[Borges-users] more on caching

[Eric Hodel]

??????? ???????? (slepnev_v at rambler.ru) wrote:

> Hi,
> 
> 1) I'm attaching my LRUCache.
> 
> 2) Why doesn't Borges use WeakRef from standard Ruby? Things would be 
> easier. Will try to look into that.

WeakRef doesn't do what I need it to do.  I've stolen the guts of
WeakRef for use in Weak::Key.

Here's how Borges::StateRegistry is supposed to work:

Register object X with key N.

When key N goes out of scope, remove object X from the registry.

In order for key N to go out of scope, it must be weakly held.

In order for key N to remove object X from the registry, it must know
where the registry lives.

Its easier to steal the guts of WeakRef than to try to extend it,
since the finalizer must be rewritten to support removing objects from
the registry.

-- 
Eric Hodel - drbrain at segment7.net - http://segment7.net
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