From: Kai Moritz <kai@juplo.de>
Date: Sun, 15 Mar 2026 08:59:14 +0000 (+0100)
Subject: Vorlage (für das Bauen des Producers als Docker-Image)
X-Git-Tag: grundlagen/simple-producer--image--vorlage--2026-03--vor-branchumbenennung--springframework
X-Git-Url: https://juplo.de/gitweb/?a=commitdiff_plain;h=f309cb020a966e337e980afce83bfaf51ef18670;p=demos%2Fkafka%2Ftraining

Vorlage (für das Bauen des Producers als Docker-Image)
---

diff --git a/README.sh b/README.sh
deleted file mode 100755
index 3d98ace7..00000000
--- a/README.sh
+++ /dev/null
@@ -1,36 +0,0 @@
-#!/bin/bash
-
-IMAGE=juplo/simple-producer:1.0-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 producer
-
-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
-sleep 5
-
-docker compose -f docker/docker-compose.yml exec cli kafkacat -b kafka:9092 -t test -c 20 -f'topic=%t\tpartition=%p\toffset=%o\tkey=%k\tvalue=%s\n'
-
-docker compose -f docker/docker-compose.yml stop producer
-docker compose -f docker/docker-compose.yml exec cli kafkacat -b kafka:9092 -t test -e -f'topic=%t\tpartition=%p\toffset=%o\tkey=%k\tvalue=%s\n'
-docker compose -f docker/docker-compose.yml logs producer
diff --git a/src/main/java/de/juplo/kafka/ExampleProducer.java b/src/main/java/de/juplo/kafka/ExampleProducer.java
index 60424bc3..ad713726 100644
--- a/src/main/java/de/juplo/kafka/ExampleProducer.java
+++ b/src/main/java/de/juplo/kafka/ExampleProducer.java
@@ -25,15 +25,14 @@ public class ExampleProducer
     String topic,
     String clientId)
   {
-    Properties props = new Properties();
-    props.put("bootstrap.servers", broker);
-    props.put("client.id", clientId); // Nur zur Wiedererkennung
-    props.put("key.serializer", StringSerializer.class.getName());
-    props.put("value.serializer", StringSerializer.class.getName());
+    // TODO:
+    // Instanziierung des KafkaProducer aus Ihrer bisherigen Implementierung
+    // Hier:
+    // - Instanz in this.producer ablegen
+    // - Das Attribut broker des Konstruktors für bootstrap.servers verwenden
 
     this.id = clientId;
     this.topic = topic;
-    producer = new KafkaProducer<>(props);
   }
 
   public void run()
@@ -44,8 +43,9 @@ public class ExampleProducer
     {
       for (; running; i++)
       {
-        send(Long.toString(i%10), Long.toString(i));
-        Thread.sleep(500);
+        // Versenden der Nachrichten aus Ihrer bisherigen Implementierung
+        // Hier:
+        // - Zählen Sie außerdem die versendeten Nachrichten in this.produced
       }
     }
     catch (Exception e)
@@ -54,65 +54,11 @@ public class ExampleProducer
     }
     finally
     {
-      log.info("{}: Closing the KafkaProducer", id);
-      producer.close();
       log.info("{}: Produced {} messages in total, exiting!", id, produced);
       done = true;
     }
   }
 
-  void send(String key, String value)
-  {
-    final long sendRequested = System.currentTimeMillis();
-
-    final ProducerRecord<String, String> record = new ProducerRecord<>(
-      topic,  // Topic
-      key,    // Key
-      value   // Value
-    );
-
-    producer.send(record, (metadata, e) ->
-    {
-      long sendRequestProcessed = System.currentTimeMillis();
-      if (e == null)
-      {
-        // HANDLE SUCCESS
-        log.debug(
-          "{} - Sent message {}={}, partition={}, offset={}, timestamp={}, latency={}ms",
-          id,
-          key,
-          value,
-          metadata.partition(),
-          metadata.offset(),
-          metadata.timestamp(),
-          sendRequestProcessed - sendRequested
-        );
-      }
-      else
-      {
-        // HANDLE ERROR
-        log.error(
-          "{} - ERROR for message {}={}, latency={}ms: {}",
-          id,
-          key,
-          value,
-          sendRequestProcessed - sendRequested,
-          e.toString()
-        );
-      }
-    });
-
-    long sendRequestQueued = System.currentTimeMillis();
-    produced++;
-    log.trace(
-      "{} - Queued message {}={}, latency={}ms",
-      id,
-      key,
-      value,
-      sendRequestQueued - sendRequested
-    );
-  }
-
 
   public static void main(String[] args) throws Exception
   {