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Service Override in JNDI
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created by <a href="http://community.jboss.org/people/ThomasGo">Thomas Goettlich</a> in <i>JNDI and Naming</i> - <a href="http://community.jboss.org/message/572722#572722">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>before I ask my question, here's a short description of what we try to do:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>We are building a platform for our projects that consists of multiple components.</p><p>Each component contains entities, data access objects and business services.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>If we use those components in a project and need to extend the entities, we inherit from the base entity and the dao but not from the service.</p><p>The daos are abstract generic services, i.e. they provide generic implementations but are not annotated with @Stateless.</p><p>The services are neither generic nor abstract and thus might be extended but the logic must not be overridden.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>A short example to illustrate my description:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The user component contains the following classes:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>@Entity</p><p>UserEntity{ /<strong>code here</strong>/ }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>abstract class UserDAOBean</p><p>{</p><p>     doCrudStuff(Entity user) { ... }</p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>@Stateless</p><p>@Local (IUserService.class)</p><p>class UserServiceBean</p><p>{</p><p>  doBusinessLogic(UserEntity user) { ... }</p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The project needs to extend UserEntity and thus we have the following:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>@Entity</p><p>ProjectUserEntity extends UserEntity { /<strong>additional attributes</strong>/ }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>@Stateless</p><p>ProjectUserDAOBean extends UserDAOBean</p><p>{</p><p> @Override</p><p> doCrudStuff(ProjectUserEntity user) { /*some extended or changed code here */ }</p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This works so far.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The problem are the business services.</p><p>When I want to extend UserServiceBean, that's no problem. I then just add a ProjectUserServiceBean and call that where needed.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>However, when I need to override a method - e.g. doBusinessLogic - I need other services to use the overriding service instead of the base one.</p><p>I can't change the calling services and thus have to rely on JNDI to return the correct service.</p><p>The problem is, that the JBoss 4.2.3 implemantion (that's what we're using) returns any service that implements the IUserService interface (and declares it as its local interface).</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>So I need UserServiceBean not to be returned by JNDI or not be registered in JNDI at all.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Finally the question: Is that possible? If so, how?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks in advance.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thomas</p></div>
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<p style="margin: 0;">Reply to this message by <a href="http://community.jboss.org/message/572722#572722">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in JNDI and Naming at <a href="http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2083">Community</a></p>
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