зеркало из https://github.com/mozilla/gecko-dev.git
82 строки
2.2 KiB
JavaScript
82 строки
2.2 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 protocol = require("devtools/shared/protocol");
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const {method, Arg, RetVal} = protocol;
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const events = require("sdk/event/core");
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var EventLoopLagActor = exports.EventLoopLagActor = protocol.ActorClass({
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typeName: "eventLoopLag",
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_observerAdded: false,
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events: {
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"event-loop-lag" : {
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type: "event-loop-lag",
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time: Arg(0, "number") // duration of the lag in milliseconds.
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}
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},
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/**
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* Start tracking the event loop lags.
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*/
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start: method(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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request: {},
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response: {success: RetVal("number")}
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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: method(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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}, {request: {}, response: {}}),
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destroy: function () {
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this.stop();
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protocol.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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exports.EventLoopLagFront = protocol.FrontClass(EventLoopLagActor, {
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initialize: function (client, form) {
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protocol.Front.prototype.initialize.call(this, client);
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this.actorID = form.eventLoopLagActor;
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this.manage(this);
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},
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});
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