For #17969: add duration probes for App.onCreate and HomeActivity.onC…

…reate.

app/metrics.yaml

@@ -3962,6 +3962,38 @@ startup.timeline:
       - mcomella@mozilla.com
     expires: "2021-08-01"
 
+perf.startup:
+  application_on_create:
+    type: timing_distribution
+    time_unit: millisecond
+    description: |
+      The duration of `FenixApplication.onCreate` in the main process.
+    bugs:
+      - https://github.com/mozilla-mobile/fenix/issues/17969
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/pull/17973#issue-572183889
+    data_sensitivity:
+      - technical
+    notification_emails:
+      - perf-android-fe@mozilla.com
+      - mcomella@mozilla.com
+    expires: "2021-08-11"
+  home_activity_on_create:
+    type: timing_distribution
+    time_unit: millisecond
+    description: |
+      The duration of `HomeActivity.onCreate`.
+    bugs:
+      - https://github.com/mozilla-mobile/fenix/issues/17969
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/pull/17973#issue-572183889
+    data_sensitivity:
+      - technical
+    notification_emails:
+      - perf-android-fe@mozilla.com
+      - mcomella@mozilla.com
+    expires: "2021-08-11"
+
 perf.awesomebar:
   history_suggestions:
     send_in_pings:

app/src/main/java/org/mozilla/fenix/FenixApplication.kt

@@ -39,6 +39,7 @@ import mozilla.components.support.rusthttp.RustHttpConfig
 import mozilla.components.support.rustlog.RustLog
 import mozilla.components.support.utils.logElapsedTime
 import mozilla.components.support.webextensions.WebExtensionSupport
+import org.mozilla.fenix.GleanMetrics.PerfStartup
 import org.mozilla.fenix.components.Components
 import org.mozilla.fenix.components.metrics.MetricServiceType
 import org.mozilla.fenix.ext.settings
@@ -71,6 +72,7 @@ open class FenixApplication : LocaleAwareApplication(), Provider {
         private set
 
     override fun onCreate() {
+        val methodDurationTimerId = PerfStartup.applicationOnCreate.start() // DO NOT MOVE ANYTHING ABOVE HERE.
         super.onCreate()
 
         setupInAllProcesses()
@@ -92,6 +94,9 @@ open class FenixApplication : LocaleAwareApplication(), Provider {
         }
 
         setupInMainProcessOnly()
+
+        // We use start/stop instead of measure so we don't measure outside the main process.
+        PerfStartup.applicationOnCreate.stopAndAccumulate(methodDurationTimerId) // DO NOT MOVE ANYTHING BELOW HERE.
     }
 
     protected open fun initializeGlean() {

app/src/main/java/org/mozilla/fenix/HomeActivity.kt

@@ -65,6 +65,7 @@ import mozilla.components.support.utils.SafeIntent
 import mozilla.components.support.utils.toSafeIntent
 import mozilla.components.support.webextensions.WebExtensionPopupFeature
 import org.mozilla.fenix.GleanMetrics.Metrics
+import org.mozilla.fenix.GleanMetrics.PerfStartup
 import org.mozilla.fenix.addons.AddonDetailsFragmentDirections
 import org.mozilla.fenix.addons.AddonPermissionsDetailsFragmentDirections
 import org.mozilla.fenix.browser.browsingmode.BrowsingMode
@@ -163,7 +164,7 @@ open class HomeActivity : LocaleAwareAppCompatActivity(), NavHostActivity {
 
     private lateinit var navigationToolbar: Toolbar
 
-    final override fun onCreate(savedInstanceState: Bundle?) {
+    final override fun onCreate(savedInstanceState: Bundle?): Unit = PerfStartup.homeActivityOnCreate.measure {
         // DO NOT MOVE ANYTHING ABOVE THIS addMarker CALL.
         components.core.engine.profiler?.addMarker("Activity.onCreate", "HomeActivity")
 

app/src/test/java/org/mozilla/fenix/FenixApplicationTest.kt

@@ -0,0 +1,35 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.fenix
+
+import androidx.test.core.app.ApplicationProvider
+import mozilla.components.service.glean.testing.GleanTestRule
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mozilla.fenix.GleanMetrics.PerfStartup
+import org.mozilla.fenix.helpers.FenixRobolectricTestRunner
+
+@RunWith(FenixRobolectricTestRunner::class)
+class FenixApplicationTest {
+
+    @get:Rule val gleanTestRule = GleanTestRule(ApplicationProvider.getApplicationContext())
+
+    private lateinit var application: FenixApplication
+
+    @Before
+    fun setUp() {
+        application = ApplicationProvider.getApplicationContext()
+    }
+
+    @Test
+    fun `GIVEN onCreate is called THEN the duration is measured`() {
+        // application.onCreate is called before the test as part of test set up:
+        // https://robolectric.blogspot.com/2013/04/the-test-lifecycle-in-20.html
+        assertTrue(PerfStartup.applicationOnCreate.testHasValue())
+    }
+}

