From: Kai Moritz <kai@juplo.de>
Date: Mon, 11 Nov 2024 20:33:58 +0000 (+0100)
Subject: Version des `spring-producer`, der JSON-Nachrichten sendet
X-Git-Tag: spring/spring-producer--json--2026-03--vor-branchumbenennung--springframework~1
X-Git-Url: https://juplo.de/gitweb/?a=commitdiff_plain;h=d008d1e2165dd0af5c6b6d87dfac7503255e776e;p=demos%2Fkafka%2Ftraining

Version des `spring-producer`, der JSON-Nachrichten sendet
---

diff --git a/README.sh b/README.sh
index 1d208d53..3b52a5dd 100755
--- a/README.sh
+++ b/README.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-IMAGE=juplo/spring-producer:2.0-SNAPSHOT
+IMAGE=juplo/spring-producer:2.0-json-SNAPSHOT
 
 if [ "$1" = "cleanup" ]
 then
diff --git a/build.gradle b/build.gradle
index 60118b63..3e56babb 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,7 +8,7 @@ plugins {
 }
 
 group = 'de.juplo.kafka'
-version = '2.0-SNAPSHOT'
+version = '2.0-json-SNAPSHOT'
 
 java {
 	toolchain {
diff --git a/docker/docker-compose.yml b/docker/docker-compose.yml
index d151dab5..5be08a7b 100644
--- a/docker/docker-compose.yml
+++ b/docker/docker-compose.yml
@@ -173,7 +173,7 @@ services:
       - kafka-3
 
   producer:
-    image: juplo/spring-producer:2.0-SNAPSHOT
+    image: juplo/spring-producer:2.0-json-SNAPSHOT
     environment:
       spring.kafka.bootstrap-servers: kafka:9092
       spring.kafka.client-id: producer
diff --git a/pom.xml b/pom.xml
index 9e11d624..a58adf6e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -15,7 +15,7 @@
   <artifactId>spring-producer</artifactId>
   <name>Spring Producer</name>
   <description>A Simple Producer, based on Spring Boot, that sends messages via Kafka</description>
-  <version>2.0-SNAPSHOT</version>
+  <version>2.0-json-SNAPSHOT</version>
 
   <properties>
     <java.version>21</java.version>
diff --git a/src/main/java/de/juplo/kafka/AddNumberMessage.java b/src/main/java/de/juplo/kafka/AddNumberMessage.java
new file mode 100644
index 00000000..deb6350e
--- /dev/null
+++ b/src/main/java/de/juplo/kafka/AddNumberMessage.java
@@ -0,0 +1,11 @@
+package de.juplo.kafka;
+
+import lombok.Value;
+
+
+@Value
+public class AddNumberMessage implements SumupMessage
+{
+  private final int number;
+  private final int next;
+}
diff --git a/src/main/java/de/juplo/kafka/ApplicationConfiguration.java b/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
index efdfafa1..e212a253 100644
--- a/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
+++ b/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
@@ -19,7 +19,7 @@ public class ApplicationConfiguration
   public ExampleProducer exampleProducer(
     @Value("${spring.kafka.client-id}") String clientId,
     ApplicationProperties properties,
-    Producer<String, String> kafkaProducer,
+    Producer<String, SumupMessage> kafkaProducer,
     ConfigurableApplicationContext applicationContext)
   {
     return
diff --git a/src/main/java/de/juplo/kafka/CalculateSumMessage.java b/src/main/java/de/juplo/kafka/CalculateSumMessage.java
new file mode 100644
index 00000000..6aa0121a
--- /dev/null
+++ b/src/main/java/de/juplo/kafka/CalculateSumMessage.java
@@ -0,0 +1,11 @@
+package de.juplo.kafka;
+
+
+import lombok.Value;
+
+
+@Value
+public class CalculateSumMessage implements SumupMessage
+{
+  private final int number;
+}
diff --git a/src/main/java/de/juplo/kafka/ExampleProducer.java b/src/main/java/de/juplo/kafka/ExampleProducer.java
index 93d0d173..04a0a992 100644
--- a/src/main/java/de/juplo/kafka/ExampleProducer.java
+++ b/src/main/java/de/juplo/kafka/ExampleProducer.java
@@ -13,7 +13,7 @@ public class ExampleProducer implements Runnable
   private final String id;
   private final String topic;
   private final Duration throttle;
-  private final Producer<String, String> producer;
+  private final Producer<String, SumupMessage> producer;
   private final Thread workerThread;
   private final Runnable closeCallback;
 
@@ -25,7 +25,7 @@ public class ExampleProducer implements Runnable
     String id,
     String topic,
     Duration throttle,
-    Producer<String, String> producer,
+    Producer<String, SumupMessage> producer,
     Runnable closeCallback)
   {
     this.id = id;
@@ -43,13 +43,18 @@ public class ExampleProducer implements Runnable
   @Override
   public void run()
   {
-    long i = 0;
+    int i = 0;
 
     try
     {
       for (; running; i++)
       {
-        send(Long.toString(i%10), Long.toString(i));
+        int number = i % 10;
+        SumupMessage message = (i % 7 == 0)
+          ? new CalculateSumMessage(number)
+          : new AddNumberMessage(number, i);
+
+        send(Long.toString(number), message);
 
         if (throttle.isPositive())
         {
@@ -78,11 +83,11 @@ public class ExampleProducer implements Runnable
     }
   }
 
-  void send(String key, String value)
+  void send(String key, SumupMessage value)
   {
     final long sendRequested = System.currentTimeMillis();
 
-    final ProducerRecord<String, String> record = new ProducerRecord<>(
+    final ProducerRecord<String, SumupMessage> record = new ProducerRecord<>(
       topic,  // Topic
       key,    // Key
       value   // Value
diff --git a/src/main/java/de/juplo/kafka/SumupMessage.java b/src/main/java/de/juplo/kafka/SumupMessage.java
new file mode 100644
index 00000000..739efd1e
--- /dev/null
+++ b/src/main/java/de/juplo/kafka/SumupMessage.java
@@ -0,0 +1,5 @@
+package de.juplo.kafka;
+
+public interface SumupMessage
+{
+}
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 3f6c233a..12dc5e8a 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -11,7 +11,11 @@ spring:
       buffer-memory: 33554432
       batch-size: 16384
       compression-type: gzip
+      value-serializer: org.springframework.kafka.support.serializer.JsonSerializer
       properties:
+        spring.json.type.mapping: >-
+          ADD:de.juplo.kafka.AddNumberMessage,
+          CALC:de.juplo.kafka.CalculateSumMessage
         metadata.max.age.ms: 5000
         request.timeout.ms: 5000
         delivery.timeout.ms: 10000