MyBaits自动配置原理
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2021-05-28 11:00
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作者 | 歪头儿在帝都
来源 | urlify.cn/j2MfQj
前言
首先我们建立一个SpringBoot工程，导入mybatis-spring-boot-starter依赖。
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.4</version>
</dependency>
导入后发现这个依赖其实就是帮助我们导入了mybatis需要的依赖，其中和自动配置相关最重要的一个就是mybatis-spring-boot-autoconfigure
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-autoconfigure</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
</dependency>
</dependencies>
MyBatis自动配置中是如何工作的
如上面分析自动配置的关键类我们就从mybatis-spring-boot-autoconfigure开始着手分析。
spring.factories
# Auto Configure
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
org.mybatis.spring.boot.autoconfigure.MybatisLanguageDriverAutoConfiguration,\
org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration
从spring.factories文件看到这里通过SPI机制加载了两个类
MybatisAutoConfiguration
MybatisLanguateDriverAutoConfiguration.
MybatisAutoConfiguration
//表示这是一个Spring配置类
@Configuration
//这个类需要在classpath中存在SqlSessionFactory和SqlSessionFactoryBean时才生效
@ConditionalOnClass({SqlSessionFactory.class, SqlSessionFactoryBean.class}) --
//这个类需要有一个DataSource的Canidate注册到Spring容器中
@ConditionalOnSingleCandidate(DataSource.class)
//使MybatisProperties注解类生效
@EnableConfigurationProperties({MybatisProperties.class})
//需要在DataSourceAutoConfiguration和MybatisLanguageDriverAutoConfiguration自动配置之后执行
@AutoConfigureAfter({DataSourceAutoConfiguration.class, MybatisLanguageDriverAutoConfiguration.class})
public class MybatisAutoConfiguration implements InitializingBean {
}
MybatisAutoConfiguration#sqlSessionFactory
@Bean
@ConditionalOnMissingBean
public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception {
//创建一个SqlSessionFactoryBean, 在mybatis-spring项目下
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()));
}
//应用Configuration对象
this.applyConfiguration(factory);
if (this.properties.getConfigurationProperties() != null) {
factory.setConfigurationProperties(this.properties.getConfigurationProperties());
}
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 (this.properties.getTypeAliasesSuperType() != null) {
factory.setTypeAliasesSuperType(this.properties.getTypeAliasesSuperType());
}
if (StringUtils.hasLength(this.properties.getTypeHandlersPackage())) {
factory.setTypeHandlersPackage(this.properties.getTypeHandlersPackage());
}
if (!ObjectUtils.isEmpty(this.typeHandlers)) {
factory.setTypeHandlers(this.typeHandlers);
}
if (!ObjectUtils.isEmpty(this.properties.resolveMapperLocations())) {
factory.setMapperLocations(this.properties.resolveMapperLocations());
}
Set<String> factoryPropertyNames = (Set)Stream.of((new BeanWrapperImpl(SqlSessionFactoryBean.class)).getPropertyDescriptors()).map(FeatureDescriptor::getName).collect(Collectors.toSet());
Class<? extends LanguageDriver> defaultLanguageDriver = this.properties.getDefaultScriptingLanguageDriver();
if (factoryPropertyNames.contains("scriptingLanguageDrivers") && !ObjectUtils.isEmpty(this.languageDrivers)) {
factory.setScriptingLanguageDrivers(this.languageDrivers);
if (defaultLanguageDriver == null && this.languageDrivers.length == 1) {
defaultLanguageDriver = this.languageDrivers[0].getClass();
}
}
//设置默认的语言驱动类
if (factoryPropertyNames.contains("defaultScriptingLanguageDriver")) {
factory.setDefaultScriptingLanguageDriver(defaultLanguageDriver);
}
//这里默认会返回一个DefaultSqlSessionFactory对象
return factory.getObject();
}
MybatisAutoConfiguration#sqlSessionTemplate
@Bean
@ConditionalOnMissingBean
public SqlSessionTemplate sqlSessionTemplate(SqlSessionFactory sqlSessionFactory) {
ExecutorType executorType = this.properties.getExecutorType();
return executorType != null ? new SqlSessionTemplate(sqlSessionFactory, executorType) : new SqlSessionTemplate(sqlSessionFactory);
}
到这里也就知道了MyBatis自动配置其实就是替我们完成了SqlSessionFactory和SqlSessionTempate的创建, 省去了自己导入相关依赖和配置相关Bean的麻烦.
