Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/utilities/ProgressiveHeapVisitor.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | c18cbe5936b8 |
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/* * Copyright 2000-2006 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ package sun.jvm.hotspot.utilities; import sun.jvm.hotspot.memory.*; import sun.jvm.hotspot.oops.*; /** This class wraps a user's chosen HeapVisitor with the functionality that a chosen "thunk" is called periodically during the heap traversal. This allows a progress bar to be displayed during long heap scans. */ public class ProgressiveHeapVisitor implements HeapVisitor { private HeapVisitor userHeapVisitor; private HeapProgressThunk thunk; private long usedSize; private long visitedSize; private double lastNotificationFraction; private static double MINIMUM_NOTIFICATION_FRACTION = 0.01; public ProgressiveHeapVisitor(HeapVisitor userHeapVisitor, HeapProgressThunk thunk) { this.userHeapVisitor = userHeapVisitor; this.thunk = thunk; } public void prologue(long usedSize) { this.usedSize = usedSize; visitedSize = 0; userHeapVisitor.prologue(usedSize); } public boolean doObj(Oop obj) { userHeapVisitor.doObj(obj); visitedSize += obj.getObjectSize(); double curFrac = (double) visitedSize / (double) usedSize; if (curFrac > lastNotificationFraction + MINIMUM_NOTIFICATION_FRACTION) { thunk.heapIterationFractionUpdate(curFrac); lastNotificationFraction = curFrac; } return false; } public void epilogue() { userHeapVisitor.epilogue(); thunk.heapIterationComplete(); } }