| /******************************************************************************* |
| * Copyright (c) 2004, 2007 Boeing. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Boeing - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.osee.ote.core; |
| |
| import java.lang.ref.WeakReference; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.TreeSet; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.logging.Level; |
| |
| import org.eclipse.osee.framework.logging.OseeLog; |
| |
| /** |
| * @author Andrew M. Finkbeiner |
| */ |
| public class GCHelper { |
| |
| private static boolean enableGcHelper = Boolean.parseBoolean(System.getProperty("ote.gc.helper", "false")); |
| |
| private final ConcurrentHashMap<String, WeakReference<Object>> map; |
| private static GCHelper singleton; |
| |
| public GCHelper() { |
| super(); |
| map = new ConcurrentHashMap<>(1024); |
| } |
| |
| public static GCHelper getGCHelper() { |
| if (singleton == null) { |
| singleton = new GCHelper(); |
| } |
| return singleton; |
| } |
| |
| public void addRefWatch(Object obj) { |
| if(enableGcHelper){ |
| String key = obj.toString() + " [ " + obj.hashCode() + " ] "; |
| map.put(key, new WeakReference<Object>(obj)); |
| } |
| } |
| |
| public void printLiveReferences() { |
| |
| StringBuilder builder = new StringBuilder(8000); |
| if(!enableGcHelper){ |
| builder.append("GCHelper disabled. Enable with '-Dote.gc.helper=true'\n"); |
| } |
| writeGCResults(builder); |
| OseeLog.log(GCHelper.class, Level.INFO, builder.toString()); |
| } |
| |
| public void writeGCResults(StringBuilder builder) { |
| TreeSet<String> live = new TreeSet<>(); |
| System.gc(); |
| for (Map.Entry<String, WeakReference<Object>> entry : map.entrySet()) { |
| if (entry.getValue().get() != null) { |
| entry.getValue().get(); |
| live.add(entry.getKey()); |
| } |
| } |
| |
| builder.append("Live References:\n"); |
| for (String key : live) { |
| builder.append(" "); |
| builder.append(key); |
| builder.append("\n"); |
| } |
| } |
| |
| public List getInstancesOfType(Class type) { |
| List<Object> listOfObjects = new ArrayList<>(); |
| System.gc(); |
| for (Map.Entry<String, WeakReference<Object>> entry : map.entrySet()) { |
| if (entry.getValue().get() != null) { |
| if (type.isInstance(entry.getValue().get())) { |
| listOfObjects.add(entry.getValue().get()); |
| } |
| } |
| } |
| return listOfObjects; |
| } |
| |
| public void collectGarbage() { |
| long memBefore = Runtime.getRuntime().freeMemory(); |
| long timeBefore = System.currentTimeMillis(); |
| Runtime.getRuntime().runFinalization(); |
| Runtime.getRuntime().gc(); |
| System.out.println("Garbage Collection --- Memory Released: " + (Runtime.getRuntime().freeMemory() - memBefore) + " -- Time Elapsed: " + (System.currentTimeMillis() - timeBefore)); |
| } |
| |
| public void collectGarbageAndPrintStats() { |
| new Thread(new Runnable() { |
| |
| @Override |
| public void run() { |
| try { |
| Thread.sleep(5000); |
| collectGarbage(); |
| printLiveReferences(); |
| } catch (InterruptedException ex) { |
| } |
| |
| } |
| |
| }).start(); |
| } |
| |
| } |