在返回 Hibernate 对象的方法上使用 Spring Cacheable 注解

Question

我昨天设置了 Memcached，最终让 Spring @Cachable 注释工作......

这块代码缓存完美：

@Component("CacheProcessor")
public class CacheProcessor {
    @Cacheable(value = "defaultCache", key="'dateTime-'.concat(#anything)")
    public String getDateTime2(String anything) {
        Date d = new Date();
        String response = Long.toString(d.getTime());
        return response;
    }
}

我尝试了为每个请求调用的缓存方法：

@org.springframework.cache.annotation.Cacheable(value="defaultCache", key="username")
public static List<Session> findSessionByUserName(String username) {

    String hql = "SELECT o FROM Session AS o WHERE o.username=:username";
    TypedQuery<Session> query = Session.entityManager().createQuery(hql, Session.class);
    query.setParameter("username", username);
    return query.getResultList();

}

...但我看到的是堆栈跟踪而不是缓存结果：

java.lang.IllegalStateException: Post-processor tried to replace bean instance of type [com.ahp.core.model.Session] with (proxy) object of type [com.sun.proxy.$Proxy66] - not supported for aspect-configured classes!
    at org.springframework.beans.factory.wiring.BeanConfigurerSupport.checkExposedObject(BeanConfigurerSupport.java:168)
    at org.springframework.beans.factory.wiring.BeanConfigurerSupport.configureBean(BeanConfigurerSupport.java:140)
    at org.springframework.beans.factory.aspectj.AnnotationBeanConfigurerAspect.configureBean(AnnotationBeanConfigurerAspect.aj:60)
    at org.springframework.beans.factory.aspectj.AbstractDependencyInjectionAspect.ajc$afterReturning$org_springframework_beans_factory_aspectj_AbstractDependencyInjectionAspect$2$1ea6722c(AbstractDependencyInjectionAspect.aj:91)
    at com.ahp.core.model.Session.<init>(Session.java:20)
    at com.ahp.core.model.Session.entityManager_aroundBody0(Session.java:57)
    at com.ahp.core.model.Session.entityManager(Session.java:1)
    at com.ahp.core.processor.AccountProcessor.validateSession(AccountProcessor.java:545)
    at com.ahp.core.processor.WarehouseProcessor.consume(WarehouseProcessor.java:93)
    at com.ahp.core.processor.WarehouseProcessor.consume(WarehouseProcessor.java:1)
    at com.ahp.messaging.processor.AbstractRPCConsumer.onMessage(AbstractRPCConsumer.java:32)
    at org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter.onMessage(MessageListenerAdapter.java:228)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:756)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:679)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$001(SimpleMessageListenerContainer.java:82)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$1.invokeListener(SimpleMessageListenerContainer.java:167)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.invokeListener(SimpleMessageListenerContainer.java:1241)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:660)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doReceiveAndExecute(SimpleMessageListenerContainer.java:1005)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.receiveAndExecute(SimpleMessageListenerContainer.java:989)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$700(SimpleMessageListenerContainer.java:82)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1103)
    at java.lang.Thread.run(Thread.java:744)

如果有帮助，这里有一个 Session 类的 sn-p，它是由 Spring Roo 生成的，然后使用 Push-In 重构，我去掉了所有的 AspectJ，所以现在它只是一个 Java 类：

@Entity
@Configurable
//@RooJavaBean
//@RooToString
//@RooJpaActiveRecord
public class Session {

    @PersistenceContext
    transient EntityManager entityManager;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Long id;

    @Version
    @Column(name = "version")
    private Integer version;

    @ManyToOne
    private Account account;

    @ManyToOne
    private Company company;

    @Column(name = "qusername")
    private String username;

    ....

如果我删除 Configurable 注释，实体管理器不会被注入，并且会抛出 IllegalStateException。

    public static final EntityManager entityManager() {
        EntityManager em = new Session().entityManager;
        if (em == null)
            throw new IllegalStateException("Entity manager has not been injected (is the Spring Aspects JAR configured as an AJC/AJDT aspects library?)");
        return em;
    }

如何在 aspect-configured 类上进行缓存？

如果不可能，那么在没有方面的情况下使它工作的过程是什么（假设它可以缓存）？

工作解决方案

不得不创建一个SessionService接口：

@RooService(domainTypes = {Session.class })
public interface SessionService {
    public List<Session> findSessionByUserName(String username);
}

SessionServiceImpl：

@Component
public class SessionServiceImpl implements SessionService {
    @Override
    @Cacheable(value="defaultCache", key="#username")
    public List<Session> findSessionByUserName(String username) {
        return Session.findSessionByUserName(username);
    }
}

必须将 Session 类修改为可序列化并返回 Roo 注释。

@Entity
@RooJavaBean
@RooToString
@Configurable
@RooJpaActiveRecord
public class Session implements Serializable {
   ...
}

然后使用我的自动装配会话服务：

@Autowired
SessionService sessionService;

我现在可以使用缓存了：

sessionService.findSessionByUserName(...)

Answer 1

问题是您正在尝试将缓存添加到静态方法（在 Roo ActiveRecord 模式中完成的方式）。您必须在 bean 方法（非静态）上配置缓存层。

一种方法可以是使用 Roo 生成在实体层和 Web 层之间创建一个服务层（查看Roo documentation）。此实用程序创建调用 Roo 实体方法并修改 Contollers 方法以使用它的 Spring beans。因此，您可以使用 @Cacheable 注释此 Service-Bean 的方法，以便在需要时使用缓存。

祝你好运！