Re: [dali-dev] Listening for Entity Generation operations

[Karen Moore <karen.moore@xxxxxxxxxx>]

Hi Tom,

It seems that what you (and probably Chris as well) really want to do is 
to run the wizard and the entity generation operation yourself.  In the 
generic platform we call 
org.eclipse.jpt.ui.internal.generic.EntitiesGenerator.generate(IJpaProject,  
IStructuredSelection).  In here we run the GenerateEntitiesWizard and 
then schedule the WorkspaceJob that generates the entities and 
synchronizes the persistence.xml classes.  You should probably be using 
PackageGenerator.generateEntities() which takes an IProgressMonitor.  I 
would assume that you would copy a lot of the code in EntitiesGenerator 
and change how the Job is run.  Then you would be able to hook in at the 
right moment to do your post-processing, probably before the 
persistence.xml SynchronizeClassesJob is run. Look at the code in 
EntitiesGenerator.GenerateEntitiesRunnable.runInWorkspace(IProgressMonitor).  
I would expect your code to come after the call to 
PackageGenerator.generatesEntities().

The most likely candidate for public API here is 
PackageGenerator.generateEntities(Config, EntityGenerator.Config, 
Collection<Table>, OverwriteConfirmer, IProgressMonitor).   Does this 
sound reasonable?

Karen

Tom Mutdosch wrote:

> Hi Karen,
>
> Is the entire Entity Generation wizard run in a WorkspaceJob, or just 
> the EntityGeneration operition?  Basically we want to run the 
> EntityGeneration wizard and operation atomically.  Is this how it 
> works currently?  So if we launch the Dali wizard; when would we 
> launch our Job (which would essentially be emulating a join()..)?  Are 
> we able to do this in a postOperation after the EntityGeneration 
> operation runs?  Using a Job in this fashion seems a bit hacky; is 
> there some way we could instead pass our own ProgressMonitor to the 
> operation or something along those lines instead?
>
> I'm wondering if always running the Entity Generation in the 
> background could be problematic.  It is probably fine in the current 
> use-case scenarios, but could fail in cases like ours where we need to 
> generate an entity before proceeding, or maybe you wanted to perform 
> refactoring to make a composite key out of an entity (which would 
> create the separate EmbeddableID class, which you would probably want 
> to show in the model immediately).  Could there be some way to 
> programatically set a switch to have the operation run in the 
> background or foreground?  This seems to be a common pattern for these 
> types of generation.
>
> Thanks
> Tom
>
> > ------------------------------
> >
> > Message: 2
> > Date: Tue, 04 Sep 2007 10:30:48 -0400
> > From: Karen Moore <karen.moore@xxxxxxxxxx>
> > Subject: Re: [dali-dev] Listening for Entity Generation operations
> > To: "General Dali EJB ORM developer discussion."
> > 	<dali-dev@xxxxxxxxxxx>
> > Message-ID: <46DD6C18.1080901@xxxxxxxxxx>
> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >
> > Hi Chris,
> >
> > We changed entity generation to use a WorkspaceJob instead of a 
> > IWorkspaceRunnable so that we could make it run in the background 
> > instead of locking up the UI. The Job has the IProject as a scheduling 
> > rule since anything in the project can change.  You could set up a Job 
> > as well for the population of your table that also has a scheduling rule 
> > of IProject.  Then your Job will not run until our entity generation Job 
> > has completed.  Hope this helps.
> >
> > Karen
> >
> > Christopher Jaun wrote:
> >
> >  
> >
> > > Hello,
> > >
> > > Is there a way I can listen for newly generated entities?
> > >
> > > I see as a result of this change 
> > > (https://bugs.eclipse.org/bugs/show_bug.cgi?id=181816) in the 
> > > maintenance stream that entities are now generated in the background 
> > > when created with your wizard.
> > >
> > > I have a wizard containing a button that allows a user to launch your 
> > > entity wizard and when that returns I populate a table with the newly 
> > > created entities. Now that these are being generated in the background 
> > > I need a way to know when all the entity generation operations are 
> > > complete or at least be notified every time a new entity is created so 
> > > I can add it to my table.
> > >
> > > Is there a way to do this?
> > >
> > > Thanks,
> > > Chris
> > >
> > > ------------------------------------------------------------------------
> > >
> > > _______________________________________________
> > > dali-dev mailing list
> > > dali-dev@xxxxxxxxxxx
> > > https://dev.eclipse.org/mailman/listinfo/dali-dev
> > >
> > >
> > >    
> >
> >
> > ------------------------------
> >
> > _______________________________________________
> > dali-dev mailing list
> > dali-dev@xxxxxxxxxxx
> > https://dev.eclipse.org/mailman/listinfo/dali-dev
> >
> >
> > End of dali-dev Digest, Vol 24, Issue 1
> > ***************************************
> >
> >  
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> dali-dev mailing list
> dali-dev@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/dali-dev
>