我的主要工作仅涉及读取操作，而另一个工作则进行一些写入操作但使用的是MyISAM engine，它忽略事务，因此我不一定需要事务支持。如何配置Spring Batch以拥有其自己的数据源用于JobRepository，与持有业务数据的数据源分离？最初的数据源配置如下所示：
@Configuration
public class StandaloneInfrastructureConfiguration {
@Autowired
Environment env;
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
em.setDataSource(dataSource());
em.setPackagesToScan(new String[] { "org.podcastpedia.batch.*" });
JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
em.setJpaVendorAdapter(vendorAdapter);
em.setJpaProperties(additionalJpaProperties());
return em;
}
Properties additionalJpaProperties() {
Properties properties = new Properties();
properties.setProperty("hibernate.hbm2ddl.auto", "none");
properties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5Dialect");
properties.setProperty("hibernate.show_sql", "true");
return properties;
}
@Bean
public DataSource dataSource(){
return DataSourceBuilder.create()
.url(env.getProperty("db.url"))
.driverClassName(env.getProperty("db.driver"))
.username(env.getProperty("db.username"))
.password(env.getProperty("db.password"))
.build();
}
@Bean
public PlatformTransactionManager transactionManager(EntityManagerFactory emf){
JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(emf);
return transactionManager;
}
}
然后将它在Job的配置类中导入，其中的@EnableBatchProcessing注释会自动使用它。 我最初的想法是尝试设置配置类扩展DefaultBatchConfigurer，但是我遇到了一个
BeanCurrentlyInCreationException（org.springframework.beans.factory.BeanCurrentlyInCreationException：创建bean时出错，名称为jobBuilders：请求的bean当前正在创建中：是否存在无法解决的循环引用？）:
@Configuration
@EnableBatchProcessing
@Import({StandaloneInfrastructureConfiguration.class, NotifySubscribersServicesConfiguration.class})
public class NotifySubscribersJobConfiguration extends DefaultBatchConfigurer {
@Autowired
private JobBuilderFactory jobBuilders;
@Autowired
private StepBuilderFactory stepBuilders;
@Autowired
private DataSource dataSource;
@Autowired
Environment env;
@Override
@Autowired
public void setDataSource(javax.sql.DataSource dataSource) {
super.setDataSource(batchDataSource());
}
private DataSource batchDataSource(){
return DataSourceBuilder.create()
.url(env.getProperty("batchdb.url"))
.driverClassName(env.getProperty("batchdb.driver"))
.username(env.getProperty("batchdb.username"))
.password(env.getProperty("batchdb.password"))
.build();
}
@Bean
public ItemReader<User> notifySubscribersReader(){
JdbcCursorItemReader<User> reader = new JdbcCursorItemReader<User>();
String sql = "select * from users where is_email_subscriber is not null";
reader.setSql(sql);
reader.setDataSource(dataSource);
reader.setRowMapper(rowMapper());
return reader;
}
........
}
非常欢迎提出任何想法。该项目可在GitHub上获得 - https://github.com/podcastpedia/podcastpedia-batch
非常感谢。