263 lines
9.2 KiB
Java
263 lines
9.2 KiB
Java
/*
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* Copyright (c) 2002, 2014, 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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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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package sun.java2d;
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import sun.misc.ThreadGroupUtils;
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import java.lang.ref.Reference;
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import java.lang.ref.ReferenceQueue;
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import java.lang.ref.PhantomReference;
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import java.lang.ref.WeakReference;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.ArrayList;
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import java.util.Hashtable;
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/**
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* This class is used for registering and disposing the native
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* data associated with java objects.
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*
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* The object can register itself by calling one of the addRecord
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* methods and providing either the pointer to the native disposal
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* method or a descendant of the DisposerRecord class with overridden
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* dispose() method.
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*
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* When the object becomes unreachable, the dispose() method
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* of the associated DisposerRecord object will be called.
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*
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* @see DisposerRecord
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*/
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public class Disposer implements Runnable {
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private static final ReferenceQueue queue = new ReferenceQueue();
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private static final Hashtable records = new Hashtable();
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private static Disposer disposerInstance;
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public static final int WEAK = 0;
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public static final int PHANTOM = 1;
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public static int refType = PHANTOM;
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static {
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java.security.AccessController.doPrivileged(
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new java.security.PrivilegedAction<Void>() {
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public Void run() {
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System.loadLibrary("awt");
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return null;
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}
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});
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initIDs();
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String type = (String) java.security.AccessController.doPrivileged(
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new sun.security.action.GetPropertyAction("sun.java2d.reftype"));
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if (type != null) {
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if (type.equals("weak")) {
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refType = WEAK;
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System.err.println("Using WEAK refs");
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} else {
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refType = PHANTOM;
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System.err.println("Using PHANTOM refs");
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}
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}
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disposerInstance = new Disposer();
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AccessController.doPrivileged(
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(PrivilegedAction<Void>) () -> {
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/* The thread must be a member of a thread group
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* which will not get GCed before VM exit.
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* Make its parent the top-level thread group.
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*/
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ThreadGroup rootTG = ThreadGroupUtils.getRootThreadGroup();
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Thread t = new Thread(rootTG, disposerInstance, "Java2D Disposer");
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t.setContextClassLoader(null);
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t.setDaemon(true);
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t.setPriority(Thread.MAX_PRIORITY);
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t.start();
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return null;
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}
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);
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}
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/**
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* Registers the object and the native data for later disposal.
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* @param target Object to be registered
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* @param disposeMethod pointer to the native disposal method
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* @param pData pointer to the data to be passed to the
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* native disposal method
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*/
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public static void addRecord(Object target,
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long disposeMethod, long pData)
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{
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disposerInstance.add(target,
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new DefaultDisposerRecord(disposeMethod, pData));
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}
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/**
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* Registers the object and the native data for later disposal.
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* @param target Object to be registered
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* @param rec the associated DisposerRecord object
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* @see DisposerRecord
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*/
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public static void addRecord(Object target, DisposerRecord rec) {
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disposerInstance.add(target, rec);
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}
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/**
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* Performs the actual registration of the target object to be disposed.
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* @param target Object to be registered, or if target is an instance
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* of DisposerTarget, its associated disposer referent
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* will be the Object that is registered
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* @param rec the associated DisposerRecord object
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* @see DisposerRecord
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*/
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synchronized void add(Object target, DisposerRecord rec) {
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if (target instanceof DisposerTarget) {
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target = ((DisposerTarget)target).getDisposerReferent();
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}
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java.lang.ref.Reference ref;
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if (refType == PHANTOM) {
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ref = new PhantomReference(target, queue);
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} else {
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ref = new WeakReference(target, queue);
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}
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records.put(ref, rec);
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}
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public void run() {
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while (true) {
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try {
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Object obj = queue.remove();
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((Reference)obj).clear();
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DisposerRecord rec = (DisposerRecord)records.remove(obj);
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rec.dispose();
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obj = null;
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rec = null;
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clearDeferredRecords();
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} catch (Exception e) {
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System.out.println("Exception while removing reference.");
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}
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}
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}
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/*
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* This is a marker interface that, if implemented, means it
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* doesn't acquire any special locks, and is safe to
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* be disposed in the poll loop on whatever thread
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* which happens to be the Toolkit thread, is in use.
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*/
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public static interface PollDisposable {
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};
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private static ArrayList<DisposerRecord> deferredRecords = null;
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private static void clearDeferredRecords() {
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if (deferredRecords == null || deferredRecords.isEmpty()) {
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return;
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}
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for (int i=0;i<deferredRecords.size(); i++) {
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try {
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DisposerRecord rec = deferredRecords.get(i);
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rec.dispose();
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} catch (Exception e) {
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System.out.println("Exception while disposing deferred rec.");
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}
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}
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deferredRecords.clear();
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}
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/*
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* Set to indicate the queue is presently being polled.
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*/
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public static volatile boolean pollingQueue = false;
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/*
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* The pollRemove() method is called back from a dispose method
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* that is running on the toolkit thread and wants to
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* dispose any pending refs that are safe to be disposed
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* on that thread.
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*/
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public static void pollRemove() {
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/* This should never be called recursively, so this check
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* is just a safeguard against the unexpected.
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*/
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if (pollingQueue) {
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return;
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}
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Object obj;
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pollingQueue = true;
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int freed = 0;
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int deferred = 0;
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try {
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while ((obj = queue.poll()) != null
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&& freed < 10000 && deferred < 100) {
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freed++;
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((Reference)obj).clear();
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DisposerRecord rec = (DisposerRecord)records.remove(obj);
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if (rec instanceof PollDisposable) {
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rec.dispose();
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obj = null;
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rec = null;
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} else {
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if (rec == null) { // shouldn't happen, but just in case.
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continue;
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}
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deferred++;
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if (deferredRecords == null) {
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deferredRecords = new ArrayList<DisposerRecord>(5);
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}
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deferredRecords.add(rec);
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}
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}
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} catch (Exception e) {
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System.out.println("Exception while removing reference.");
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} finally {
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pollingQueue = false;
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}
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}
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private static native void initIDs();
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/*
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* This was added for use by the 2D font implementation to avoid creation
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* of an additional disposer thread.
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* WARNING: this thread class monitors a specific queue, so a reference
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* added here must have been created with this queue. Failure to do
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* so will clutter the records hashmap and no one will be cleaning up
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* the reference queue.
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*/
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public static void addReference(Reference ref, DisposerRecord rec) {
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records.put(ref, rec);
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}
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public static void addObjectRecord(Object obj, DisposerRecord rec) {
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records.put(new WeakReference(obj, queue) , rec);
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}
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/* This is intended for use in conjunction with addReference(..)
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*/
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public static ReferenceQueue getQueue() {
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return queue;
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}
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}
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