Bin,
What if you create a provider to the session and then bind the real
implementation that will be accessed through the Session interface using
some Guice module. You can use either a provider:
public class SessionProvider implements Provider<Session> {
private final Connection connection;
@Inject
public SessionProvider(Connection connection) {
this.connection = connection;
}
public Session get() {
Session session = new HibernateSession(); // You can either keep
some sessions cached, use criativity! :P
session.setConnection(connection);
return session;
}
}
Then you do in your Guice module:
public class SomeModule extends AbstractModule {
@Override
protected void configure() {
bind(Session.class)
.toProvider(SessionProvider.class);
}
Then you inject like you've said: "@Inject Session session".
You can also use a @Provides annotation inside your Guice module:
public class SomeModule extends AbstractModule {
@Override
protected void configure() {
...
}
@Provides
Session provideSession() {
Session session = new HibernateSession();
... // You can inject in this method the connection or everything
you need and use as the same way of the provider!
return session;
}
}
Hope it help! :)
Atenciosamente,
*Jayr Motta*
Software Developer
*
*
I'm on
BlackBeltFactory.com<http://www.blackbeltfactory.com/ui#!User/jmotta/ref=jmotta>
!
On Thu, May 12, 2011 at 1:29 AM, Bin Wu <[email protected]> wrote:
> I think this answer is pretty much what I want. But I still got a question
> about the EntityManager. Can we inject a Session (Hibernate session) and how
> to do that? How the session can be managed? Or I am absolutely wrong?
>
> On 12 May 2011 13:41, ale <[email protected]> wrote:
>
>> ------------ CLIENT SIDE ------------
>>
>> class View {
>> uiBinder()....
>> }
>>
>> class Presenter {
>> onbind() {
>> newUserButton() {
>> dispatch(new NewUserAction("name", "lastname"), ...);
>> }
>> }
>> }
>>
>
> *Clear*
>
>
>>
>> ------------ SERVER SIDE ------------
>>
>> class NewUserActionHandler {
>> private final UserService userService;
>>
>> @Inject
>> public NewUserActionHandler(UserService userService) {
>> this.userService = userService;
>> }
>>
>> public NewUserResult execute(NewUserAction action, ...) {
>> this.userService.createNewUser(action.getName(),
>> action.getLastName());
>> }
>> ...
>> }
>>
>
> *Clear*
>
>
>>
>> class UserService {
>> private final UserDao userDao;
>>
>> @Inject
>> UserService(UserDao userDao) {
>> this.userDao = userDao;
>> }
>>
>> Long createNewUser(String name, String lastName) {
>> return userDao.storeUser( new User(name, lastName));
>> }
>>
>> }
>>
>
> *Clear*
>
>
>>
>> class UserDao {
>> private final Provider<EntityManager> em;
>>
>> @Inject
>> public UserDao(Provider<EntityManager> em) {
>> this.em = em;
>> }
>>
>> public Long storeUser(User user) {
>> this.em.get().persist(user);
>> return user.getId();
>> }
>> }
>>
>
> I do not understand this one here. Suppose my UserDao inherited from a
> GenericDao. So the inherited store method looks like
>
> ...
> public T store (T entity) {
> getSession().saveOrUpdate(entity);
> return entity.getId();
> }
> ...
> protected Session getSession() {
> return this.session
> }
>
> protected void setSession(Session s) {
> this.session = s;
> }
> ...
>
> also the UserDao's constructor will be looks like
>
> @Inject
> public UserDao(Session s) {
> setSession(s);
> }
>
> Sorry I am really confused, and I may absolutely wrong. I am wondering here
> how the session could be correctly injected/managed if this is feasible.
>
> Thanks.
>
>
>>
>> On May 10, 4:02 am, Bin Wu <[email protected]> wrote:
>> > Hello everyone,
>> >
>> > I am pretty new to Guice and even J2EE, and I am currently trying to
>> build a
>> > webapp which ues (GWT, Google-gin, gwt-platform, Guice, Hibernate etc.).
>> My
>> > problem here is, at the server side, I am bit confused about how those
>> > components can collaborate with each other in a good manner. Anyone
>> here
>> > has a good example which uses Guice, Hibernate and a DAO layer?
>> >
>> > Thanks a lot.
>>
>> --
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>>
>>
>
>
> --
> Regards,
>
> Bin Wu | *BluePoint *| 03 9296 5100 | 0423 710 288 | *www.bluepoint.net.au
> * <http://www.bluepoint.net.au/>
>
>
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