Ray Greenwell
174d0ac3ad
which makes sense when you think about it, so we now increment the instance when an object is cloned or created. git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3107 542714f4-19e9-0310-aa3c-eee0fc999fb1
111 lines
3.7 KiB
Java
111 lines
3.7 KiB
Java
//
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// $Id: TrackedObject.java,v 1.6 2004/08/28 01:23:31 ray Exp $
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//
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// Narya library - tools for developing networked games
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// Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
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// http://www.threerings.net/code/narya/
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package com.threerings.util;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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import com.samskivert.util.Tuple;
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/**
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* Used to perform rudimentary memory profiling on large, running systems
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* where it is impractical to operate a real profiler. Instances of {@link
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* TrackedObject} record their existence when constructed and their
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* destruction when finalized which, combined with periodic queries of the
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* current total object count (by class) logged and graphed (gnuplot is
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* your friend), can provide an indication of systems that are improperly
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* retaining references.
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*/
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public class TrackedObject
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{
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// instance initializer - called whenever an instance is constructed
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{
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incrementInstanceCount();
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}
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// documentation inherited
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protected Object clone ()
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throws CloneNotSupportedException
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{
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Object o = super.clone();
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incrementInstanceCount();
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return o;
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}
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/** Records that this object came into existence. */
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protected final void incrementInstanceCount ()
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{
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Class clazz = getClass();
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synchronized (_map) {
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int[] count = (int[])_map.get(clazz);
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if (count == null) {
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_map.put(clazz, count = new int[1]);
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}
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count[0]++;
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}
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}
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/** Records that this object was collected. */
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protected void finalize ()
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throws Throwable
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{
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Class clazz = getClass();
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synchronized (_map) {
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int[] count = (int[])_map.get(clazz);
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if (count != null) {
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count[0]--;
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} else {
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Log.warning("Finalized TrackedObject missing counter! " +
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"[class=" + clazz + "].");
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}
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}
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super.finalize();
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}
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/**
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* Returns a {@link Tuple} containing an array of {@link Class}
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* instances and an <code>int[]</code> array that represent the number
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* of outstanding instance of all {@link TrackedObject}s in the VM.
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*/
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public static Tuple getSnapshot ()
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{
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Class[] classes = null;
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int[] counts = null;
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synchronized (_map) {
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classes = new Class[_map.size()];
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counts = new int[_map.size()];
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Iterator iter = _map.entrySet().iterator();
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for (int ii = 0; iter.hasNext(); ii++) {
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Map.Entry entry = (Map.Entry)iter.next();
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classes[ii] = (Class)entry.getKey();
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counts[ii] = ((int[])entry.getValue())[0];
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}
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}
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return new Tuple(classes, counts);
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}
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/** Tracks a mapping from {@link Class} object to active count. */
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protected static HashMap _map = new HashMap();
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}
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