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.vm.lang; 24 25 import org.openjdk.jmh.annotations.Benchmark; 26 import org.openjdk.jmh.annotations.BenchmarkMode; 27 import org.openjdk.jmh.annotations.Mode; 28 import org.openjdk.jmh.annotations.OperationsPerInvocation; 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.io.Serializable; 35 import java.util.Date; 36 import java.util.concurrent.TimeUnit; 37 38 /** 39 * Tests various usages of instanceof. 40 */ 41 @BenchmarkMode(Mode.AverageTime) 42 @OutputTimeUnit(TimeUnit.NANOSECONDS) 43 @State(Scope.Thread) 44 public class InstanceOf { 45 46 private static final int NOOFOBJECTS = 100; 47 private static final int NULLRATIO = 3; 48 49 public Date[] dateArray; 50 public Object[] objectArray; 51 52 @Setup 53 public void setup() { 54 dateArray = new Date[NOOFOBJECTS * NULLRATIO]; 55 for (int i = 0; i < NOOFOBJECTS * NULLRATIO; i += NULLRATIO) { 56 dateArray[i] = new Date(); 57 } 58 objectArray = dateArray; 59 } 60 61 /** 62 * Performs "instanceof Cloneable" on objects that definitely are of that interface. It is not clear however whether 63 * the objects are null or not, therefore a simple nullcheck is all that should be left of here. 64 */ 65 @Benchmark 66 @OperationsPerInvocation((NOOFOBJECTS * NULLRATIO)) 67 public int instanceOfInterfacePartialRemove() { 68 int dummy = 0; 69 Date[] localArray = dateArray; 70 for (int i = 0; i < NOOFOBJECTS * NULLRATIO; i++) { 71 if (localArray[i] instanceof Cloneable) { 72 dummy++; 73 } 74 } 75 return dummy; 76 } 77 78 /** 79 * Performs three serial instanceof statements on the same object for three different interfaces. The objects are 80 * 50% null, and all non-null are instanceof the last interface. 81 */ 82 @Benchmark 83 @OperationsPerInvocation((NOOFOBJECTS * NULLRATIO)) 84 public int instanceOfInterfaceSerial() { 85 int dummy = 0; 86 Object[] localArray = objectArray; 87 for (int i = 0; i < NOOFOBJECTS * NULLRATIO; i++) { 88 if (localArray[i] instanceof Runnable) { 89 dummy += 1000; 90 } else if (localArray[i] instanceof CharSequence) { 91 dummy += 2000; 92 } else if (localArray[i] instanceof Serializable) { 93 dummy++; 94 } 95 } 96 return dummy; 97 } 98 }