How to use memcache (redis) in custom app

Nextcloud version 11
Operating system and version Ubuntu 16.04
PHP version 7.1

did you ever find out how to?

ok. if somebody else ever has the same question:
assuming that you use redis for file locking, you can get it like that:

class test {
    public function __construct(ICacheFactory $cacheFactory) {
	$this->redis = $cacheFactory->createLocking ( "oc_midwife_" );
    }
}

Otherwise something like that should work (untested). the redis server needs to be defined in the config

class test {
    public function __construct(RedisFactory $factory) {
	$this->redis = $factory->create();
    }
}