Spring-Boot Version des Simple-Consumer

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

diff --git a/src/main/java/de/juplo/kafka/ApplicationConfiguration.java b/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
new file mode 100644 (file)
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+++ b/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
@@ -0,0 +1,43 @@
+package de.juplo.kafka;
+
+import org.apache.kafka.clients.consumer.Consumer;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.common.serialization.StringDeserializer;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import java.util.Properties;
+
+
+@Configuration
+@EnableConfigurationProperties({ ApplicationProperties.class })
+public class ApplicationConfiguration
+{
+  @Bean
+  public SimpleConsumer simpleConsumer(
+      Consumer<String, String> kafkaConsumer,
+      ApplicationProperties applicationProperties)
+  {
+    return
+        new SimpleConsumer(
+            applicationProperties.getClientId(),
+            applicationProperties.getTopic(),
+            kafkaConsumer);
+  }
+
+  @Bean
+  public Consumer<String, String> kafkaConsumer(ApplicationProperties properties)
+  {
+    Properties props = new Properties();
+    props.put("bootstrap.servers", properties.getBootstrapServers());
+    props.put("group.id", properties.getGroupId()); // ID für die Offset-Commits
+    props.put("client.id", properties.getClientId()); // Nur zur Wiedererkennung
+    props.put("auto.offset.reset", properties.getAutoOffsetReset());
+    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());
+
+    return new KafkaConsumer<>(props);
+  }
+}