| /* |
| * Copyright (c) 1997, 2012, 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 com.sun.xml.internal.org.jvnet.mimepull; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.RandomAccessFile; |
| import java.lang.ref.ReferenceQueue; |
| import java.lang.ref.WeakReference; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.Executor; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| /** |
| * Removing files based on this |
| * <a href="http://java.sun.com/developer/technicalArticles/javase/finalization/">article</a> |
| * |
| * @author Jitendra Kotamraju |
| */ |
| final class WeakDataFile extends WeakReference<DataFile> { |
| |
| private static final Logger LOGGER = Logger.getLogger(WeakDataFile.class.getName()); |
| //private static final int MAX_ITERATIONS = 2; |
| private static ReferenceQueue<DataFile> refQueue = new ReferenceQueue<DataFile>(); |
| private static List<WeakDataFile> refList = new ArrayList<WeakDataFile>(); |
| private final File file; |
| private final RandomAccessFile raf; |
| private static boolean hasCleanUpExecutor = false; |
| static { |
| CleanUpExecutorFactory executorFactory = CleanUpExecutorFactory.newInstance(); |
| if (executorFactory!=null) { |
| if (LOGGER.isLoggable(Level.FINE)) { |
| LOGGER.log(Level.FINE, "Initializing clean up executor for MIMEPULL: {0}", executorFactory.getClass().getName()); |
| } |
| Executor executor = executorFactory.getExecutor(); |
| executor.execute(new Runnable() { |
| @Override |
| public void run() { |
| WeakDataFile weak; |
| while (true) { |
| try { |
| weak = (WeakDataFile) refQueue.remove(); |
| if (LOGGER.isLoggable(Level.FINE)) { |
| LOGGER.log(Level.FINE, "Cleaning file = {0} from reference queue.", weak.file); |
| } |
| weak.close(); |
| } catch (InterruptedException e) { |
| } |
| } |
| } |
| }); |
| hasCleanUpExecutor = true; |
| } |
| } |
| |
| WeakDataFile(DataFile df, File file) { |
| super(df, refQueue); |
| refList.add(this); |
| this.file = file; |
| try { |
| raf = new RandomAccessFile(file, "rw"); |
| } catch(IOException ioe) { |
| throw new MIMEParsingException(ioe); |
| } |
| if (!hasCleanUpExecutor) { |
| drainRefQueueBounded(); |
| } |
| } |
| |
| synchronized void read(long pointer, byte[] buf, int offset, int length ) { |
| try { |
| raf.seek(pointer); |
| raf.readFully(buf, offset, length); |
| } catch(IOException ioe) { |
| throw new MIMEParsingException(ioe); |
| } |
| } |
| |
| synchronized long writeTo(long pointer, byte[] data, int offset, int length) { |
| try { |
| raf.seek(pointer); |
| raf.write(data, offset, length); |
| return raf.getFilePointer(); // Update pointer for next write |
| } catch(IOException ioe) { |
| throw new MIMEParsingException(ioe); |
| } |
| } |
| |
| void close() { |
| if (LOGGER.isLoggable(Level.FINE)) { |
| LOGGER.log(Level.FINE, "Deleting file = {0}", file.getName()); |
| } |
| refList.remove(this); |
| try { |
| raf.close(); |
| boolean deleted = file.delete(); |
| if (!deleted) { |
| if (LOGGER.isLoggable(Level.INFO)) { |
| LOGGER.log(Level.INFO, "File {0} was not deleted", file.getAbsolutePath()); |
| } |
| } |
| } catch(IOException ioe) { |
| throw new MIMEParsingException(ioe); |
| } |
| } |
| |
| void renameTo(File f) { |
| if (LOGGER.isLoggable(Level.FINE)) { |
| LOGGER.log(Level.FINE, "Moving file={0} to={1}", new Object[]{file, f}); |
| } |
| refList.remove(this); |
| try { |
| raf.close(); |
| boolean renamed = file.renameTo(f); |
| if (!renamed) { |
| if (LOGGER.isLoggable(Level.INFO)) { |
| LOGGER.log(Level.INFO, "File {0} was not moved to {1}", new Object[] {file.getAbsolutePath(), f.getAbsolutePath()}); |
| } |
| } |
| } catch(IOException ioe) { |
| throw new MIMEParsingException(ioe); |
| } |
| |
| } |
| |
| static void drainRefQueueBounded() { |
| WeakDataFile weak; |
| while (( weak = (WeakDataFile) refQueue.poll()) != null ) { |
| if (LOGGER.isLoggable(Level.FINE)) { |
| LOGGER.log(Level.FINE, "Cleaning file = {0} from reference queue.", weak.file); |
| } |
| weak.close(); |
| } |
| } |
| } |