1 /* 2 * Copyright (c) 2020, 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; 24 25 import java.util.UUID; 26 import java.util.concurrent.TimeUnit; 27 28 import org.openjdk.jmh.annotations.*; 29 30 @State(Scope.Thread) 31 @OutputTimeUnit(TimeUnit.MICROSECONDS) 32 @Fork(value = 3) 33 @Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS) 34 @Measurement(iterations = 5, time = 2, timeUnit = TimeUnit.SECONDS) 35 public class UUIDBench { 36 37 @Param("20000") 38 private int size; 39 40 private UUID[] uuids; 41 42 private String[] uuidStrings; 43 44 private int index = 0; 45 46 @Setup 47 public void setup() { 48 uuids = new UUID[size]; 49 uuidStrings = new String[size]; 50 for (int i = 0; i < this.uuidStrings.length; i++) { 51 final UUID uuid = UUID.randomUUID(); 52 53 this.uuids[i] = uuid; 54 this.uuidStrings[i] = uuid.toString(); 55 } 56 } 57 58 @Setup(Level.Iteration) 59 public void setupIteration() { 60 index++; 61 if (index >= size) { 62 index = 0; 63 } 64 } 65 66 @Benchmark 67 public UUID fromString() { 68 return UUID.fromString(uuidStrings[index]); 69 } 70 71 @Benchmark 72 public String toString() { 73 return uuids[index].toString(); 74 } 75 }