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34 lines
1018 B
TypeScript
34 lines
1018 B
TypeScript
/*
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Copyright 2020 Bruno Windels <bruno@windels.cloud>
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 {ObservableValue} from "./index";
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export class RetainedObservableValue<T> extends ObservableValue<T> {
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constructor(initialValue: T, private freeCallback: () => void, private startCallback: () => void = () => {}) {
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super(initialValue);
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}
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onSubscribeFirst(): void {
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this.startCallback();
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}
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onUnsubscribeLast(): void {
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super.onUnsubscribeLast();
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this.freeCallback();
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}
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}
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