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| 1 | +/* | |
| 2 | + * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.java2d; | |
| 27 | + | |
| 28 | +import java.lang.ref.Reference; | |
| 29 | +import java.lang.ref.ReferenceQueue; | |
| 30 | +import java.lang.ref.PhantomReference; | |
| 31 | +import java.lang.ref.WeakReference; | |
| 32 | +import java.util.ArrayList; | |
| 33 | +import java.util.Hashtable; | |
| 34 | + | |
| 35 | +/** | |
| 36 | + * This class is used for registering and disposing the native | |
| 37 | + * data associated with java objects. | |
| 38 | + * | |
| 39 | + * The object can register itself by calling one of the addRecord | |
| 40 | + * methods and providing either the pointer to the native disposal | |
| 41 | + * method or a descendant of the DisposerRecord class with overridden | |
| 42 | + * dispose() method. | |
| 43 | + * | |
| 44 | + * When the object becomes unreachable, the dispose() method | |
| 45 | + * of the associated DisposerRecord object will be called. | |
| 46 | + * | |
| 47 | + * @see DisposerRecord | |
| 48 | + */ | |
| 49 | +public class Disposer implements Runnable { | |
| 50 | + private static final ReferenceQueue queue = new ReferenceQueue(); | |
| 51 | + private static final Hashtable records = new Hashtable(); | |
| 52 | + | |
| 53 | + private static Disposer disposerInstance; | |
| 54 | + public static final int WEAK = 0; | |
| 55 | + public static final int PHANTOM = 1; | |
| 56 | + public static int refType = PHANTOM; | |
| 57 | + | |
| 58 | + static { | |
| 59 | + java.security.AccessController.doPrivileged( | |
| 60 | + new sun.security.action.LoadLibraryAction("awt")); | |
| 61 | + initIDs(); | |
| 62 | + String type = (String) java.security.AccessController.doPrivileged( | |
| 63 | + new sun.security.action.GetPropertyAction("sun.java2d.reftype")); | |
| 64 | + if (type != null) { | |
| 65 | + if (type.equals("weak")) { | |
| 66 | + refType = WEAK; | |
| 67 | + System.err.println("Using WEAK refs"); | |
| 68 | + } else { | |
| 69 | + refType = PHANTOM; | |
| 70 | + System.err.println("Using PHANTOM refs"); | |
| 71 | + } | |
| 72 | + } | |
| 73 | + disposerInstance = new Disposer(); | |
| 74 | + java.security.AccessController.doPrivileged( | |
| 75 | + new java.security.PrivilegedAction() { | |
| 76 | + public Object run() { | |
| 77 | + /* The thread must be a member of a thread group | |
| 78 | + * which will not get GCed before VM exit. | |
| 79 | + * Make its parent the top-level thread group. | |
| 80 | + */ | |
| 81 | + ThreadGroup tg = Thread.currentThread().getThreadGroup(); | |
| 82 | + for (ThreadGroup tgn = tg; | |
| 83 | + tgn != null; | |
| 84 | + tg = tgn, tgn = tg.getParent()); | |
| 85 | + Thread t = | |
| 86 | + new Thread(tg, disposerInstance, "Java2D Disposer"); | |
| 87 | + t.setContextClassLoader(null); | |
| 88 | + t.setDaemon(true); | |
| 89 | + t.setPriority(Thread.MAX_PRIORITY); | |
| 90 | + t.start(); | |
| 91 | + return null; | |
| 92 | + } | |
| 93 | + } | |
| 94 | + ); | |
| 95 | + } | |
| 96 | + | |
| 97 | + /** | |
| 98 | + * Registers the object and the native data for later disposal. | |
| 99 | + * @param target Object to be registered | |
| 100 | + * @param disposeMethod pointer to the native disposal method | |
| 101 | + * @param pData pointer to the data to be passed to the | |
| 102 | + * native disposal method | |
| 103 | + */ | |
| 104 | + public static void addRecord(Object target, | |
| 105 | + long disposeMethod, long pData) | |
| 106 | + { | |
| 107 | + disposerInstance.add(target, | |
| 108 | + new DefaultDisposerRecord(disposeMethod, pData)); | |
| 109 | + } | |
| 110 | + | |
| 111 | + /** | |
| 112 | + * Registers the object and the native data for later disposal. | |
| 113 | + * @param target Object to be registered | |
| 114 | + * @param rec the associated DisposerRecord object | |
| 115 | + * @see DisposerRecord | |
| 116 | + */ | |
| 117 | + public static void addRecord(Object target, DisposerRecord rec) { | |
| 118 | + disposerInstance.add(target, rec); | |
| 119 | + } | |
| 120 | + | |
| 121 | + /** | |
| 122 | + * Performs the actual registration of the target object to be disposed. | |
| 123 | + * @param target Object to be registered, or if target is an instance | |
| 124 | + * of DisposerTarget, its associated disposer referent | |
| 125 | + * will be the Object that is registered | |
| 126 | + * @param rec the associated DisposerRecord object | |
| 127 | + * @see DisposerRecord | |
| 128 | + */ | |
| 129 | + synchronized void add(Object target, DisposerRecord rec) { | |
| 130 | + if (target instanceof DisposerTarget) { | |
| 131 | + target = ((DisposerTarget)target).getDisposerReferent(); | |
| 132 | + } | |
| 133 | + java.lang.ref.Reference ref; | |
| 134 | + if (refType == PHANTOM) { | |
