src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/utilities/ProgressiveHeapVisitor.java
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
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parent 35217 hotspot/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/utilities/ProgressiveHeapVisitor.java@ce4b5303a813
child 51741 ed9b1200dd81
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8187443: Forest Consolidation: Move files to unified layout Reviewed-by: darcy, ihse
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/*
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 * Copyright (c) 2000, 2006, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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package sun.jvm.hotspot.utilities;
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import sun.jvm.hotspot.memory.*;
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import sun.jvm.hotspot.oops.*;
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/** This class wraps a user's chosen HeapVisitor with the
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    functionality that a chosen "thunk" is called periodically during
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    the heap traversal. This allows a progress bar to be displayed
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    during long heap scans. */
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public class ProgressiveHeapVisitor implements HeapVisitor {
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  private HeapVisitor userHeapVisitor;
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  private HeapProgressThunk thunk;
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  private long usedSize;
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  private long visitedSize;
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  private double lastNotificationFraction;
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  private static double MINIMUM_NOTIFICATION_FRACTION = 0.01;
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  public ProgressiveHeapVisitor(HeapVisitor userHeapVisitor,
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                                HeapProgressThunk thunk) {
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    this.userHeapVisitor = userHeapVisitor;
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    this.thunk = thunk;
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  }
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  public void prologue(long usedSize) {
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    this.usedSize = usedSize;
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    visitedSize = 0;
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    userHeapVisitor.prologue(usedSize);
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  }
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  public boolean doObj(Oop obj) {
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    userHeapVisitor.doObj(obj);
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    visitedSize += obj.getObjectSize();
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    double curFrac = (double) visitedSize / (double) usedSize;
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    if (curFrac > lastNotificationFraction + MINIMUM_NOTIFICATION_FRACTION) {
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      thunk.heapIterationFractionUpdate(curFrac);
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      lastNotificationFraction = curFrac;
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    }
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    return false;
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  }
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  public void epilogue() {
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    userHeapVisitor.epilogue();
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    thunk.heapIterationComplete();
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  }
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}