hibernate-envers RevisionListener spring 集成为 spring bean

Posted 2023-02-26

【中文标题】hibernate-envers RevisionListener spring 集成为 spring bean

【英文标题】：hibernate-envers RevisionListener spring integration as spring bean

【发布时间】：2012-01-21 03:15:04

【问题描述】：

我需要在 hibernate-envers 的修订监听器中做一些数据库处理。为此，我需要 Spring Framework 的注入功能。如何实施？这是表示需要的代码，但 CustomRevisionListener 由 Envers 代码中的构造函数实例化。 Spring 只有SecurityContextHolder 作为静态服务定位器。如何注入其他bean？

@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());
      
  

【参考方案1】：

由于 CustomRevisionListener 是由 Envers 中的构造函数实例化的，因此您必须找到另一种方法来检索 Spring 托管 bean 的句柄。

您可以创建一个实用程序类来实现此目的：

/**
 * 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;
   
 

在您的 CustomRevisionListener 中

public class CustomRevisionListener 

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