Feature request: Renaming

[codesoap]

There is no way to just change the key for an item. If I wanted to do this manually, I would have to use Delete and then Add, but upon deletion the OnEvicted function would be called, which I don't want.

My use case is a webservice, where the user can create some data entry using an assistant, which consists of multiple web pages. I use go-cache to store the already entered data from past pages until the assistant is finished. I use an XSRF-token (generated with golang.org/x/net/xsrftoken) as the key for the cache item. My issue with this is, that I cannot extend the validity of the token after one step of the assistant has been completed, so I would have to generate a new one, but copying the cache item, so that it can be found with the new token would be expensive (contains large files, which are deleted through OnEvicted).

Ideally I could also set a new duration upon renaming, but maybe this would be better as a separate feature.

[arp242]

I implemented this as Rename() in https://github.com/arp242/zcache; it doesn't update the expiry, so you'll have to do a second Touch() call to update that if you want it.

Since this hasn't been maintained for a few years, I've been maintaining a fork over there.

[arp242]

Oh, also your PR #153 from last month is implemented as DeleteAll() in zcache. I did that last year already (I made a new function because both calling and not calling onEvicted have valid use cases).

[codesoap]

Thanks for the info and thanks for implementing Rename() so quickly. I'll check out your fork.