/*
* Copyright (c) 2012, 2012, 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 test.output;
import java.util.*;
/**
* Simple program to test/demo the capability of the inspector with respect to GC.
* This program makes it easier to set a view on a dead object before first GC.
* Simply set a breakpoint on method entry to the method {@link #setTransientRoot()} and
* open a view on the result of allocated object.
* Then set a breakpoint to the GCOperation's phase of interest and continue.
*/
public class InspectorGCDemo {
static Random rand = new Random(849375698743563L);
static Object root = null;
static void setTransientRoot() {
root = new InspectorGCDemo();
root = null;
}
static private void createGarbage(long nBytes) {
final long arrayHeader = 24;
long n = 0;
while (n < nBytes) {
int s = rand.nextInt(100);
@SuppressWarnings("unused")
byte [] b = new byte[s];
n += arrayHeader + s;
}
}
/**
* @param args
*/
public static void main(String[] args) {
setTransientRoot();
long garbageAmount = 100L << 20;
createGarbage(garbageAmount);
}
}