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Bug 963499 - Implement a jank watcher to display event loop lags in Firefox OS's Developer HUD. r=vingtetun

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This commit is contained in:
Jan Keromnes 2014-02-14 11:52:14 -05:00
parent 01f4fc29a4
commit 8f37aa271a
1 changed files with 69 additions and 0 deletions
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69
b2g/chrome/content/devtools.js
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@ -15,6 +15,12 @@ XPCOMUtils.defineLazyGetter(this, 'WebConsoleUtils', function() {
return devtools.require("devtools/toolkit/webconsole/utils").Utils;
});
XPCOMUtils.defineLazyGetter(this, 'EventLoopLagFront', function() {
const {devtools} = Cu.import("resource://gre/modules/devtools/Loader.jsm", {});
return devtools.require("devtools/server/actors/eventlooplag").EventLoopLagFront;
});
/**
* The Widget Panel is an on-device developer tool that displays widgets,
* showing visual debug information about apps. Each widget corresponds to a
@ -358,4 +364,67 @@ let consoleWatcher = {
return source;
}
};
devtoolsWidgetPanel.registerWatcher(consoleWatcher);
let jankWatcher = {
_client: null,
_fronts: new Map(),
_active: false,
init: function(client) {
this._client = client;
SettingsListener.observe('devtools.hud.jank', false,
this.settingsListener.bind(this));
},
settingsListener: function(value) {
if (this._active == value) {
return;
}
this._active = value;
// Toggle the state of existing fronts.
let fronts = this._fronts;
for (let app of fronts.keys()) {
if (value) {
fronts.get(app).start();
} else {
fronts.get(app).stop();
app.metrics.set('jank', 0);
app.display();
}
}
},
trackApp: function(app) {
app.metrics.set('jank', 0);
let front = new EventLoopLagFront(this._client, app.actor);
this._fronts.set(app, front);
front.on('event-loop-lag', time => {
app.metrics.set('jank', time);
if (!app.display()) {
devtoolsWidgetPanel.log('jank: ' + time + 'ms');
}
});
if (this._active) {
front.start();
}
},
untrackApp: function(app) {
let fronts = this._fronts;
if (fronts.has(app)) {
fronts.get(app).destroy();
fronts.delete(app);
}
}
};
devtoolsWidgetPanel.registerWatcher(jankWatcher);