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81 lines
3.3 KiB
Kotlin
81 lines
3.3 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.components.metrics
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import android.os.Process
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import android.os.SystemClock
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.withContext
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import org.mozilla.fenix.components.metrics.Event.AppAllStartup.Type
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import org.mozilla.fenix.components.metrics.Event.AppAllStartup.Type.ERROR
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import org.mozilla.fenix.components.metrics.Event.AppAllStartup.Type.WARM
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import org.mozilla.fenix.components.metrics.Event.AppAllStartup.Type.HOT
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import org.mozilla.fenix.components.metrics.Event.AppAllStartup.Type.COLD
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import org.mozilla.fenix.perf.Stat
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/**
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* Handles the logic of figuring out launch time for cold, warm and hot startup.
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*/
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class AppLaunchTimeMeasurement(private val stats: Stat = Stat()) {
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private var isOnPreDrawCalled = false
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private var applicationOnCreateTimeStampNanoSeconds: Long? = null
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private var homeActivityInitTimeStampNanoSeconds: Long? = null
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private var homeActivityOnRestartTimeStampNanoSeconds: Long? = null
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// we are considering screen to be visible after the first pre draw call.
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private var homeActivityOnPreDrawTimeStampNanoSeconds: Long? = null
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fun onHomeActivityOnCreate(activityInitNanos: Long) {
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this.homeActivityInitTimeStampNanoSeconds = activityInitNanos
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}
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fun onHomeActivityOnRestart(activityOnRestartNanos: Long = SystemClock.elapsedRealtimeNanos()) {
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homeActivityOnRestartTimeStampNanoSeconds = activityOnRestartNanos
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}
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fun onFirstFramePreDraw(activityOnPreDrawNanos: Long = SystemClock.elapsedRealtimeNanos()) {
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isOnPreDrawCalled = true
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homeActivityOnPreDrawTimeStampNanoSeconds = activityOnPreDrawNanos
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}
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/**
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* if we have both start and finish time for launch, return the difference otherwise return null.
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*/
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suspend fun getApplicationLaunchTime(startupType: Type): Long? = withContext(Dispatchers.IO) {
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when {
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// one use case is user launching the app and quicky pressing back button. in that case
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// there will be no onPredraw call but activity will call onStop().
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!isOnPreDrawCalled -> {
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null
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}
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else -> {
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when (startupType) {
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COLD -> {
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applicationOnCreateTimeStampNanoSeconds =
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stats.getProcessStartTimeStampNano(Process.myPid())
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homeActivityOnPreDrawTimeStampNanoSeconds!!.minus(
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applicationOnCreateTimeStampNanoSeconds!!
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)
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}
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WARM -> {
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homeActivityOnPreDrawTimeStampNanoSeconds!!.minus(
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homeActivityInitTimeStampNanoSeconds!!
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)
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}
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HOT -> {
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homeActivityOnPreDrawTimeStampNanoSeconds!!.minus(
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homeActivityOnRestartTimeStampNanoSeconds!!
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)
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}
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ERROR -> {
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null
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}
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}
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}
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}
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}
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}
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