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1 /*
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2 * Copyright 2000-2006 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.utilities;
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26
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27 import sun.jvm.hotspot.memory.*;
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28 import sun.jvm.hotspot.oops.*;
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29
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30 /** This class wraps a user's chosen HeapVisitor with the
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31 functionality that a chosen "thunk" is called periodically during
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32 the heap traversal. This allows a progress bar to be displayed
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33 during long heap scans. */
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34
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35 public class ProgressiveHeapVisitor implements HeapVisitor {
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36 private HeapVisitor userHeapVisitor;
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37 private HeapProgressThunk thunk;
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38 private long usedSize;
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39 private long visitedSize;
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40 private double lastNotificationFraction;
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41 private static double MINIMUM_NOTIFICATION_FRACTION = 0.01;
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42
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43 public ProgressiveHeapVisitor(HeapVisitor userHeapVisitor,
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44 HeapProgressThunk thunk) {
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45 this.userHeapVisitor = userHeapVisitor;
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46 this.thunk = thunk;
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47 }
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48
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49 public void prologue(long usedSize) {
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50 this.usedSize = usedSize;
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51 visitedSize = 0;
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52 userHeapVisitor.prologue(usedSize);
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53 }
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54
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55 public boolean doObj(Oop obj) {
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56 userHeapVisitor.doObj(obj);
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57 visitedSize += obj.getObjectSize();
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58 double curFrac = (double) visitedSize / (double) usedSize;
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59 if (curFrac > lastNotificationFraction + MINIMUM_NOTIFICATION_FRACTION) {
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60 thunk.heapIterationFractionUpdate(curFrac);
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61 lastNotificationFraction = curFrac;
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62 }
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63 return false;
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64 }
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65
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66 public void epilogue() {
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67 userHeapVisitor.epilogue();
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68 thunk.heapIterationComplete();
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69 }
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70 }
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