Vorlage

[demos/kafka/training] / src / main / java / de / juplo / kafka / SimpleConsumer.java

diff --git a/src/main/java/de/juplo/kafka/SimpleConsumer.java b/src/main/java/de/juplo/kafka/SimpleConsumer.java
index 586bd07..880ed78 100644 (file)
--- a/src/main/java/de/juplo/kafka/SimpleConsumer.java
+++ b/src/main/java/de/juplo/kafka/SimpleConsumer.java
@@ -28,6 +28,7 @@ public class SimpleConsumer
     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());
@@ -43,29 +44,17 @@ public class SimpleConsumer
   {
     try
     {
-      log.info("{} - Subscribing to topic test", id);
-      consumer.subscribe(Arrays.asList("test"));
+      log.info("{} - Subscribing to topic {}", id, 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)
-        {
-          consumed++;
-          log.info(
-              "{} - {}: {}/{} - {}={}",
-              id,
-              record.offset(),
-              record.topic(),
-              record.partition(),
-              record.key(),
-              record.value()
-          );
-        }
+        // TODO:
+        // * Poll for new records
+        // * Loop through received records
+        // * Count received records in the variable `consumed`
+        // * "Work" with the data: Log partition/offset/key/value
       }
     }
     catch(WakeupException e)
@@ -74,7 +63,7 @@ public class SimpleConsumer
     }
     catch(Exception e)
     {
-      log.error("{} - Unexpected error: {}", id, e.toString());
+      log.error("{} - Unexpected error: {}, unsubscribing!", id, e.toString());
     }
     finally
     {