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