Spring boot (21)多数据源引起的循环引用和AutoConfigureAfter失效的问题

1.问题起因

目前写SPringBoot引入多数据源路由
遇到了需要控制加载顺序的问题

@Configuration
@MapperScan(basePackages = "com.gaotianyue.dao")
public class DataSourceConfig {第一步@Bean@ConfigurationProperties(prefix = "spring.datasource")public DataSource dataSource1() {return DataSourceBuilder.create().build();}@Bean@ConfigurationProperties(prefix = "spring.datasource")public DataSource dataSource2() {return = DataSourceBuilder.create().build();}
}

@Configuration
public class RoutingDataSourceConfig {第二步@Bean(name="rwDataSource")public ReadWriteRoutingDataSource rwDataSource(@Qualifier("dataSource1") DataSource dataSource1, @Qualifier("dataSource2") DataSource dataSource2) {ReadWriteRoutingDataSource ds = new ReadWriteRoutingDataSource();Map<Object, Object> targetDataSources = new HashMap<>();targetDataSources.put(Master.class, dataSource1);targetDataSources.put(Slave.class, dataSource2);ds.setTargetDataSources(targetDataSources);ds.setDefaultTargetDataSource(dataSource1);//默认数据源return ds;}第三部报错@Beanpublic SqlSessionFactory ds1SqlSessionFactory(@Qualifier("rwDataSource") ReadWriteRoutingDataSource dataSource) throws Exception {SqlSessionFactoryBean bean = new SqlSessionFactoryBean();bean.setDataSource(dataSource);bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mappers/*.xml"));return bean.getObject();}
}

两段程序本来在一个类中
引用情况如下：

            |----<>SqlSessionFactoryBean ||<>-- -- DataSource|           /|\|            ||<>-- -- RWRoutingDataSoure||<>---DataSource

启动后发现出现循环引用错误
单独保留DataSource RWRoutingDataSoure的配置没有问题，一旦SqlSessionFactoryBean从参数注入RWRoutingDataSoure 就会爆出

Error creating bean with name 'rwDataSource': Requested bean is currently in creation: Is there an unresolvable circular reference?

首先想到控制加载顺序的问题。首先想到@AutoConfigureAfter({DataSourceConfig.class})这一注解，但是加上这一注解是无效的。即使有不少人使用了@AutoConfigureAfter({DataSourceConfig.class}) + @Configuration的配置，其实并未起到作用。阅资料还需要配置spring.factories文件，
META-INF/spring.factories

# Auto Configure
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.gaotianyue.autoconfigure.DataSourceConfig,\
com.gaotianyue.autoconfigure.RoutingDataSourceConfig

修改App.java使配置类的路径不能被SpringBootApplication扫描。

@SpringBootApplication(scanBasePackages={"com.gaotianyue.manager"})
public class App {public static void main(String[] args) throws Exception {AppStarter.initManagers(SpringApplication.run(App.class, args));}
}

但是依然“不能够控制加载顺序！”

目前循环依赖的起因初步判断跟
org.springframework.boot.autoconfigure.jdbc.DataSourceInitializer有关

@PostConstructpublic void init() {if (!this.properties.isInitialize()) {logger.debug("Initialization disabled (not running DDL scripts)");return;}if (this.applicationContext.getBeanNamesForType(DataSource.class, false,false).length > 0) {this.dataSource = this.applicationContext.getBean(DataSource.class);}if (this.dataSource == null) {logger.debug("No DataSource found so not initializing");return;}runSchemaScripts();}

和Object org.springframework.boot.autoconfigure.jdbc.DataSourceInitializerPostProcessor.postProcessAfterInitialization(Object bean, String beanName) throws BeansException

    @Overridepublic Object postProcessAfterInitialization(Object bean, String beanName)throws BeansException {if (bean instanceof DataSource) {// force initialization of this bean as soon as we see a DataSourcethis.beanFactory.getBean(DataSourceInitializer.class);}return bean;}

