62 lines
1.7 KiB
JavaScript
62 lines
1.7 KiB
JavaScript
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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity 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 General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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// Allow a web worker in the browser, with a fallback for Node.js
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const hasWebWorkers = typeof Worker !== 'undefined';
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const KeyWorker = hasWebWorkers ? require('worker-loader!./worker')
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: require('./worker').KeyWorker;
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class WorkerContainer {
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busy = false;
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_worker = new KeyWorker();
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action (action, payload) {
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if (this.busy) {
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throw new Error('Cannot issue an action on a busy worker!');
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}
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this.busy = true;
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return new Promise((resolve, reject) => {
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this._worker.postMessage({ action, payload });
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this._worker.onmessage = ({ data }) => {
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this.busy = false;
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resolve(data);
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};
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});
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}
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}
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class WorkerPool {
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pool = [];
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getWorker () {
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let container = this.pool.find((container) => !container.busy);
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if (container) {
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return container;
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}
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container = new WorkerContainer();
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this.pool.push(container);
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return container;
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}
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}
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export default new WorkerPool();
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