/*

 * 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.util.Random;

/**

 * Benchmark for testing speed of string reads/writes.

 */

public class Strings implements Benchmark {

    /**

     * Write and read strings to/from a stream.  The benchmark is run in

     * batches: each "batch" consists of a fixed number of read/write cycles,

     * and the stream is flushed (and underlying stream buffer cleared) in

     * between each batch.

     * Arguments: <string length> <# batches> <# cycles per batch>

     */

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

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

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

        int ncycles = Integer.parseInt(args[2]);

        String[] strs = genStrings(slen, ncycles);

        StreamBuffer sbuf = new StreamBuffer();

        ObjectOutputStream oout =

            new ObjectOutputStream(sbuf.getOutputStream());

        ObjectInputStream oin =

            new ObjectInputStream(sbuf.getInputStream());

        doReps(oout, oin, sbuf, strs, 1, ncycles);      // warmup

        long start = System.currentTimeMillis();

        doReps(oout, oin, sbuf, strs, nbatches, ncycles);

        return System.currentTimeMillis() - start;

    }

    /**

     * Generate nstrings random strings, each of length len.

     */

    String[] genStrings(int len, int nstrings) {

        String[] strs = new String[nstrings];

        char[] ca = new char[len];

        Random rand = new Random(System.currentTimeMillis());

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

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

                ca[j] = (char) rand.nextInt();

            }

            strs[i] = new String(ca);

        }

        return strs;

    }

    /**

     * Run benchmark for given number of batches, with given number of cycles

     * for each batch.

     */

    void doReps(ObjectOutputStream oout, ObjectInputStream oin,

                StreamBuffer sbuf, String[] strs, int nbatches, int ncycles)

        throws Exception

    {

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

            sbuf.reset();

            oout.reset();

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

                oout.writeObject(strs[j]);

            }

            oout.flush();

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

                oin.readObject();

            }

        }

    }

}