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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
export function ResponsivenessMonitor(intervalMS = 100) {
this._intervalMS = intervalMS;
this._prevTimestamp = Date.now();
this._accumulatedDelay = 0;
this._timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
this._timer.initWithCallback(
this,
this._intervalMS,
Ci.nsITimer.TYPE_REPEATING_SLACK
);
}
ResponsivenessMonitor.prototype = {
QueryInterface: ChromeUtils.generateQI(["nsINamed", "nsITimerCallback"]),
name: "ResponsivenessMonitor",
notify() {
let now = Date.now();
this._accumulatedDelay += Math.max(
0,
now - this._prevTimestamp - this._intervalMS
);
this._prevTimestamp = now;
},
abort() {
if (this._timer) {
this._timer.cancel();
this._timer = null;
}
},
finish() {
this.abort();
return this._accumulatedDelay;
},
};