标签：log override void use erp ring conf ali run
接上一节，BeanDefiniton设置
//1、BeanDefiniton将自己的构造器设置为自己的className
definition.getConstructorArgumentValues().addGenericArgumentValue(definition.getBeanClassName());
//2、BeanDefiniton将自己的BeanClass设置为：MapperFactoryBean.class
definition.setBeanClass(this.mapperFactoryBean.getClass());
//3、BeanDefiniton设置属性sqlSessionFactory
definition.getPropertyValues().add("sqlSessionFactory", new RuntimeBeanReference(this.sqlSessionFactoryBeanName));
实例化Bean
1、调用构造方法实例化MapperFactoryBean
public MapperFactoryBean(Class<T> mapperInterface) {
this.mapperInterface = mapperInterface;
}
2、设置属性，MapperFactoryBean的父类SqlSessionDaoSupport.setSqlSessionFactory方法
public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {
if (!this.externalSqlSession) {
this.sqlSession = new SqlSessionTemplate(sqlSessionFactory);
}
}
2、调用afterPropertiesSet
@Override
public final void afterPropertiesSet() throws IllegalArgumentException, BeanInitializationException {
// Let abstract subclasses check their configuration.
checkDaoConfig();
// Let concrete implementations initialize themselves.
try {
initDao();
}
catch (Exception ex) {
throw new BeanInitializationException("Initialization of DAO failed", ex);
}
}
调用 checkDaoConfig，将mapperInterface放入configuration中，
configuration.addMapper(this.mapperInterface) 会解析 mapperInterface （mapperInterface）对应的XML和注解。
protected void checkDaoConfig() {
super.checkDaoConfig();
notNull(this.mapperInterface, "Property ‘mapperInterface‘ is required");
Configuration configuration = getSqlSession().getConfiguration();
if (this.addToConfig && !configuration.hasMapper(this.mapperInterface)) {
try {
configuration.addMapper(this.mapperInterface);
} catch (Exception e) {
logger.error("Error while adding the mapper ‘" + this.mapperInterface + "‘ to configuration.", e);
throw new IllegalArgumentException(e);
} finally {
ErrorContext.instance().reset();
}
}
}
因为是FactoryBean，用到的是FactoryBean.getObject()返回的数据。
public T getObject() throws Exception {
return getSqlSession().getMapper(this.mapperInterface);
}
最终返回的是一个代理对象：mapperProxyFactory.newInstance(sqlSession);
public <T> T getMapper(Class<T> type, SqlSession sqlSession) {
MapperProxyFactory<T> mapperProxyFactory = (MapperProxyFactory)this.knownMappers.get(type);
if (mapperProxyFactory == null) {
throw new BindingException("Type " + type + " is not known to the MapperRegistry.");
} else {
try {
return mapperProxyFactory.newInstance(sqlSession);
} catch (Exception var5) {
throw new BindingException("Error getting mapper instance. Cause: " + var5, var5);
}
}
}
总结：
对于一个MapperInterface，在Spring中会存在一个BeanDifition，两个实例：MapperFactory<MapperInterface.class> 和 ProxyBean。
Mybatis-Spring（2）MapperFactoryBean
标签：log override void use erp ring conf ali run
原文地址：https://www.cnblogs.com/sleepingDogs/p/11102335.html
