109 lines
3.4 KiB
Java
109 lines
3.4 KiB
Java
/*
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* Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.openjdk.bench.java.time;
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import org.openjdk.jmh.annotations.Benchmark;
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import org.openjdk.jmh.annotations.BenchmarkMode;
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import org.openjdk.jmh.annotations.Fork;
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import org.openjdk.jmh.annotations.Measurement;
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import org.openjdk.jmh.annotations.Mode;
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import org.openjdk.jmh.annotations.OutputTimeUnit;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.Setup;
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import org.openjdk.jmh.annotations.State;
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import org.openjdk.jmh.annotations.Warmup;
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import org.openjdk.jmh.infra.Blackhole;
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import java.time.Duration;
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import java.time.Instant;
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import java.time.Year;
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import java.time.ZonedDateTime;
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import java.time.chrono.IsoChronology;
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import java.time.temporal.ChronoUnit;
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import java.util.GregorianCalendar;
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import java.util.Random;
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import java.util.concurrent.TimeUnit;
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import java.util.stream.IntStream;
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/**
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* Examine Year.leapYear-related operations
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*/
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@BenchmarkMode(Mode.Throughput)
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@OutputTimeUnit(TimeUnit.MICROSECONDS)
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@Warmup(iterations = 5, time = 1)
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@Measurement(iterations = 5, time = 1)
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@Fork(3)
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@State(Scope.Thread)
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public class LeapYearBench {
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private long[] years;
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private GregorianCalendar calendar;
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@Setup
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public void createInstants() {
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// Large enough number of years to guarantee that the distribution of
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// leap years is reasonably realistic
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years = new long[2048];
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final Random random = new Random(0);
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for (int i = 0; i < years.length; i++) {
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years[i] = random.nextLong(2000) + 2000;
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}
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calendar = GregorianCalendar.from(ZonedDateTime.now());
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}
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@Benchmark
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public void isLeapYear(Blackhole bh) {
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for (long year : years) {
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bh.consume(Year.isLeap(year));
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}
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}
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@Benchmark
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public void isLeapYearChrono(Blackhole bh) {
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for (long year : years) {
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bh.consume(IsoChronology.INSTANCE.isLeapYear(year));
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}
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}
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@Benchmark
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public void isLeapYearGregorian(Blackhole bh) {
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for (long year : years) {
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bh.consume(calendar.isLeapYear((int)year));
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}
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}
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public static boolean isLeapNeriSchneider(long year) {
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int d = year % 100 != 0 ? 4 : 16;
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return (year & (d - 1)) == 0;
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}
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@Benchmark
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public void isLeapYearNS(Blackhole bh) {
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for (long year : years) {
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bh.consume(isLeapNeriSchneider(year));
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}
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}
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}
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