1/*
2 * Copyright (c) 2000, 2008, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25package sun.jvm.hotspot.oops;
26
27import java.io.*;
28import java.util.*;
29
30public 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    int num=0;
68    int totalCount=0;
69    int totalSize=0;
70    while (iterator.hasNext()) {
71      ObjectHistogramElement el = (ObjectHistogramElement) iterator.next();
72      num++;
73      totalCount+=el.getCount();
74      totalSize+=el.getSize();
75      tty.print(num + ":" + "\t\t");
76      el.printOn(tty);
77    }
78    tty.println("Total : " + "\t" + totalCount + "\t" + totalSize);
79  }
80}
81