hibernate-envers RevisionListener彈簧集成spring bean

Question

我需要在hibernate-envers的修訂監聽器中進行一些數據庫處理。爲此，我需要Spring Framework的插件功能。這如何實現？這是代表需求的代碼，但CustomRevisionListener由Envers代碼中的構造函數實例化。 Spring只有SecurityContextHolder作爲靜態服務定位器。如何注入其他豆類？

@Service 
public class CustomRevisionListener implements EntityTrackingRevisionListener { 

     @Resource 
     private PersistenceManagerHibernate persistenceManagerHibernate; 

     public void newRevision(Object revisionEntity) { 
       CustomRevisionEntity revision = (CustomRevisionEntity) revisionEntity; 
    revision.setUsername(getUsername()); 
     } 


     public String getUsername() { 
    final SecurityContext context = SecurityContextHolder.getContext(); 
    if (context != null) { 
     if (context.getAuthentication() != null) { 
        return context.getAuthentication().getName(); 
     } else { 
        return "anonymous"; 
     } 
    } 
    return "anonymous"; 
     } 

     @Override 
     public void entityChanged(@SuppressWarnings("rawtypes") Class entityClass, String entityName, Serializable entityId, RevisionType revisionType, Object revisionEntity) { 
       CustomRevisionEntity revision = (CustomRevisionEntity) revisionEntity; 
       revision.setEntityId(entityId.toString()); 
       revision.setEntityName(entityName); 
       revision.setRevisionType((int)revisionType.getRepresentation()); 
       Auditable auditable = null; 
       if (entityId instanceof Long) { 
          auditable = persistenceManagerHibernate.findById(entityClass, (Long)entityId); 
       } 
       revision.setGroupName(auditable.getAuditGroupName()); 
       revision.setGroupEntityId(auditable.getAuditGroupId()); 
     } 
    } 

Answer 1

由於CustomRevisionListener是由Envers中的構造函數實例化的，所以您必須找到另一種方法來檢索Spring託管bean的句柄。

您可以創建一個實用工具類來實現這一目標：

/** 
* Utility class which provides lookup services for Spring managed beans from 
* within unmanaged beans. 
*/ 
@Component 
public class ContextLookup implements ApplicationContextAware { 

    private static ApplicationContext sApplicationContext; 

    @Override 
    public void setApplicationContext(ApplicationContext aApplicationContext) 
                 throws BeansException { 
     setContext(aApplicationContext); 
    } 

    public static void setContext(ApplicationContext aApplicationContext) { 
     sApplicationContext = aApplicationContext; 
    } 

    protected static ApplicationContext getApplicationContext() { 
     return sApplicationContext; 
    } 

    public static Object getBean(String aName) { 
    if (sApplicationContext != null) { 
     return sApplicationContext.getBean(aName); 
    } 
    return null; 
    } 

    public static <T> T getBean(Class<T> aClass) { 
     if (sApplicationContext != null) { 
     return sApplicationContext.getBean(aClass); 
     } 
     return null; 
    } 
} 

，並在您CustomRevisionListener

public class CustomRevisionListener { 

    public void myMethod() { 
     .. 
     // get a handle to your spring managed bean 
     Foo foo = (Foo)ContextLookup.getBean("mySpringManagedBean"); 
     .. 
    } 

}