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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 | } | ||