app/src/test/java/org/mozilla/fenix/HomeActivityTest.kt

@@ -6,10 +6,12 @@ package org.mozilla.fenix
 
 import android.content.Intent
 import android.os.Bundle
+import androidx.test.core.app.ApplicationProvider
 import io.mockk.every
 import io.mockk.mockk
 import io.mockk.spyk
 import io.mockk.verify
+import mozilla.components.service.glean.testing.GleanTestRule
 import mozilla.components.support.test.robolectric.testContext
 import mozilla.components.support.utils.toSafeIntent
 import org.junit.Assert.assertEquals
@@ -18,8 +20,10 @@ import org.junit.Assert.assertNotEquals
 import org.junit.Assert.assertNull
 import org.junit.Assert.assertTrue
 import org.junit.Before
+import org.junit.Rule
 import org.junit.Test
 import org.junit.runner.RunWith
+import org.mozilla.fenix.GleanMetrics.PerfStartup
 import org.mozilla.fenix.HomeActivity.Companion.PRIVATE_BROWSING_MODE
 import org.mozilla.fenix.browser.browsingmode.BrowsingMode
 import org.mozilla.fenix.browser.browsingmode.BrowsingModeManager
@@ -28,10 +32,13 @@ import org.mozilla.fenix.ext.components
 import org.mozilla.fenix.ext.settings
 import org.mozilla.fenix.helpers.FenixRobolectricTestRunner
 import org.mozilla.fenix.utils.Settings
+import org.robolectric.Robolectric
 
 @RunWith(FenixRobolectricTestRunner::class)
 class HomeActivityTest {
 
+    @get:Rule val gleanTestRule = GleanTestRule(ApplicationProvider.getApplicationContext())
+
     private lateinit var activity: HomeActivity
 
     @Before
@@ -131,4 +138,20 @@ class HomeActivityTest {
 
         assertFalse(activity.isActivityColdStarted(startingIntent, Bundle()))
     }
+
+    @Test
+    fun `WHEN onCreate is called THEN the duration is measured`() {
+        assertFalse(PerfStartup.homeActivityOnCreate.testHasValue()) // sanity check.
+
+        // For some reason, the androidx replacement for this method, ActivityScenario, fails so we
+        // use the old Robolectric version. Perhaps it's because it forces the Activity to the
+        // RESUMED state (unlike Robolectric where we can get to CREATED) so not enough code is
+        // mocked for that to work.
+        //
+        // There are various exceptions thrown on background threads when this test runs but it
+        // doesn't seem to impact correctness so we ignore them.
+        Robolectric.buildActivity(HomeActivity::class.java)
+            .create()
+        assertTrue(PerfStartup.homeActivityOnCreate.testHasValue())
+    }
 }

docs/metrics.md

@@ -315,6 +315,8 @@ The following metrics are added to the ping:
 | perf.awesomebar.session_suggestions |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |Duration of a session awesomebar suggestion query.  |[1](https://github.com/mozilla-mobile/fenix/pull/10276#pullrequestreview-411101979)||2020-11-15 |1, 2 |
 | perf.awesomebar.shortcuts_suggestions |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |Duration of a shortcuts awesomebar suggestion query.  |[1](https://github.com/mozilla-mobile/fenix/pull/10276#pullrequestreview-411101979)||2020-11-15 |1, 2 |
 | perf.awesomebar.synced_tabs_suggestions |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |Duration of a synced tabs awesomebar suggestion query.  |[1](https://github.com/mozilla-mobile/fenix/pull/10276#pullrequestreview-411101979)||2020-11-15 |1, 2 |
+| perf.startup.application_on_create |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |The duration of `FenixApplication.onCreate` in the main process.  |[1](todo)||2021-08-11 |1 |
+| perf.startup.home_activity_on_create |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |The duration of `HomeActivity.onCreate`.  |[1](todo)||2021-08-11 |1 |
 | preferences.accessibility_services |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |Whether or not the user has touch exploration or switch services enabled. These are built into the Android OS, not Fenix prefs. default: ""  |[1](https://github.com/mozilla-mobile/fenix/pull/11211), [2](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
 | preferences.open_links_in_a_private_tab |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |Whether or not the user has enabled open links in a private tab. default: false  |[1](https://github.com/mozilla-mobile/fenix/pull/11211), [2](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
 | preferences.open_links_in_app |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |Whether or not the user has the open links in apps feature enabled. default: false  |[1](https://github.com/mozilla-mobile/fenix/pull/11446), [2](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |