From b9b4f03cc4569888a668f889fbdea220fafec2f1 Mon Sep 17 00:00:00 2001
From: Kai Moritz <kai@juplo.de>
Date: Tue, 12 Nov 2024 03:24:38 +0100
Subject: [PATCH] =?utf8?q?Vorlage=20f=C3=BCr=20die=20=C3=9Cbung=20zum=20`J?=
 =?utf8?q?sonDeserializer`?=
MIME-Version: 1.0
Content-Type: text/plain; charset=utf8
Content-Transfer-Encoding: 8bit

---
 README.sh                                     | 39 -------------------
 .../juplo/kafka/ApplicationConfiguration.java |  8 ++--
 .../java/de/juplo/kafka/ExampleConsumer.java  | 10 ++---
 3 files changed, 8 insertions(+), 49 deletions(-)
 delete mode 100755 README.sh

diff --git a/README.sh b/README.sh
deleted file mode 100755
index 7152ec9..0000000
--- a/README.sh
+++ /dev/null
@@ -1,39 +0,0 @@
-#!/bin/bash
-
-IMAGE=juplo/spring-consumer:1.1-json-SNAPSHOT
-
-if [ "$1" = "cleanup" ]
-then
-  docker compose -f docker/docker-compose.yml down -t0 -v --remove-orphans
-  mvn clean
-  exit
-fi
-
-docker compose -f docker/docker-compose.yml up -d --remove-orphans kafka-1 kafka-2 kafka-3
-docker compose -f docker/docker-compose.yml rm -svf consumer
-
-if [[
-  $(docker image ls -q $IMAGE) == "" ||
-  "$1" = "build"
-]]
-then
-  mvn clean install || exit
-else
-  echo "Using image existing images:"
-  docker image ls $IMAGE
-fi
-
-docker compose -f docker/docker-compose.yml up --remove-orphans setup || exit 1
-
-
-docker compose -f docker/docker-compose.yml up -d producer
-docker compose -f docker/docker-compose.yml up -d consumer
-
-sleep 5
-docker compose -f docker/docker-compose.yml stop consumer
-
-docker compose -f docker/docker-compose.yml start consumer
-sleep 5
-
-docker compose -f docker/docker-compose.yml stop producer consumer
-docker compose -f docker/docker-compose.yml logs consumer
diff --git a/src/main/java/de/juplo/kafka/ApplicationConfiguration.java b/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
index 3f7422c..a4856a6 100644
--- a/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
+++ b/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
@@ -4,7 +4,6 @@ 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;
@@ -19,7 +18,7 @@ public class ApplicationConfiguration
 {
   @Bean
   public ExampleConsumer exampleConsumer(
-      Consumer<String, Message> kafkaConsumer,
+      Consumer<String, String> kafkaConsumer,
       ApplicationProperties properties,
       ConfigurableApplicationContext applicationContext)
   {
@@ -32,7 +31,7 @@ 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());
@@ -49,8 +48,7 @@ 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("spring.json.type.mapping", "ADD:de.juplo.kafka.MessageAddNumber,CALC:de.juplo.kafka.MessageCalculateSum");
+    props.put("value.deserializer", StringDeserializer.class.getName());
 
     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 654ef37..f832b45 100644
--- a/src/main/java/de/juplo/kafka/ExampleConsumer.java
+++ b/src/main/java/de/juplo/kafka/ExampleConsumer.java
@@ -15,7 +15,7 @@ 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;
 
@@ -26,7 +26,7 @@ public class ExampleConsumer implements Runnable
   public ExampleConsumer(
     String clientId,
     String topic,
-    Consumer<String, Message> consumer,
+    Consumer<String, String> consumer,
     Runnable closeCallback)
   {
     this.id = clientId;
@@ -51,11 +51,11 @@ public class ExampleConsumer implements Runnable
 
       while (running)
       {
-        ConsumerRecords<String, Message> records =
+        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(),
@@ -90,7 +90,7 @@ public class ExampleConsumer implements Runnable
     Integer partition,
     Long offset,
     String key,
-    Message value)
+    String value)
   {
     consumed++;
     log.info("{} - {}: {}/{} - {}={}", id, offset, topic, partition, key, value);
-- 
2.20.1