/* 
 * 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 double array reads/writes.
 */
public class DoubleArrays implements Benchmark {
    
    /**
     * Write and read double arrays to/from a stream.  The benchmark is run in
     * batches, with each batch consisting of a fixed number of read/write
     * cycles.  The ObjectOutputStream is reset after each batch of cycles has
     * completed.
     * Arguments: <array size> <# batches> <# cycles per batch>
     */
    public long run(String[] args) throws Exception {
	int size = Integer.parseInt(args[0]);
	int nbatches = Integer.parseInt(args[1]);
	int ncycles = Integer.parseInt(args[2]);
	double[][] arrays = new double[ncycles][size];
	StreamBuffer sbuf = new StreamBuffer();
	ObjectOutputStream oout = 
	    new ObjectOutputStream(sbuf.getOutputStream());
	ObjectInputStream oin = 
	    new ObjectInputStream(sbuf.getInputStream());

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

	long start = System.currentTimeMillis();
	doReps(oout, oin, sbuf, arrays, nbatches);
        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, double[][] arrays, int nbatches)
	throws Exception
    {
	int ncycles = arrays.length;
	for (int i = 0; i < nbatches; i++) {
	    sbuf.reset();
	    oout.reset();
	    for (int j = 0; j < ncycles; j++) {
		oout.writeObject(arrays[j]);
	    }
	    oout.flush();
	    for (int j = 0; j < ncycles; j++) {
		oin.readObject();
	    }
	}
    }
}