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回顾hibernate refernce,在自定义hibernate intecerptor,events listencer模块,假设了个实现针对某个对象数据操作,要求实现操作日志的记录的功能需求,以下是实现方案的记录:
方案1:采用hibernate interceptor实现:
public class SampleEntityInterceptor extends EmptyInterceptor {
    
private static final long serialVersionUID = 1L;
    
protected Log logger = LogFactory.getLog(SampleEntityInterceptor.class);

    @Override
    
public void onDelete(Object entity, Serializable id, Object[] state,
            String[] propertyNames, Type[] types) {
        logger.info(
" ### SampleEntityInterceptor.onDelete:");
        // process......
    }

    @Override
    
public boolean onLoad(Object entity, Serializable id, Object[] state,
            String[] propertyNames, Type[] types) {
        logger.info(
" ### SampleEntityInterceptor.onLoad:");
        // process......
        
return false;
    }

    @Override
    
public boolean onSave(Object entity, Serializable id, Object[] state,
            String[] propertyNames, Type[] types) {
        logger.info(
" ### SampleEntityInterceptor.onSave:");
        // process......
        
return false;
    }
}
spring配置:
    <!-- 自定义Hibernate Entity Interceptor -->
    
<bean id="sampleEntityInterceptor" class="org.hook.hibernate.domain.interceptor.SampleEntityInterceptor" />

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
        
<property name="dataSource" ref="dataSource" />
        
<property name="namingStrategy">
            
<bean class="org.hibernate.cfg.ImprovedNamingStrategy" />
        
</property>
        
<property name="hibernateProperties">
            
<props>
               
......
            
</props>
        
</property>
        
<property name="packagesToScan" value="org.hook.hibernate.domain.*"/>
        
<property name="entityInterceptor">
            
<ref bean="sampleEntityInterceptor"/>
        
</property>
    
</bean>
SampleEntityInterceptor 中即可对拥有自定义Annotation的entity填充操作日志信息。
缺点:把日志信息分散到entity属性中,不利于统一管理和维护。

方案2:采用hibernate eventlistener实现:
public class SampleDefaultLoadEventListener extends DefaultLoadEventListener {
    private static final long serialVersionUID = 1L;
    protected Log logger = LogFactory
            .getLog(SampleDefaultLoadEventListener.class);

    @Override
    public void onLoad(LoadEvent event, LoadEventListener.LoadType loadType)
            throws HibernateException {
        super.onLoad(event, loadType);
        logger.info(" ### SampleDefaultLoadEventListener.onLoad:");
        // process......
    }
}
spring配置:
<bean id="sampleDefaultLoadEventListener" class="org.hook.hibernate.domain.eventlistener.SampleDefaultLoadEventListener" />

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
        
<property name="dataSource" ref="dataSource" />
        
<property name="namingStrategy">
            
<bean class="org.hibernate.cfg.ImprovedNamingStrategy" />
        
</property>
        
<property name="hibernateProperties">
            
<props>
               
......
            
</props>
        
</property>
        
<property name="packagesToScan" value="org.hook.hibernate.domain.*"/>
        
<property name="entityInterceptor">
            
<ref bean="sampleEntityInterceptor"/>
        
</property>
        
<property name="eventListeners">
            
<map>
                
<entry key="load">
                    
<ref bean="sampleDefaultLoadEventListener" />
                
</entry>
            
</map>
        
</property>
    
</bean>
通过event.getSession()可获取到hibernate session.
另外,需要注意的是,spring提供对sessionfactory的封装实现中(这里采用的是AnnotationSessionFactoryBean),所继承的父类在注入eventerlistener时,提供的是个map属性,所以自定义listener只能采用继承Default listener的方式实现。
附上LocalSessionFactoryBean对eventerlistener的初始化代码:
            if (this.eventListeners != null) {
                
// Register specified Hibernate event listeners.
                for (Iterator it = this.eventListeners.entrySet().iterator(); it.hasNext();) {
                    Map.Entry entry 
= (Map.Entry) it.next();
                    Assert.isTrue(entry.getKey() 
instanceof String, "Event listener key needs to be of type String");
                    String listenerType 
= (String) entry.getKey();
                    Object listenerObject 
= entry.getValue();
                    
if (listenerObject instanceof Collection) {
                        Collection listeners 
= (Collection) listenerObject;
                        EventListeners listenerRegistry 
= config.getEventListeners();
                        Object[] listenerArray 
=
                                (Object[]) Array.newInstance(listenerRegistry.getListenerClassFor(listenerType), listeners.size());
                        listenerArray 
= listeners.toArray(listenerArray);
                        config.setListeners(listenerType, listenerArray);
                    }
                    
else {
                        config.setListener(listenerType, listenerObject);
                    }
                }
            }

posted on 2008-11-18 20:31 钩子 阅读(1812) 评论(0)  编辑  收藏 所属分类: jeeopensources工作笔记

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