keys method
Returns all the keys.
Implementation
@override
FutureOr<List<K>> keys({Duration? timeout, bool refresh = false}) {
var now = DateTime.now();
if (refresh) {
var keys = _sharedMap.keys();
return _cacheKeys(keys, now);
}
var keysCached = _keysCached;
if (keysCached != null) {
timeout ??= this.timeout;
var elapsedTime = now.difference(keysCached.$1);
if (elapsedTime <= timeout) {
return keysCached.$2;
}
}
var keysAsync = _keysAsync;
if (keysAsync != null) {
return keysAsync;
}
var keys = _sharedMap.keys();
return _cacheKeys(keys, now);
}