Add auto-configuration for Hibernate metrics

All Hibernate entityManagerFactories are automatically instrumented
and their statistics are included into Micrometer using its
HibernateMetrics binder.

Closes gh-12550

spring-boot-project/spring-boot-actuator-autoconfigure/pom.xml

@@ -172,6 +172,11 @@
 			<artifactId>javax.servlet-api</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>org.hibernate</groupId>
+			<artifactId>hibernate-core</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>net.sf.ehcache</groupId>
 			<artifactId>ehcache</artifactId>
@@ -440,6 +445,11 @@
 			<artifactId>jsonassert</artifactId>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-orm</artifactId>
+			<scope>test</scope>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework.data</groupId>
 			<artifactId>spring-data-elasticsearch</artifactId>

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/orm/jpa/HibernateMetricsAutoConfiguration.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright 2012-2018 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
+ *
+ *      http://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.actuate.autoconfigure.metrics.orm.jpa;
+
+import java.util.Collections;
+import java.util.Map;
+
+import javax.persistence.EntityManagerFactory;
+
+import io.micrometer.core.instrument.MeterRegistry;
+import io.micrometer.core.instrument.binder.jpa.HibernateMetrics;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.actuate.autoconfigure.metrics.MetricsAutoConfiguration;
+import org.springframework.boot.actuate.autoconfigure.metrics.export.simple.SimpleMetricsExportAutoConfiguration;
+import org.springframework.boot.autoconfigure.AutoConfigureAfter;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.util.StringUtils;
+
+/**
+ * {@link EnableAutoConfiguration Auto-configuration} for metrics on all available
+ * Hibernate {@link EntityManagerFactory entityManagerFactories} with statistics enabled.
+ * <p>
+ * {@link HibernateMetrics} can only monitor Hibernate {@link EntityManagerFactory}
+ * instances with statistics enabled (for instance, by setting JPA property
+ * <code>hibernate.generate_statistics</code> to <code>true</code>).
+ *
+ * @author Rui Figueira
+ */
+@Configuration
+@AutoConfigureAfter({ MetricsAutoConfiguration.class, HibernateJpaAutoConfiguration.class,
+		SimpleMetricsExportAutoConfiguration.class })
+@ConditionalOnBean({ EntityManagerFactory.class, MeterRegistry.class })
+public class HibernateMetricsAutoConfiguration {
+
+	private static final String ENTITY_MANAGER_FACTORY_SUFFIX = "entityManagerFactory";
+
+	private final MeterRegistry registry;
+
+	public HibernateMetricsAutoConfiguration(MeterRegistry registry) {
+		this.registry = registry;
+	}
+
+	@Autowired
+	public void bindEntityManagerFactoriesToRegistry(
+			Map<String, EntityManagerFactory> entityManagerFactories) {
+		entityManagerFactories.forEach(this::maybeBindEntityManagerFactoryToRegistry);
+	}
+
+	private void maybeBindEntityManagerFactoryToRegistry(String beanName,
+			EntityManagerFactory entityManagerFactory) {
+		String entityManagerFactoryName = getEntityManagerFactoryName(beanName);
+		// HibernateMetrics internally checks if statistics are enabled before binding
+		new HibernateMetrics(entityManagerFactory, entityManagerFactoryName,
+				Collections.emptyList()).bindTo(this.registry);
+	}
+
+	/**
+	 * Get the name of a {@link EntityManagerFactory} based on its {@code beanName}.
+	 * @param beanName the name of the {@link EntityManagerFactory} bean
+	 * @return a name for the given entity manager factory
+	 */
+	private String getEntityManagerFactoryName(String beanName) {
+		if (beanName.length() > ENTITY_MANAGER_FACTORY_SUFFIX.length() && StringUtils
+				.endsWithIgnoreCase(beanName, ENTITY_MANAGER_FACTORY_SUFFIX)) {
+			return beanName.substring(0,
+					beanName.length() - ENTITY_MANAGER_FACTORY_SUFFIX.length());
+		}
+		return beanName;
+	}
+
+}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -49,6 +49,7 @@ org.springframework.boot.actuate.autoconfigure.metrics.export.signalfx.SignalFxM
 org.springframework.boot.actuate.autoconfigure.metrics.export.statsd.StatsdMetricsExportAutoConfiguration,\
 org.springframework.boot.actuate.autoconfigure.metrics.export.wavefront.WavefrontMetricsExportAutoConfiguration,\
 org.springframework.boot.actuate.autoconfigure.metrics.jdbc.DataSourcePoolMetricsAutoConfiguration,\
+org.springframework.boot.actuate.autoconfigure.metrics.orm.jpa.HibernateMetricsAutoConfiguration,\
 org.springframework.boot.actuate.autoconfigure.metrics.web.client.RestTemplateMetricsAutoConfiguration,\
 org.springframework.boot.actuate.autoconfigure.metrics.web.reactive.WebFluxMetricsAutoConfiguration,\
 org.springframework.boot.actuate.autoconfigure.metrics.web.servlet.WebMvcMetricsAutoConfiguration,\

