Let’s assume I have a bundle which weights like 100mb, and it might be updated on server. If it gets updated, a client re-downloads it (using WWW.LoadFromCacheOrDownload with a new version number). After a client finishes downloading, it knows for certain that previous version will no be longer needed and it can delete it (otherwise it will consume that 100mb for Caching.expirationDelay seconds). I can’t set expiration delay to some low number since it will affect other bundles as well.
Is there any way to delete it without deleting ALL the cache using Caching.CleanCache?
I guess this is something that was never implemented using Unity’s caching system.
We just started working with asset bundles ourselves, and due to a number of reasons chose to implement our own caching mechanism. You could do the same yourself, starting bare bones with only a simple mechanism for storing the downloaded content to a folder on the device. This gives you access to managing the cache yourself (purging unneeded content, setting different policies for retaining data in cache,etc).
Just do it yourself is rarely a viable solution with any sort of time pressure… it’s why we use an engine.
Plus, clearing a single reference from cache is an obvious necessity of a caching system.
