From: Kai Moritz <kai@juplo.de>
Date: Sun, 27 Oct 2024 11:03:06 +0000 (+0100)
Subject: Der Consumer zählt, wie oft die Schlüssel auftreten
X-Git-Url: http://juplo.de/gitweb/?a=commitdiff_plain;h=b118d961594083c7404bbd8c6ef70bf642158b70;p=demos%2Fkafka%2Ftraining

Der Consumer zählt, wie oft die Schlüssel auftreten
---

diff --git a/src/main/java/de/juplo/kafka/ExampleConsumer.java b/src/main/java/de/juplo/kafka/ExampleConsumer.java
index 59da60b..85b77b9 100644
--- a/src/main/java/de/juplo/kafka/ExampleConsumer.java
+++ b/src/main/java/de/juplo/kafka/ExampleConsumer.java
@@ -8,6 +8,8 @@ import org.apache.kafka.common.errors.WakeupException;
 
 import java.time.Duration;
 import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
 
 
 @Slf4j
@@ -19,6 +21,8 @@ public class ExampleConsumer implements Runnable
   private final Thread workerThread;
   private final Runnable closeCallback;
 
+  private final Map<Integer, Long> counterState = new HashMap<>();
+
   private volatile boolean running = false;
   private long consumed = 0;
 
@@ -94,6 +98,9 @@ public class ExampleConsumer implements Runnable
   {
     consumed++;
     log.info("{} - {}: {}/{} - {}={}", id, offset, topic, partition, key, value);
+    Integer counted = Integer.parseInt(key);
+    Long counter = counterState.compute(counted, (k, v) -> v == null ? 1l : v + 1);
+    log.info("{} - current value for counter {}: {}", id, counted, counter);
   }