82 lines
2.6 KiB
JavaScript
82 lines
2.6 KiB
JavaScript
/*
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* Copyright (C) 2020-2021 Yomichan Authors
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*
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* This program 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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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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class TaskAccumulator {
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constructor(runTasks) {
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this._deferPromise = null;
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this._activePromise = null;
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this._tasks = [];
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this._tasksActive = [];
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this._uniqueTasks = new Map();
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this._uniqueTasksActive = new Map();
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this._runTasksBind = this._runTasks.bind(this);
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this._tasksCompleteBind = this._tasksComplete.bind(this);
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this._runTasks = runTasks;
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}
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enqueue(key, data) {
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if (this._deferPromise === null) {
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const promise = this._activePromise !== null ? this._activePromise : Promise.resolve();
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this._deferPromise = promise.then(this._runTasksBind);
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}
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const task = {data, stale: false};
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if (key !== null) {
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const activeTaskInfo = this._uniqueTasksActive.get(key);
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if (typeof activeTaskInfo !== 'undefined') {
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activeTaskInfo.stale = true;
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}
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this._uniqueTasks.set(key, task);
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} else {
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this._tasks.push(task);
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}
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return this._deferPromise;
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}
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_runTasks() {
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this._deferPromise = null;
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// Swap
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[this._tasks, this._tasksActive] = [this._tasksActive, this._tasks];
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[this._uniqueTasks, this._uniqueTasksActive] = [this._uniqueTasksActive, this._uniqueTasks];
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const promise = this._runTasksAsync();
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this._activePromise = promise.then(this._tasksCompleteBind);
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return this._activePromise;
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}
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async _runTasksAsync() {
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try {
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const allTasks = [
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...this._tasksActive.map((taskInfo) => [null, taskInfo]),
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...this._uniqueTasksActive.entries()
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];
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await this._runTasks(allTasks);
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} catch (e) {
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yomichan.logError(e);
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}
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}
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_tasksComplete() {
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this._tasksActive.length = 0;
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this._uniqueTasksActive.clear();
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this._activePromise = null;
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}
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}
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