Hi Elek,
personally I think Guice can helps you also in resolving this kind of
problem... maybe Robbie can provides a better solution than I can do.
Best regards,
Simone
2008/9/1 Elek Márton <[EMAIL PROTECTED]>:
>
> Thanks your answers,
>
> Unfortunately I can't use another framework: my goal is (or was?) to
> implement an EJB3 compatible container with Guice. (I need it to
> construct a test framework.).
>
> In an EJB container the name of the persistence unit is a free
> variable. I hope that I understood well your solutions, but I think
> it's not enough dynamic. If I would like to use the solution above
> than I must use reflection and scan all of my EJB beans, and create as
> many binding as many persistence units are used in the code. I hoped
> it is possible to do only with Guice and without Java reflection api.
> But it could be possible only if the Provider interface contains some
> parameter about the EntityManager field and its annotation.
>
> So (as I see) I can't use Guice to solve his problem, because the
> Guice API is too simple for me. But please write, if I am wrong.
>
> Thanks
> m.
>
>
> On Mon, Sep 1, 2008 at 10:11 AM, Simone Tripodi
> <[EMAIL PROTECTED]> wrote:
>>
>> Hi Elek,
>> as Robbie suggested you - and reading oldest posts here in the group
>> you can understand that Robbie always knows the best solution - if you
>> choice the second way (and you still need help) I've prepared for you
>> the implementation you need:
>>
>>
>> public class PersistenceContextImpl implements PersistenceContext {
>>
>> private String unitName;
>>
>> public PersistenceContextImpl(String unitName) {
>> this.unitName = unitName;
>> }
>>
>> public Class<? extends Annotation> annotationType() {
>> return PersistenceContext.class;
>> }
>>
>> @Override
>> public boolean equals(Object obj) {
>> if (this == obj) {
>> return true;
>> }
>>
>> if ((obj == null) || (obj.getClass() != PersistenceContext.class)) {
>> return false;
>> }
>>
>> PersistenceContext other = (PersistenceContext) obj;
>> return unitName.equals(other.unitName());
>> }
>>
>> @Override
>> public int hashCode() {
>> return (127 * "unitName".hashCode() ^ unitName.hashCode());
>> }
>>
>> public String unitName() {
>> return unitName;
>> }
>>
>> }
>>
>>
>> Now you're able to bind EntityManager in this way:
>>
>> binder.bind(EntityManager.class).annotatedWith(new
>> PersistenceContextImpl("Test1PU")).toProvider(new
>> EntityManagerProvider(directory1));
>>
>> binder.bind(EntityManager.class).annotatedWith(new
>> PersistenceContextImpl("Test2PU")).toProvider(new
>> EntityManagerProvider(directory2));
>>
>> I hope this helps!
>> Best regards,
>> Simone
>>
>> 2008/8/31 Robbie Vanbrabant <[EMAIL PROTECTED]>:
>>> The easy answer: consider using Warp Persist (http://www.wideplay.com) for
>>> guicy persistence. Although support for multiple persistence units is not
>>> implemented in 1.0, we have have experimental support for it in the trunk.
>>> If you depend on that functionality let me know and we will help you get
>>> started.
>>>
>>> The other answer would be yes, you can do that. Have a look at how Guice
>>> implements Names.named(...). You basically have to bind to annotation
>>> instances instead of types, and you do that by subclassing the annotation
>>> and binding to an instance of that subclass.
>>>
>>> Hope this helps,
>>> Robbie
>>>
>>> On Sun, Aug 31, 2008 at 6:59 PM, elek <[EMAIL PROTECTED]> wrote:
>>>>
>>>> Hi,
>>>>
>>>> Is there any way to inject dynamic values to a class according to the
>>>> annotation parameters with Guice?
>>>> Eg.: I have the following fields in a class:
>>>>
>>>> @PersistenceContext(unitName="Test1PU")
>>>> EntityManager em1;
>>>>
>>>> @PersistenceContext(unitName="Test2PU")
>>>> EntityManager em2;
>>>>
>>>> An I would like to inject different EntityManager instances.
>>>> Unfortunately I can't access the annotation or the original Field over
>>>> the the Provider interface:
>>>>
>>>>
>>>> binder.bind(EntityManager.class).annotatedWith(PersistenceContext.class).toProvider(new
>>>> EntityManagerProvider(directory, ???unitName value???));
>>>>
>>>> Is there any solution for it?
>>>>
>>>> Thanks:
>>>> m.
>>>>
>>>
>>>
>>> >
>>>
>>
>>
>>
>> --
>> My LinkedIn profile: http://www.linkedin.com/in/simonetripodi
>> My GoogleCode profile: http://code.google.com/u/simone.tripodi/
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>>
>> >
>>
>
> >
>
--
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