82 lines
2.6 KiB
JavaScript
82 lines
2.6 KiB
JavaScript
/*
|
|
* Copyright (C) 2020-2022 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) {
|
|
log.error(e);
|
|
}
|
|
}
|
|
|
|
_tasksComplete() {
|
|
this._tasksActive.length = 0;
|
|
this._uniqueTasksActive.clear();
|
|
this._activePromise = null;
|
|
}
|
|
}
|