[Glass] Garbage Collection of indexes

[Dale Henrichs via Glass]

On Wed, Oct 29, 2014 at 1:25 PM, Mariano Martinez Peck <
marianopeck at gmail.com> wrote:

>
>
>
> On Wed, Oct 29, 2014 at 1:47 PM, Dale Henrichs <
> dale.henrichs at gemtalksystems.com> wrote:
>
>>
>>
>> On Wed, Oct 29, 2014 at 6:31 AM, Mariano Martinez Peck via Glass <
>> glass at lists.gemtalksystems.com> wrote:
>>
>>> Hi folks,
>>>
>>> The GemStone Programming Guide says about indexes:
>>>
>>> "After creating indexes on a collection, be sure to remove these indexes
>>> before dereferencing the collection. Otherwise, the index will remain
>>> and prevent the collection and indexing structures from being garbage
>>> collected."
>>>
>>> Is this still being true? Or latest GemStone do this automatically?
>>>
>>
>> This is still true ... we are considering doing something about this in
>> 3.3, but nothing firm yet...
>>
>
>
> ouch...ok.
>
>
>
>>
>>>
>>> Also.... say I have 'collection1' which is a RcIdentityBug with the
>>> "old" list of my objects. And now I have 'collection2' which is another
>>> RcIdentityBad with the "new" list. Is there an automatic way to get the
>>> indexes from 'collection1' and apply them to 'collection2'?
>>>
>>
>> If you are using 3.2, the answer would be "yes, use the following":
>>
>>    indexSpec := collection1  indexSpec.
>>    indexSpec createIndexesOn: collection2.
>>
>>
> sweet!
>
>
>> Prior to 3.2 it's not very convenient ... the closest you can get is by
>> using the messages:
>>
>>    equalityIndexedPathsAndConstraints
>>    identityIndexedPaths
>>
>> to get the raw information from a collection and then fabricating the
>> appropriate index creation message ...
>>
>>
> OK, thanks for the explanation.
>
> Last question..is it ok to assume that #createIdentityIndexOn: will NOT
> recreate the index if it already exist? I followed the code and I
> understood that, but just wanted to be sure... so it's not a big deal if I
> try to recreate an index that already exist, correct?
>

Yes, it is safe to run index creation for the same index on the same
collection multiple times ...

Dale
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.gemtalksystems.com/mailman/private/glass/attachments/20141029/f616f32c/attachment.html>