MybatisLanguageDriverAutoConfiguration
这个类的配置是对各个语言的支持，比如Thymeleaf， Velocity，LegacyVelociy， FreeMarker等视图组件的支持。
@Configuration
@ConditionalOnClass({LanguageDriver.class})
public class MybatisLanguageDriverAutoConfiguration {
private static final String CONFIGURATION_PROPERTY_PREFIX = "mybatis.scripting-language-driver";
public MybatisLanguageDriverAutoConfiguration() {
}
@Configuration
@ConditionalOnClass({ThymeleafLanguageDriver.class})
public static class ThymeleafConfiguration {
public ThymeleafConfiguration() {
}
}
@Configuration
@ConditionalOnClass({VelocityLanguageDriver.class, VelocityLanguageDriverConfig.class})
public static class VelocityConfiguration {
public VelocityConfiguration() {
}
}
@Configuration
@ConditionalOnClass({Driver.class})
@ConditionalOnMissingClass({"org.mybatis.scripting.velocity.VelocityLanguageDriverConfig"})
public static class LegacyVelocityConfiguration {
public LegacyVelocityConfiguration() {
}
}
@Configuration
@ConditionalOnClass({FreeMarkerLanguageDriver.class, FreeMarkerLanguageDriverConfig.class})
public static class FreeMarkerConfiguration {
public FreeMarkerConfiguration() {
}
}
@Configuration
@ConditionalOnClass({FreeMarkerLanguageDriver.class})
@ConditionalOnMissingClass({"org.mybatis.scripting.freemarker.FreeMarkerLanguageDriverConfig"})
public static class LegacyFreeMarkerConfiguration {
public LegacyFreeMarkerConfiguration() {
}
}
}
MybatisLanguageDriverAutoConfiguration类在org.mybatis.spring.boot.autoconfigure包下，我删掉了内部静态类下的代码，为了保持这个类看起来更直观
自定义Mapper是如何被扫描的
业务开发中，我们是声明接口（Mapper），那么我们自定义的Mapper是如何被扫描的呢, 我们继续顺着MybatisAutoConfiguration代码分析,其内部包含了一个AutoConfiguredMapperScannerRegistrar的内部静态类.
