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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-8881" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-task-676d0597-8ba6-4be2-b65f-27442fc684d9" height="16" width="16" border="0" align="absmiddle" alt="Task" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-8881" style="color: #3b73af; text-decoration: none">HHH-8881</a>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-8881" style="color: #3b73af; text-decoration: none">Ability to call postLoad handlers by clients</a> </span>
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Issue Type:
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Affects Versions:
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4.3.0.Final
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Unassigned
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Components:
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core
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Created:
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20/Jan/14 9:50 AM
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hibernate
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Reporter:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="sg.stuff.email@gmail.com" id="email_sg.stuff.email@gmail.com" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=sg.stuff.email%40gmail.com" style="color:#6c797f;; color: #3b73af; text-decoration: none">Sachin</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">We have a custom built cache and a CustomHibernateLayer.<br /> CustomeHibernateLayer is a thin layer which calls cache-methods like beforeGet, afterGet, beforePut, afterPut around Hibernate calls. <br /> These methods are called as:</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">beforeGet(); // returns entity from cache if its present here<br /> entityManager.find(...)<br /> afterGet();<br /> Similarly for put, calls are:</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">beforePut();<br /> entityManager.save(...)<br /> afterPut(); // puts entity into cache</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Clients also use @PostLoad, @PreLoad, @PreLoad, @EntityListeners etc annotations on the entity objects.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Problem is with getting a cache-hit in beforeGet(). <br /> If there is a cache-hit, the @PostLoad methods and @EntityListeners methods are not called because hibernate's entityManager.find(...) is not called.<br /> Is there a way to force hibernate call @PostLoad methods?</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Hibernate must be following a sequence like:</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">entity = callGetFromDB();<br /> if (entity != null)<br /> runPostLoadHandlers (entity);<br /> So, I want to know if there is a method like runPostLoadHandlers() as mentioned in the above pseudo-code. <br /> If there is no such method, then clients may have to completely re-invent the wheel by reading annotations etc.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Here is a stack-trace for Hibernate code calling post-load handlers by default. <br /> This clearly shows that I should be able to call EJB3PostLoadEventListener.onPostLoad() to fulfill the cache-hit case.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">at java.lang.reflect.Method.invoke(Method.java:597)<br /> at org.hibernate.ejb.event.ListenerCallback.invoke(ListenerCallback.java:48)<br /> at org.hibernate.ejb.event.EntityCallbackHandler.callback(EntityCallbackHandler.java:110)<br /> at org.hibernate.ejb.event.EntityCallbackHandler.postLoad(EntityCallbackHandler.java:103)<br /> at org.hibernate.ejb.event.EJB3PostLoadEventListener.onPostLoad(EJB3PostLoadEventListener.java:49)<br /> at org.hibernate.engine.internal.TwoPhaseLoad.doInitializeEntity(TwoPhaseLoad.java:292)<br /> at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:134)<br /> at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:999)<br /> at org.hibernate.loader.Loader.doQuery(Loader.java:878)<br /> at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:293)<br /> at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:263)<br /> at org.hibernate.loader.Loader.loadEntity(Loader.java:1977)<br /> at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:82)<br /> at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:72)<br /> at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3821)<br /> at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:458)<br /> at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:427)<br /> at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:204)<br /> at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:260)<br /> at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:148)<br /> at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1075)<br /> at org.hibernate.internal.SessionImpl.access$2000(SessionImpl.java:175)<br /> at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.load(SessionImpl.java:2421)<br /> at org.hibernate.internal.SessionImpl.get(SessionImpl.java:975)<br /> at org.hibernate.event.internal.DefaultMergeEventListener.entityIsDetached(DefaultMergeEventListener.java:271)<br /> at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:151)<br /> at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:76)<br /> at org.hibernate.internal.SessionImpl.fireMerge(SessionImpl.java:900)<br /> at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:884)<br /> at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:888)<br /> at org.hibernate.ejb.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:879)</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I tried the below code, but it fails by a NullPointerException.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">SessionImpl session = (SessionImpl) em.getDelegate();<br /> PostLoadEvent postLoadEvent = null;<br /> if (session.isEventSource())</p> { postLoadEvent = new PostLoadEvent(session); }
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">final EventListenerGroup<PostLoadEventListener> listenerGroup = session<br /> .getFactory()<br /> .getServiceRegistry()<br /> .getService(EventListenerRegistry.class)<br /> .getEventListenerGroup(EventType.POST_LOAD);<br /> for (PostLoadEventListener listener : listenerGroup.listeners())</p> { listener.onPostLoad(postLoadEvent); }
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