/* 
 * 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.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

/**
 * Benchmark for testing speed of writes and reads of an object tree, where
 * nodes contain explicit writeObject() and readObject() methods which use the
 * GetField()/PutField() API.
 */
public class GetPutFieldTrees implements Benchmark {
    
    static class Node implements Serializable {
        boolean z;
	byte b;
	char c;
	short s;
	int i;
	float f;
	long j;
	double d;
	String str = "bodega";
        Object parent, left, right;
        
        Node(Object parent, int depth) {
            this.parent = parent;
            if (depth > 0) {
                left = new Node(this, depth - 1);
                right = new Node(this, depth - 1);
            }
        }

        private void writeObject(ObjectOutputStream out) throws IOException {
            ObjectOutputStream.PutField fields = out.putFields();
            fields.put("z", z);
            fields.put("b", b);
            fields.put("c", c);
            fields.put("s", s);
            fields.put("i", i);
            fields.put("f", f);
            fields.put("j", j);
            fields.put("d", d);
            fields.put("str", str);
            fields.put("parent", parent);
            fields.put("left", left);
            fields.put("right", right);
            out.writeFields();
        }
        
        private void readObject(ObjectInputStream in) 
            throws IOException, ClassNotFoundException
        {
            ObjectInputStream.GetField fields = in.readFields();
	    z = fields.get("z", false);
	    b = fields.get("b", (byte) 0);
	    c = fields.get("c", (char) 0);
	    s = fields.get("s", (short) 0);
	    i = fields.get("i", (int) 0);
	    f = fields.get("f", (float) 0.0);
	    j = fields.get("j", (long) 0);
	    d = fields.get("d", (double) 0.0);
            str = (String) fields.get("str", null);
            parent = fields.get("parent", null);
            left = fields.get("left", null);
            right = fields.get("right", null);
        }
    }

    /**
     * Write and read a tree of objects 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: <tree depth> <# batches> <# cycles per batch>
     */
    public long run(String[] args) throws Exception {
	int depth = Integer.parseInt(args[0]);
	int nbatches = Integer.parseInt(args[1]);
	int ncycles = Integer.parseInt(args[2]);
	Node[] trees = genTrees(depth, ncycles);
	StreamBuffer sbuf = new StreamBuffer();
	ObjectOutputStream oout = 
	    new ObjectOutputStream(sbuf.getOutputStream());
	ObjectInputStream oin = 
	    new ObjectInputStream(sbuf.getInputStream());
	
	doReps(oout, oin, sbuf, trees, 1);	// warmup

	long start = System.currentTimeMillis();
	doReps(oout, oin, sbuf, trees, nbatches);
        return System.currentTimeMillis() - start;
    }

    /**
     * Generate object trees.
     */
    Node[] genTrees(int depth, int ntrees) {
	Node[] trees = new Node[ntrees];
	for (int i = 0; i < ntrees; i++) {
	    trees[i] = new Node(null, depth);
	}
	return trees;
    }

    /**
     * Run benchmark for given number of batches, with each batch containing 
     * the given number of cycles.
     */
    void doReps(ObjectOutputStream oout, ObjectInputStream oin,
	        StreamBuffer sbuf, Node[] trees, int nbatches)
	throws Exception
    {
	int ncycles = trees.length;
	for (int i = 0; i < nbatches; i++) {
	    sbuf.reset();
	    oout.reset();
	    for (int j = 0; j < ncycles; j++) {
		oout.writeObject(trees[j]);
	    }
	    oout.flush();
	    for (int j = 0; j < ncycles; j++) {
		oin.readObject();
	    }
	}
    }
}