/* 

 * Copyright 1999 Sun Microsystems, Inc.  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 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;

/**

 * Benchmark for testing speed of byte reads/writes.

 */

public class Bytes implements Benchmark {

    /**

     * Write and read byte values 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: <# batches> <# cycles per batch>

     */

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

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

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

	StreamBuffer sbuf = new StreamBuffer();

	ObjectOutputStream oout = 

	    new ObjectOutputStream(sbuf.getOutputStream());

	ObjectInputStream oin =

	    new ObjectInputStream(sbuf.getInputStream());

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

	long start = System.currentTimeMillis();

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

        return System.currentTimeMillis() - start;

    }

    /**

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

     * for each batch.

     */

    void doReps(ObjectOutputStream oout, ObjectInputStream oin,

	        StreamBuffer sbuf, int nbatches, int ncycles)

	throws Exception

    {

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

	    sbuf.reset();

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

		oout.writeByte(0);

	    }

	    oout.flush();

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

		oin.readByte();

	    }

	}

    }

}