[NFR] Cache flush

[viktoras25]

I was quite surprised not to found flush method in the Cache interfaces and classes. The simples example of use is: I have a running website, i've updated configuration and I need to reset the configuration cache.

In my specific current example I want to flush memcached cache, which is possible with plain php: http://www.php.net/manual/en/memcached.flush.php

Proposed change: Add flush() method to \Phalcon\Cache\BackendInterface

It should either invalidate or delete all cache entries.

[dreamsxin]

\Phalcon\Cache with the prefix, if use flush, will delete other prefixes Cache

[viktoras25]

Wow, this looks like a huge piece of work. Thanks.

[lexus27]

Is there a mechanism for centralized reset memcache, both say reset memcache in interface modelsManager\MetaData? translating it through translator)))

[lexus27]

Put all CacheBackend an array backend, and use anywhere static method :: flush () to reset all backend, good Idea?

[lexus27]

Auto put

[lexus27]

If there is a lot of client users CacheBackend and CacheFrontend, is once again fit to reset all these CacheBackend, one method