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/*
* Copyright (C) 2023 Yomitan Authors
* 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/>.
*/
import {log} from '../core.js';
/**
* @template K,V
*/
export class TaskAccumulator {
/**
* @param {(tasks: [key: ?K, task: import('task-accumulator').Task<V>][]) => Promise<void>} runTasks
*/
constructor(runTasks) {
/** @type {?Promise<void>} */
this._deferPromise = null;
/** @type {?Promise<void>} */
this._activePromise = null;
/** @type {import('task-accumulator').Task<V>[]} */
this._tasks = [];
/** @type {import('task-accumulator').Task<V>[]} */
this._tasksActive = [];
/** @type {Map<K, import('task-accumulator').Task<V>>} */
this._uniqueTasks = new Map();
/** @type {Map<K, import('task-accumulator').Task<V>>} */
this._uniqueTasksActive = new Map();
/** @type {() => Promise<void>} */
this._runTasksBind = this._runTasks.bind(this);
/** @type {() => void} */
this._tasksCompleteBind = this._tasksComplete.bind(this);
/** @type {(tasks: [key: ?K, task: import('task-accumulator').Task<V>][]) => Promise<void>} */
this._runTasksCallback = runTasks;
}
/**
* @param {?K} key
* @param {V} data
* @returns {Promise<void>}
*/
enqueue(key, data) {
if (this._deferPromise === null) {
const promise = this._activePromise !== null ? this._activePromise : Promise.resolve();
this._deferPromise = promise.then(this._runTasksBind);
}
/** @type {import('task-accumulator').Task<V>} */
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;
}
/**
* @returns {Promise<void>}
*/
_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;
}
/**
* @returns {Promise<void>}
*/
async _runTasksAsync() {
try {
/** @type {[key: ?K, task: import('task-accumulator').Task<V>][]} */
const allTasks = [];
for (const taskInfo of this._tasksActive) {
allTasks.push([null, taskInfo]);
}
for (const [key, taskInfo] of this._uniqueTasksActive) {
allTasks.push([key, taskInfo]);
}
await this._runTasksCallback(allTasks);
} catch (e) {
log.error(e);
}
}
/**
* @returns {void}
*/
_tasksComplete() {
this._tasksActive.length = 0;
this._uniqueTasksActive.clear();
this._activePromise = null;
}
}
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