AutoConfiguredMapperScannerRegistrar
registerBeanDefinitions
public static class AutoConfiguredMapperScannerRegistrar
implements BeanFactoryAware, ImportBeanDefinitionRegistrar {
private BeanFactory beanFactory;
public AutoConfiguredMapperScannerRegistrar() {
}
public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
if (!AutoConfigurationPackages.has(this.beanFactory)) {
} else {
//1.获取到SpringBoot的基础包路径
List<String> packages = AutoConfigurationPackages.get(this.beanFactory);
//2.生成一个BeanDefinition的构造器，用于构建MapperScannerConfigurer的 //BeanDefinition
BeanDefinitionBuilder builder = BeanDefinitionBuilder.genericBeanDefinition(MapperScannerConfigurer.class);
builder.addPropertyValue("processPropertyPlaceHolders", true);
//3.设置@Mapper注解的接口才会被当成Mapper接口
builder.addPropertyValue("annotationClass", Mapper.class);
builder.addPropertyValue("basePackage", StringUtils.collectionToCommaDelimitedString(packages));
BeanWrapper beanWrapper = new BeanWrapperImpl(MapperScannerConfigurer.class);
//4.获取MapperScannerConfigurer的属性名称
Set<String> propertyNames = (Set)Stream.of(beanWrapper.getPropertyDescriptors()).map(FeatureDescriptor::getName).collect(Collectors.toSet());
if (propertyNames.contains("lazyInitialization")) {
builder.addPropertyValue("lazyInitialization", "${mybatis.lazy-initialization:false}");
}
if (propertyNames.contains("defaultScope")) {
builder.addPropertyValue("defaultScope", "${mybatis.mapper-default-scope:}");
}
//5.这里添加一个MapperScannerConfigurer的BeanDefinition对象，也就是注入一个
//MapperScannerConfigurer对象
registry.registerBeanDefinition(MapperScannerConfigurer.class.getName(), builder.getBeanDefinition());
}
}
public void setBeanFactory(BeanFactory beanFactory) {
this.beanFactory = beanFactory;
}
}
AutoConfiguredMapperScannerRegistrar类是MybatisAutoConfiguration的内部静态类，位于包org.mybatis.spring.boot.autoconfigure下。
可以看到这个类实现了ImportBeanDefinitionRegistrar接口，ImportBeanDefinitionRegistrar接口是Spring用来动态注册Bean的，也就是会向Spring容器中注入一个BeanDefinition， 这个BeanDefinition就是MapperScannerConfigurer。
ImportBeanDefinitionRegistrar实现类只能通过其他类@Import的方式来加载，通常是配置类或者启动类，所以MybatisAutoConfiguration类下还有一个内部类MapperScannerRegistrarNotFoundConfiguration如下。
@Configuration
@Import({MybatisAutoConfiguration.AutoConfiguredMapperScannerRegistrar.class})
@ConditionalOnMissingBean({MapperFactoryBean.class, MapperScannerConfigurer.class})
public static class MapperScannerRegistrarNotFoundConfiguration implements InitializingBean {
}这个方法里最后会调用接口BeanDefinitionRegistry.registerBeanDefinition， beanName是"org.mybatis.spring.mapper.MapperScannerConfigurer", registerBeanDefinition方法实际会调用DefaultListableBeanFactory.registerBeanDefinition。DefaultListableBeanFactory是BeanDefinitionRegistry接口的实现类。
public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFactory
implements ConfigurableListableBeanFactory,
BeanDefinitionRegistry,
Serializable {
}
AutoConfiguredMapperScannerRegistrar类和MapperScanner注解的作用是一样的，如果你没有通过以下三种配置方式扫描Mapper接口的包路径
配置MapperScannerConfigurer扫描器类型的Spring Bean
@Mapper注解
<mybatis: scan/>标签
那么这里就会通过AutoConfiguredMapperScannerRegistrar类添加一个MapperScannerConfigurer扫描器对象，去扫描SpringBoot包设置的基础包路径，也就是启动类的同级目录。如果设置了@Mapper注解，则会当成Mapper接口解析，那么这里自动配置则不生效。
MapperScannerConfigurer
MapperScannerConfigurer
