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-rw-r--r--ext/js/general/task-accumulator.js81
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diff --git a/ext/js/general/task-accumulator.js b/ext/js/general/task-accumulator.js
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+++ b/ext/js/general/task-accumulator.js
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+/*
+ * Copyright (C) 2020-2021 Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+class TaskAccumulator {
+ constructor(runTasks) {
+ this._deferPromise = null;
+ this._activePromise = null;
+ this._tasks = [];
+ this._tasksActive = [];
+ this._uniqueTasks = new Map();
+ this._uniqueTasksActive = new Map();
+ this._runTasksBind = this._runTasks.bind(this);
+ this._tasksCompleteBind = this._tasksComplete.bind(this);
+ this._runTasks = runTasks;
+ }
+
+ enqueue(key, data) {
+ if (this._deferPromise === null) {
+ const promise = this._activePromise !== null ? this._activePromise : Promise.resolve();
+ this._deferPromise = promise.then(this._runTasksBind);
+ }
+
+ const task = {data, stale: false};
+ if (key !== null) {
+ const activeTaskInfo = this._uniqueTasksActive.get(key);
+ if (typeof activeTaskInfo !== 'undefined') {
+ activeTaskInfo.stale = true;
+ }
+
+ this._uniqueTasks.set(key, task);
+ } else {
+ this._tasks.push(task);
+ }
+
+ return this._deferPromise;
+ }
+
+ _runTasks() {
+ this._deferPromise = null;
+
+ // Swap
+ [this._tasks, this._tasksActive] = [this._tasksActive, this._tasks];
+ [this._uniqueTasks, this._uniqueTasksActive] = [this._uniqueTasksActive, this._uniqueTasks];
+
+ const promise = this._runTasksAsync();
+ this._activePromise = promise.then(this._tasksCompleteBind);
+ return this._activePromise;
+ }
+
+ async _runTasksAsync() {
+ try {
+ const allTasks = [
+ ...this._tasksActive.map((taskInfo) => [null, taskInfo]),
+ ...this._uniqueTasksActive.entries()
+ ];
+ await this._runTasks(allTasks);
+ } catch (e) {
+ yomichan.logError(e);
+ }
+ }
+
+ _tasksComplete() {
+ this._tasksActive.length = 0;
+ this._uniqueTasksActive.clear();
+ this._activePromise = null;
+ }
+}