有关，正在努力测试中

解决方案1

/*** 读写分离数据源配置*/
@Configuration
//@EnableTransactionManagement //事务
@MapperScan(basePackages = "com.vipkid.coursera.manager.dao")//scan
public class DataSourceConfig {public DataSourceConfig(){LogCore.BASE.info("myabtis multiple datasources configure start !");}@Bean@ConfigurationProperties(prefix = "spring.datasource")public DataSource dataSource1() {DataSource ds = (DataSource) DataSourceBuilder.create().build();LogCore.BASE.info("dataSource1.hashCode={}", Util.objString(ds));return ds;}@Bean@ConfigurationProperties(prefix = "spring.datasource")public DataSource dataSource2() {DataSource ds = (DataSource) DataSourceBuilder.create().build();LogCore.BASE.info("dataSource2.hashCode={}", Util.objString(ds));return ds;}/**装配路由数据源*/@Bean(name="rwDataSource")@Autowiredpublic DataSourceBeanWrapper<ReadWriteDataSourceRouter> rwDataSource(@Qualifier("dataSource1") DataSource dataSource1, @Qualifier("dataSource2") DataSource dataSource2) {ReadWriteDataSourceRouter ds = new ReadWriteDataSourceRouter();Map<Object, Object> targetDataSources = new HashMap<>();targetDataSources.put(Master.class, dataSource1);targetDataSources.put(Slave.class, dataSource2);ds.setTargetDataSources(targetDataSources);ds.setDefaultTargetDataSource(dataSource1);//默认数据源DataSourceBeanWrapper<ReadWriteDataSourceRouter> t = new DataSourceBeanWrapper<>(ds);return t;}@Beanpublic SqlSessionFactory ds1SqlSessionFactory(DataSourceBeanWrapper<ReadWriteDataSourceRouter> dataSource1) throws Exception {SqlSessionFactoryBean bean = new SqlSessionFactoryBean();bean.setDataSource(dataSource1.getDataSource());bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mappers/**/*.xml"));return bean.getObject();}@Bean(name = "ds1TransactionManager")public DataSourceTransactionManager ds1TransactionManager(@Qualifier("rwDataSource") DataSourceBeanWrapper<ReadWriteDataSourceRouter> dataSource1) {return new DataSourceTransactionManager(dataSource1.getDataSource());}@PostConstruct void after(){LogCore.BASE.info("myabtis multiple datasources configure after !");}
}

public final class DataSourceBeanWrapper<T extends DataSource> implements InitializingBean{private T dataSource;public DataSourceBeanWrapper(T realDataSource) {super();this.dataSource = realDataSource;}public T getDataSource() {return dataSource;}public void setDataSource(T dataSource) {this.dataSource = dataSource;}@Overridepublic void afterPropertiesSet() throws Exception{if (this.dataSource == null) {throw new IllegalArgumentException("Property 'dataSources' is required");}if(this.dataSource instanceof InitializingBean){((InitializingBean)dataSource).afterPropertiesSet();}}@Overridepublic String toString() {StringBuilder builder = new StringBuilder();builder.append("DataSourceBeanWrapper =");builder.append(getClass().getName() + "@" + Integer.toHexString(hashCode()));builder.append("; dataSource=");builder.append(dataSource);return builder.toString();}
}

解决方案2

Configuration
//@EnableTransactionManagement //事务
@MapperScan(basePackages = "com.vipkid.coursera.manager.dao")//scan
public class DataSourceConfig {public DataSourceConfig(){LogCore.BASE.info("myabtis multiple datasources configure start !");}@Bean(name="dataSource1")@ConfigurationProperties(prefix = "spring.datasource")public DataSource dataSource1() {DataSource ds = DataSourceBuilder.create().build();LogCore.BASE.info("dataSource1.hashCode={}", Util.objString(ds));return ds;}@Bean@ConfigurationProperties(prefix = "spring.datasource")public DataSource dataSource2() {DataSource ds = DataSourceBuilder.create().build();LogCore.BASE.info("dataSource2.hashCode={}", Util.objString(ds));return ds;}/*** 装配路由数据源* @see {@link DataSourceBeanWrapper}*/@Bean@DependsOn({ "dataSource1", "dataSource2"})public DataSource rwDataSource() {ReadWriteDataSourceRouter ds = new ReadWriteDataSourceRouter();Map<Object, Object> targetDataSources = new HashMap<>();targetDataSources.put(Master.class, dataSource1());targetDataSources.put(Slave.class, dataSource2());ds.setTargetDataSources(targetDataSources);ds.setDefaultTargetDataSource(dataSource1());//默认数据源LogCore.BASE.info("ReadWriteDataSourceRouter init ={}", ds);return ds;}@Beanpublic SqlSessionFactory ds1SqlSessionFactory(DataSource rwDataSource) throws Exception {SqlSessionFactoryBean bean = new SqlSessionFactoryBean();bean.setDataSource(rwDataSource);bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mappers/**/*.xml"));return bean.getObject();}@Bean(name = "ds1TransactionManager")public DataSourceTransactionManager ds1TransactionManager(@Qualifier("rwDataSource") DataSource rwDataSource) {return new DataSourceTransactionManager(rwDataSource);}@PostConstruct void after(){LogCore.BASE.info("myabtis multiple datasources configure after !");}
}