Function which provides arguments bundle used by different cache operations (for the moment only Cache.set operation) for the specified key.
key
Key, args bundle of which is needed.
Arguments bundle. If key doesn't require any arguments, undefined needs to be returned.
undefined
Asynchronous function which retrieves value of the key.
Key, value of which needs to be retrieved.
Value of the key. Notice that null is a valid value. If key doesn't have any value, undefined needs to be returned.
null
Function which provides arguments bundle used by different cache operations (for the moment only Cache.set operation) for the specified
key.