Java 使用Hibernate4';s积分器模式和Spring';s依赖注入
我习惯于使用Spring进行依赖项注入,如下所示:Java 使用Hibernate4';s积分器模式和Spring';s依赖注入,java,spring,hibernate,spring-mvc,inversion-of-control,Java,Spring,Hibernate,Spring Mvc,Inversion Of Control,我习惯于使用Spring进行依赖项注入,如下所示: <context:component-scan base-package="org.emmerich.myapp" /> 然而,随着Hibernate 4.0的变化,我们现在建议使用新的Integrator接口进行服务发现。这包括为触发器添加事件侦听器,如postpdate,postDelete等 不幸的是,这并不能很好地通过带注释的依赖项进行依赖项注入。我有以下设置: 我定义了一个积分器,用于将我的侦听器添加到ServiceFa
<context:component-scan base-package="org.emmerich.myapp" />
然而,随着Hibernate 4.0的变化,我们现在建议使用新的Integrator
接口进行服务发现。这包括为触发器添加事件侦听器,如postpdate
,postDelete
等
不幸的是,这并不能很好地通过带注释的依赖项进行依赖项注入。我有以下设置:
我定义了一个积分器,用于将我的侦听器添加到ServiceFactory
。这在文件META-INF/services/org.hibernate.integrator.spi.integrator
中引用
public class MyIntegrator implements Integrator {
private MyListener listener;
public MyIntegrator() {
listener = new MyListener();
}
@Override
public void integrate(Configuration configuration,
SessionFactoryImplementor sessionFactory,
SessionFactoryServiceRegistry serviceRegistry) {
final EventListenerRegistry eventRegistry =
serviceRegistry.getService(EventListenerRegistry.class);
eventRegistry.prependListeners(EventType.POST_COMMIT_INSERT, listener);
}
我还定义了类MyListener
,它看起来像典型的事件监听器
@Component
public class MyListener implements PostInsertEventListener {
@Autowired
private Dependent dependent;
public void onPostInsert(PostInsertEvent event) {
// dependent == null
}
}
不幸的是,正如评论所示,这是行不通的。我想这是因为我在MyIntegrator
内部实例化MyListener
,它不会拾取组件,也不会自动连接组件。但是,如果我尝试这样做:
@Component
public class MyIntegrator {
@Autowired
private MyListener listener;
...
}
那么侦听器不是自动连接的
首先,使用Spring执行新建MyListener()
时感觉不对。我希望能够将其定义为一个自动连接的依赖项,并让Spring为我创建一个单例。我的问题是:
在新的Integrator接口中使用依赖项注入的最佳方法是什么?积分器用于构建SessionFactory,因此当要求它们自己进行集成时,我想没有可用的应用程序上下文。正因为如此,我在Integrator中需要的任何bean都需要以“老式”的方式创建,并且不会在它们上接收自动连线
我对春天的世界很陌生,你能说这是我应该期待看到的吗?我知道当我在SessionFactory中时,我在不同的应用程序范围内,但是即使我通过new
创建bean,是否有办法获得对bean的引用并启用autowire
我提出的解决方案使用了ApplicationContextAware
。这意味着每当上下文可用时,MyListener
就会收到对ApplicationContext
的引用,我在方法调用时从上下文引用bean,而不是在bean构造时。使用new
创建bean并没有限制这一点,因此Spring仍然为我提供了应用程序上下文:
@Component
public class MyListener implements PostInsertEventListener, ApplicationContextAware {
private static ApplicationContext context;
public void onPostInsert(PostInsertEvent event) {
// getDependent() == correct!
}
public void setApplicationContext(ApplicationContext context) throws BeanException {
this.context = context;
}
public Dependent getDependent() {
return context.getBean(Dependent.class);
}
}
有更好的方法吗?如评论中所述,我采用了另一种集成Spring管理的HibernateEventListeners的方法。代码如下: Spring管理的Hibernate事件侦听器的标识符接口:
public interface HibernateEventListener { }
HibernateIntegrator:
@Service
public class HibernateSpringIntegrator {
private static final Logger log = LoggerFactory.getLogger(HibernateSpringIntegrator.class);
@Autowired
private HibernateEntityManagerFactory entityManagerFactory;
@Autowired
private HibernateSpringIntegratorRegistry hibernateSpringIntegratorRegistry;
@PostConstruct
public void registerListeners() {
log.debug("Registering Spring managed HibernateEventListeners");
EventListenerRegistry listenerRegistry = ((SessionFactoryImpl) entityManagerFactory
.getSessionFactory()).getServiceRegistry().getService(
EventListenerRegistry.class);
List<HibernateEventListener> eventListeners = hibernateSpringIntegratorRegistry
.getHibernateEventListeners();
for (HibernateEventListener hel : eventListeners) {
log.debug("Registering: {}", hel.getClass());
if (PreInsertEventListener.class.isAssignableFrom(hel.getClass())) {
listenerRegistry.appendListeners(EventType.PRE_INSERT,
(PreInsertEventListener) hel);
}
if (PreUpdateEventListener.class.isAssignableFrom(hel.getClass())) {
listenerRegistry.appendListeners(EventType.PRE_UPDATE,
(PreUpdateEventListener) hel);
}
if (PreDeleteEventListener.class.isAssignableFrom(hel.getClass())) {
listenerRegistry.appendListeners(EventType.PRE_DELETE,
(PreDeleteEventListener) hel);
}
if (PostInsertEventListener.class.isAssignableFrom(hel.getClass())) {
listenerRegistry.appendListeners(EventType.POST_INSERT,
(PostInsertEventListener) hel);
}
if (PostUpdateEventListener.class.isAssignableFrom(hel.getClass())) {
listenerRegistry.appendListeners(EventType.POST_UPDATE,
(PostUpdateEventListener) hel);
}
if (PostDeleteEventListener.class.isAssignableFrom(hel.getClass())) {
listenerRegistry.appendListeners(EventType.POST_DELETE,
(PostDeleteEventListener) hel);
}
// Currently we do not need other types of eventListeners. Else this method needs to be extended.
