Mercurial > hg > graal-jvmci-8
diff agent/src/share/classes/sun/jvm/hotspot/utilities/ProgressiveHeapVisitor.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/utilities/ProgressiveHeapVisitor.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,70 @@ +/* + * 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(); + } +}