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Deferring instance creation/injection to CDI
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reply from <a href="http://community.jboss.org/people/marius.bogoevici">Marius Bogoevici</a> in <i>EJB 3.0 Development</i> - <a href="http://community.jboss.org/message/556962#556962">View the full discussion</a>
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<div class="jive-rendered-content"><blockquote class="jive-quote"><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><blockquote class="jive-quote"><p>Marius Bogoevici wrote:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>2) EJB container provides a hook for preprocessing interceptors after instantiation. The main reason is that EJB interceptors may be CDI-injected </p><p>(note: could we reuse the same mechanism as for EJB instantiation, since it boils down to producing an instance of the class? )</p></blockquote><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I'm pretty sure we could do this too.  We have this bit of code, though I haven't verified if it's currently used or cruft:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java"><span style="color: navy;"><strong>public</strong></span> Object createInterceptor(Class<?> interceptorClass) <span style="color: navy;"><strong>throws</strong></span> InstantiationException, IllegalAccessException
   <span style="color: navy;">{</span>
      Object instance = interceptorClass.newInstance();
      InterceptorInjector interceptorInjector = interceptorInjectors.get(interceptorClass);
      <span style="color: navy;"><strong>assert</strong></span> interceptorInjector != <span style="color: navy;"><strong>null</strong></span> : <span style="color: red;">"interceptorInjector not found for "</span> + interceptorClass;
      interceptorInjector.inject(null, instance);
      <span style="color: navy;"><strong>return</strong></span> instance;
   <span style="color: navy;">}</span>
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<p>Plenty of room in there to both abstract away the instantiation or give some post-instantiation callback before the instance is returned.</p>
<p><span style="font-family: 'Lucida Grande', Arial, Helvetica, sans-serif; "><br/></span></p>
</blockquote><p>This looks good, and I see that is currently being used for @Resource injection in the least. The main challenge seems to be that interceptorInjectors is encapsulated and initialized inside org.jboss.ejb3.EJBContainer. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I am wondering if we could provide a mechanism similar to the instantiator for passing a custom interceptor injector at deployment time. </p></div>
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<p style="margin: 0;">Reply to this message by <a href="http://community.jboss.org/message/556962#556962">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in EJB 3.0 Development at <a href="http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2030">Community</a></p>
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