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[kent-and@xxxxxxxxx]

> I've implemented the new signature interpretation behaviour in
> import_module, but not checked in since build_module isn't quite
> updated yet. Will fix tomorrow morning.
>
> The new behaviour is as follows:
>
>   module = import_module(my_module_id[, my_cache_dir])
>
> where my_module_id can be:
> - a non-string hashable object with a .signature() function that
> returns a string
> - a string
>
> If mid = my_module_id is a non-string the memory cache is checked (a
> hashmap lookup).
> If not found the .signature() function is called upon: mid =
> mid.signature().
>
> One way or another, now we have a string mid. Check if this is in the
> memory cache.
>
> If mid is not a valid filename of less than 100 chars (this can be
> adjusted but should be constant),
> set mid = modulename_from_checksum(compute_checksum(mid)).
> Check if this is in the memory cache.
>
> One way or another, now we have a string mid that is a valid filename.
> This is our module name.
>
> Look for the module with name mid on disk in the current directory.
> Look for the module with name mid on disk in the cache directory.
>
> Cache miss.
>
>
> Each time mid is changed, it is appended to a list of all previous module
> ids.
> When a module is found on disk and imported, it is added to the memory
> cache
> with each module id used.
>
>
> Are everybody happy with this?
>
> --
> Martin

I'm happy.

Kent