/*

 * Copyright (c) 2014 Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package org.openjdk.bench.java.io;

import org.openjdk.jmh.annotations.Benchmark;

import org.openjdk.jmh.annotations.BenchmarkMode;

import org.openjdk.jmh.annotations.Mode;

import org.openjdk.jmh.annotations.OutputTimeUnit;

import org.openjdk.jmh.annotations.Scope;

import org.openjdk.jmh.annotations.Setup;

import org.openjdk.jmh.annotations.State;

import org.openjdk.jmh.infra.Blackhole;

import java.io.ObjectStreamClass;

import java.io.Serializable;

import java.util.LinkedList;

import java.util.concurrent.TimeUnit;

/**

 * A micro benchmark used to measure the performance impact from multi threaded access to ObjectStreamClass.

 */

@BenchmarkMode(Mode.AverageTime)

@OutputTimeUnit(TimeUnit.NANOSECONDS)

@State(Scope.Thread)

public class ObjectStreamClasses {

    public Class<?>[] classes;

    @Setup

    public void setup() {

        LinkedList<Class> queue = new LinkedList<Class>();

        int i = 0;

        while (true) {

            // Loop until we get a ClassNotFoundException

            // Maybe rewrite this considering the fact that there are 29

            // inner classes available?

            try {

                Class clazz = Class.forName(ObjectStreamClasses.class.getName() + "$SerializableClass" + i++);

                queue.add(clazz);

            } catch (ClassNotFoundException e) {

                break;

            }

        }

        classes = new Class[queue.size()];

        // Make ObjectStreamClass load all classes into the static map

        i = 0;

        while (!queue.isEmpty()) {

            classes[i] = (Class) queue.remove();

            i++;

        }

    }

    /**

     * Tests the static lookup function. Depending on JRE version the internal behavior is different but the general

     * behavior is a synchronized call to some sort of static container.

     */

    @Benchmark

    public void testLookup(Blackhole bh) {

        for (Class<?> klass : classes) {

            bh.consume(ObjectStreamClass.lookup(klass));

        }

    }

    static class SerializableClass0 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass1 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass2 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass3 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass4 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass5 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass6 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass7 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass8 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass9 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass10 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass11 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass12 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass13 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass14 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass15 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass16 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass17 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass18 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass19 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass20 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass21 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass22 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass23 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass24 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass25 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass26 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass27 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass28 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    static class SerializableClass29 extends SerializableClass {

        private static final long serialVersionUID = 1L;

    }

    @SuppressWarnings("unused")

    private static class SerializableClass implements Serializable {

        private static final long serialVersionUID = 6107539118220989250L;

        public Object objectField00 = new Object();

        public Object objectField01 = new Object();

        public Object objectField02 = new Object();

        public Object objectField03 = new Object();

        public Object objectField04 = new Object();

        public Object objectField05 = new Object();

        public Object objectField06 = new Object();

        public Object objectField07 = new Object();

        public Object objectField08 = new Object();

        public Object objectField09 = new Object();

        public Object objectField10 = new Object();

        public Object objectField11 = new Object();

        public Object objectField12 = new Object();

        public Object objectField13 = new Object();

        public Object objectField14 = new Object();

        public Object objectField15 = new Object();

        public Object objectField16 = new Object();

        public Object objectField17 = new Object();

        public Object objectField18 = new Object();

        public Object objectField19 = new Object();

        public Object objectField20 = new Object();

        public Object objectField21 = new Object();

        public Object objectField22 = new Object();

        public Object objectField23 = new Object();

        public Object objectField24 = new Object();

        public Object objectField25 = new Object();

        public Object objectField26 = new Object();

        public Object objectField27 = new Object();

        public Object objectField28 = new Object();

        public Object objectField29 = new Object();

        SerializableClass() {

            super();

        }

    }

}