From c4cc9637d8d1d42bff9588dabb5b1278037d60cf Mon Sep 17 00:00:00 2001
From: Kai Moritz <kai@juplo.de>
Date: Tue, 29 Oct 2024 16:48:54 +0100
Subject: [PATCH] Der Producer schreibt gezielt in eine fixe (konfigurierbare)
 Partition

---
 README.sh                                                  | 2 +-
 build.gradle                                               | 2 +-
 docker/docker-compose.yml                                  | 3 ++-
 pom.xml                                                    | 2 +-
 src/main/java/de/juplo/kafka/ApplicationConfiguration.java | 1 +
 src/main/java/de/juplo/kafka/ApplicationProperties.java    | 2 ++
 src/main/java/de/juplo/kafka/ExampleProducer.java          | 4 ++++
 src/main/resources/application.yml                         | 2 ++
 8 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/README.sh b/README.sh
index c8a0b221..ab112868 100755
--- a/README.sh
+++ b/README.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-IMAGE=juplo/spring-producer:1.0-SNAPSHOT
+IMAGE=juplo/spring-producer:1.0-fixedsharding-SNAPSHOT
 
 if [ "$1" = "cleanup" ]
 then
diff --git a/build.gradle b/build.gradle
index 1429c4dd..d60423c5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,7 +8,7 @@ plugins {
 }
 
 group = 'de.juplo.kafka'
-version = '1.0-SNAPSHOT'
+version = '1.0-fixedsharding-SNAPSHOT'
 
 java {
 	toolchain {
diff --git a/docker/docker-compose.yml b/docker/docker-compose.yml
index 00f68fcc..c5b1b5ad 100644
--- a/docker/docker-compose.yml
+++ b/docker/docker-compose.yml
@@ -136,11 +136,12 @@ services:
       - kafka-3
 
   producer:
-    image: juplo/spring-producer:1.0-SNAPSHOT
+    image: juplo/spring-producer:1.0-fixedsharding-SNAPSHOT
     environment:
       juplo.bootstrap-server: kafka:9092
       juplo.client-id: producer
       juplo.producer.topic: test
+      juplo.producer.partition: 0
 
   consumer:
     image: juplo/simple-consumer:1.0-SNAPSHOT
diff --git a/pom.xml b/pom.xml
index f64266b4..7a47d40f 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>1.0-SNAPSHOT</version>
+  <version>1.0-fixedsharding-SNAPSHOT</version>
 
   <properties>
     <java.version>21</java.version>
diff --git a/src/main/java/de/juplo/kafka/ApplicationConfiguration.java b/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
index 0090ceea..ab489256 100644
--- a/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
+++ b/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
@@ -26,6 +26,7 @@ public class ApplicationConfiguration
       new ExampleProducer(
         properties.getClientId(),
         properties.getProducerProperties().getTopic(),
+        properties.getProducerProperties().getPartition(),
         properties.getProducerProperties().getThrottle() == null
           ? Duration.ofMillis(500)
           : properties.getProducerProperties().getThrottle(),
diff --git a/src/main/java/de/juplo/kafka/ApplicationProperties.java b/src/main/java/de/juplo/kafka/ApplicationProperties.java
index 43232628..65b71f3a 100644
--- a/src/main/java/de/juplo/kafka/ApplicationProperties.java
+++ b/src/main/java/de/juplo/kafka/ApplicationProperties.java
@@ -42,6 +42,8 @@ public class ApplicationProperties
     @NotEmpty
     private String topic;
     @NotNull
+    private Integer partition;
+    @NotNull
     @NotEmpty
     private String acks;
     @NotNull
diff --git a/src/main/java/de/juplo/kafka/ExampleProducer.java b/src/main/java/de/juplo/kafka/ExampleProducer.java
index 25e885d9..dabee31a 100644
--- a/src/main/java/de/juplo/kafka/ExampleProducer.java
+++ b/src/main/java/de/juplo/kafka/ExampleProducer.java
@@ -12,6 +12,7 @@ public class ExampleProducer implements Runnable
 {
   private final String id;
   private final String topic;
+  private final int partition;
   private final Duration throttle;
   private final Producer<String, String> producer;
   private final Thread workerThread;
@@ -24,12 +25,14 @@ public class ExampleProducer implements Runnable
   public ExampleProducer(
     String id,
     String topic,
+    int partition,
     Duration throttle,
     Producer<String, String> producer,
     Runnable closeCallback)
   {
     this.id = id;
     this.topic = topic;
+    this.partition = partition;
     this.throttle = throttle;
     this.producer = producer;
 
@@ -84,6 +87,7 @@ public class ExampleProducer implements Runnable
 
     final ProducerRecord<String, String> record = new ProducerRecord<>(
       topic,  // Topic
+      partition, // Partition
       key,    // Key
       value   // Value
     );
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 98ea1284..0f070dd9 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -3,6 +3,7 @@ juplo:
   client-id: DEV
   producer:
     topic: test
+    partition: 0
     acks: -1
     delivery-timeout: 10s
     max-block: 5s
@@ -30,6 +31,7 @@ info:
     client-id: ${juplo.client-id}
     producer:
       topic: ${juplo.producer.topic}
+      partition: ${juplo.producer.partition}
       acks: ${juplo.producer.acks}
       delivery-timeout: ${juplo.producer.delivery-timeout}
       max-block: ${juplo.producer.max-block}
-- 
2.20.1