MapperScannerConfigurer实现了BeanDefinitionRegistryPostProcessor接口，BeanDefinitionRegistryPostProcessor 接口又继承了BeanFactoryPostProcessor接口， 也就是说在MapperScannerConfigurer类里需要实现这两个接口的方法。
public interface BeanDefinitionRegistryPostProcessor extends BeanFactoryPostProcessor {
void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry var1) throws BeansException;
}
@FunctionalInterface
public interface BeanFactoryPostProcessor {
void postProcessBeanFactory(ConfigurableListableBeanFactory var1) throws BeansException;
}
在MapperScannerConfigurer类里可以看到这里只实现了postProcessBeanDefinitionRegistry。
BeanDefinitionRegistryPostProcessor
Spring里有两个用来动态注册Bean到容器中（BeanDefinitionRegistryPostProcessor和ImportBeanDefinitionRegistrar）。ImportBeanDefinitionRegistrar上文中有提到。
BeanDefinitionRegistryPostProcessor接口实现了BeanFactoryPostProcessor接口，是Spring框架的BeanDefinitionRegistry的后置处理器，用来注册额外的BeanDefinition，postProcessBeanDefinitionRegistry方法会在所有的beanDefinition被加载了，但是所有的Bean还没创建前调用。BeanDefinitionRegistryPostProcessor经常被用来注册BeanFactoryPostProcessor的BeanDefinition。
postProcessBeanDefinitionRegistry
public class MapperScannerConfigurer implements BeanDefinitionRegistryPostProcessor, InitializingBean, ApplicationContextAware, BeanNameAware {
public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) {
if (this.processPropertyPlaceHolders) {
this.processPropertyPlaceHolders();
}
ClassPathMapperScanner scanner = new ClassPathMapperScanner(registry);
scanner.setAddToConfig(this.addToConfig);
scanner.setAnnotationClass(this.annotationClass);
scanner.setMarkerInterface(this.markerInterface);
scanner.setSqlSessionFactory(this.sqlSessionFactory);
scanner.setSqlSessionTemplate(this.sqlSessionTemplate);
scanner.setSqlSessionFactoryBeanName(this.sqlSessionFactoryBeanName);
scanner.setSqlSessionTemplateBeanName(this.sqlSessionTemplateBeanName);
scanner.setResourceLoader(this.applicationContext);
scanner.setBeanNameGenerator(this.nameGenerator);
scanner.setMapperFactoryBeanClass(this.mapperFactoryBeanClass);
if (StringUtils.hasText(this.lazyInitialization)) {
scanner.setLazyInitialization(Boolean.valueOf(this.lazyInitialization));
}
if (StringUtils.hasText(this.defaultScope)) {
scanner.setDefaultScope(this.defaultScope);
}
scanner.registerFilters();
scanner.scan(StringUtils.tokenizeToStringArray(this.basePackage, ",; \t\n"));
}
}
MapperScannerConfigurer在包org.mybatis.spring.mapper下.
这里会调用ClassPathMapperScanner.scan()，而ClassPathMapperScanner又继承了ClassPathBeanDefinitionScanner，所以这里scan()会调用ClassPathBeanDefinitionScanner.scan()， 而ClassPathBeanDefinitionScanner.scan() 第二句代码又调用了this.doScan(basePackages)， this.doScan()又调用了ClassPathMapperScanner.doScan(), 而这个方法第一句代码又调用了super.doScan(basePackages)，父子类来回互相调用，有点晕头转向的。
org.mybatis.spring.mapper.ClassPathMapperScanner
org.springframework.context.annotation.ClassPathBeanDefinitionScanner这个类在spring-context.jar
ClassPathMapperScanner
ClassPathBeanDefinitionScanner#scan
public int scan(String... basePackages) {
int beanCountAtScanStart = this.registry.getBeanDefinitionCount();
this.doScan(basePackages);
if (this.includeAnnotationConfig) {
AnnotationConfigUtils.registerAnnotationConfigProcessors(this.registry);
}
return this.registry.getBeanDefinitionCount() - beanCountAtScanStart;
}
ClassPathMapperScanner#doScan()
这个方法里在mybatis自动配置算比较重要的一个方法，也就是帮助我们自动配置MapperFactoryBean， 会把根据basePackage注册进Spring容器的BeanDefinition的beanClass设置成MapperFactoryBean。
