[Opensim-dev] Scope and Purpose of IApplicationPlugins and IRegionModules

[Dr Scofield]

liu xiaolu wrote:
> as I see,
> IApplicationPlugin is for extending the OpenSim.exe.
>   it is initialized after you execute the OpenSim.exe.
> IRegionModule is for extending the RegionServer.
>   it is initialized at the beginning of loading a region(sim).
and regions can be created dynamically.
>
> >Can we replace IRegionModules with IRegionPlugins and have PluginLoader
> >load them all?
>
> They are for different purposes, and loaded at different timing,
> Functionally, they can not be* converged.*
> But they are written in similar code style, if you want to give them 
> more meaningful
> names, and apply polymorphism to making the code easier to be understand,
> it is a good idea.
>
> lulurun,
> regards
>
> 2008/7/3 Ryan McDougall <sempuki1 at gmail.com <mailto:sempuki1 at gmail.com>>:
>
>     In my poking about the loading code to get an idea of the scale of the
>     problem. I asked before about I*Plugin v. I(Region)Module, but I don't
>     think there was much of a clear answer...
>
>     The reason I am asking again is that I noticed:
>
>     1. That a Scene takes a (Region)ModuleLoader as an argument to its
>     constructor. It doesn't appear to use this reference at all.
>
>     Is there a Scene that needs to load its own RegionModules? Or is
>     this an
>     example of bit-rotted code or inappropriate abstraction/coupling?
>
>     2. That LoadRegionsPlugin (an IApplicationPlugin) uses its
>     reference to
>     (Region)ModuleLoader (through OpenSimBase) to load RegionModules.
>
>     Without knowing the semantic difference between a Plugin and
>     Module, the
>     LoadRegionsPlugin looks a bit awkward. It appears as if its only
>     purpose
>     is to choose between RegionLoaderFileSystem and RegionLoaderWebServer,
>     then load them within a plugin...
>
>     Perhaps it might be more appropriate to make that selection in
>     OpenSimBase in order to keep all loading in one place?
>
>     There are many ways I could do that, but it would take
>     understanding the
>     purpose of the current and future design in order to make my plugin
>     loader a true solution that accommodates all use-cases.
>
>     Can we replace IRegionModules with IRegionPlugins and have
>     PluginLoader
>     load them all?
>
>     Cheers,
>
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>
>
>
> -- 
> Lulurun
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>
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-- 
dr dirk husemann ---- virtual worlds research ---- ibm zurich research lab
SL: dr scofield ---- drscofield at xyzzyxyzzy.net ---- http://xyzzyxyzzy.net/
RL: hud at zurich.ibm.com - +41 44 724 8573 - http://www.zurich.ibm.com/~hud/