From 2ec6614ba69618102ef5d5fb742d91475c4beba7 Mon Sep 17 00:00:00 2001
From: Kai Moritz <kai@juplo.de>
Date: Sun, 2 Feb 2025 18:49:06 +0100
Subject: [PATCH] =?utf8?q?Vorlage=20f=C3=BCr=20das=20Empfangen=20von=20Nac?=
 =?utf8?q?hrichten=20aus=20einer=20geteilten=20Lib?=
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---
 .../juplo/kafka/ApplicationConfiguration.java |  7 +++---
 .../java/de/juplo/kafka/ExampleConsumer.java  | 22 +++++++++----------
 2 files changed, 14 insertions(+), 15 deletions(-)

diff --git a/src/main/java/de/juplo/kafka/ApplicationConfiguration.java b/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
index 0d043452..825f2b43 100644
--- a/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
+++ b/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
@@ -5,7 +5,6 @@ import org.apache.kafka.clients.consumer.Consumer;
 import org.apache.kafka.clients.consumer.KafkaConsumer;
 import org.apache.kafka.clients.consumer.StickyAssignor;
 import org.apache.kafka.common.serialization.StringDeserializer;
-import org.springframework.kafka.support.serializer.JsonDeserializer;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.Bean;
@@ -20,7 +19,7 @@ public class ApplicationConfiguration
 {
   @Bean
   public ExampleConsumer exampleConsumer(
-    Consumer<String, Message> kafkaConsumer,
+    Consumer<String, String> kafkaConsumer,
     ApplicationProperties properties,
     ConfigurableApplicationContext applicationContext)
   {
@@ -33,7 +32,7 @@ public class ApplicationConfiguration
   }
 
   @Bean(destroyMethod = "")
-  public KafkaConsumer<String, Message> kafkaConsumer(ApplicationProperties properties)
+  public KafkaConsumer<String, String> kafkaConsumer(ApplicationProperties properties)
   {
     Properties props = new Properties();
     props.put("bootstrap.servers", properties.getBootstrapServer());
@@ -50,7 +49,7 @@ public class ApplicationConfiguration
     props.put("metadata.maxage.ms", 5000); //  5 Sekunden
     props.put("partition.assignment.strategy", StickyAssignor.class.getName());
     props.put("key.deserializer", StringDeserializer.class.getName());
-    props.put("value.deserializer", JsonDeserializer.class.getName());
+    props.put("value.deserializer", StringDeserializer.class.getName());
     props.put("spring.json.trusted.packages", "de.juplo.messages");
 
     return new KafkaConsumer<>(props);
diff --git a/src/main/java/de/juplo/kafka/ExampleConsumer.java b/src/main/java/de/juplo/kafka/ExampleConsumer.java
index d4109fc2..9d973b61 100644
--- a/src/main/java/de/juplo/kafka/ExampleConsumer.java
+++ b/src/main/java/de/juplo/kafka/ExampleConsumer.java
@@ -18,7 +18,7 @@ public class ExampleConsumer implements Runnable
 {
   private final String id;
   private final String topic;
-  private final Consumer<String, Message> consumer;
+  private final Consumer<String, String> consumer;
   private final Thread workerThread;
   private final Runnable closeCallback;
 
@@ -28,7 +28,7 @@ public class ExampleConsumer implements Runnable
   public ExampleConsumer(
     String clientId,
     String topic,
-    Consumer<String, Message> consumer,
+    Consumer<String, String> consumer,
     Runnable closeCallback)
   {
     this.id = clientId;
@@ -52,10 +52,10 @@ public class ExampleConsumer implements Runnable
 
       while (true)
       {
-        ConsumerRecords<String, Message> records = consumer.poll(Duration.ofSeconds(1));
+        ConsumerRecords<String, String> records = consumer.poll(Duration.ofSeconds(1));
 
         log.info("{} - Received {} messages", id, records.count());
-        for (ConsumerRecord<String, Message> record : records)
+        for (ConsumerRecord<String, String> record : records)
         {
           handleRecord(
             record.topic(),
@@ -90,16 +90,16 @@ public class ExampleConsumer implements Runnable
     Integer partition,
     Long offset,
     String key,
-    Message value)
+    String value)
   {
     consumed++;
     log.info("{} - partition={}-{}, offset={}: {}={}", id, topic, partition, offset, key, value);
-    switch (value.getType())
-    {
-      case ADD  -> addNumber((Add)value);
-      case CALC -> calcSum((Calculate)value);
-      default   -> log.error("{} - Ignoring message of unknown typ {}", id, value.getType());
-    }
+    // switch (value.getType())
+    // {
+    //   case ADD  -> addNumber((Add)value);
+    //   case CALC -> calcSum((Calculate)value);
+    //   default   -> log.error("{} - Ignoring message of unknown typ {}", id, value.getType());
+    // }
   }
 
   private void addNumber(Add add)
-- 
2.20.1