twilio-video
Version:
Twilio Video JavaScript Library
83 lines • 2.51 kB
JavaScript
/**
* Expose `Backoff`.
*/
var Backoff = /** @class */ (function () {
/**
* Construct a {@link Backoff}.
* @param {object} options
* @property {number} min - Initial timeout in milliseconds [100]
* @property {number} max - Max timeout [10000]
* @property {boolean} jitter - Apply jitter [0]
* @property {number} factor - Multiplication factor for Backoff operation [2]
*/
function Backoff(options) {
Object.defineProperties(this, {
_min: {
value: options.min || 100
},
_max: {
value: options.max || 10000
},
_jitter: {
value: options.jitter > 0 && options.jitter <= 1 ? options.jitter : 0
},
_factor: {
value: options.factor || 2
},
_attempts: {
value: 0,
writable: true
},
_duration: {
enumerable: false,
get: function () {
var ms = this._min * Math.pow(this._factor, this._attempts);
if (this._jitter) {
var rand = Math.random();
var deviation = Math.floor(rand * this._jitter * ms);
ms = (Math.floor(rand * 10) & 1) === 0 ? ms - deviation : ms + deviation;
}
return Math.min(ms, this._max) | 0;
}
},
_timeoutID: {
value: null,
writable: true
}
});
}
/**
* Start the backoff operation.
* @param {function} fn - Function to call
* @return {void}
* @api public
*/
Backoff.prototype.backoff = function (fn) {
var _this = this;
var duration = this._duration;
if (this._timeoutID) {
clearTimeout(this._timeoutID);
this._timeoutID = null;
}
this._timeoutID = setTimeout(function () {
_this._attempts++;
fn();
}, duration);
};
/**
* Reset the number of attempts and clear the timer.
*
* @return {void}
* @api public
*/
Backoff.prototype.reset = function () {
this._attempts = 0;
if (this._timeoutID) {
clearTimeout(this._timeoutID);
this._timeoutID = null;
}
};
return Backoff;
}());
module.exports = Backoff;
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