jdk/test/java/rmi/reliability/benchmark/bench/serial/ExternObjTrees.java

/* 
 * 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.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;

/**
 * Benchmark for testing speed of writes and reads of a tree of Externalizable
 * objects.
 */
public class ExternObjTrees implements Benchmark {
    
    static class Node implements Externalizable {
        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);
            }
        }

	public Node() {
	}
	
	public void writeExternal(ObjectOutput out) throws IOException {
	    out.writeBoolean(z);
	    out.writeByte(b);
	    out.writeChar(c);
	    out.writeShort(s);
	    out.writeInt(i);
	    out.writeFloat(f);
	    out.writeLong(j);
	    out.writeDouble(d);
	    out.writeObject(str);
	    out.writeObject(parent);
	    out.writeObject(left);
	    out.writeObject(right);
	}
	
	public void readExternal(ObjectInput in) 
	    throws IOException, ClassNotFoundException
	{
	    z = in.readBoolean();
	    b = in.readByte();
	    c = in.readChar();
	    s = in.readShort();
	    i = in.readInt();
	    f = in.readFloat();
	    j = in.readLong();
	    d = in.readDouble();
	    str = (String) in.readObject();
	    parent = in.readObject();
	    left = in.readObject();
	    right = in.readObject();
	}
    }

    /**
     * Write and read a tree of externalizable 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();
	    }
	}
    }
}