Hi Dan!
Thank you very much for your reply.
I've simplified as much as I could and changed the latest quickstart ToDoItem
something similar of what I really want to do:
The idea:
A ToDoItem might have associated with it an execution plan with tasks. The plan
is something like
go somewhere
do that
go somewhere else
and do something else
Several execution plans are generated and the user should select one to
fullfill the ToDoItem. For 'Buy Milk' it could be
(1) - Go to the supermarket
get some milk
pay for the milk
go home
(2) - Go to the farm
milk a cow
pay the farmer
go home
etc. etc.
In short:
class ExecutionPlan{
List<ArrayList> getTasks();
}
class Task{
properties where and what
}
class ExecutionPlanService {
List<ExecutionPlan> getExecutionPlans(ToDoItem td);
}
class ToDoItem{
setExecutionPlan(executionPlan ep);
List<ExecutionPlan> choicesExecutionPlan(){
return executionPlanService.getExecutionPlans(this);
}
}
What I don't understand is how to acchieve this with isis. I installed an
ExecutionPlanService which is supposed to generate some alternative plans for a
ToDoItem. The method getExecutionPlans(ToDoItem td) is called many many times
but why? When selecting a plan from a drop down list (via
choicesExecutionPlan()) a plan may be selected. But clicking on the selected
plan then crashes the UI.
Do I have to persist the execution plan suggestions?`I only need one of them.
How do I get rid of the others then?
What am I missing? I've spent days with this and I don't get anywhere close to
a solution. :-(
A copy of the source code may be find here.
https://github.com/chris58/ToDoItemExecutionPlan.git
Any help very much appreciated
Christian
________________________________________
From: Dan Haywood [[email protected]]
Sent: Sunday, February 10, 2013 6:31 PM
To: users
Subject: RE: Presenting the user with alternatives to select one...
I'm guessing that the exception is being thrown in the domain object
somewhere but the viewer isn't handling it gracefully.
If you can raise a jira ticket describing the issue with a test case based
on your github report, and then I can use that to sort out the issue.
Dan
On 10 Feb 2013 11:31, "Christian Steinebach" <
[email protected]> wrote:
> Hi again,
>
> I simplified th getShortestPath to just generate some fake objects.
> A TransportPath is displayed with legs when only one TransportPath is added
> When adding several tp's the list is displayed in a table, but clicking on
> a title
> crashes the UI.
>
> public class ShortestPathService extends AbstractService {
>
> @Hidden
> public List<TransportPath> getShortestPaths(TransportDemand td) {
> List<TransportPath> l = new ArrayList<TransportPath>();
>
> // if j == 1, i.e. only one element in l, then it works
> // otherwise crash in shown table
>
> for (int j = 0; j < 2; j++) {
> TransportPath tp = newTransientInstance(TransportPath.class);
> for (int i = 0; i < 2; i++) {
> ShortLeg sl = newTransientInstance(ShortLeg.class);
> sl.setFrom("from " + i + j);
> sl.setTo("to " + i + j);
> persist(sl);
> tp.addLeg(sl);
> }
> persist(tp);
> l.add(tp);
> }
> return l;
> //return getShortestPaths(td.getPickup(), td.getDelivery());
> }
>
> The exception:
>
> [exec] ERROR - DefaultExceptionMapper - Unexpected error occurred
> [exec] org.apache.wicket.WicketRuntimeException: Can't instantiate
> page using constructor 'public
> org.apache.isis.viewer.wicket.ui.pages.entity.EntityPage(org.apache.wicket.request.mapper.parameter.PageParameters)'
> and argument 'pageType=[ENTITY], pageTitle=[from 00-to 00-to 10]'. Might be
> it doesn't exist, may be it is not visible (public).
> [exec] at
> org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:193)
> ....
> ...
> ...
> [exec] ... 40 more
> [exec] Caused by: java.lang.NullPointerException
> [exec] at java.util.regex.Matcher.getTextLength(Matcher.java:1140)
> [exec] at java.util.regex.Matcher.reset(Matcher.java:291)
>
> Christian
>
>
>
>
>
>
>
> ________________________________________
> From: Christian Steinebach [[email protected]]
> Sent: Sunday, February 10, 2013 11:38 AM
> To: [email protected]
> Subject: Presenting the user with alternatives to select one...
>
> Hi everybody!
>
> I'm working on a similar demo as DDDsample (didn't know about it until you
> started the discussion)
> I have a service installed which should produces a list of alternative
> transportation paths from a pickup
> to a delivery destination. One of the alternatives should be selected by
> the user.
> The chosen TransportationPath should then be added to a TransportDemand.
>
> class TransportPath[{
> List<ShortLeg> getLegs();
> ...
> }
> //for simplicity only to and from
> class ShortLeg{
> public String getFrom();
> public String getTo();
> }
>
> The ShortestPathService seems to work ok while generating
> TransportPaths with increasing 'costs'. When 'leaving' the service all
> legs are instantiated.
> Nothing needs to be persisted until the user has chosen an alternative.
>
> Now the questions:
>
> 1) While generating the paths I've used createTransientInstance() with
> persist and without persist afterwords.
> I've use new ...() as well to allocate both new paths and new ShortLegs.
>
> Whenever the transport paths end up in a table, the legs are gone, the
> list is empty.
> I've build up the title on the fly to check that the legs are originally
> added tot the transport path.
> And the title is reflecting all legs correctly, but still the added legs
> are gone.
> When clicking on one alternative, the viewer crashes.
>
> What am I doing wrong here? What would be the correct way of presenting
> unpersisted
> alternatives to a user where he can select the one.
>
> 2) Even when having a list of transport paths (althouhg only titles) where
> should I annotate with
> @Bulk to make it happen? I've tried several places (TransportDemand,
> TransportDemands)
> but to no success. Or isn't Bulk the right way to do it?
>
> I'm getting more and more confused and am obviously missing something
> important here.
>
> I've put the source on GitHub
> https://github.com/chris58/TPM.git
>
> Any help very much appriciated
> Christian
>
>
> I've tried the onaboat project to get some ideas, but when clicking on an
> 'Undefined Schedule' in Voyage
> it crashes too. :-(
>
>
>
>
>
