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From "Xavier Hanin (JIRA)" <>
Subject [jira] Commented: (IVY-399) Flexible Cache Management
Date Sat, 06 Oct 2007 15:29:50 GMT


Xavier Hanin commented on IVY-399:

Thanks for pinging Robert, we know this is a very important issue for the user community,
and we consider it accordingly. OTOH, this issue is not easy to solve, and we have to find
enough time to be able to address it like it should. So all we can do is promise we'll do
our best... will it be enough is still the question :-)

> Flexible Cache Management
> -------------------------
>                 Key: IVY-399
>                 URL:
>             Project: Ivy
>          Issue Type: Improvement
>         Environment: ALL
>            Reporter: Eric Crahen
> Creating an issue at Xaviers request for improving the approach to cache management
> On 1/29/07, Xavier Hanin <> wrote:
>     Supporting this kind of graph
>     could be interesting, and what makes it difficult for Ivy is that Ivy
>     heavily relies on its cache mechanism, which makes it impossible to do
>     what you want (i.e. never put anything from your local repository to
>     the cache).
> This would be a very powerful feature to add. In 2.0, is there any reason for the cache
to have to be so baked into everything? In otherwords, why not implement every resolver and
all of the internal management w/ no caching what so ever baked in anywhere? Instead all caching
is done in a decorator fashion by wrapping a caching resolver around any other resolver? In
otherwords, the core of Ivy only knows about resolvers, no concept of cache exists in the
heart of Ivy.
> It seems to me this would be much more flexible, and it would still be very possible
to provide the syntactic sugar to make it very simple and even seemless to configure these
wrappers by default. At the same time, people who will use the flexibility have the power
to set up chains that might go something like.
> (logical chain)
>   localresolver
>   cacheresolver
>     httpresolver url="..."
>   cacheresolver
>     httpresolver url="..."
> There is no longer any need to have things like useLocal flags. Its already expressed
that the local resolver is not cached because its just not wrapped in a caching resolver.
> I think this idiom should be applied to both artifact and metadata resolution.
> One cool thing about this, is that in this way, since all caching is simply a type of
resolver we'd provide people who don't like the particular method we use to perform caching
in the resolver we provide are free to provide their own. This would address lots of the issues
that have been raised about caching, consistency, doing anything remotely fancy with local
resolvers - right now its very hard to address any of that because caching is not very plugable
as it stands.
> I think the only drawback is that it seems like its harder to configure out of the box
because most people by default would want to wrap every resolver with a cacheresolver - but
like I said, this is easily solvable by providing some simple syntactic sugar. For instance
the simplehttpresolver might be the name of an undecorated resolver for power users, and the
things named httpresolver would simple be an alias for the cacheresolver wrapped around the
simplehttpresolver (or subclass, whatever is the most sensible choice)

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