41 lines
1.7 KiB
Kotlin
41 lines
1.7 KiB
Kotlin
/* 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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package org.mozilla.fenix.perf
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import androidx.core.view.doOnPreDraw
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import kotlinx.android.synthetic.main.activity_home.*
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import org.mozilla.fenix.HomeActivity
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/**
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* A collection of objects related to app performance.
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*/
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object Performance {
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const val TAG = "FenixPerf"
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/**
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* Instruments cold startup time for use with our internal measuring system, FNPRMS. This may
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* also appear in Google Play Vitals dashboards.
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*
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* This will need to be rewritten if any parts of the UI are changed to be displayed
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* asynchronously.
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*
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* In the current implementation, we only intend to instrument cold startup to the homescreen.
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* To save implementation time, we ignore the fact that the RecyclerView draws twice if the user
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* has tabs, collections, etc. open: the "No tabs" placeholder and a tab list. This
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* instrumentation will only capture the "No tabs" draw.
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*/
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fun instrumentColdStartupToHomescreenTime(activity: HomeActivity) {
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// For greater accuracy, we could add an onDrawListener instead of a preDrawListener but:
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// - single use onDrawListeners are not built-in and it's non-trivial to write one
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// - the difference is timing is minimal (< 7ms on Pixel 2)
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// - if we compare against another app using a preDrawListener, it should be comparable
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//
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// Unfortunately, this is tightly coupled to the root view of HomeActivity's view hierarchy
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activity.rootContainer.doOnPreDraw {
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activity.reportFullyDrawn()
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}
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}
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}
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