| /* |
| * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.font; |
| |
| import java.io.File; |
| import java.io.OutputStream; |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.concurrent.Semaphore; |
| import java.util.concurrent.TimeUnit; |
| |
| import sun.awt.AppContext; |
| import sun.awt.util.ThreadGroupUtils; |
| |
| public class CreatedFontTracker { |
| |
| public static final int MAX_FILE_SIZE = 32 * 1024 * 1024; |
| public static final int MAX_TOTAL_BYTES = 10 * MAX_FILE_SIZE; |
| |
| static CreatedFontTracker tracker; |
| int numBytes; |
| |
| public static synchronized CreatedFontTracker getTracker() { |
| if (tracker == null) { |
| tracker = new CreatedFontTracker(); |
| } |
| return tracker; |
| } |
| |
| private CreatedFontTracker() { |
| numBytes = 0; |
| } |
| |
| public synchronized int getNumBytes() { |
| return numBytes; |
| } |
| |
| public synchronized void addBytes(int sz) { |
| numBytes += sz; |
| } |
| |
| public synchronized void subBytes(int sz) { |
| numBytes -= sz; |
| } |
| |
| /** |
| * Returns an AppContext-specific counting semaphore. |
| */ |
| private static synchronized Semaphore getCS() { |
| final AppContext appContext = AppContext.getAppContext(); |
| Semaphore cs = (Semaphore) appContext.get(CreatedFontTracker.class); |
| if (cs == null) { |
| // Make a semaphore with 5 permits that obeys the first-in first-out |
| // granting of permits. |
| cs = new Semaphore(5, true); |
| appContext.put(CreatedFontTracker.class, cs); |
| } |
| return cs; |
| } |
| |
| public boolean acquirePermit() throws InterruptedException { |
| // This does a timed-out wait. |
| return getCS().tryAcquire(120, TimeUnit.SECONDS); |
| } |
| |
| public void releasePermit() { |
| getCS().release(); |
| } |
| |
| public void add(File file) { |
| TempFileDeletionHook.add(file); |
| } |
| |
| public void set(File file, OutputStream os) { |
| TempFileDeletionHook.set(file, os); |
| } |
| |
| public void remove(File file) { |
| TempFileDeletionHook.remove(file); |
| } |
| |
| /** |
| * Helper class for cleanup of temp files created while processing fonts. |
| * Note that this only applies to createFont() from an InputStream object. |
| */ |
| private static class TempFileDeletionHook { |
| private static HashMap<File, OutputStream> files = new HashMap<>(); |
| |
| private static Thread t = null; |
| static void init() { |
| if (t == null) { |
| // Add a shutdown hook to remove the temp file. |
| AccessController.doPrivileged((PrivilegedAction<Void>) () -> { |
| /* The thread must be a member of a thread group |
| * which will not get GCed before VM exit. |
| * Make its parent the top-level thread group. |
| */ |
| ThreadGroup rootTG = ThreadGroupUtils.getRootThreadGroup(); |
| t = new Thread(rootTG, TempFileDeletionHook::runHooks, |
| "TempFontFileDeleter", 0, false); |
| /* Set context class loader to null in order to avoid |
| * keeping a strong reference to an application classloader. |
| */ |
| t.setContextClassLoader(null); |
| Runtime.getRuntime().addShutdownHook(t); |
| return null; |
| }); |
| } |
| } |
| |
| private TempFileDeletionHook() {} |
| |
| static synchronized void add(File file) { |
| init(); |
| files.put(file, null); |
| } |
| |
| static synchronized void set(File file, OutputStream os) { |
| files.put(file, os); |
| } |
| |
| static synchronized void remove(File file) { |
| files.remove(file); |
| } |
| |
| static synchronized void runHooks() { |
| if (files.isEmpty()) { |
| return; |
| } |
| |
| for (Map.Entry<File, OutputStream> entry : files.entrySet()) { |
| // Close the associated output stream, and then delete the file. |
| try { |
| if (entry.getValue() != null) { |
| entry.getValue().close(); |
| } |
| } catch (Exception e) {} |
| entry.getKey().delete(); |
| } |
| } |
| } |
| } |