[FEATURE] Expire entire cache

ZiggyCreatures / FusionCache

FusionCache is an easy to use, fast and robust hybrid cache with advanced resiliency features.

MIT License

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[FEATURE] Expire entire cache #178

Closed giulianob closed 6 months ago

giulianob commented 11 months ago

Problem

I have a backplane which pushes updates to the cache. I'd like to expire the entire cache (not remove the items) if the backplane connection is severed.

Solution

Ability to call ExpireAsync on the cache or some way to achieve this.

jodydonetti commented 11 months ago

Hi @giulianob , I'm not sure I understand the scenario you have in mind.

May I ask you to try to explain it a little bit more? Maybe with a concrete example, a step-by-step list like:

I do this
and this happens
then this happens
etc

Thanks!

giulianob commented 11 months ago

@jodydonetti

The use case is as following:

There is a custom backplane implementation
When an item changes, the backplane pushes a message to all of the connected clients
When a client receives backplane message, the item should be expired from the cache (not removed)
If the connection between the client and backplane is disconnected, all items in the cache should be marked as expired (because the client may have missed item change messages)

jodydonetti commented 6 months ago

Hi @giulianob , sorry for the delay but somehow I lost track of this issue.

Anyway, currently there's no ready made solution to cover this particular scenario, and in general it's not possible to completely clear a cache, for various reasons.

If you want to learn more about why this is the case and what other people do think, I suggest to take a look at the issue currently unfolding about the new distributed cache effort going on for .net 9 , it's ful of interesting experiences and ideas.

I'm closing this since, in general, a Clear() method cannot be supported, but if something new comes up I'll gladly reopen it.