/
TaskQueue.ts
36 lines (32 loc) · 1.15 KB
/
TaskQueue.ts
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/**
* Copyright 2020 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* TODO(jacktfranklin@): once we are calling this from TS files we can
* avoid the horrible void | any type and instead make use of generics
* to make this into TaskQueue<T> and let the caller tell us what types
* the promise in the queue should return.
*/
class TaskQueue {
_chain: Promise<void | any>;
constructor() {
this._chain = Promise.resolve();
}
public postTask(task: () => any): Promise<void | any> {
const result = this._chain.then(task);
this._chain = result.catch(() => {});
return result;
}
}
export = { TaskQueue };