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