From: Kai Moritz <kai@juplo.de>
Date: Tue, 22 Nov 2022 18:29:32 +0000 (+0100)
Subject: Vorlage
X-Git-Tag: grundlagen/simple-consumer--vorlage--2024-11-13--si
X-Git-Url: http://juplo.de/gitweb/?a=commitdiff_plain;h=refs%2Fheads%2Fgrundlagen%2Fsimple-consumer--vorlage;p=demos%2Fkafka%2Ftraining

Vorlage
---

diff --git a/src/main/java/de/juplo/kafka/ExampleConsumer.java b/src/main/java/de/juplo/kafka/ExampleConsumer.java
index 7fbd5de..3634875 100644
--- a/src/main/java/de/juplo/kafka/ExampleConsumer.java
+++ b/src/main/java/de/juplo/kafka/ExampleConsumer.java
@@ -30,14 +30,7 @@ public class ExampleConsumer
     String clientId)
   {
     Properties props = new Properties();
-    props.put("bootstrap.servers", broker);
-    props.put("group.id", groupId); // ID für die Offset-Commits
-    props.put("client.id", clientId); // Nur zur Wiedererkennung
-    props.put("auto.offset.reset", "earliest"); // Von Beginn an lesen
-    props.put("partition.assignment.strategy", "org.apache.kafka.clients.consumer.CooperativeStickyAssignor");
-    props.put("key.deserializer", StringDeserializer.class.getName());
-    props.put("value.deserializer", StringDeserializer.class.getName());
-    props.put("metadata.maxage.ms", 5000);
+    // Konfiguration für den Consumer zusammenstellen
 
     this.id = clientId;
     this.topic = topic;
@@ -50,24 +43,15 @@ public class ExampleConsumer
     try
     {
       log.info("{} - Subscribing to topic {}", id, topic);
-      consumer.subscribe(Arrays.asList(topic));
+      // TODO: subscribe!
       running = true;
 
       while (true)
       {
-        ConsumerRecords<String, String> records =
-            consumer.poll(Duration.ofSeconds(1));
-
-        log.info("{} - Received {} messages", id, records.count());
-        for (ConsumerRecord<String, String> record : records)
-        {
-          handleRecord(
-            record.topic(),
-            record.partition(),
-            record.offset(),
-            record.key(),
-            record.value());
-        }
+        // TODO:
+        // Über consumer.poll() Nachrichten abrufen und für die
+        // empfangenen Nachrichten die Methode handleRecord
+        // aufrufen.
       }
     }
     catch(WakeupException e)
@@ -77,7 +61,6 @@ public class ExampleConsumer
     catch(Exception e)
     {
       log.error("{} - Unexpected error, unsubscribing!", id, e);
-      consumer.unsubscribe();
     }
     finally
     {