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/*
* Copyright (c) 1999, 2008, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.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 writes and reads of a tree of replaceable
* objects.
*/
public class ReplaceTrees implements Benchmark {
static class Node implements Serializable {
Object parent, left, right;
Node(Object parent, Object left, Object right) {
this.parent = parent;
this.left = left;
this.right = right;
}
Node(Object parent, int depth) {
this.parent = parent;
if (depth > 0) {
left = new Node(this, depth - 1);
right = new Node(this, depth - 1);
}
}
Object writeReplace() {
return new RepNode(parent, left, right);
}
}
static class RepNode implements Serializable {
Object parent, left, right;
RepNode(Object parent, Object left, Object right) {
this.parent = parent;
this.left = left;
this.right = right;
}
Object readResolve() {
return new Node(parent, left, right);
}
}
/**
* Write and read a tree of replaceable 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();
}
}
}
}
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