Eviction Policy in NSCache and NSDiscardableContent
Eviction Policy in NSCache and NSDiscardableContent
- Subject: Eviction Policy in NSCache and NSDiscardableContent
- From: Dalmazio Brisinda <email@hidden>
- Date: Wed, 02 Mar 2011 10:31:58 +0700
I was looking at the NSCache class and the NSDiscardableContent protocol for an LRU-type cache. However the documentation doesn't say anything specific about the eviction policy used (apart from setting total cost and count limits), only that:
"The NSCache class incorporates various auto-removal policies, which ensure that it does not use too much of the system’s memory. The system automatically carries out these policies if memory is needed by other applications. When invoked, these policies remove some items from the cache, minimizing its memory footprint."
Can anyone shed some light on how NSCache decides on which items to evict?
If this can't be known, can anyone suggest an alternative to NSCache that implements an LRU-type eviction policy? Perhaps it might be possible to overlay an LRU-type eviction policy by careful implementation of the NSDiscardableContent protocol?
Best,
Dalmazio
Attachment:
smime.p7s
Description: S/MIME cryptographic signature
_______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden