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comparison agent/src/share/classes/sun/jvm/hotspot/oops/ObjectHistogram.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children ba764ed4b6f2
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2000-2005 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.oops;
26
27 import java.io.*;
28 import java.util.*;
29
30 public class ObjectHistogram implements HeapVisitor {
31
32 public ObjectHistogram() { map = new HashMap(); }
33
34 private HashMap map;
35
36 public void prologue(long size) {}
37
38 public boolean doObj(Oop obj) {
39 Klass klass = obj.getKlass();
40 if (!map.containsKey(klass)) map.put(klass, new ObjectHistogramElement(klass));
41 ((ObjectHistogramElement) map.get(klass)).updateWith(obj);
42 return false;
43 }
44
45 public void epilogue() {}
46
47 /** Call this after the iteration is complete to obtain the
48 ObjectHistogramElements in descending order of total heap size
49 consumed in the form of a List<ObjectHistogramElement>. */
50 public List getElements() {
51 List list = new ArrayList();
52 list.addAll(map.values());
53 Collections.sort(list, new Comparator() {
54 public int compare(Object o1, Object o2) {
55 return ((ObjectHistogramElement) o1).compare((ObjectHistogramElement) o2);
56 }
57 });
58 return list;
59 }
60
61 public void print() { printOn(System.out); }
62
63 public void printOn(PrintStream tty) {
64 List list = getElements();
65 ObjectHistogramElement.titleOn(tty);
66 Iterator iterator = list.listIterator();
67 while (iterator.hasNext()) {
68 ((ObjectHistogramElement) iterator.next()).printOn(tty);
69 }
70 }
71 }