[Opensim-dev] Local assets in Grid mode

[Teravus Ovares]

Regardless of how it gets done internally, it needs to be easy.    As
easy..  or easier then it already is.

Best Regards

Teravus


On 9/13/08, Stefan Andersson <stefan at tribalmedia.se> wrote:
>
>  Folks,
>
> It's been a long time ambition to streamline the services into something a
> bit more 'chainable'.
>
> All services should  be thought of, and implemented like, provider
> interfaces;
>
> it should not matter to the code if it IAssetProvider.GetAsset from
> something that reads directly, and un-cached, from disk, or from something
> that uses an in-memory IAssetProvider as a cache and uses its internal http
> proxying IAssetProvider to forward requests to a http service;
>
> On the http service end, The service should be implemented with the _exact_
> same family of concrete IAssetProvider implementations to fetch and serve
> the resources; this will lead to efficient code re-use and to build 'service
> chains' (think streams) will ease redirection and inclusion of multiple
> services on each chain step. IE, the 'grid asset service' could, in turn,
> re-route asset requests to yet another higher node, or to the asset service
> of another grid, using the exact same concrete implementations as the region
> server.
>
>
> For quite some time I've been pointing out that efficient asset fetching
> and caching will be different from one scenario to another. Chaining like
> this will accomodate the basest case, all to the inter-grid metaverse
> protocols.
>
> The same goes for all the other services (user/inventory/message/grid) as
> well; if we can harmonize and normalize the interfaces and implementations,
> we can start to build intelligent information routing chains - a big step
> towards intergrid experimentation.
>
> (In this scenario, the simplest scenario for a local implementation would
> be to instantiate a local file-based IAssetProvider directly instead of the
> cached proxy that would constitute the grid equivalent. What concrete class
> should be the asset provider(s) should be an ini setting, like any other
> module setting.)
>
> And, while we're on the topic; the asset fetching needs to go asynch; we
> can't have the lag of each step fetching the full asset before returning it
> to the next step.
>
> Best regards,
> Stefan Andersson
> Tribal Media AB
>
> Join the 3d web revolution : http://tribalnet.se/
>
>
>
> ------------------------------
> > Date: Sat, 13 Sep 2008 15:15:31 +0100
> > From: melanie at t-data.com
> > To: opensim-dev at lists.berlios.de
> > Subject: Re: [Opensim-dev] Local assets in Grid mode
> >
> > Yes. In the future it will be. But to get there at all, the first
> > logical step is to remove local asset mode. It was only a kludge,
> > left over because of legacy compatibility.
> > It has become a stumbling block now and needs to be relegated to the
> > junkyard of ancient code history.
> >
> > Melanie
> >
> >
> > James Hughes wrote:
> > > Melanie wrote:
> > >> What I propose is a multi-step process.
> > >>
> > >> 1. Remove the local assets flag and the code needed to use local
> > >> assets. At this time, local asset regions need to start a local
> > >> asset server and change their grid asset server to point to 127.0.0.1
> .
> > >>
> > >> 2. Refactor the asset loading system, providing a persistent local
> > >> asset cache and cleaner code paths.
> > >>
> > >> Up to here, there would be no functional changes.
> > >>
> > >> 3. Extend the interface to get a "asset search list", which will let
> > >> the region's avatars use grid assets even while in the local asset
> > >> region.
> > >>
> > >> Melanie
> > >>
> > >>
> > > As grids start to inter-connect the asset system will, probably, become
> > > very distributed. Maybe the Grid server will provide a service to
> > > automatically point Region servers to Asset servers that are trusted
> for
> > > the "local" grid. Then Regions could add others as needed in the
> > > configuration.
> > >
> > > Say a region on grid-a has a vendor in a rental space. The items to be
> > > sold are hosted on the Asset service for grid-b. And, I make my home on
> > > a region in grid-c. If I purchase the item, the Region on grid-a needs
> > > to point my Inventory service to the grid-b Asset service to make a
> > > reference to the item. And, possibly arrange a copy of the item to be
> > > transfered to my Asset service on grid-c. And, when I rez the item on
> my
> > > home grid, it could be pulled from my grid's Asset server, or possibly
> > > the grid-b Asset server.
> > >
> > > The Inventory service could also point to multiple Asset services to
> > > make the system redundant to provide a backup feature.
> > >
> > > BlueWall <j>
> > >
> > >
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> > >
> > >
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