Merge pull request #21921 from eddumelendez

* gh-21921:
  Reinstate metrics for Kafka Streams

Closes gh-21921

spring-boot-project/spring-boot-actuator-autoconfigure/build.gradle

@@ -67,6 +67,7 @@ dependencies {
 	optional("org.apache.activemq:activemq-broker")
 	optional("org.apache.commons:commons-dbcp2")
 	optional("org.apache.kafka:kafka-clients")
+	optional("org.apache.kafka:kafka-streams")
 	optional("org.apache.tomcat.embed:tomcat-embed-core")
 	optional("org.apache.tomcat.embed:tomcat-embed-el")
 	optional("org.apache.tomcat:tomcat-jdbc")

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/KafkaMetricsAutoConfiguration.java

@@ -18,6 +18,7 @@ package org.springframework.boot.actuate.autoconfigure.metrics;
 
 import io.micrometer.core.instrument.MeterRegistry;
 import io.micrometer.core.instrument.binder.kafka.KafkaClientMetrics;
+import io.micrometer.core.instrument.binder.kafka.KafkaStreamsMetrics;
 
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.AutoConfigureBefore;
@@ -26,19 +27,23 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.kafka.DefaultKafkaConsumerFactoryCustomizer;
 import org.springframework.boot.autoconfigure.kafka.DefaultKafkaProducerFactoryCustomizer;
 import org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration;
+import org.springframework.boot.autoconfigure.kafka.StreamsBuilderFactoryBeanCustomizer;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.kafka.config.StreamsBuilderFactoryBean;
 import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
 import org.springframework.kafka.core.DefaultKafkaProducerFactory;
 import org.springframework.kafka.core.MicrometerConsumerListener;
 import org.springframework.kafka.core.MicrometerProducerListener;
 import org.springframework.kafka.core.ProducerFactory;
+import org.springframework.kafka.streams.KafkaStreamsMicrometerListener;
 
 /**
  * Auto-configuration for Kafka metrics.
  *
  * @author Andy Wilkinson
  * @author Stephane Nicoll
+ * @author Eddú Meléndez
  * @since 2.1.0
  */
 @Configuration(proxyBeanMethods = false)
@@ -66,4 +71,15 @@ public class KafkaMetricsAutoConfiguration {
 		factory.addListener(new MicrometerProducerListener<>(meterRegistry));
 	}
 
+	@Configuration(proxyBeanMethods = false)
+	@ConditionalOnClass({ KafkaStreamsMetrics.class, StreamsBuilderFactoryBean.class })
+	static class KafkaStreamsMetricsAutoConfiguration {
+
+		@Bean
+		StreamsBuilderFactoryBeanCustomizer kafkaStreamsProducerMetrics(MeterRegistry meterRegistry) {
+			return (factoryBean) -> factoryBean.addListener(new KafkaStreamsMicrometerListener(meterRegistry));
+		}
+
+	}
+
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/KafkaMetricsAutoConfigurationTests.java

@@ -22,10 +22,14 @@ import org.springframework.boot.actuate.autoconfigure.metrics.test.MetricsRun;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.kafka.annotation.EnableKafkaStreams;
+import org.springframework.kafka.config.StreamsBuilderFactoryBean;
 import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
 import org.springframework.kafka.core.DefaultKafkaProducerFactory;
 import org.springframework.kafka.core.MicrometerConsumerListener;
 import org.springframework.kafka.core.MicrometerProducerListener;
+import org.springframework.kafka.streams.KafkaStreamsMicrometerListener;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -34,6 +38,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Andy Wilkinson
  * @author Stephane Nicoll
+ * @author Eddú Meléndez
  */
 class KafkaMetricsAutoConfigurationTests {
 
@@ -61,4 +66,33 @@ class KafkaMetricsAutoConfigurationTests {
 		});
 	}
 
+	@Test
+	void whenKafkaStreamsIsEnabledAndThereIsAMeterRegistryThenMetricsListenersAreAdded() {
+		this.contextRunner.withConfiguration(AutoConfigurations.of(KafkaAutoConfiguration.class))
+				.withUserConfiguration(EnableKafkaStreamsConfiguration.class)
+				.withPropertyValues("spring.application.name=my-test-app").with(MetricsRun.simple()).run((context) -> {
+					StreamsBuilderFactoryBean streamsBuilderFactoryBean = context
+							.getBean(StreamsBuilderFactoryBean.class);
+					assertThat(streamsBuilderFactoryBean.getListeners()).hasSize(1)
+							.hasOnlyElementsOfTypes(KafkaStreamsMicrometerListener.class);
+				});
+	}
+
+	@Test
+	void whenKafkaStreamsIsEnabledAndThereIsNoMeterRegistryThenListenerCustomizationBacksOff() {
+		this.contextRunner.withConfiguration(AutoConfigurations.of(KafkaAutoConfiguration.class))
+				.withUserConfiguration(EnableKafkaStreamsConfiguration.class)
+				.withPropertyValues("spring.application.name=my-test-app").run((context) -> {
+					StreamsBuilderFactoryBean streamsBuilderFactoryBean = context
+							.getBean(StreamsBuilderFactoryBean.class);
+					assertThat(streamsBuilderFactoryBean.getListeners()).isEmpty();
+				});
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@EnableKafkaStreams
+	static class EnableKafkaStreamsConfiguration {
+
+	}
+
 }

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

@@ -22,6 +22,7 @@ import org.apache.kafka.streams.StreamsBuilder;
 import org.apache.kafka.streams.StreamsConfig;
 
 import org.springframework.beans.factory.InitializingBean;
+import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
@@ -39,6 +40,7 @@ import org.springframework.kafka.config.StreamsBuilderFactoryBean;
  *
  * @author Gary Russell
  * @author Stephane Nicoll
+ * @author Eddú Meléndez
  */
 @Configuration(proxyBeanMethods = false)
 @ConditionalOnClass(StreamsBuilder.class)
@@ -68,7 +70,9 @@ class KafkaStreamsAnnotationDrivenConfiguration {
 
 	@Bean
 	KafkaStreamsFactoryBeanConfigurer kafkaStreamsFactoryBeanConfigurer(
-			@Qualifier(KafkaStreamsDefaultConfiguration.DEFAULT_STREAMS_BUILDER_BEAN_NAME) StreamsBuilderFactoryBean factoryBean) {
+			@Qualifier(KafkaStreamsDefaultConfiguration.DEFAULT_STREAMS_BUILDER_BEAN_NAME) StreamsBuilderFactoryBean factoryBean,
+			ObjectProvider<StreamsBuilderFactoryBeanCustomizer> customizers) {
+		customizers.orderedStream().forEach((customizer) -> customizer.customize(factoryBean));
 		return new KafkaStreamsFactoryBeanConfigurer(this.properties, factoryBean);
 	}
 

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

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2012-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.kafka;
+
+import org.springframework.kafka.config.StreamsBuilderFactoryBean;
+
+/**
+ * Callback interface for customizing {@code StreamsBuilderFactoryBean} beans.
+ *
+ * @author Eddú Meléndez
+ * @since 2.3.2
+ */
+@FunctionalInterface
+public interface StreamsBuilderFactoryBeanCustomizer {
+
+	/**
+	 * Customize the {@link StreamsBuilderFactoryBean}.
+	 * @param factoryBean the factory bean to customize
+	 */
+	void customize(StreamsBuilderFactoryBean factoryBean);
+
+}