I am not storing state, I am storing configuration data.
So the idea is on Application startup, config data is read from the database
and stored in a HashMap of a singleton service.
-------- Original-Nachricht --------
> Datum: Wed, 4 Feb 2009 16:40:47 -0500
> Von: Christian Edward Gruber <christianedwardgru...@gmail.com>
> An: "Tapestry users" <users@tapestry.apache.org>
> Betreff: Re: Singleton Service behaves like a Per-Thread service
> Not sure, but you're probably doing yourself a disservice by storing
> state in a singleton. For instance, you have to guard against race
> conditions and so forth. It's doable, but you might want to use a
> transparent cache instead that does a lot of that sort of thing for
> you, and then have the hibernate query just resolve from cache. Not a
> hard rule, but often helpful.
>
> Christian.
>
> On 4-Feb-09, at 16:32 , superoverdr...@gmx.de wrote:
>
> > Hello everyone!
> >
> > I am a bit confused. I thought the default service binding is a
> > singleton?
> >
> > But why do I see a database query every time I load the same page?
> >
> > public class DomainPropertyService {
> >
> > private Session session;
> >
> > private List<Domain> domains = null;
> >
> >
> > public DomainPropertyService(Session session){
> > this.session=session;
> > }
> >
> >
> > public String getString(String key){
> >
> > if (domains==null){
> > domains = session.createCriteria(Domain.class).list();
> > }
> >
> > if (domains!=null){
> > return "queries the database";
> > }
> > else {
> > return "read from cache";
> > }
> >
> > }
> > }
> >
> >
> > public static void bind(ServiceBinder binder)
> > {
> >
> > binder.bind(DomainPropertyService.class);
> >
> > }
> >
> > Thanks!
> >
> > Toby
> >
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> >
>
> Christian Edward Gruber
> christianedwardgru...@gmail.com
>
>
>
>
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