mirror of
https://github.com/wanghongenpin/proxypin.git
synced 2026-05-10 00:44:12 +08:00
51 lines
1.3 KiB
Dart
51 lines
1.3 KiB
Dart
/*
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* Copyright 2023 WangHongEn
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import 'dart:async';
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class ExpiringCache<K, V> {
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final Duration duration;
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final _cache = <K, V>{};
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final _expirationTimes = <K, Timer>{};
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ExpiringCache(this.duration);
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void set(K key, V value) {
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_expirationTimes[key]?.cancel();
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_cache[key] = value;
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_expirationTimes[key] = Timer(duration, () => remove(key));
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}
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V? putIfAbsent(K key, V Function() ifAbsent) {
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if (_cache.containsKey(key)) {
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return _cache[key];
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}
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final value = ifAbsent();
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set(key, value);
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return value;
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}
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V? get(K key) {
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return _cache[key];
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}
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remove(K key) {
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_expirationTimes[key]?.cancel();
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_expirationTimes.remove(key);
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_cache.remove(key);
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}
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} |