春季:春季缓存不起作用 [英] Spring : Spring-cache not working

问题描述

我正在研究Spring-MVC应用程序.在探查器经过后端之后，我注意到getCurrentlyAuthenticatedUser()是一个热点.由于这个原因，我想到了使用缓存.不幸的是，它不起作用.一旦用户登录，即使该用户已登录，我也将获得空用户.出了什么问题.当然，当我从XML删除@Cacheable批注和配置时，一切正常.任何帮助都很好.

I am working on a Spring-MVC application. After the profiler went through the backend, I noticed that getCurrentlyAuthenticatedUser() is an hotspot. For the reason I thought of using cache. Unfortunately it is not working. Once the user logs in, I am getting null user, even though the user is logged in. What is going wrong. Ofcourse when I remove the @Cacheable annotation and config from XML, everything works fine. Any help would be nice.

PersonServiceImpl:

PersonServiceImpl :

@Service
@Transactional
public class PersonServiceImpl implements PersonService {

  private final PersonDAO personDAO;

   @Autowired
    public PersonServiceImpl(PersonDAO personDAO) {
        this.personDAO = personDAO;
    }
 @Override
    @Cacheable(value = "person", condition = "#person == null")
    public Person getCurrentlyAuthenticatedUser() {
        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
        if (authentication == null) {
            return null;
        } else {
            return personDAO.findPersonByUsername(authentication.getName());
        }
    }
}

用于使用缓存的配置:

  <cache:annotation-driven />

    <beans:bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager">
        <beans:property name="caches">
            <beans:set>
                <beans:bean class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean"
                        p:name="person"/>
           </beans:set>
        </beans:property>
    </beans:bean>

当我调用此方法时，无论是否登录，我都将返回null.你能帮忙的话，我会很高兴.谢谢.

when I call this method, even if logged in or not, I am getting null back. Any help would be nice. Thanks.

推荐答案

在下面的代码行中:-

@Cacheable(value = "person", condition = "#person == null")

尝试使用除非代替 condition

实际上，您已经提出了一个条件，即仅当人员为null时，缓存才起作用"，这应类似于除非人员为null，否则缓存才起作用".编码愉快.

Actually you have put up an condition that "Caching will only work if the person is null", which should be like "Caching will work unless person is null". Happy coding.

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