expiry

[Joshua Thijssen]

When I add an item to the memcache and use an expiry-timestamp, it will
expire, no matter how many times the key is read in the remaing time. Is
it possible to create an item with a expiry-timestamp (an relative
value, say 60seconds), which gets reset each time the item is read so
so the item would stay in the cache until it's not read for a long time
or when we remove it.