[news.eclipse.rt.eclipselink] Re: DAO implementation: static?singleton?o

[Enrico <enrico.balatti@xxxxxxxxx>]

Hi Tim,

thank you for your reply.
I also implement DAO using generics. I have a BaseDAO <T> and many DAO 
that extend teh BaseDAO defining the Entity class they work on.
My question is related to more on performance and/or control 
(synchronization), when JPA is used also on my "public" pages (I mean to 
serve http client request). Can be a static or singleton DAO a 
bottleneck for many request?Is it better to create  a new DAO instance 
to serve any request?

BR,
Enrico

Tim Hollosy ha scritto:
> I use a single DAO for all my CRUD, then I don't have to implement the 
> DAO each time.
>
> It has methods that are templated like this:
>
>
>  public <T extends AbstractEntity> List<T> selectAll(Class<T> clazz) {
>                     return (List<T>) 
> JpaHelper.getEntityManager(entityManager).createQuery(null,clazz).getResultList() 
>
>        }