Re: [dali-dev] Re: help with Dali 2.0 model migration - how do I now get

[Karen Moore <karen.moore@xxxxxxxxxx>]

Tom,

I think you should take a look at JpaProject.Updater and the Synchronous 
and Asynchronous implementations.  For UI development we are using the 
Asynchronous updater, but since you are doing internal modifications I 
believe you are going to want the synchronous updater so that when you 
make context model changes the project is updated before you continue 
making changes. 

Also, the code I gave you looks at PersistenceUnit.classRefs() which 
includes both specifiedClassRefs (those listed directly in the 
persistence.xml) and impliedClassRefs (those not listed, but that are 
defaulted in based on your JpaProject 'discovers annotated classes' 
setting). This is a pardigm we've have followed throughout our context 
model.  I would imagine the problem is because the project Update thread 
is not completed yet.  The update will run, updating our context model 
from the underlying resources and settings defaults based on other 
settings in the model.  Any change that occurs will cause another run of 
the update job to be queued up (actually, it will run again once it is 
finished based on whether any changes have occurred, not for every 
change that occurs).  So, if you used the synchronous project updater, 
you will not have to worry about there being a separate update thread. 
In our tests we use the synchronous project updater. 

I believe this will also solve some of the bugs you have just entered 
this afternoon.

Hope this helps!

Karen


Tom Mutdosch wrote:

> Hi Karen,
>
> I tried the getEntities() code snippet that you had sent me, and it 
> works mostly but does not do exactly what I expected.  That seems to 
> only retrieve entities that are listed directly in the persistence.xml 
> file, and not annotated Java entities that aren't explicitly listed.  
> We actually discovered this due to an apparent timing bug where 
> immediately after the Generate Entities wizard was run we called our 
> getEntities() method and it was not returning the new entity classes.  
> (Aside:  it looks like there's a separate timing issue here where the 
> entities were not yet updated in the persistence.xml; Is the 
> synchronizeClasses run as a separate Job after GenerateEntities?)
>
> In any case, is there a way to do a similar getEntities() call that 
> gets entities from the Dali model whether they are listed in the 
> persistence.xml or not?  It looks like calling 
> jpaProject.annotatedClasses() returns all of the entities as ITypes, 
> so it seems they are stored in the model somehow - I'm just not sure 
> how to appropriately get all of the PersistentTypes.
>
> Thanks
> Tom
>
>
> Karen Moore wrote:
>
> > I agree, the code to get a list of entities is a bit convoluted and 
> > difficult to find.  We've had other adopters ask us for this as well, 
> > so documentation on the existing API or helper API is the way to go.  
> > Thanks for your feedback!
> >
> > Karen
> >
> > Tom Mutdosch wrote:
> >
> > > Hi Karen,
> > >
> > > Thanks for the details; I definitely understand all the complexities 
> > > in providing various API to suit every possible need.  I have no 
> > > problem writing a getEntities() method myself.  The main reason I 
> > > suggested it was that it wasn't totally obvious how to do that using 
> > > the existing APIs.  I figured others might have the same 
> > > difficulties, so a new API call could address that.  But having 
> > > documentation or examples of how to do some of these common 
> > > operations would probably help achieve the same effect, so maybe 
> > > it's not a big deal.
> > >
> > > Regarding saving the OrmXML and PersistenceXML models, thanks for 
> > > the code snippets - that's what I was looking for.  I opened an 
> > > enhancement request with my particular usecase: 
> > > https://bugs.eclipse.org/bugs/show_bug.cgi?id=223197
> > >
> > > Thanks again,
> > > Tom
> > > _______________________________________________
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> >
> >
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