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comparison agent/src/share/classes/sun/jvm/hotspot/utilities/ProgressiveHeapVisitor.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 c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2000-2006 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.utilities;
26
27 import sun.jvm.hotspot.memory.*;
28 import sun.jvm.hotspot.oops.*;
29
30 /** This class wraps a user's chosen HeapVisitor with the
31 functionality that a chosen "thunk" is called periodically during
32 the heap traversal. This allows a progress bar to be displayed
33 during long heap scans. */
34
35 public class ProgressiveHeapVisitor implements HeapVisitor {
36 private HeapVisitor userHeapVisitor;
37 private HeapProgressThunk thunk;
38 private long usedSize;
39 private long visitedSize;
40 private double lastNotificationFraction;
41 private static double MINIMUM_NOTIFICATION_FRACTION = 0.01;
42
43 public ProgressiveHeapVisitor(HeapVisitor userHeapVisitor,
44 HeapProgressThunk thunk) {
45 this.userHeapVisitor = userHeapVisitor;
46 this.thunk = thunk;
47 }
48
49 public void prologue(long usedSize) {
50 this.usedSize = usedSize;
51 visitedSize = 0;
52 userHeapVisitor.prologue(usedSize);
53 }
54
55 public boolean doObj(Oop obj) {
56 userHeapVisitor.doObj(obj);
57 visitedSize += obj.getObjectSize();
58 double curFrac = (double) visitedSize / (double) usedSize;
59 if (curFrac > lastNotificationFraction + MINIMUM_NOTIFICATION_FRACTION) {
60 thunk.heapIterationFractionUpdate(curFrac);
61 lastNotificationFraction = curFrac;
62 }
63 return false;
64 }
65
66 public void epilogue() {
67 userHeapVisitor.epilogue();
68 thunk.heapIterationComplete();
69 }
70 }