49 lines
1.4 KiB
Dart
49 lines
1.4 KiB
Dart
/*
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* Copyright (c) 2024-2026 Fabian Freund.
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*
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* This file is part of WebLibre
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* (see https://weblibre.eu).
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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import 'dart:async';
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import 'package:hooks_riverpod/misc.dart';
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import 'package:riverpod/riverpod.dart';
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extension CacheForExtension on Ref {
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/// Keeps the provider alive for [duration] after the last listener is removed.
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KeepAliveLink cacheFor(Duration duration) {
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Timer? timer;
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final link = keepAlive();
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onCancel(() {
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// All listeners are gone — start the dispose timer.
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timer = Timer(duration, link.close);
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});
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onResume(() {
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// A new listener was added — cancel the timer.
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timer?.cancel();
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});
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onDispose(() {
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// Provider is being fully disposed — clean up.
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timer?.cancel();
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});
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return link;
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}
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}
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