}
}
}
@服务
公共类HibernateStringIntegrator{
私有静态最终记录器log=LoggerFactory.getLogger(HibernateSpringIntegrator.class);
@自动连线
私有HibernateEntityManager工厂;
@自动连线
私有HibernateStringIntegratorRegistry HibernateStringIntegratorRegistry;
@施工后
public void registerListeners(){
debug(“注册Spring管理的HibernateEventListeners”);
EventListenerRegistry listenerRegistry=((SessionFactoryImpl)entityManagerFactory
.getSessionFactory()).getServiceRegistry().getService(
EventListenerRegistry.class);
List eventListeners=HibernateStringIntegratorRegistry
.getHibernateEventListeners();
for(HibernateeEventListener hel:eventListeners){
debug(“注册:{}”,hel.getClass());
if(PreInsertEventListener.class.isAssignableFrom(hel.getClass())){
listenerRegistry.appendListeners(EventType.PRE_INSERT,
(预插入事件列表器)hel);
}
if(PreUpdateEventListener.class.isAssignableFrom(hel.getClass())){
listenerRegistry.appendListeners(EventType.PRE_UPDATE,
(预更新事件列表)hel);
}
if(PreDeleteEventListener.class.isAssignableFrom(hel.getClass())){
listenerRegistry.appendListeners(EventType.PRE_DELETE,
(PreDeleteEventListener)hel);
}
if(PostInsertEventListener.class.isAssignableFrom(hel.getClass())){
listenerRegistry.appendListeners(EventType.POST_INSERT,
(PostInsertEventListener)hel);
}
if(PostUpdateEventListener.class.isAssignableFrom(hel.getClass())){
listenerRegistry.appendListeners(EventType.POST\u更新,
(PositUpdateEventListener)hel);
}
if(PostDeleteEventListener.class.isAssignableFrom(hel.getClass())){
listenerRegistry.appendListeners(EventType.POST_DELETE,
(PostDeleteEventListener)hel);
}
//目前我们不需要其他类型的EventListener。否则此方法需要扩展。
}
}
}
“登记处”:
@组件
公共类HibernateStringIntegratorRegistry{
@自动连线(必需=错误)
私有列表hibernateEventListeners;
公共列表getHibernateEventListeners(){
如果(hibernateEventListeners==null){
返回集合。emptyList();
}
返回hibernateEventListeners;
}
}
下面是一个示例实现:
@Component
public class MailGenerationEventListener implements HibernateEventListener,
PostDeleteEventListener, PostInsertEventListener, PostUpdateEventListener {
@Override
public void onPostDelete(PostDeleteEvent event) {
Class<?> entityClass = event.getEntity().getClass();
...
}
@Override
public void onPostInsert(PostInsertEvent event) {
Class<?> entityClass = event.getEntity().getClass();
...
}
@Override
public void onPostUpdate(PostUpdateEvent event) {
Class<?> entityClass = event.getEntity().getClass();
...
}
}
@组件
公共类MailGenerationEventListener实现HibernateEventListener,
PostDeleteEventListener、PostInsertEventListener、PostUpdateEventListener{
@凌驾
PostDelete上的公共无效(PostDeleteEvent事件){
类entityClass=event.getEntity().getClass();
...
}
@凌驾
公共无效onPostInsert(PostInsertEvent事件){
类entityClass=event.getEntity().getClass();
...
}
@爱
@Component
public class HibernateSpringIntegratorRegistry {
@Autowired(required = false)
private List<HibernateEventListener> hibernateEventListeners;
public List<HibernateEventListener> getHibernateEventListeners() {
if (hibernateEventListeners == null) {
return Collections.emptyList();
}
return hibernateEventListeners;
}
}
@Component
public class MailGenerationEventListener implements HibernateEventListener,
PostDeleteEventListener, PostInsertEventListener, PostUpdateEventListener {
@Override
public void onPostDelete(PostDeleteEvent event) {
Class<?> entityClass = event.getEntity().getClass();
...
}
@Override
public void onPostInsert(PostInsertEvent event) {
Class<?> entityClass = event.getEntity().getClass();
...
}
@Override
public void onPostUpdate(PostUpdateEvent event) {
Class<?> entityClass = event.getEntity().getClass();
...
}
}
<!-- Make our validators use DI if necessary -->
<bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"/>
<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<!-- other props -->
<property name="hibernateProperties">
<map>
<entry key="javax.persistence.validation.factory" value-ref="validator" />
</map>
</property>
</bean>