case 4:
-        clientId = args[3];
-      case 3:
-        groupId = args[2];
-      case 2:
-        topic = args[1];
-      case 1:
-        broker = args[0];
-    }
-
-
-    SimpleConsumer instance = new SimpleConsumer(broker, topic, groupId, clientId);
-
-    Runtime.getRuntime().addShutdownHook(new Thread(() ->
-    {
-      instance.running = false;
-      while (!instance.done)
-      {
-        log.info("Waiting for main-thread...");
-        try
-        {
-          Thread.sleep(1000);
-        }
-        catch (InterruptedException e) {}
-      }
-      log.info("Shutdown completed.");
-    }));
-
-    log.info(
-        "Running SimpleConsumer: broker={}, topic={}, group-id={}, client-id={}",
-        broker,
-        topic,
-        groupId,
-        clientId);
-    instance.run();
+    consumed++;
+    log.info("{} - {}: {}/{} - {}={}", id, offset, topic, partition, key, value);
   }
 }