DATAJDBC-204 - Support for annotation based auditing.

When enabled by using @EnableJdbcAuditing entities will get properties annotated with

* @createdby
* @CreatedDate
* @LastModifiedBy
* @LastModifiedDate

updated when saved.

Original pull request: #64.

Author: kazuki43zoo

src/main/java/org/springframework/data/jdbc/domain/support/JdbcAuditingEventListener.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright 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.data.jdbc.domain.support;
+
+import org.springframework.beans.factory.ObjectFactory;
+import org.springframework.context.ApplicationListener;
+import org.springframework.data.auditing.AuditingHandler;
+import org.springframework.data.jdbc.mapping.event.BeforeSaveEvent;
+import org.springframework.lang.Nullable;
+import org.springframework.util.Assert;
+
+/**
+ * Spring JDBC event listener to capture auditing information on persisting and updating entities.
+ * <p>
+ * You can enable this class just a matter of activating auditing using {@link org.springframework.data.jdbc.repository.config.EnableJdbcAuditing} in your Spring config:
+ *
+ * <pre>
+ * &#064;Configuration
+ * &#064;EnableJdbcRepositories
+ * &#064;EnableJdbcAuditing
+ * class JdbcRepositoryConfig {
+ * }
+ * </pre>
+ *
+ * @author Kazuki Shimizu
+ * @see org.springframework.data.jdbc.repository.config.EnableJdbcAuditing
+ * @since 1.0
+ */
+public class JdbcAuditingEventListener implements ApplicationListener<BeforeSaveEvent> {
+
+	@Nullable
+	private AuditingHandler handler;
+
+	/**
+	 * Configures the {@link AuditingHandler} to be used to set the current auditor on the domain types touched.
+	 *
+	 * @param auditingHandler must not be {@literal null}.
+	 */
+	public void setAuditingHandler(ObjectFactory<AuditingHandler> auditingHandler) {
+		Assert.notNull(auditingHandler, "AuditingHandler must not be null!");
+		this.handler = auditingHandler.getObject();
+	}
+
+	/**
+	 * {@inheritDoc}
+	 * @param event a notification event for indicating before save
+	 */
+	@Override
+	public void onApplicationEvent(BeforeSaveEvent event) {
+		if (handler != null) {
+			event.getOptionalEntity().ifPresent(entity -> {
+				if (event.getId().getOptionalValue().isPresent()) {
+					handler.markModified(entity);
+				} else {
+					handler.markCreated(entity);
+				}
+			});
+		}
+	}
+
+}

src/main/java/org/springframework/data/jdbc/repository/config/EnableJdbcAuditing.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright 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.data.jdbc.repository.config;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Inherited;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.context.annotation.Import;
+import org.springframework.data.auditing.DateTimeProvider;
+import org.springframework.data.domain.AuditorAware;
+
+/**
+ * Annotation to enable auditing in JDBC via annotation configuration.
+ *
+ * If you use the auditing feature, you should be configures beans of Spring Data JDBC
+ * using {@link org.springframework.data.jdbc.repository.config.EnableJdbcRepositories} in your Spring config:
+ *
+ * <pre>
+ * &#064;Configuration
+ * &#064;EnableJdbcRepositories
+ * &#064;EnableJdbcAuditing
+ * class JdbcRepositoryConfig {
+ * }
+ * </pre>
+ *
+ * <p>
+ * Note: This feature cannot use to a entity that implements {@link org.springframework.data.domain.Auditable}
+ * because the Spring Data JDBC does not support an {@link java.util.Optional} property yet.
+ * </p>
+ *
+ * @see EnableJdbcRepositories
+ * @author Kazuki Shimizu
+ * @since 1.0
+ */
+@Inherited
+@Documented
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+@Import(JdbcAuditingRegistrar.class)
+public @interface EnableJdbcAuditing {
+
+	/**
+	 * Configures the {@link AuditorAware} bean to be used to lookup the current principal.
+	 *
+	 * @return
+	 * @see AuditorAware
+	 */
+	String auditorAwareRef() default "";
+
+	/**
+	 * Configures whether the creation and modification dates are set.
+	 *
+	 * @return
+	 */
+	boolean setDates() default true;
+
+	/**
+	 * Configures whether the entity shall be marked as modified on creation.
+	 *
+	 * @return
+	 */
+	boolean modifyOnCreate() default true;
+
+	/**
+	 * Configures a {@link DateTimeProvider} bean name that allows customizing the {@link java.time.LocalDateTime} to be
+	 * used for setting creation and modification dates.
+	 *
+	 * @return
+	 * @see DateTimeProvider
+	 */
+	String dateTimeProviderRef() default "";
+
+}

