61 lines
1.7 KiB
JavaScript
61 lines
1.7 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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/**
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* The eventLoopLag actor emits "event-loop-lag" events when the event
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* loop gets unresponsive. The event comes with a "time" property (the
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* duration of the lag in milliseconds).
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*/
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const {Ci} = require("chrome");
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const Services = require("Services");
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const {XPCOMUtils} = require("resource://gre/modules/XPCOMUtils.jsm");
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const {Actor, ActorClassWithSpec} = require("devtools/shared/protocol");
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const events = require("sdk/event/core");
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const {eventLoopLagSpec} = require("devtools/shared/specs/eventlooplag");
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var EventLoopLagActor = exports.EventLoopLagActor = ActorClassWithSpec(eventLoopLagSpec, {
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_observerAdded: false,
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/**
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* Start tracking the event loop lags.
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*/
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start: function () {
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if (!this._observerAdded) {
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Services.obs.addObserver(this, "event-loop-lag", false);
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this._observerAdded = true;
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}
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return Services.appShell.startEventLoopLagTracking();
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},
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/**
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* Stop tracking the event loop lags.
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*/
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stop: function () {
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if (this._observerAdded) {
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Services.obs.removeObserver(this, "event-loop-lag");
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this._observerAdded = false;
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}
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Services.appShell.stopEventLoopLagTracking();
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},
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destroy: function () {
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this.stop();
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Actor.prototype.destroy.call(this);
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},
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// nsIObserver
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observe: function (subject, topic, data) {
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if (topic == "event-loop-lag") {
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// Forward event loop lag event
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events.emit(this, "event-loop-lag", data);
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}
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},
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QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver]),
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});
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