a (more) general cache facility that is safe(r) memory-wise

[Martin Pool]

On 16 Jan 2006, Denys Duchier <duchier at ps.uni-sb.de> wrote:
> Here is a module that implements a cache class where values can be kept live for
> N major collections.  You create such a cache with:
> 
> 	cache = Cache(N)
> 
> you can add values to the cache as follows:
> 
> 	ref = cache.put(val)
> 
> cache.put(val) returns a "reference" to the value (like a weakref).  You can
> test whether the reference is still valid with:
> 
> 	ref.alive
> 
> in which case you can retrieve the cached value with:
> 
> 	ref.value

That looks like a nice interface and elegant implementation.  

I just wonder if major collections are really the best way to express
how long things should persist?  Would it perhaps be better to give a
limit on the number of objects retained in the cache?

-- 
Martin
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