deleteExpired method
void
deleteExpired()
Deletes all expired items from the cache.
Implementation
void deleteExpired() {
_logger.debug('Deleting expired items');
_cache.removeWhere((key, item) => item.isExpired);
final removedItem = (_cache.length - _currentSize).abs();
_logger.debug('Deleted $removedItem expired items');
_currentSize = _cache.length;
_stopCleaningIfNeeded();
}