0N/A/*
2362N/A * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2362N/A * or visit www.oracle.com if you need additional information or have any
2362N/A * questions.
0N/A */
0N/A
0N/Apackage com.sun.imageio.stream;
0N/A
0N/Aimport java.io.IOException;
0N/Aimport java.util.Set;
0N/Aimport java.util.WeakHashMap;
0N/Aimport javax.imageio.stream.ImageInputStream;
0N/A
0N/A/**
0N/A * This class provide means to properly close hanging
0N/A * image input/output streams on VM shutdown.
0N/A * This might be useful for proper cleanup such as removal
0N/A * of temporary files.
0N/A *
0N/A * Addition of stream do not prevent it from being garbage collected
0N/A * if no other references to it exists. Stream can be closed
0N/A * explicitly without removal from StreamCloser queue.
0N/A * Explicit removal from the queue only helps to save some memory.
0N/A */
0N/Apublic class StreamCloser {
0N/A
1501N/A private static WeakHashMap<CloseAction, Object> toCloseQueue;
0N/A private static Thread streamCloser;
0N/A
1501N/A public static void addToQueue(CloseAction ca) {
0N/A synchronized (StreamCloser.class) {
0N/A if (toCloseQueue == null) {
0N/A toCloseQueue =
1501N/A new WeakHashMap<CloseAction, Object>();
0N/A }
0N/A
1501N/A toCloseQueue.put(ca, null);
0N/A
0N/A if (streamCloser == null) {
0N/A final Runnable streamCloserRunnable = new Runnable() {
0N/A public void run() {
0N/A if (toCloseQueue != null) {
0N/A synchronized (StreamCloser.class) {
1501N/A Set<CloseAction> set =
0N/A toCloseQueue.keySet();
0N/A // Make a copy of the set in order to avoid
0N/A // concurrent modification (the is.close()
0N/A // will in turn call removeFromQueue())
1501N/A CloseAction[] actions =
1501N/A new CloseAction[set.size()];
1501N/A actions = set.toArray(actions);
1501N/A for (CloseAction ca : actions) {
1501N/A if (ca != null) {
0N/A try {
1501N/A ca.performAction();
0N/A } catch (IOException e) {
0N/A }
0N/A }
0N/A }
0N/A }
0N/A }
0N/A }
0N/A };
0N/A
0N/A java.security.AccessController.doPrivileged(
0N/A new java.security.PrivilegedAction() {
0N/A public Object run() {
0N/A /* The thread must be a member of a thread group
0N/A * which will not get GCed before VM exit.
0N/A * Make its parent the top-level thread group.
0N/A */
0N/A ThreadGroup tg =
0N/A Thread.currentThread().getThreadGroup();
0N/A for (ThreadGroup tgn = tg;
0N/A tgn != null;
0N/A tg = tgn, tgn = tg.getParent());
0N/A streamCloser = new Thread(tg, streamCloserRunnable);
985N/A /* Set context class loader to null in order to avoid
985N/A * keeping a strong reference to an application classloader.
985N/A */
985N/A streamCloser.setContextClassLoader(null);
0N/A Runtime.getRuntime().addShutdownHook(streamCloser);
0N/A return null;
0N/A }
0N/A });
0N/A }
0N/A }
0N/A }
0N/A
1501N/A public static void removeFromQueue(CloseAction ca) {
0N/A synchronized (StreamCloser.class) {
0N/A if (toCloseQueue != null) {
1501N/A toCloseQueue.remove(ca);
1501N/A }
1501N/A }
1501N/A }
1501N/A
1501N/A public static CloseAction createCloseAction(ImageInputStream iis) {
1501N/A return new CloseAction(iis);
1501N/A }
1501N/A
1501N/A public static final class CloseAction {
1501N/A private ImageInputStream iis;
1501N/A
1501N/A private CloseAction(ImageInputStream iis) {
1501N/A this.iis = iis;
1501N/A }
1501N/A
1501N/A public void performAction() throws IOException {
1501N/A if (iis != null) {
1501N/A iis.close();
0N/A }
0N/A }
0N/A }
0N/A}