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Java example source code file (CreatedFontTracker.java)
The CreatedFontTracker.java Java example source code/* * Copyright (c) 2008, 2013, 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.util.HashMap; import java.util.Map; import java.util.concurrent.Semaphore; import java.util.concurrent.TimeUnit; import sun.awt.AppContext; 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. java.security.AccessController.doPrivileged( new java.security.PrivilegedAction() { public Object run() { /* 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 tg = Thread.currentThread().getThreadGroup(); for (ThreadGroup tgn = tg; tgn != null; tg = tgn, tgn = tg.getParent()); t = new Thread(tg, new Runnable() { public void run() { runHooks(); } }); 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(); } } } } Other Java examples (source code examples)Here is a short list of links related to this Java CreatedFontTracker.java source code file: |
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