105 lines
3.6 KiB
Java
105 lines
3.6 KiB
Java
/*
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* Copyright (c) 2014, 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.vm.lang;
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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.OperationsPerInvocation;
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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 java.io.Serializable;
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import java.util.Date;
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import java.util.concurrent.TimeUnit;
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/**
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* Tests various usages of instanceof.
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*/
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@State(Scope.Thread)
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@Warmup(iterations = 4, time = 2)
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@Measurement(iterations = 4, time = 2)
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@Fork(value = 3)
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public class InstanceOf {
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private static final int NOOFOBJECTS = 100;
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private static final int NULLRATIO = 3;
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public Date[] dateArray;
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public Object[] objectArray;
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@Setup
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public void setup() {
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dateArray = new Date[NOOFOBJECTS * NULLRATIO];
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for (int i = 0; i < NOOFOBJECTS * NULLRATIO; i += NULLRATIO) {
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dateArray[i] = new Date();
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}
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objectArray = dateArray;
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}
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/**
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* Performs "instanceof Cloneable" on objects that definitely are of that interface. It is not clear however whether
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* the objects are null or not, therefore a simple nullcheck is all that should be left of here.
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*/
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@Benchmark
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@OperationsPerInvocation((NOOFOBJECTS * NULLRATIO))
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public int instanceOfInterfacePartialRemove() {
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int dummy = 0;
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Date[] localArray = dateArray;
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for (int i = 0; i < NOOFOBJECTS * NULLRATIO; i++) {
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if (localArray[i] instanceof Cloneable) {
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dummy++;
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}
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}
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return dummy;
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}
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/**
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* Performs three serial instanceof statements on the same object for three different interfaces. The objects are
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* 50% null, and all non-null are instanceof the last interface.
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*/
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@Benchmark
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@OperationsPerInvocation((NOOFOBJECTS * NULLRATIO))
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public int instanceOfInterfaceSerial() {
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int dummy = 0;
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Object[] localArray = objectArray;
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for (int i = 0; i < NOOFOBJECTS * NULLRATIO; i++) {
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if (localArray[i] instanceof Runnable) {
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dummy += 1000;
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} else if (localArray[i] instanceof CharSequence) {
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dummy += 2000;
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} else if (localArray[i] instanceof Serializable) {
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dummy++;
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}
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}
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return dummy;
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}
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}
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