Add KafkaStream's CleanupConfig properties

Author: Adrien Bennadji

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/kafka/KafkaProperties.java

@@ -37,6 +37,7 @@
 import org.springframework.boot.context.properties.PropertyMapper;
 import org.springframework.boot.convert.DurationUnit;
 import org.springframework.core.io.Resource;
+import org.springframework.kafka.core.CleanupConfig;
 import org.springframework.kafka.listener.ContainerProperties.AckMode;
 import org.springframework.kafka.security.jaas.KafkaJaasLoginModuleInitializer;
 import org.springframework.util.CollectionUtils;
@@ -722,6 +723,11 @@ public static class Streams {
 		 */
 		private String stateDir;
 
+		/**
+		 * Cleanup configuration for the state stores.
+		 */
+		private Cleanup cleanup;
+
 		/**
 		 * Additional Kafka properties used to configure the streams.
 		 */
@@ -791,6 +797,14 @@ public void setStateDir(String stateDir) {
 			this.stateDir = stateDir;
 		}
 
+		public Cleanup getCleanup() {
+			return cleanup;
+		}
+
+		public void setCleanup(Cleanup cleanup) {
+			this.cleanup = cleanup;
+		}
+
 		public Map<String, String> getProperties() {
 			return this.properties;
 		}
@@ -1259,6 +1273,31 @@ public byte id() {
 
 	}
 
+	public static class Cleanup {
+
+		/**
+		 * Cleanup the application's state on start.
+		 */
+		private boolean onStart = false;
+
+		/**
+		 * Cleanup the application's state on stop.
+		 */
+		private boolean onStop = true;
+
+		public CleanupConfig buildCleanupConfig() {
+			return new CleanupConfig(this.onStart, this.onStop);
+		}
+
+		public boolean isOnStart() {
+			return onStart;
+		}
+
+		public boolean isOnStop() {
+			return onStop;
+		}
+	}
+
 	@SuppressWarnings("serial")
 	private static class Properties extends HashMap<String, Object> {
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/kafka/KafkaStreamsAnnotationDrivenConfiguration.java

@@ -91,6 +91,11 @@ static class KafkaStreamsFactoryBeanConfigurer implements InitializingBean {
 		@Override
 		public void afterPropertiesSet() {
 			this.factoryBean.setAutoStartup(this.properties.getStreams().isAutoStartup());
+
+			KafkaProperties.Cleanup cleanup = this.properties.getStreams().getCleanup();
+			if (cleanup != null) {
+				this.factoryBean.setCleanupConfig(cleanup.buildCleanupConfig());
+			}
 		}
 
 	}

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -1588,7 +1588,7 @@ bom {
 			]
 		}
 	}
-	library("Spring Kafka", "2.6.1") {
+	library("Spring Kafka", "2.6.2-SNAPSHOT") {
 		group("org.springframework.kafka") {
 			modules = [
 				"spring-kafka",