Java tutorial
/** * Copyright 2015-2016 the original author or authors. * <p> * 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 * <p> * http://www.apache.org/licenses/LICENSE-2.0 * <p> * 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 com.github.mybatis.repository.autoconfig; import org.apache.ibatis.annotations.Mapper; import org.apache.ibatis.mapping.DatabaseIdProvider; import org.apache.ibatis.plugin.Interceptor; import org.apache.ibatis.session.ExecutorType; import org.apache.ibatis.session.SqlSessionFactory; import org.mybatis.spring.SqlSessionFactoryBean; import org.mybatis.spring.SqlSessionTemplate; import org.mybatis.spring.mapper.ClassPathMapperScanner; import org.mybatis.spring.mapper.MapperFactoryBean; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.BeansException; import org.springframework.beans.factory.BeanFactory; import org.springframework.beans.factory.BeanFactoryAware; import org.springframework.beans.factory.ObjectProvider; import org.springframework.beans.factory.support.BeanDefinitionRegistry; import org.springframework.boot.autoconfigure.AutoConfigurationPackages; import org.springframework.boot.autoconfigure.AutoConfigureAfter; import org.springframework.boot.autoconfigure.EnableAutoConfiguration; import org.springframework.boot.autoconfigure.condition.ConditionalOnBean; import org.springframework.boot.autoconfigure.condition.ConditionalOnClass; import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean; import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration; import org.springframework.boot.context.properties.EnableConfigurationProperties; import org.springframework.context.ResourceLoaderAware; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Import; import org.springframework.context.annotation.ImportBeanDefinitionRegistrar; import org.springframework.core.io.Resource; import org.springframework.core.io.ResourceLoader; import org.springframework.core.type.AnnotationMetadata; import org.springframework.util.Assert; import org.springframework.util.ObjectUtils; import org.springframework.util.StringUtils; import javax.annotation.PostConstruct; import javax.sql.DataSource; import java.util.List; /** * {@link EnableAutoConfiguration Auto-Configuration} for Mybatis. Contributes a * {@link SqlSessionFactory} and a {@link SqlSessionTemplate}. * <p> * If {@link org.mybatis.spring.annotation.MapperScan} is used, or a * configuration file is specified as a property, those will be considered, * otherwise this auto-configuration will attempt to register mappers based on * the interface definitions in or under the root auto-configuration package. * * @author Edd Melndez * @author Josh Long * @author Kazuki Shimizu * @author Eduardo Macarrn */ @Configuration @ConditionalOnClass({ SqlSessionFactory.class, SqlSessionFactoryBean.class }) //@ConditionalOnBean(DataSource.class) @EnableConfigurationProperties(MybatisProperties.class) @AutoConfigureAfter(DataSourceAutoConfiguration.class) public class MybatisAutoConfiguration { private static Logger logger = LoggerFactory.getLogger(MybatisAutoConfiguration.class); private MybatisProperties properties; private Interceptor[] interceptors; private ResourceLoader resourceLoader; private DatabaseIdProvider databaseIdProvider; public MybatisAutoConfiguration(MybatisProperties properties, ObjectProvider<Interceptor[]> interceptorsProvider, ResourceLoader resourceLoader, ObjectProvider<DatabaseIdProvider> databaseIdProvider) { this.properties = properties; this.interceptors = interceptorsProvider.getIfAvailable(); this.resourceLoader = resourceLoader; this.databaseIdProvider = databaseIdProvider.getIfAvailable(); } @PostConstruct public void checkConfigFileExists() { if (this.properties.isCheckConfigLocation() && StringUtils.hasText(this.properties.getConfigLocation())) { Resource resource = this.resourceLoader.getResource(this.properties.getConfigLocation()); Assert.state(resource.exists(), "Cannot find config location: " + resource + " (please add config file or check your Mybatis configuration)"); } } @Bean @ConditionalOnMissingBean public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception { SqlSessionFactoryBean factory = new SqlSessionFactoryBean(); factory.setDataSource(dataSource); factory.setVfs(SpringBootVFS.class); if (StringUtils.hasText(this.properties.getConfigLocation())) { factory.setConfigLocation(this.resourceLoader.getResource(this.properties.getConfigLocation())); } factory.setConfiguration(properties.getConfiguration()); if (!ObjectUtils.isEmpty(this.interceptors)) { factory.setPlugins(this.interceptors); } if (this.databaseIdProvider != null) { factory.setDatabaseIdProvider(this.databaseIdProvider); } if (StringUtils.hasLength(this.properties.getTypeAliasesPackage())) { factory.setTypeAliasesPackage(this.properties.getTypeAliasesPackage()); } if (StringUtils.hasLength(this.properties.getTypeHandlersPackage())) { factory.setTypeHandlersPackage(this.properties.getTypeHandlersPackage()); } if (!ObjectUtils.isEmpty(this.properties.resolveMapperLocations())) { factory.setMapperLocations(this.properties.resolveMapperLocations()); } return factory.getObject(); } @Bean @ConditionalOnMissingBean public SqlSessionTemplate sqlSessionTemplate(SqlSessionFactory sqlSessionFactory) { ExecutorType executorType = this.properties.getExecutorType(); if (executorType != null) { return new SqlSessionTemplate(sqlSessionFactory, executorType); } else { return new SqlSessionTemplate(sqlSessionFactory); } } /** * This will just scan the same base package as Spring Boot does. If you want * more power, you can explicitly use * {@link org.mybatis.spring.annotation.MapperScan} but this will get typed * mappers working correctly, out-of-the-box, similar to using Spring Data JPA * repositories. */ public static class AutoConfiguredMapperScannerRegistrar implements BeanFactoryAware, ImportBeanDefinitionRegistrar, ResourceLoaderAware { private BeanFactory beanFactory; private ResourceLoader resourceLoader; @Override public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) { logger.debug("Searching for mappers annotated with @Mapper'"); ClassPathMapperScanner scanner = new ClassPathMapperScanner(registry); try { if (this.resourceLoader != null) { scanner.setResourceLoader(this.resourceLoader); } List<String> packages = AutoConfigurationPackages.get(this.beanFactory); if (logger.isDebugEnabled()) { for (String pkg : packages) { logger.debug("Using auto-configuration base package '{}'", pkg); } } scanner.setAnnotationClass(Mapper.class); scanner.registerFilters(); scanner.doScan(StringUtils.toStringArray(packages)); } catch (IllegalStateException ex) { logger.debug("Could not determine auto-configuration package, automatic mapper scanning disabled."); } } @Override public void setBeanFactory(BeanFactory beanFactory) throws BeansException { this.beanFactory = beanFactory; } @Override public void setResourceLoader(ResourceLoader resourceLoader) { this.resourceLoader = resourceLoader; } } /** * {@link org.mybatis.spring.annotation.MapperScan} ultimately ends up * creating instances of {@link MapperFactoryBean}. If * {@link org.mybatis.spring.annotation.MapperScan} is used then this * auto-configuration is not needed. If it is _not_ used, however, then this * will bring in a bean registrar and automatically register components based * on the same component-scanning path as Spring Boot itself. */ @Configuration @Import({ AutoConfiguredMapperScannerRegistrar.class }) @ConditionalOnMissingBean(MapperFactoryBean.class) public static class MapperScannerRegistrarNotFoundConfiguration { @PostConstruct public void afterPropertiesSet() { logger.debug("No {} found.", MapperFactoryBean.class.getName()); } } }