[Glass] Usage of OOP - when is it stable ?

[Jon Paynter via Glass]

Oop value is great for quick lookups - but remember they can be re-used
after the garbage collector runs.  So be sure to factor that into your
design if you store the values outside Gemstone

On Sat, Feb 10, 2018 at 10:03 AM, Marten Feldtmann via Glass <
glass at lists.gemtalksystems.com> wrote:

> Thanks, so its stable for my purposes ...
>
>
> Marten
>
> Norm Green via Glass <glass at lists.gemtalksystems.com> hat am 10. Februar
> 2018 um 18:29 geschrieben:
>
> The oop is stable from the time it is committed to the database (anObj
> isCommitted == true) up until the time the object is no longer referenced
> and is collected by the garbage collector.  Using the oop as a reference is
> safe to do so long as you understand these limitations.
>
>
> On 2/10/2018 3:48 AM, Marten Feldtmann via Glass wrote:
>
> Hello,
>
> we do our development in Gemstone totally via APIs.
>
> So the developer in general transfers ids of objects with the API calls
> with additional informations (e.g. additional ids for a lookup path) so the
> lookup can be done in a mangeable time frame (with each API call). The
> lookup path also gives an indication, if the api-user still has a valid
> view in its client.
>
> The lookup is still time consuming and I would like to consider using the
> numerical oop numbers for references. But I do not understand fully the
> constraints of these oop.
>
> The oop should be stable under certain circumstances:
>
> * as long as the object lives it has the same oop (not changed by GC)
>
> * within different concurrent running sessions (gem), an object alwas has
> the same returned oop (????????????????)
>
> * if the objects is not referenced any more, the oop may be reused
>
> * I lookup the object via the oop number and always do additional checks
> to see, if the object is the expected one (expected class, associations to
> other object)
>
> So my question - is the oop useable for that ? The documentation says,
> that the oop is not a reference. Or are there any other IDs available for
> that ?
>
> The purpose is to get a very fast access to objects in the database -
> without any additional large sets and indices included.
>
>
> Marten
>
>
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