On Tuesday, February 5, 2013 8:48:35 AM UTC+1, Manuel wrote:
>
> Hey,
>
> I had a look and used this to implement a servlet-module:
> http://code.google.com/p/google-guice/wiki/ServletModule
> My Module looks like the example from your session per request link:
> http://code.google.com/p/google-guice/wiki/JPA#Web_Environments_%28session-per-http-request%29
>
> In the web.xml I put a Listener.
> <listener>
>
> <listener-class>de.mash.project.shared.MyGuiceServletConfig</listener-class>
> </listener>
>
> The Listener looks like this:
> public class MyGuiceServletConfig extends GuiceServletContextListener {
>
> @Override
> protected Injector getInjector() {
> return Guice.createInjector(new MyServletModule());
> }
> }
>
> Then I added the following in my Worker Entity-class:
>
> //@RequestScoped
>
> @Entity
> @Table(name = "Worker")
> public class Worker {
>
> *@Transient
> @Inject static EntityManager em3;*
You don't want a single EntityManager for the whole app lifetime and shared
between threads, so you have to use a Provider<EntityManager> here.
>
>
> ...
>
> * @Transactional*
> public void persist() {...}
>
>
> *@Transactional*
> public static Worker findWorker(Long id) {...}
> }
>
I don't think Guice can intercept static methods, so you'd have to
explicitly begin/end a transaction here.
>
> I set a breakpoint on my doFilter() method in my PersistFilter, and its
> just doing what Jens descripted above.
>
>
>> EntityManager em = create(); //save this em instance somewhere so you can
>> access it in your RF service methods, e.g. using a static ThreadLocal
>> filterChain.doFilter() //this calls the RF servlet and does all the RF
>> requests
>> em.close() //Don't forget to cleanup the ThreadLocal if you have used one.
>>
> Instead of EntityManager, its called UnitOfWork
>
> I thought my WorkerEntity´s *em3 EntityManager* would now get injected
> but it doesnt :(
>
Static injection needs to be requested explicitly from your
module: https://code.google.com/p/google-guice/wiki/Injections#Static_Injections
>
> Im not sure if I´m totally wrong, or if just something small is
> missing/wrong.
>
Use a service (with a custom ServiceLocator that uses Guice, see
https://github.com/tbroyer/gwt-maven-archetypes/tree/master/guice-rf-activities/src/main/resources/archetype-resources/__rootArtifactId__-server/src/main/java
for
an example) instead of static methods in your entity; that way you'll
remove the need for static injection and @Transaction will Just Work™.
Beware that your service will be a "quasi-singleton" in RequestFactory
(singleton that can be garbage-collected under low-memory conditions and
recreated later when needed), so always inject Provider<>s.
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