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/orm/jpa/HibernateMetricsAutoConfigurationTests.java

@@ -0,0 +1,191 @@
+/*
+ * Copyright 2012-2018 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
+ *
+ *      http://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.actuate.autoconfigure.metrics.orm.jpa;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.persistence.Entity;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.PersistenceException;
+import javax.sql.DataSource;
+
+import io.micrometer.core.instrument.MeterRegistry;
+import io.micrometer.core.instrument.simple.SimpleMeterRegistry;
+import org.hibernate.SessionFactory;
+import org.junit.Test;
+import org.mockito.ArgumentMatchers;
+
+import org.springframework.boot.actuate.autoconfigure.metrics.test.MetricsRun;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
+import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
+import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+
+/**
+ * Tests for {@link HibernateMetricsAutoConfiguration}.
+ *
+ * @author Rui Figueira
+ */
+public class HibernateMetricsAutoConfigurationTests {
+
+	private ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+			.with(MetricsRun.simple())
+			.withConfiguration(AutoConfigurations.of(DataSourceAutoConfiguration.class,
+					HibernateJpaAutoConfiguration.class,
+					HibernateMetricsAutoConfiguration.class))
+			.withUserConfiguration(BaseConfiguration.class).withPropertyValues(
+					"spring.jpa.properties.hibernate.generate_statistics:true");
+
+	@Test
+	public void autoConfiguredEntityManagerFactoryWithStatsIsInstrumented() {
+		this.contextRunner.run((context) -> {
+			context.getBean(EntityManagerFactory.class).unwrap(SessionFactory.class);
+			MeterRegistry registry = context.getBean(MeterRegistry.class);
+			registry.get("hibernate.statements")
+					.tags("entityManagerFactory", "entityManagerFactory").meter();
+		});
+	}
+
+	@Test
+	public void autoConfiguredEntityManagerFactoryWithoutStatsIsNotInstrumented() {
+		this.contextRunner
+				.withPropertyValues(
+						"spring.jpa.properties.hibernate.generate_statistics:false")
+				.run((context) -> {
+					context.getBean(EntityManagerFactory.class)
+							.unwrap(SessionFactory.class);
+					MeterRegistry registry = context.getBean(MeterRegistry.class);
+					assertThat(registry.find("hibernate.statements").meter()).isNull();
+				});
+	}
+
+	@Test
+	public void entityManagerFactoryInstrumentationCanBeDisabled() {
+		this.contextRunner.withPropertyValues("management.metrics.enable.hibernate=false")
+				.run((context) -> {
+					context.getBean(EntityManagerFactory.class)
+							.unwrap(SessionFactory.class);
+					MeterRegistry registry = context.getBean(MeterRegistry.class);
+					assertThat(registry.find("hibernate.statements").meter()).isNull();
+				});
+	}
+
+	@Test
+	public void allEntityManagerFactoriesCanBeInstrumented() {
+		this.contextRunner
+				.withUserConfiguration(TwoEntityManagerFactoriesConfiguration.class)
+				.run((context) -> {
+					context.getBean("firstEntityManagerFactory",
+							EntityManagerFactory.class).unwrap(SessionFactory.class);
+					context.getBean("secondOne", EntityManagerFactory.class)
+							.unwrap(SessionFactory.class);
+					MeterRegistry registry = context.getBean(MeterRegistry.class);
+					registry.get("hibernate.statements")
+							.tags("entityManagerFactory", "first").meter();
+					registry.get("hibernate.statements")
+							.tags("entityManagerFactory", "secondOne").meter();
+				});
+	}
+
+	@Test
+	public void entityManagerFactoryInstrumentationIsDisabledIfNotHibernateSessionFactory() {
+		this.contextRunner
+				.withUserConfiguration(
+						NonHibernateEntityManagerFactoryConfiguration.class)
+				.run((context) -> {
+					// ensure EntityManagerFactory is not an Hibernate SessionFactory
+					assertThatThrownBy(() -> context.getBean(EntityManagerFactory.class)
+							.unwrap(SessionFactory.class))
+									.isInstanceOf(PersistenceException.class);
+					MeterRegistry registry = context.getBean(MeterRegistry.class);
+					assertThat(registry.find("hibernate.statements").meter()).isNull();
+				});
+	}
+
+	@Configuration
+	static class BaseConfiguration {
+
+		@Bean
+		public SimpleMeterRegistry simpleMeterRegistry() {
+			return new SimpleMeterRegistry();
+		}
+
+	}
+
+	@Entity
+	static class MyEntity {
+
+		@Id
+		@GeneratedValue
+		private Long id;
+	}
+
+	@Configuration
+	static class TwoEntityManagerFactoriesConfiguration {
+
+		private static final Class<?>[] PACKAGE_CLASSES = new Class<?>[] {
+				MyEntity.class };
+
+		@Primary
+		@Bean
+		public LocalContainerEntityManagerFactoryBean firstEntityManagerFactory(
+				DataSource ds) {
+			return createSessionFactory(ds);
+		}
+
+		@Bean
+		public LocalContainerEntityManagerFactoryBean secondOne(DataSource ds) {
+			return createSessionFactory(ds);
+		}
+
+		private LocalContainerEntityManagerFactoryBean createSessionFactory(
+				DataSource ds) {
+			Map<String, String> jpaProperties = new HashMap<>();
+			jpaProperties.put("hibernate.generate_statistics", "true");
+			EntityManagerFactoryBuilder builder = new EntityManagerFactoryBuilder(
+					new HibernateJpaVendorAdapter(), jpaProperties, null);
+			return builder.dataSource(ds).packages(PACKAGE_CLASSES).build();
+		}
+	}
+
+	@Configuration
+	static class NonHibernateEntityManagerFactoryConfiguration {
+
+		@Bean
+		public EntityManagerFactory entityManagerFactory() {
+			EntityManagerFactory mockedFactory = mock(EntityManagerFactory.class);
+			// enforces JPA contract
+			given(mockedFactory.unwrap(ArgumentMatchers.<Class<SessionFactory>>any()))
+					.willThrow(PersistenceException.class);
+			return mockedFactory;
+		}
+	}
+}

