30 lines
977 B
TypeScript
30 lines
977 B
TypeScript
/*
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Copyright 2021 The Matrix.org Foundation C.I.C.
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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 { EnhancedMap } from "./maps";
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import AwaitLock from "await-lock";
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export type DoneFn = () => void;
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export class MultiLock {
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private locks = new EnhancedMap<string, AwaitLock>();
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public async acquire(key: string): Promise<DoneFn> {
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const lock = this.locks.getOrCreate(key, new AwaitLock());
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await lock.acquireAsync();
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return () => lock.release();
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}
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}
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