Finds a value in the cache.
Finds a value in the cache.
The type of the object to return.
The key of the item to found.
The found value or None if no value could be found.
Remove a value from the cache.
Remove a value from the cache.
Item key.
An empty future to wait for removal.
Save a value in cache.
Save a value in cache.
The item key under which the value should be saved.
The value to save.
Expiration time in seconds (0 second means eternity).
The value saved in cache.
A trait which provides a cache API.