public Set<BeanDefinitionHolder> doScan(String... basePackages) {
Set<BeanDefinitionHolder> beanDefinitions = super.doScan(basePackages);
if (beanDefinitions.isEmpty()) {
LOGGER.warn(() -> {
return "No MyBatis mapper was found in '" + Arrays.toString(basePackages) + "' package. Please check your configuration.";
});
} else {
//这是一个关键方法，会处理已经注册进Spring容器的beanDefinition，也就是会把
//已经注册进Spring容器的beanDefinitiond的beanClass为MapperFactoryBean
this.processBeanDefinitions(beanDefinitions);
}
return beanDefinitions;
}
ClassPathBeanDefinitionScanner#doScan()
protected Set<BeanDefinitionHolder> doScan(String... basePackages) {
Assert.notEmpty(basePackages, "At least one base package must be specified");
Set<BeanDefinitionHolder> beanDefinitions = new LinkedHashSet();
String[] var3 = basePackages;
int var4 = basePackages.length;
for(int var5 = 0; var5 < var4; ++var5) {
String basePackage = var3[var5];
//这个方法会扫描指定basePackage下被@Mapper注解标注的接口
Set<BeanDefinition> candidates = this.findCandidateComponents(basePackage);
Iterator var8 = candidates.iterator();
while(var8.hasNext()) {
BeanDefinition candidate = (BeanDefinition)var8.next();
ScopeMetadata scopeMetadata = this.scopeMetadataResolver.resolveScopeMetadata(candidate);
candidate.setScope(scopeMetadata.getScopeName());
//这里获取beanName, 默认值是类名首字母小写
String beanName = this.beanNameGenerator.generateBeanName(candidate, this.registry);
if (candidate instanceof AbstractBeanDefinition) {
this.postProcessBeanDefinition((AbstractBeanDefinition)candidate, beanName);
}
if (candidate instanceof AnnotatedBeanDefinition) {
AnnotationConfigUtils.processCommonDefinitionAnnotations((AnnotatedBeanDefinition)candidate);
}
//检查对应的Mapper接口是否被注册进Spring容器中。
if (this.checkCandidate(beanName, candidate)) {
BeanDefinitionHolder definitionHolder = new BeanDefinitionHolder(candidate, beanName);
definitionHolder = AnnotationConfigUtils.applyScopedProxyMode(scopeMetadata, definitionHolder, this.registry);
beanDefinitions.add(definitionHolder);
this.registerBeanDefinition(definitionHolder, this.registry);
}
}
}
//这个集合返回以后 Spring容器会将里面的所有内容注册到容器中
return beanDefinitions;
}
ClassPathMapperScanner#processBeanDefinitions
private void processBeanDefinitions(Set<BeanDefinitionHolder> beanDefinitions) {
BeanDefinitionRegistry registry = this.getRegistry();
Iterator var4 = beanDefinitions.iterator();
while(var4.hasNext()) {
BeanDefinitionHolder holder = (BeanDefinitionHolder)var4.next();
AbstractBeanDefinition definition = (AbstractBeanDefinition)holder.getBeanDefinition();
boolean scopedProxy = false;
if (ScopedProxyFactoryBean.class.getName().equals(definition.getBeanClassName())) {
definition = (AbstractBeanDefinition)Optional.ofNullable(((RootBeanDefinition)definition).getDecoratedDefinition()).map(BeanDefinitionHolder::getBeanDefinition).orElseThrow(() -> {
return new IllegalStateException("The target bean definition of scoped proxy bean not found. Root bean definition[" + holder + "]");
});
scopedProxy = true;
}
String beanClassName = definition.getBeanClassName();
LOGGER.debug(() -> {
return "Creating MapperFactoryBean with name '" + holder.getBeanName() + "' and '" + beanClassName + "' mapperInterface";
});
definition.getConstructorArgumentValues().addGenericArgumentValue(beanClassName);