| 135 | + ref = new PhantomReference(target, queue); | |
| 136 | + } else { | |
| 137 | + ref = new WeakReference(target, queue); | |
| 138 | + } | |
| 139 | + records.put(ref, rec); | |
| 140 | + } | |
| 141 | + | |
| 142 | + public void run() { | |
| 143 | + while (true) { | |
| 144 | + try { | |
| 145 | + Object obj = queue.remove(); | |
| 146 | + ((Reference)obj).clear(); | |
| 147 | + DisposerRecord rec = (DisposerRecord)records.remove(obj); | |
| 148 | + rec.dispose(); | |
| 149 | + obj = null; | |
| 150 | + rec = null; | |
| 151 | + clearDeferredRecords(); | |
| 152 | + } catch (Exception e) { | |
| 153 | + System.out.println("Exception while removing reference: " + e); | |
| 154 | + e.printStackTrace(); | |
| 155 | + } | |
| 156 | + } | |
| 157 | + } | |
| 158 | + | |
| 159 | + /* | |
| 160 | + * This is a marker interface that, if implemented, means it | |
| 161 | + * doesn't acquire any special locks, and is safe to | |
| 162 | + * be disposed in the poll loop on whatever thread | |
| 163 | + * which happens to be the Toolkit thread, is in use. | |
| 164 | + */ | |
| 165 | + public static interface PollDisposable { | |
| 166 | + }; | |
| 167 | + | |
| 168 | + private static ArrayList<DisposerRecord> deferredRecords = null; | |
| 169 | + | |
| 170 | + private static void clearDeferredRecords() { | |
| 171 | + if (deferredRecords == null || deferredRecords.isEmpty()) { | |
| 172 | + return; | |
| 173 | + } | |
| 174 | + for (int i=0;i<deferredRecords.size(); i++) { | |
| 175 | + try { | |
| 176 | + DisposerRecord rec = deferredRecords.get(i); | |
| 177 | + rec.dispose(); | |
| 178 | + } catch (Exception e) { | |
| 179 | + System.out.println("Exception while disposing deferred rec."); | |
| 180 | + e.printStackTrace(); | |
| 181 | + } | |
| 182 | + } | |
| 183 | + deferredRecords.clear(); | |
| 184 | + } | |
| 185 | + | |
| 186 | + /* | |
| 187 | + * Set to indicate the queue is presently being polled. | |
| 188 | + */ | |
| 189 | + public static volatile boolean pollingQueue = false; | |
| 190 | + | |
| 191 | + /* | |
| 192 | + * The pollRemove() method is called back from a dispose method | |
| 193 | + * that is running on the toolkit thread and wants to | |
| 194 | + * dispose any pending refs that are safe to be disposed | |
| 195 | + * on that thread. | |
| 196 | + */ | |
| 197 | + public static void pollRemove() { | |
| 198 | + | |
| 199 | + /* This should never be called recursively, so this check | |
| 200 | + * is just a safeguard against the unexpected. | |
| 201 | + */ | |
| 202 | + if (pollingQueue) { | |
| 203 | + return; | |
| 204 | + } | |
| 205 | + Object obj; | |
| 206 | + pollingQueue = true; | |
| 207 | + int freed = 0; | |
| 208 | + int deferred = 0; | |
| 209 | + try { | |
| 210 | + while ((obj = queue.poll()) != null | |
| 211 | + && freed < 10000 && deferred < 100) { | |
| 212 | + freed++; | |
| 213 | + ((Reference)obj).clear(); | |
| 214 | + DisposerRecord rec = (DisposerRecord)records.remove(obj); | |
| 215 | + if (rec instanceof PollDisposable) { | |
| 216 | + rec.dispose(); | |
| 217 | + obj = null; | |
| 218 | + rec = null; | |
| 219 | + } else { | |
| 220 | + if (rec == null) { // shouldn't happen, but just in case. | |
| 221 | + continue; | |
| 222 | + } | |
| 223 | + deferred++; | |
| 224 | + if (deferredRecords == null) { | |
| 225 | + deferredRecords = new ArrayList<DisposerRecord>(5); | |
| 226 | + } | |
| 227 | + deferredRecords.add(rec); | |
| 228 | + } | |
| 229 | + } | |
| 230 | + } catch (Exception e) { | |
| 231 | + System.out.println("Exception while removing reference: " + e); | |
| 232 | + e.printStackTrace(); | |
| 233 | + } finally { | |
| 234 | + pollingQueue = false; | |
| 235 | + } | |
| 236 | + } | |
| 237 | + | |
| 238 | + private static native void initIDs(); | |
| 239 | + | |
| 240 | + /* | |
| 241 | + * This was added for use by the 2D font implementation to avoid creation | |
| 242 | + * of an additional disposer thread. | |
| 243 | + * WARNING: this thread class monitors a specific queue, so a reference | |
| 244 | + * added here must have been created with this queue. Failure to do | |
| 245 | + * so will clutter the records hashmap and no one will be cleaning up | |
| 246 | + * the reference queue. | |
| 247 | + */ | |
| 248 | + public static void addReference(Reference ref, DisposerRecord rec) { | |
| 249 | + records.put(ref, rec); | |
| 250 | + } | |
| 251 | + | |
| 252 | + public static void addObjectRecord(Object obj, DisposerRecord rec) { | |
| 253 | + records.put(new WeakReference(obj, queue) , rec); | |
| 254 | + } | |
| 255 | + | |
| 256 | + /* This is intended for use in conjunction with addReference(..) | |
| 257 | + */ | |
| 258 | + public static ReferenceQueue getQueue() { | |
| 259 | + return queue; | |
| 260 | + } | |
| 261 | + | |
| 262 | +} | |