Re: [hibernate-dev] HHH-10478 : OperationContext

Hi Steve, I can start integrating this code into your wip/6.0 branch. Are there any fundamental changes you would like to see before I integrate, or should I integrate as is? Thanks, Gail On Fri, Apr 1, 2016 at 12:14 PM, Steve Ebersole <steve(a)hibernate.org&gt; wrote: > I do like the proposal. Awesome job on the gist. I'll look over the > code over the next few days. > > On Thu, Mar 31, 2016 at 3:05 PM Gail Badner <gbadner(a)redhat.com&gt; wrote: > >> Replying for consideration for 6.0. >> >> On Mon, Feb 8, 2016 at 6:12 AM, Steve Ebersole <steve(a)hibernate.org&gt; >> wrote: >> >>> This is going to have to wait post-5.1 as I mentioned earlier if this >>> was not ready prior to last week. >>> >>> I have just too much on my plate to look at this over 2 days. >>> >>> On Mon, Feb 8, 2016 at 12:29 AM Gail Badner <gbadner(a)redhat.com&gt; wrote: >>> >>>> The POC [1] assumes that we only need a single OperationContext for >>>> each >>>> type of operation. OperationContextManager has a Map of >>>> OperationContext by >>>> OperationContextType. Each OperationContext object is lazily created >>>> on the >>>> first occurence of the corresponding type of operation. >>>> >>>> Currently, when an operation is initiated (e.g., by Session.merge( >>>> entity >>>> )), OperationContextManager [2] does the following: >>>> - calls ManageableOperationContext#beforeOperation, which puts the >>>> OperationContext "in progress"; >>>> - executes the operation, which performs cascades according to >>>> mappings; >>>> - calls ManageableOperationContext#afterOperation, which puts the >>>> OperationContext in an invalid state that is "not in progress". >>>> >>>> When an operation cascades to other entities, the same >>>> OperationContext is >>>> used. >>>> >>>> Obviously, OperationContextManager needs to know if an operation is >>>> "top-level" (meaning that the operation is on the original entity, and >>>> not >>>> cascaded). In the POC, if the relevant OperationContext is not in >>>> progress >>>> at the time that an opeation is initiated, then OperationContextManager >>>> assumes that the operation is top-level. If the OperationContext is "in >>>> progress", then OperationContextManager assumes that this is a cascaded >>>> operation. >>>> >>>> I am not sure this is always correct. Can anyone think of a case where >>>> this >>>> could break down? >>>> >>>> In the POC, the following EventSource methods that contain an argument >>>> for >>>> the operation cache has been deprecated and is no longer used because >>>> the >>>> contents of that argument has been moved into an OperationContext: >>>> >>>> public void merge(String entityName, Object object, Map copiedAlready) >>>> public void persist(String entityName, Object object, Map >>>> createdAlready) >>>> public void persistOnFlush(String entityName, Object object, Map >>>> copiedAlready) >>>> public void refresh(String entityName, Object object, Map >>>> refreshedAlready) >>>> public void delete(String entityName, Object child, boolean >>>> isCascadeDeleteEnabled, Set transientEntities) >>>> >>>> Before the POC, it was the above methods that indicated that it was not >>>> top-level. If it turns out that having a single OperationContext is not >>>> valid, then there needs to be some other way to determine if the >>>> operation >>>> was top-level. >>>> >>>> I had originally planned to use PersistenceContext#getCascadeLevel == >>>> 0 to >>>> indicate an operation was at the top-level, but I found that won't >>>> work for >>>> some operations. For example, the cascade level for a top-level delete >>>> can >>>> be > 1 when deleting orphans due to merge or save-or-update operations. >>>> Another example is that cascade level is not 0 on top-level >>>> save-or-update >>>> while flushing. >>>> >>>> I have some ideas to work around this, but I didn't want to get too far >>>> down that path if it wasn't an issue. >>>> >>>> Thanks, >>>> Gail >>>> >>>> [1] >>>> >>>> https://github.com/gbadner/hibernate-core/blob/3d0e2378cb998788b3205afb1e... >>>> [2] >>>> >>>> https://github.com/gbadner/hibernate-core/blob/3d0e2378cb998788b3205afb1e... >>>> >>>> >>>> On Fri, Feb 5, 2016 at 8:17 PM, Gail Badner <gbadner(a)redhat.com&gt; >>>> wrote: >>>> >>>> > I've created a gist with an overview of the design: >>>> > https://gist.github.com/gbadner/f0e635e8fba7b84af233 . I will add a >>>> new >>>> > section tomorrow about possible shortcomings. >>>> > >>>> > Here is my POC: >>>> > >>>> https://github.com/hibernate/hibernate-orm/compare/master...gbadner:HHH-1... >>>> > . Although no tests fail, the approach may be too simple to model >>>> what is >>>> > necessary. >>>> > >>>> > At this point the POC is squashed down to 1 commit: >>>> > >>>> https://github.com/hibernate/hibernate-orm/commit/3d0e2378cb998788b3205af... >>>> > >>>> > Have a look and feel free to comment. >>>> > >>>> > Thanks, >>>> > Gail >>>> > >>>> _______________________________________________ >>>> hibernate-dev mailing list >>>> hibernate-dev(a)lists.jboss.org >>>> https://lists.jboss.org/mailman/listinfo/hibernate-dev >>>> >>> >>