如何将spring repo注入hibernate拦截器

Question

我们正在构建一个应用程序，我们需要在历史表中记录实体更新。我正试图通过hibernate拦截器来实现这一点，我们可以设法获得所有的更改，但在将它们插入审计表时遇到困难。

我的JPA配置

public class JPAConfiguration {
 ----
 @Bean(name = "entityManagerFactory")
public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean() throws SQLException {
    LocalContainerEntityManagerFactoryBean factoryBean = new LocalContainerEntityManagerFactoryBean();
    factoryBean.setDataSource(dataSource());
    factoryBean.setPackagesToScan(new String[] {"com.yyy.persist"});
    HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
    vendorAdapter.setShowSql(true);
    // thsi is required in order to enable Query DSL
    vendorAdapter.setDatabasePlatform("org.hibernate.dialect.Oracle10gDialect");
    factoryBean.setJpaVendorAdapter(vendorAdapter);
   // factoryBean.setMappingResources(mappingResources);
    // adding hibernate interceptor
    Properties jpaProperties = new Properties();
    jpaProperties.setProperty("hibernate.ejb.interceptor", "com.yyy.admin.service.AuditInterceptor");
    factoryBean.setJpaProperties(jpaProperties);
    return factoryBean;
}

我的拦截器

public class AuditInterceptor extends EmptyInterceptor {
public boolean onFlushDirty(Object entity, Serializable id, Object[] currentState, Object[] previousState,
        String[] propertyNames, Type[] types) {
     if ( entity instanceof Auditable ) {
    // updates++;
    for (int i = 0; i < propertyNames.length; i++) {
        if ((currentState[i] == null && previousState[i] != null)
                || (currentState[i] != null && previousState[i] == null) || (currentState[i] != null
                        && previousState[i] != null && !currentState[i].equals(previousState[i]))) {
            AuditLog audit = new AuditLog();
            audit.setAction("UPDATE");
            audit.setFieldChanged(propertyNames[i]);
            audit.setOldvalue(previousState[i] != null ? previousState[i].toString() : "");
            audit.setNewvalue(currentState[i] != null ? currentState[i].toString() : "");
            audit.setTimeStamp(new Date());
            audit.setUsername(userName);
            entities.add(audit);
        }
    }
    // iterate elements on the report build a entity
 }
    return false;
}
public void afterTransactionCompletion(Transaction tx) {
    if (tx.wasCommitted()) {
if (entities != null) {
            for (AuditLog e : entities) {
                System.out.println(e);
                //.save(e);
            }
            entities = new ArrayList<AuditLog>();
        }
    }
     }

}

方法afterTransactionCompletion我需要将所有审计实体写入DB，自动连接不工作，因为这不是spring管理bean，是否有任何方法可以在此方法中获得DB会话，以便我可以执行插入。

Answer 1

将Spring bean注入非Spring托管类的典型解决方案是通过静态资源占位器。例如，您有一个名为StaticServiceHolder的类，并使用@Component注释它，然后为您想要通过setter注入的spring bean创建静态字段。如:

@Component
public class StaticServiceHolder
{
    public static AuditService auditService;
    @Autowired
    public void setAuditService(AuditService auditService)
    {
        StaticServiceHolder.auditService = auditService;
    }
}

或者更简单的是，如果你有很多这些东西需要注入，那么你可以自动连接ApplicationContext。这样你就可以得到任何你需要的豆子。

@Component
public class ApplicationContextHolder implements ApplicationContextAware {
    public static ApplicationContext applicationContext;
    @Override
    public void setApplicationContext(ApplicationContext ctx) {
        ApplicationContextHolder.applicationContext = ctx;
    }
}
....
//in your hibernate interceptor
YourAuditService auditService = ApplicationContextHolder.applicationContext.getBean(YourAuditService.class);
auditService.saveAuditLog();

无论哪种方式，只要你使用的服务是Transactional，你应该能够在DB中持久化你的东西。希望这对你有用。

对于事务管理器设置:

@Bean
public PlatformTransactionManager transactionManager(EntityManagerFactory emf)
{
    JpaTransactionManager transactionManager = new JpaTransactionManager();
    transactionManager.setEntityManagerFactory(emf);
    return transactionManager;
}

Answer 2

我知道这有点晚了，但也许对别人有帮助。通过使用spring bean而不是类名作为"hibernate.ejb.interceptor"的值，hibernate使用spring bean而不是实例化一个新类。

在这里找到更多:自动休眠拦截器