Add tests for TransportStats and some refactor (602bf1a8) · Commits · e / os / android_frameworks_base

services/backup/java/com/android/server/backup/transport/TransportStats.java

+33 −33

Original line number	Diff line number	Diff line
		@@ -32,9 +32,12 @@ public class TransportStats {

		void registerConnectionTime(ComponentName transportComponent, long timeMs) {
		synchronized (mStatsLock) {
		mTransportStats
		.computeIfAbsent(transportComponent, name -> new Stats())
		.register(timeMs);
		Stats stats = mTransportStats.get(transportComponent);
		if (stats == null) {
		stats = new Stats();
		mTransportStats.put(transportComponent, stats);
		}
		stats.register(timeMs);
		}
		}

		@@ -71,52 +74,49 @@ public class TransportStats {
		private static void dumpStats(PrintWriter pw, String prefix, Stats stats) {
		pw.println(
		String.format(
		Locale.US, "%sAverage connection time: %.2f ms", prefix, stats.mAverage));
		pw.println(String.format(Locale.US, "%sMax connection time: %d ms", prefix, stats.mMax));
		pw.println(String.format(Locale.US, "%sMin connection time: %d ms", prefix, stats.mMin));
		pw.println(String.format(Locale.US, "%sNumber of connections: %d ", prefix, stats.mN));
		Locale.US, "%sAverage connection time: %.2f ms", prefix, stats.average));
		pw.println(String.format(Locale.US, "%sMax connection time: %d ms", prefix, stats.max));
		pw.println(String.format(Locale.US, "%sMin connection time: %d ms", prefix, stats.min));
		pw.println(String.format(Locale.US, "%sNumber of connections: %d ", prefix, stats.n));
		}

		public static final class Stats {
		public static Stats merge(Stats a, Stats b) {
		return new Stats(
		a.mN + b.mN,
		(a.mAverage * a.mN + b.mAverage * b.mN) / (a.mN + b.mN),
		Math.max(a.mMax, b.mMax),
		Math.min(a.mMin, b.mMin));
		a.n + b.n,
		(a.average * a.n + b.average * b.n) / (a.n + b.n),
		Math.max(a.max, b.max),
		Math.min(a.min, b.min));
		}

		public int mN;
		public double mAverage;
		public long mMax;
		public long mMin;
		public int n;
		public double average;
		public long max;
		public long min;

		public Stats() {
		mN = 0;
		mAverage = 0;
		mMax = 0;
		mMin = Long.MAX_VALUE;
		n = 0;
		average = 0;
		max = 0;
		min = Long.MAX_VALUE;
		}

		private Stats(Stats original) {
		mN = original.mN;
		mAverage = original.mAverage;
		mMax = original.mMax;
		mMin = original.mMin;
		private Stats(int n, double average, long max, long min) {
		this.n = n;
		this.average = average;
		this.max = max;
		this.min = min;
		}

		private Stats(int n, double average, long max, long min) {
		mN = n;
		mAverage = average;
		mMax = max;
		mMin = min;
		private Stats(Stats original) {
		this(original.n, original.average, original.max, original.min);
		}

		private void register(long sample) {
		mAverage = (mAverage * mN + sample) / (mN + 1);
		mN++;
		mMax = Math.max(mMax, sample);
		mMin = Math.min(mMin, sample);
		average = (average * n + sample) / (n + 1);
		n++;
		max = Math.max(max, sample);
		min = Math.min(min, sample);
		}
		}
		}

services/robotests/src/com/android/server/backup/transport/TransportStatsTest.java

0 → 100644

+105 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2018 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License
		*/

		package com.android.server.backup.transport;

		import static com.android.server.backup.testing.TransportData.backupTransport;
		import static com.android.server.backup.testing.TransportData.d2dTransport;

		import static com.google.common.truth.Truth.assertThat;

		import android.content.ComponentName;
		import android.platform.test.annotations.Presubmit;

		import com.android.server.backup.transport.TransportStats.Stats;
		import com.android.server.testing.FrameworkRobolectricTestRunner;
		import com.android.server.testing.SystemLoaderPackages;

		import org.junit.Before;
		import org.junit.Test;
		import org.junit.runner.RunWith;
		import org.robolectric.annotation.Config;

		@RunWith(FrameworkRobolectricTestRunner.class)
		@Config(manifest = Config.NONE, sdk = 26)
		@SystemLoaderPackages({"com.android.server.backup"})
		@Presubmit
		public class TransportStatsTest {
		private static final double TOLERANCE = 0.0001;

		private TransportStats mTransportStats;
		private ComponentName mTransportComponent1;
		private ComponentName mTransportComponent2;

		@Before
		public void setUp() throws Exception {
		mTransportStats = new TransportStats();
		mTransportComponent1 = backupTransport().getTransportComponent();
		mTransportComponent2 = d2dTransport().getTransportComponent();
		}

		@Test
		public void testRegisterConnectionTime() {
		mTransportStats.registerConnectionTime(mTransportComponent1, 50L);

		Stats stats = mTransportStats.getStatsForTransport(mTransportComponent1);
		assertThat(stats.average).isWithin(TOLERANCE).of(50);
		assertThat(stats.max).isEqualTo(50L);
		assertThat(stats.min).isEqualTo(50L);
		assertThat(stats.n).isEqualTo(1);
		}

		@Test
		public void testRegisterConnectionTime_whenHasAlreadyOneSample() {
		mTransportStats.registerConnectionTime(mTransportComponent1, 50L);

		mTransportStats.registerConnectionTime(mTransportComponent1, 100L);

		Stats stats = mTransportStats.getStatsForTransport(mTransportComponent1);
		assertThat(stats.average).isWithin(TOLERANCE).of(75);
		assertThat(stats.max).isEqualTo(100L);
		assertThat(stats.min).isEqualTo(50L);
		assertThat(stats.n).isEqualTo(2);
		}

		@Test
		public void testGetStatsForTransport() {
		mTransportStats.registerConnectionTime(mTransportComponent1, 10L);
		mTransportStats.registerConnectionTime(mTransportComponent2, 20L);

		Stats stats = mTransportStats.getStatsForTransport(mTransportComponent1);

		assertThat(stats.average).isWithin(TOLERANCE).of(10);
		assertThat(stats.max).isEqualTo(10L);
		assertThat(stats.min).isEqualTo(10L);
		assertThat(stats.n).isEqualTo(1);
		}

		@Test
		public void testMerge() {
		mTransportStats.registerConnectionTime(mTransportComponent1, 10L);
		mTransportStats.registerConnectionTime(mTransportComponent2, 20L);
		Stats stats1 = mTransportStats.getStatsForTransport(mTransportComponent1);
		Stats stats2 = mTransportStats.getStatsForTransport(mTransportComponent2);

		Stats stats = Stats.merge(stats1, stats2);

		assertThat(stats.average).isWithin(TOLERANCE).of(15);
		assertThat(stats.max).isEqualTo(20L);
		assertThat(stats.min).isEqualTo(10L);
		assertThat(stats.n).isEqualTo(2);
		}
		}