why all the complexity of ldm inside idataprovider, why not just:
class mydataprovider implements idataprovider {
private long applicantid;
private transient applicant applicant;
private applicant getapplicant() { if (applicant==null) {
applicant=dao.get(applicantid); }}
private iterator(..) {
return getapplicant().getapplications();
}
private size() { return getapplicant().getapplications().size(); }
private void detach() { applicant=null; }
}
-igor
On Mon, Apr 19, 2010 at 7:42 AM, Steve Hiller <sh...@bellsouth.net> wrote:
> Hi All,
>
> I need help with a Wicket architecture design issue that I am having.
>
> In previous Wicket applications, I have used the LoadableDetachableModel in 2
> separate ways:
>
> 1) In the constructor of a WebPage, an LDM is instantiated and then used as
> the model
> for a component such as a ListView. This is staight out of "Wicket In Action"
> Chapter 4
> on LDMs.
>
> 2) As the model for a SortableDataProvider to be used with a DataView
> component.
> I have more or less used the WicketStuff SortingPage example as a guide. That
> is,
> the SortableDataProvider uses an LDM to supply its own backing data.
>
> For a new Wicket application, I have a WebPage that will have the following
> aspects:
>
> 1) A sortable grid based on the DataView component.
> 2) The data behind the grid is a collection of "Job Application" objects that
> is owned by an "Applicant" object.
> 3) A link somewhere else on the page will cause a new Job Application object
> to be added to the Applicant's list.
> 4) Adding the Job Application object will cause a new record to be written to
> the underlying database.
>
> Hibernate will be used as the persistence framework.
>
> So here is my issue:
> For this new application, is the correct approach to:
>
> 1) create an LDM in the WebPage's constructor that loads the Applicant object,
> 2) pass the Applicant object's collection of Job Applications objects to the
> SortableDataProvider
> that is used with the DataView component?
>
> Or should the SortableDataProvider use its own LDM that is separate from the
> one used on the WebPage?
>
> Thanks in advance,
> Steve
>
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