Merge "Add a basic benchmark for android.text.format.Time" am: 9038c723

/*

 * Copyright (C) 2019 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 android.text.format;

import com.google.caliper.Benchmark;

import java.time.LocalDateTime;

import java.time.ZoneId;

import java.time.ZoneOffset;

public class AndroidTimeVsOthersBenchmark {

    private static final String[] TIMEZONE_IDS = {

            "Europe/London",

            "America/Los_Angeles",

            "Asia/Shanghai",

    };

    @Benchmark

    public void toMillis_androidTime(int reps) {

        long answer = 0;

        for (int i = 0; i < reps; i++) {

            String timezoneId = TIMEZONE_IDS[i % TIMEZONE_IDS.length];

            Time time = new Time(timezoneId);

            time.set(1, 2, 3, 4, 5, 2010);

            answer = time.toMillis(false);

        }

        // System.out.println(answer);

    }

    @Benchmark

    public void toMillis_javaTime(int reps) {

        long answer = 0;

        for (int i = 0; i < reps; i++) {

            String timezoneId = TIMEZONE_IDS[i % TIMEZONE_IDS.length];

            LocalDateTime time = LocalDateTime.of(2010, 5 + 1, 4, 3, 2, 1);

            ZoneOffset offset = ZoneId.of(timezoneId).getRules().getOffset(time);

            answer = time.toInstant(offset).toEpochMilli();

        }

        // System.out.println(answer);

    }

    @Benchmark

    public void toMillis_javaUtil(int reps) {

        long answer = 0;

        for (int i = 0; i < reps; i++) {

            String timezoneId = TIMEZONE_IDS[i % TIMEZONE_IDS.length];

            java.util.TimeZone timeZone = java.util.TimeZone.getTimeZone(timezoneId);

            java.util.Calendar calendar = new java.util.GregorianCalendar(timeZone);

            calendar.set(2010, 5, 4, 3, 2, 1);

            calendar.set(java.util.Calendar.MILLISECOND, 0);

            answer = calendar.getTimeInMillis();

        }

        // System.out.println(answer);

    }

    @Benchmark

    public void toMillis_androidIucUtil(int reps) {

        long answer = 0;

        for (int i = 0; i < reps; i++) {

            String timezoneId = TIMEZONE_IDS[i % TIMEZONE_IDS.length];

            android.icu.util.TimeZone timeZone =

                    android.icu.util.TimeZone.getTimeZone(timezoneId);

            android.icu.util.Calendar calendar = new android.icu.util.GregorianCalendar(timeZone);

            calendar.set(2010, 5, 4, 3, 2, 1);

            calendar.set(android.icu.util.Calendar.MILLISECOND, 0);

            answer = calendar.getTimeInMillis();

        }

        // System.out.println(answer);

    }

}