/*

 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

/*

 *

 */

package bench.serial;

import bench.Benchmark;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.io.Serializable;

/**

 * Benchmark for testing speed of reads/writes of repeated objects.

 */

public class RepeatObjs implements Benchmark {

    static class Node implements Serializable {

    }

    /**

     * Write and read repeated objects to/from a stream.  The benchmark is run

     * for a given number of batches.  Within each batch, a set of objects

     * is written to and read from the stream.  The set of objects remains the

     * same between batches (and the serialization streams are not reset) in

     * order to test the speed of object -> wire handle lookup, and vice versa.

     * Arguments: <# objects> <# cycles>

     */

    public long run(String[] args) throws Exception {

        int size = Integer.parseInt(args[0]);

        int nbatches = Integer.parseInt(args[1]);

        Node[] objs = genObjs(size);

        StreamBuffer sbuf = new StreamBuffer();

        ObjectOutputStream oout =

            new ObjectOutputStream(sbuf.getOutputStream());

        ObjectInputStream oin =

            new ObjectInputStream(sbuf.getInputStream());

        doReps(oout, oin, sbuf, objs, 1);       // warmup

        long start = System.currentTimeMillis();

        doReps(oout, oin, sbuf, objs, nbatches);

        return System.currentTimeMillis() - start;

    }

    /**

     * Generate objects.

     */

    Node[] genObjs(int nobjs) {

        Node[] objs = new Node[nobjs];

        for (int i = 0; i < nobjs; i++)

            objs[i] = new Node();

        return objs;

    }

    /**

     * Run benchmark for given number of batches.

     */

    void doReps(ObjectOutputStream oout, ObjectInputStream oin,

                StreamBuffer sbuf, Node[] objs, int nbatches)

        throws Exception

    {

        int nobjs = objs.length;

        for (int i = 0; i < nbatches; i++) {

            sbuf.reset();

            for (int j = 0; j < nobjs; j++) {

                oout.writeObject(objs[j]);

            }

            oout.flush();

            for (int j = 0; j < nobjs; j++) {

                oin.readObject();

            }

        }

    }

}