From: Kai Moritz <kai@juplo.de>
Date: Mon, 1 Aug 2022 20:40:27 +0000 (+0200)
Subject: Vorlage
X-Git-Tag: grundlagen/simple-producer--vorlage--2024-11-13--si~1
X-Git-Url: http://juplo.de/gitweb/?a=commitdiff_plain;h=2e8f4627d50c49f9ec9260728ee8514fd7b69880;p=demos%2Fkafka%2Ftraining

Vorlage
---

diff --git a/src/main/java/de/juplo/kafka/ExampleProducer.java b/src/main/java/de/juplo/kafka/ExampleProducer.java
index aa014a6..195e38c 100644
--- a/src/main/java/de/juplo/kafka/ExampleProducer.java
+++ b/src/main/java/de/juplo/kafka/ExampleProducer.java
@@ -26,11 +26,7 @@ public class ExampleProducer
     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());
-    props.put("metadata.maxage.ms", 5000);
+    // TODO: Konfiguration für den Producer zusammenstellen
 
     this.id = clientId;
     this.topic = topic;
@@ -66,44 +62,16 @@ public class ExampleProducer
   {
     final long time = System.currentTimeMillis();
 
-    final ProducerRecord<String, String> record = new ProducerRecord<>(
-        topic,  // Topic
-        key,    // Key
-        value   // Value
-    );
-
-    producer.send(record, (metadata, e) ->
-    {
-      long now = System.currentTimeMillis();
-      if (e == null)
-      {
-        // HANDLE SUCCESS
-        produced++;
-        log.debug(
-            "{} - Sent message {}={}, partition={}:{}, timestamp={}, latency={}ms",
-            id,
-            record.key(),
-            record.value(),
-            metadata.partition(),
-            metadata.offset(),
-            metadata.timestamp(),
-            now - time
-        );
-      }
-      else
-      {
-        // HANDLE ERROR
-        log.error(
-            "{} - ERROR for message {}={}, timestamp={}, latency={}ms: {}",
-            id,
-            record.key(),
-            record.value(),
-            metadata == null ? -1 : metadata.timestamp(),
-            now - time,
-            e.toString()
-        );
-      }
-    });
+    ProducerRecord<String, String> record = null;
+    // TODO:
+    //
+    // 1. ProducerRecord<String, String> erzeugen
+    // 2. Record mit producer.send(...) verschicken
+    // Dabei beachten:
+    // * Callback implementieren und Erfolg/Fehler logge
+    // * Tipp: Aktuellen Zeitstempel auch im Callback erzeugen und
+    //   Millisekunden berechnen, die bis zum Senden verstrichen sind:
+    //   long now = System.currentTimeMillis(); // Für: now - time
 
     long now = System.currentTimeMillis();
     log.trace(