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

@@ -38,6 +38,7 @@ import org.springframework.boot.actuate.autoconfigure.metrics.MetricsAutoConfigu
 import org.springframework.boot.actuate.autoconfigure.metrics.amqp.RabbitMetricsAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.metrics.cache.CacheMetricsAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.metrics.jdbc.DataSourcePoolMetricsAutoConfiguration;
+import org.springframework.boot.actuate.autoconfigure.metrics.orm.jpa.HibernateMetricsAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.metrics.web.client.RestTemplateMetricsAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.metrics.web.reactive.WebFluxMetricsAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.metrics.web.servlet.WebMvcMetricsAutoConfiguration;
@@ -143,6 +144,7 @@ public class MetricsIntegrationTests {
 	@ImportAutoConfiguration({ MetricsAutoConfiguration.class,
 			RabbitMetricsAutoConfiguration.class, CacheMetricsAutoConfiguration.class,
 			DataSourcePoolMetricsAutoConfiguration.class,
+			HibernateMetricsAutoConfiguration.class,
 			RestTemplateMetricsAutoConfiguration.class,
 			WebFluxMetricsAutoConfiguration.class, WebMvcMetricsAutoConfiguration.class,
 			JacksonAutoConfiguration.class, HttpMessageConvertersAutoConfiguration.class,

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

@@ -37,6 +37,7 @@ import org.springframework.boot.actuate.autoconfigure.metrics.export.signalfx.Si
 import org.springframework.boot.actuate.autoconfigure.metrics.export.simple.SimpleMetricsExportAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.metrics.export.statsd.StatsdMetricsExportAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.metrics.jdbc.DataSourcePoolMetricsAutoConfiguration;
+import org.springframework.boot.actuate.autoconfigure.metrics.orm.jpa.HibernateMetricsAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.metrics.web.client.RestTemplateMetricsAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.metrics.web.reactive.WebFluxMetricsAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.metrics.web.servlet.WebMvcMetricsAutoConfiguration;
@@ -75,6 +76,7 @@ public final class MetricsRun {
 			MetricsAutoConfiguration.class, CompositeMeterRegistryAutoConfiguration.class,
 			RabbitMetricsAutoConfiguration.class, CacheMetricsAutoConfiguration.class,
 			DataSourcePoolMetricsAutoConfiguration.class,
+			HibernateMetricsAutoConfiguration.class,
 			RestTemplateMetricsAutoConfiguration.class,
 			WebFluxMetricsAutoConfiguration.class, WebMvcMetricsAutoConfiguration.class);
 

spring-boot-project/spring-boot-docs/src/main/asciidoc/production-ready-features.adoc

@@ -1774,6 +1774,25 @@ Auto-configuration will enable the instrumentation of all available RabbitMQ con
 factories with a metric named `rabbitmq`.
 
 
+[[production-ready-metrics-hibernate]]
+==== Hibernate Metrics
+Auto-configuration enables the instrumentation of all available Hibernate
+`EntityManagerFactory` objects that have statistics enabled with a metric named
+`hibernate`.
+
+Metrics are also tagged by the name of the `EntityManagerFactory` that is derived from 
+the bean name.
+
+To enable statistics on Hibernate `EntityManagerFactory` instances, JPA property `hibernate.generate_statistics` must be set to `true`. For example, on the default
+`EntityManagerFactory`, you need to set the following property:
+
+.application.properties
+[source,properties,indent=0]
+----
+  spring.jpa.properties.hibernate.generate_statistics=true
+----
+
+
 
 [[production-ready-metrics-custom]]
 === Registering custom metrics