//1.这里把普通接口设置成MapperFactoryBean
definition.setBeanClass(this.mapperFactoryBeanClass);
//2.是否把Mapper接口加入到Mybatis的Config当中去， 这里设置为true
definition.getPropertyValues().add("addToConfig", this.addToConfig);
definition.setAttribute("factoryBeanObjectType", beanClassName);
boolean explicitFactoryUsed = false;
//2.从核心容器里获取SqlSessionFactory赋值给MapperFactoryBean
if (StringUtils.hasText(this.sqlSessionFactoryBeanName)) {
definition.getPropertyValues().add("sqlSessionFactory", new RuntimeBeanReference(this.sqlSessionFactoryBeanName));
explicitFactoryUsed = true;
} else if (this.sqlSessionFactory != null) {
definition.getPropertyValues().add("sqlSessionFactory", this.sqlSessionFactory);
explicitFactoryUsed = true;
}
//3.从核心容器里获取SqlSessionTemplate赋值给MapperFactoryBean
if (StringUtils.hasText(this.sqlSessionTemplateBeanName)) {
if (explicitFactoryUsed) {
LOGGER.warn(() -> {
return "Cannot use both: sqlSessionTemplate and sqlSessionFactory together. sqlSessionFactory is ignored.";
});
}
definition.getPropertyValues().add("sqlSessionTemplate", new RuntimeBeanReference(this.sqlSessionTemplateBeanName));
explicitFactoryUsed = true;
} else if (this.sqlSessionTemplate != null) {
if (explicitFactoryUsed) {
LOGGER.warn(() -> {
return "Cannot use both: sqlSessionTemplate and sqlSessionFactory together. sqlSessionFactory is ignored.";
});
}
definition.getPropertyValues().add("sqlSessionTemplate", this.sqlSessionTemplate);
explicitFactoryUsed = true;
}
if (!explicitFactoryUsed) {
LOGGER.debug(() -> {
return "Enabling autowire by type for MapperFactoryBean with name '" + holder.getBeanName() + "'.";
});
definition.setAutowireMode(2);
}
definition.setLazyInit(this.lazyInitialization);
if (!scopedProxy) {
if ("singleton".equals(definition.getScope()) && this.defaultScope != null) {
definition.setScope(this.defaultScope);
}
if (!definition.isSingleton()) {
BeanDefinitionHolder proxyHolder = ScopedProxyUtils.createScopedProxy(holder, registry, true);
if (registry.containsBeanDefinition(proxyHolder.getBeanName())) {
registry.removeBeanDefinition(proxyHolder.getBeanName());
}
registry.registerBeanDefinition(proxyHolder.getBeanName(), proxyHolder.getBeanDefinition());
}
}
}
}
再看spring.factories文件
上面只是完成了MyBatis 自动配置的工作，那么这些自动配置是如何在SpringBoot启动时执行呢？还记得SpringBoot的EnableAutoConfiguration注解吧，它是利用SpringFactoriesLoader机制加载所有的AutoConfiguration类，所以我们需要把编写好的自动配置类放在META-INF/spring.factories文件中，这也就是我们一开始分析的mybatis-spring-boot-starter-autoconfigure的文件结构的原因。
# Auto Configure
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
org.mybatis.spring.boot.autoconfigure.MybatisLanguageDriverAutoConfiguration,\
org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration
总结
mybatis-spring-boot-starter将mybatis需要的依赖全部引入。
starter通过SPI机制引入了一个配置的Class（MyBatisAutoConfiguration）。它负责注册SqlSessionFactory和SqlSessionTemplate到Spring容器中，使用MyBatis开发时绝大部分功能要使用这两个类来完成。
注入了AutoConfiguredMapperScannerRegistrar这个Bean到Spring容器，它负责将MapperScanner引入到Spring容器，然后MapperScanner会将工程中指定package下的Mapper转化为BeanDefinition并且注册到Spring容器中。
在开发中使用某个具体的Mapper时，Spring能够从容器中找到这个Mapper对应的BeanDefinition，将其实例化并且注入，这样开发者就可以使用了。
SpringBoot+MyBatis自动配置涉及到Spring中两个自动注册Bean的关键接口（BeanDefinitionRegistryPostProcessor和ImportBeanDefinitionRegistrar），也是我们业务开发中需要重点关注的地方。
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