[sldev] Regarding VWR-2427, expanding obj. inventory within agent inventroy

[kelly at lindenlab.com]

Unfortunately the design of SL makes this kind of feature rather
difficult, and especially more difficult as a viewer-only project.

Agent inventory is conceptually a set of links or shortcuts to assets
(objects, sounds, textures etc).  When you manipulate agent inventory data
is updated in a database, but the actual assets don't change.

Assets on the other hand are *static files* that live on a (fancy, high
performance) http server.  This includes 'objects' which live in LLSD xml
format, including references to any inventory contents on them (and script
state and lots more).

When you rez an item the asset is fetched from the asset servers,
deserialized and instantiated in world.  Objects in world are *not*
assets, they are objects.  When you manipulate an object (or its
inventory) in world, it is the in memory version of that object that is
changing on the simulator.  When you take the object (or when it gets
de-rezed back to inventory for any reason) then the object is serialized
and saved as a new asset.

With the way the system currently is, modifying an object (whether in
inventory or not) requires:
* An http fetch of the asset linked to by the inventory item
* Deserialization of that asset into memory
* Viewing and/or modification of the object
* Serialization of the newly modified object
* An http PUT to write a new asset
* Updating the inventory item references.

That is, I think, a lot of work.  And a whole lot more, if it is possible
at all, to get similar behavior with a viewer only project.

 - Kelly



> Hello all,
>
> I'm looking for a fun hobby project, and improving the SL client
> would help this humble Java programer stay current on his C++ skills.
>
> I've been wishing for something along the lines of the feature
> requested in VWR-2427 (https://jira.secondlife.com/browse/VWR-2427)
> for quite some time. Specifically, I was hoping to enable the editing
> of an object's inventory without rezzing that object.
>
> Unfortunately, a cursory perusal of message_template.msg seems to
> indicate that the only messages that allow manipulation of an
> object's inventory are viewer->sim messages that require a rezzed
> object. Is my little project dead on arrival? Are there no messages
> that can be used to manipulate inventory based on an agent and item Id?
>
> Thanks,
> -P. Spoonhammer
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