本文介绍了@Async正在杀死Hibernate事务的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我正在为我的REST api使用Open-Session-In-View事务模型:

I am using an Open-Session-In-View transaction model for my REST api like this:

@Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
      sessionFactory.getCurrentSession().beginTransaction();
      chain.doFilter(request, response);
      sessionFactory.getCurrentSession().getTransaction().commit();
}

这项工作很好.我想添加@Async功能.所以我创建了:

This work just fine. I wanted to add @Async abilities. So I created:

@Configuration
@EnableAsync
public class AsyncConfig implements AsyncConfigurer {

    @Override
    @Bean(destroyMethod="shutdown")
    public Executor getAsyncExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(18);
        executor.setMaxPoolSize(18);
        executor.initialize();
        executor.setDaemon(true);
        executor.setWaitForTasksToCompleteOnShutdown(false);
        return executor;
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return new SimpleAsyncUncaughtExceptionHandler();
    }
}

和:

@Component
public class AsyncMarketCaller {

    @Inject
    MarketManagerFactory marketManagerFactory;

    @Async
    public Future<List<Product>> getProducts(){

        MarketManager productManager = marketManagerFactory.obtainMarketManager(market);
        result = productManager.getProducts();
        ....
    }
}

productManager调用另一个@Service

The productManager makes a call to another @Service

@Service
public class DefaultIdentifierManager implements IdentifierManager{
     @Inject
    UpcEanDAO upcEanDAO;

      @Override
    public String getTitleForIdentifier(String identifier){
        UpcEan upcEan = upcEanDAO.find(identifier);
    }
}

但是,对于upcEanDAO.find(identifier),我得到一个例外:

however, for upcEanDAO.find(identifier) I get an exception:

Caused by: org.hibernate.HibernateException: get is not valid without active transaction

在添加@AsyncgetProducts()进行异步调用的功能之前,它工作得很好,因此我假设@Async杀死了我用Hibernate打开的事务.

Before I added the @Async ability to make async calls to getProducts() it worked just fine so I assume that @Async kills the transaction that I opened with Hibernate.

我尝试根据此处的另一个答案@Transactional添加到以@Async注释的方法,但这无济于事.

I tried adding based on another answer here, @Transactional to the method annotated with @Async but it doesn't help.

有什么主意吗?

已编辑

我对代码进行了编辑

@Component
public class AsyncMarketCaller {

    @Inject
    AsyncMarketService asyncMarketService;

    @Async
    public Future<List<Product>> getProducts(){
        asyncMarketService.getProducts();
    }
}

@Service
public class AsyncMarketService {

    @Inject
    MarketManagerFactory marketManagerFactory;

    @Transactional
    public Future<List<Product>> getProducts()
     ....
}

}

我在日志中看到

50689 DEBUG [localhost-startStop-1] org.springframework.transaction.annotation.AnnotationTransactionAttributeSource - Adding transactional method 'AsyncMarketService.getProducts' with attribute: PROPAGATION_REQUIRED,ISOLATION_DEFAULT; ''

但是没有帮助.请注意,我的方法AsyncMarketService.getProducts不会直接调用数据库,而是会调用其他方法,只有其中一个会进行调用.

but it doesn't help. Please note that my method AsyncMarketService.getProducts doesn't call directly the DB, it calls to other methods and only one of them will make the call.

我还添加了一个实际调用DB:@Transactional的对象

I also added above the one that actually make the call to DB:@Transactional

49992 DEBUG [localhost-startStop-1] org.springframework.transaction.annotation.AnnotationTransactionAttributeSource - Adding transactional method 'DefaultIdentifierManager.getTitleForIdentifier' with attribute: PROPAGATION_REQUIRED,ISOLATION_DEFAULT; ''

推荐答案

休眠事务在ThreadLocal基础上工作.

Hibernate transactions work on a ThreadLocal basis.

当您将另一个线程与@Async一起使用时,将没有活动的事务.

As you use another thread with @Async there will be no transaction active.

您可以通过让async方法调用另一个由@Transactional注释的bean来实现此功能.

You can achieve this functionality by having the async method calling another bean which is annotated by @Transactional.

在这里,我将进一步解释这种方法:使用Spring Data和Hibernate时如何正确执行后台线程?

Here I explain this approach a little bit more:How do I properly do a background thread when using Spring Data and Hibernate?

这篇关于@Async正在杀死Hibernate事务的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-04 06:52
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