Re: DataContext cleanup

From: Andrey Razumovsky (razumovsky.andre..mail.com)
Date: Tue Mar 10 2009 - 07:34:16 EDT

  • Next message: Νίκος Παράσχου: "How can I handle validation exception?"

    It should. No objects registered with the context are returned from your
    function, and context itself is registered in event mechanizms using weak
    references

    2009/3/10 Borut Bolina <borut.bolcin..mail.com>

    > Hi, just a sanity check:
    >
    > I have a this method in my PersistenceManager class:
    >
    > public Principal findPrincipalByUsername(String username) {
    > DataContext context = DataContext.createDataContext();
    > Expression e =
    > ExpressionFactory.matchExp(User.USERNAME_PROPERTY, username);
    > SelectQuery query = new SelectQuery(User.class, e);
    > List users = context.performQuery(query);
    >
    > User user = null;
    > Principal principal = null;
    > if (users.size() > 0) {
    > user = (User) users.get(0);
    > principal = new Principal();
    > principal.setUsername(user.getUsername());
    > Profile profile = user.getProfiles().get(0);
    > principal.setFirstName(profile.getFirstName());
    > principal.setLastName(profile.getLastName());
    > }
    >
    > return principal;
    > }
    >
    > Is DataContext (context) garbage collected?
    >
    > -Borut
    >
    >
    > 2007/4/10 Andrus Adamchik <andru..bjectstyle.org>:
    > > The context is garbage collected once the context itself and all its
    > objects
    > > go out of scope. So make sure you don't retain references to the objects
    > > registered in the context and you should be fine.
    > >
    > > Andrus
    > >
    > >
    > > On Apr 10, 2007, at 11:18 AM, Marc Gabriel-Willem wrote:
    > >>
    > >> Hi,
    > >>
    > >>
    > >>
    > >> In some situation, I'm creating a child data context.
    > >>
    > >> Is there a good way to clean-up that child data context properly (in
    > >> order to facilitate the JVM GC process) when I finished with it ?
    > >>
    > >>
    > >>
    > >> Thank you.
    > >>
    > >> Marc
    > >>
    > >
    > >
    >



    This archive was generated by hypermail 2.0.0 : Tue Mar 10 2009 - 07:35:39 EDT