src/main/java/org/springframework/data/jdbc/repository/config/JdbcAuditingRegistrar.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright 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.data.jdbc.repository.config;
+
+import java.lang.annotation.Annotation;
+
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.beans.factory.support.BeanDefinitionBuilder;
+import org.springframework.beans.factory.support.BeanDefinitionRegistry;
+import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
+import org.springframework.data.auditing.config.AuditingBeanDefinitionRegistrarSupport;
+import org.springframework.data.auditing.config.AuditingConfiguration;
+import org.springframework.data.config.ParsingUtils;
+import org.springframework.data.jdbc.domain.support.JdbcAuditingEventListener;
+
+/**
+ * {@link ImportBeanDefinitionRegistrar} to enable {@link EnableJdbcAuditing} annotation.
+ *
+ * @see EnableJdbcAuditing
+ * @author Kazuki Shimizu
+ * @since 1.0
+ */
+class JdbcAuditingRegistrar extends AuditingBeanDefinitionRegistrarSupport {
+
+	/**
+	 * {@inheritDoc}
+	 * @return return the {@link EnableJdbcAuditing}
+	 * @see org.springframework.data.auditing.config.AuditingBeanDefinitionRegistrarSupport#getAnnotation()
+	 */
+	@Override
+	protected Class<? extends Annotation> getAnnotation() {
+		return EnableJdbcAuditing.class;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 * @return return "{@literal jdbcAuditingHandler}"
+	 * @see org.springframework.data.auditing.config.AuditingBeanDefinitionRegistrarSupport#getAuditingHandlerBeanName()
+	 */
+	@Override
+	protected String getAuditingHandlerBeanName() {
+		return "jdbcAuditingHandler";
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.data.auditing.config.AuditingBeanDefinitionRegistrarSupport#getAuditHandlerBeanDefinitionBuilder(org.springframework.data.auditing.config.AuditingConfiguration)
+	 */
+	@Override
+	protected BeanDefinitionBuilder getAuditHandlerBeanDefinitionBuilder(AuditingConfiguration configuration) {
+		BeanDefinitionBuilder builder = super.getAuditHandlerBeanDefinitionBuilder(configuration);
+		return builder.addConstructorArgReference("jdbcMappingContext");
+	}
+
+	/**
+	 * Register the bean definition of {@link JdbcAuditingEventListener}.
+	 * {@inheritDoc}
+	 * @see org.springframework.data.auditing.config.AuditingBeanDefinitionRegistrarSupport#registerAuditListenerBeanDefinition(BeanDefinition, BeanDefinitionRegistry)
+	 */
+	@Override
+	protected void registerAuditListenerBeanDefinition(BeanDefinition auditingHandlerDefinition,
+													   BeanDefinitionRegistry registry) {
+		Class<?> listenerClass = JdbcAuditingEventListener.class;
+		BeanDefinitionBuilder builder = BeanDefinitionBuilder.rootBeanDefinition(listenerClass);
+		builder.addPropertyValue("auditingHandler",
+			ParsingUtils.getObjectFactoryBeanDefinition(getAuditingHandlerBeanName(), null));
+		registerInfrastructureBeanWithId(builder.getRawBeanDefinition(), listenerClass.getName(), registry);
+	}
+
+}