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From Michael Gentry <mgen...@masslight.net>
Subject Re: @SortWeight annotation
Date Wed, 13 Jul 2011 13:30:53 GMT
Hi Andrus,

We sometimes get this exception:

Sorting objects for [entity] failed. Cycles found.

This is obviously coming out of AshwoodEntitySorter.java.  Do you
think the annotation would help in that circumstance?  I'm just now
starting to investigate this and another graph issue we are having.

Thanks,

mrg


On Fri, Mar 25, 2011 at 3:48 AM, Andrus Adamchik <andrus@objectstyle.org> wrote:
> You can already override the sorter via DI (and create a chain yourself, decorated as
EntitySorter interface). The sorter has the same scope as Cayenne stack, although I guess
internal implementation can be done as dynamic strategy based on contextual parameters.
>
> Suggested annotation is a way to attach a per-entity piece of configuration that can
be used by the sorter. Due to the nature of the annotations it will also have a stack lifetime
scope.
>
> Andrus
>
>
> On Mar 25, 2011, at 1:03 AM, Aristedes Maniatis wrote:
>
>> How pluggable is the sorter? Could a user specify a different sorter for one particular
commit? Or for a whole context? Or chain the sorters so that Ashwood is used first and then
another sorter is used to adjust the results under particular circumstances?
>>
>>
>> Ari
>>
>> On 25/03/11 5:00 AM, Andrus Adamchik wrote:
>>> Here is an algorithm analysis task for graph-theory-minded folks. I came up with
the @SortWeight solution below for a very specific problem when commit operation ordering
can not be derived from the cross-entity relationships in the DataMap. Now I wondering how
many other cases raised on this list that are not addressed by the default AshwoodEntitySorter
can be solved by manually overriding entities ordering "weight"?
>>>
>>> Andrus
>>>
>>>
>>> On Mar 24, 2011, at 4:50 PM, Andrus Adamchik (JIRA) wrote:
>>>
>>>> cayenne-lifecycle: @SortWeight annotation
>>>> ------------------------------------------
>>>>
>>>>                Key: CAY-1553
>>>>                URL: https://issues.apache.org/jira/browse/CAY-1553
>>>>            Project: Cayenne
>>>>         Issue Type: Task
>>>>         Components: Lifecycle Extensions
>>>>   Affects Versions: 3.1M2
>>>>           Reporter: Andrus Adamchik
>>>>           Assignee: Andrus Adamchik
>>>>
>>>>
>>>> Sometimes it is useful to manually override the operation ordering for some
entities. E.g. per CAY-1547 we support UuidRelationships, but saving an object with a UuidRelationship
to another object does not generate correct ordering. So we may want to override default ordering
for entities annotated with @UuidRelationship. E.g.:
>>>>
>>>> @SortWeight(1.1)
>>>> @UuidRelationship("UUID")
>>>> class My extends _My {}
>>>>
>>>> Note that this approach will not be able to address all shortcomings of a
generic AshwoodEntitySorter. It is somewhat of a hack. So it will be placed in cayenne-lifecycle
and treated as an "extension".
>>>>
>>>> --
>>>> This message is automatically generated by JIRA.
>>>> For more information on JIRA, see: http://www.atlassian.com/software/jira
>>>>
>>>
>>
>> --
>> -------------------------->
>> Aristedes Maniatis
>> GPG fingerprint CBFB 84B4 738D 4E87 5E5C  5EFA EF6A 7D2E 3E49 102A
>>
>
>

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