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@alejoasotelo
Last active July 21, 2022 19:14
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TaskQueue es para agregar tareas que se ejecuten secuencialmente cada cierto intervalo de segundos.
/**
@author Alejo Sotelo <alejosotelo.com.ar>
@date 2022-07-20
Las tareas se ejecutan secuencialmente según el intervalo configurado.
Si agrego 3 task/tareas, se van a ejecutar en el orden que las agrego.
Cada task tiene un callback (function) que tiene que devolver true (se elimina la tarea y no se ejecuta más) o false (se sigue ejecutando).
var fiveSeconds = 5 * 1000;
var myTasks = new TaskQueue(fiveSeconds);
myTasks.addTask('one', _ => { console.log('Executing one'); return true; }); // se ejecute una sola vez
var i = 0;
myTasks.addTask('two', _ => { console.log('Executing two ' + ++i); return i >= 2; }); // se ejecute 2 veces (i>=2)
var j = 0;
myTasks.addTask('three', _ => {
console.log('Executing three', j);
return new Promise(resolve => {
setTimeout(_ => {
console.log('Finishing three', j);
resolve(j++ > 2);
}, 2000);
});
}); // se ejecute 2 veces (i>=2)
myTasks.run();
*/
window.requestAnimFrame = (function() {
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function(callback) {
window.setTimeout(callback, 1000 / 60);
};
})();
var TaskQueue = function(intervalSeconds, debug) {
intervalSeconds = intervalSeconds || 1000;
var start = 0,
running = false,
debug = typeof debug == 'boolean' ? debug : false,
queue = [],
i = 0;
this.run = _ => {
start = performance.now();
running = true;
i = 0;
this.loop();
}
this.stop = _ => {
running = false;
}
this.addTask = (name, callback) => {
if (this.getTask(name)) {
return false;
}
queue.push({
name,
callback
});
}
this.getTask = (name) => {
return queue.find(i => i.name == name);
}
this.getTasks = () => {
return queue;
}
this.removeTask = (name) => {
var index = queue.findIndex(i => i.name == name);
if (index >= 0) {
queue.splice(index, 1);
}
}
this.removeAllTasks = () => {
queue = [];
}
this.isRunning = () => running;
this.loop = async _ => {
if (queue.length == 0) {
if (debug) {
console.debug('No hay tareas');
}
return false;
}
var now = performance.now();
var delta = now - start;
if (delta >= intervalSeconds) {
if (debug) {
var TaskQueue = function (intervalSeconds, debug) {
intervalSeconds = intervalSeconds || 1000;
debug = typeof debug == 'boolean' ? debug : false;
var timeStart = 0,
running = false,
queue = [],
i = 0;
this.start = _ => {
timeStart = performance.now();
running = true;
i = 0;
this.loop();
}
this.stop = _ => {
running = false;
}
this.addTask = (name, callback) => {
if (this.getTask(name)) {
return false;
}
queue.push({
name,
callback
});
}
this.getTask = (name) => {
return queue.find(i => i.name == name);
}
this.getTasks = () => {
return queue;
}
this.removeTask = (name) => {
var index = queue.findIndex(i => i.name == name);
if (index >= 0) {
queue.splice(index, 1);
}
}
this.removeAllTasks = () => {
queue = [];
}
this.isRunning = () => running;
this.loop = async _ => {
if (queue.length == 0) {
if (debug) {
console.debug('No hay tareas');
}
return false;
}
var now = performance.now();
var delta = now - timeStart;
if (delta >= intervalSeconds) {
if (debug) {
console.debug(`Task *${queue[i].name}* running...`, +new Date());
}
var haveToRemove = await queue[i].callback();
timeStart = performance.now();
if (haveToRemove) {
queue.splice(i, 1);
if (queue.length == 0) {
running = false;
}
i--;
}
i++;
if (i > queue.length - 1) {
i = 0;
}
}
if (running) {
requestAnimFrame(this.loop);
} else if (debug) {
if (queue.length == 0) {
console.debug('All tasks have been completed');
} else {
console.debug('Task stopped');
}
}
}
}
@alejoasotelo
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Casos de uso

  • Extensión de Chrome/Firefox que ejecute tareas cada cierto tiempo para buscar productos a X precio, stock, etc.
  • Simular cronjobs?

@alejoasotelo
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Mejore el script para usar requestAnimationFrame en vez de setTimeout.

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