[Zero-install-devel] Refactoring: Solver

[Thomas L. <ta...@gm...>]

The next part of the refactoring work is now done. I've created a
Solver class with just the logic for picking versions.

Originally, this is what Policy was for, but it ended up handling all kinds of
other things (e.g. it would start a download if a feed was missing or stale).

The new solver also takes in the architecture and iface_cache objects explicitly
rather than finding the singletons itself, so you can (for example)
ask it what packages you'd need to run if you were on a PPC machine.

The changes are on the "master" branch:

 git://repo.or.cz/zeroinstall.git master

The Policy object now uses Solver internally to keep the old behaviour, i.e.

1) solve
2) check each of the feeds used by the solver, downloading any that
are missing or out-of-date
3) run solve again as each one arrives

This should also make it easier to plug in new solvers.


-- 
Dr Thomas Leonard		http://rox.sourceforge.net
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