1 /* 2 * Copyright (c) 2014 Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.openjdk.bench.java.util.stream.tasks.IntegerMax; 24 25 import org.openjdk.jmh.annotations.Benchmark; 26 import org.openjdk.jmh.annotations.BenchmarkMode; 27 import org.openjdk.jmh.annotations.Level; 28 import org.openjdk.jmh.annotations.Mode; 29 import org.openjdk.jmh.annotations.OutputTimeUnit; 30 import org.openjdk.jmh.annotations.Scope; 31 import org.openjdk.jmh.annotations.Setup; 32 import org.openjdk.jmh.annotations.State; 33 34 import java.util.Arrays; 35 import java.util.concurrent.TimeUnit; 36 37 /** 38 * Bulk scenario: search for max value in array. 39 * 40 * This test covers lambda-specific solutions for the problem. 41 */ 42 @BenchmarkMode(Mode.Throughput) 43 @OutputTimeUnit(TimeUnit.SECONDS) 44 @State(Scope.Benchmark) 45 public class Lambda { 46 47 private IntegerMaxProblem problem; 48 49 @Setup(Level.Trial) 50 public void populateData(){ 51 problem = new IntegerMaxProblem(); 52 } 53 54 public static Integer maxInt(Integer l, Integer r) { 55 return l > r ? l : r; 56 } 57 58 @Benchmark 59 public int bulk_seq_lambda() { 60 return Arrays.stream(problem.get()).reduce(Integer.MIN_VALUE, (l, r) -> l > r ? l : r); 61 } 62 63 @Benchmark 64 public int bulk_seq_methodRef() { 65 return Arrays.stream(problem.get()).reduce(Integer.MIN_VALUE, Lambda::maxInt); 66 } 67 68 @Benchmark 69 public int bulk_par_lambda() { 70 return Arrays.stream(problem.get()).parallel().reduce(Integer.MIN_VALUE, (l, r) -> l > r ? l : r); 71 } 72 73 @Benchmark 74 public int bulk_par_methodRef() { 75 return Arrays.stream(problem.get()).parallel().reduce(Integer.MIN_VALUE, Lambda::maxInt); 76 } 77 78 }