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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) {
log.error(e);
}
}
_tasksComplete() {
this._tasksActive.length = 0;
this._uniqueTasksActive.clear();
this._activePromise = null;
}
}
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