/* 
 * 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;
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();
	    }
	}
    }
}