getExpiryForAccess abstract method
Gets the Duration before an accessed CacheEntry is considered expired.
This method is called by a caching implementation after a CacheEntry is
accessed to determine the Duration before an entry expires. If a
Duration.zero is returned a CacheEntry will be considered immediately expired.
Returning null
will result in no change to the previously understood expiry
Duration
Returns the new Duration before an accessed entry expires
Implementation
Duration? getExpiryForAccess();