Hi Lars-Fredrik!
The biggest benefit of DeltaSpike BeanProvider is that it uses BeanManagerProvider to get the BeanManager. This is really cool if you do NOT have access to the BeanManager at first hand. E.g. if you are in places where there is no injection available by default, e.g. in a JPA-2.0 EntityListener. The get-me-the-instance-from-the-beanmanager part of DeltaSpike is pretty much the same like with Instance<T>. How do testimpl1 and testimpl2 look like? You could even @Inject those directly. If this is more dynamic then use @Inject Instance<Test> provider; for them. Instance extends Provider and adds the ability to dynamically iterate over them, etc. LieGrue, strub >________________________________ > From: Lars-Fredrik Smedberg <[email protected]> >To: "[email protected]" <[email protected]> >Sent: Monday, 17 November 2014, 9:36 >Subject: Performance/design question > > > >Hi! > > >We have a @Produces method that produces dependent CDI beans. The objects we >produce are depenend since we need to use InjectionPoint to get to the >annotations at the injection point. > > >Depending on which annotations are present and their attribute values we >choose which implementation to return. > > >Pseudocode, TestImpl1/2 both implement Test ofcourse, we use Provider<...> >since we do not want to init both 1 and 2 when we only will return one of >them. The implementations both injects other beans, thats why we not create >them using "new". > > >@Produces >public static Test createTest(Provider<TestImpl1> testImpl1, >Provider<TestImpl2> testImpl2, InjectionPoint injectionPoint) { > > > if > (injectionPoint.getAnnotated().getAnnotation(TestAnnotation.class).getAttribute().equals(....)) > { > return testImpl1.get(); > } > > else { > return testImpl2.get(); > } >} > > > >Question: > > >1. What is the overhead of using the above approach with Provider<...> and >get() on the implementation we eventually will use compared to e.g. >DeltaSpikes BeanProvider.getContextualReference ? >2. In OWB can someone explain the process that OWB uses internally when >getBeans() is called? > > >Regards >LF > >-- > >Med vänlig hälsning / Best regards > >Lars-Fredrik Smedberg > >STATEMENT OF CONFIDENTIALITY: >The information contained in this electronic message and any >attachments to this message are intended for the exclusive use of the >address(es) and may contain confidential or privileged information. If >you are not the intended recipient, please notify Lars-Fredrik Smedberg >immediately at [email protected], and destroy all copies of this >message and any attachments. > >
