Cache backend type is forced

[Didstriker]

I am adding a redis server on my Typo3 instance, which uses this plugin, so I'm trying to move as many caches as possible into the redis service, but for this extension would be impossible without breaking the clear cache functionality.

Due to this extension use a custom cache backend class "ReverseProxyCacheBackend", which extends from Typo3DatabaseBackend, it forces the user to use a database backend, with no other option available.

Would it be possible to use a hook instead of extending a cache backend class?
Similar to what was done for this FrontendHook

Other possibility could be doing a decorator pattern instead of using inheritance

[bmack]

The main reason we used the DB Backend and extended it was that we had full control over fetching all contents (= all URLs) via the Cache Backend.

See https://github.com/b13/proxycachemanager/blob/master/Classes/Cache/Backend/ReverseProxyCacheBackend.php#L150