1 /* 2 * Copyright (c) 2016, 2018, 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.valhalla.sandbox.corelibs.corelibs.mapprotos; 24 25 import org.openjdk.jmh.annotations.Benchmark; 26 import org.openjdk.jmh.annotations.CompilerControl; 27 import org.openjdk.jmh.annotations.Setup; 28 import org.openjdk.jmh.annotations.State; 29 30 import java.util.Iterator; 31 import java.util.HashMap; 32 import java.util.Map; 33 import java.util.function.IntFunction; 34 35 public class WalkX extends MapBase { 36 37 IntFunction<Map<Integer, Integer>> mapSupplier; 38 Map<Integer, Integer> map; 39 40 @Setup 41 public void setup() { 42 super.init(size); 43 try { 44 Class<?> mapClass = Class.forName(mapType); 45 mapSupplier = (size) -> newInstance(mapClass, size); 46 } catch (Exception ex) { 47 System.out.printf("%s: %s%n", mapType, ex.getMessage()); 48 return; 49 } 50 51 map = mapSupplier.apply(0); 52 for (Integer k : keys) { 53 map.put(k, k); 54 } 55 } 56 57 Map<Integer, Integer> newInstance(Class<?> mapClass, int size) { 58 try { 59 return (Map<Integer, Integer>)mapClass.getConstructor(int.class).newInstance(size); 60 } catch (Exception ex) { 61 throw new RuntimeException("failed", ex); 62 } 63 } 64 65 @Benchmark 66 public int sumIterator() { 67 int s = 0; 68 for (Iterator<Integer> iterator = map.keySet().iterator(); iterator.hasNext(); ) { 69 s += iterator.next(); 70 } 71 return s; 72 } 73 74 @Benchmark 75 public int sumIteratorHidden() { 76 int s = 0; 77 for (Iterator<Integer> iterator = hide(map.keySet().iterator()); iterator.hasNext(); ) { 78 s += iterator.next(); 79 } 80 return s; 81 } 82 83 @CompilerControl(CompilerControl.Mode.DONT_INLINE) 84 private static Iterator<Integer> hide(Iterator<Integer> it) { 85 return it; 86 } 87 88 }