ohair@286: /*
alanb@368:  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
ohair@286:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ohair@286:  *
ohair@286:  * This code is free software; you can redistribute it and/or modify it
ohair@286:  * under the terms of the GNU General Public License version 2 only, as
ohair@286:  * published by the Free Software Foundation.  Oracle designates this
ohair@286:  * particular file as subject to the "Classpath" exception as provided
ohair@286:  * by Oracle in the LICENSE file that accompanied this code.
ohair@286:  *
ohair@286:  * This code is distributed in the hope that it will be useful, but WITHOUT
ohair@286:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ohair@286:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ohair@286:  * version 2 for more details (a copy is included in the LICENSE file that
ohair@286:  * accompanied this code).
ohair@286:  *
ohair@286:  * You should have received a copy of the GNU General Public License version
ohair@286:  * 2 along with this work; if not, write to the Free Software Foundation,
ohair@286:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ohair@286:  *
ohair@286:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@286:  * or visit www.oracle.com if you need additional information or have any
ohair@286:  * questions.
ohair@286:  */
ohair@286: 
ohair@286: package com.sun.xml.internal.org.jvnet.mimepull;
ohair@286: 
ohair@286: import java.io.File;
ohair@286: import java.io.IOException;
ohair@286: import java.io.RandomAccessFile;
ohair@286: import java.lang.ref.ReferenceQueue;
ohair@286: import java.lang.ref.WeakReference;
ohair@286: import java.util.ArrayList;
ohair@286: import java.util.List;
ohair@286: import java.util.concurrent.Executor;
alanb@368: import java.util.logging.Level;
ohair@286: import java.util.logging.Logger;
ohair@286: 
ohair@286: /**
ohair@286:  * Removing files based on this
ohair@286:  * <a href="http://java.sun.com/developer/technicalArticles/javase/finalization/">article</a>
ohair@286:  *
ohair@286:  * @author Jitendra Kotamraju
ohair@286:  */
ohair@286: final class WeakDataFile extends WeakReference<DataFile> {
ohair@286: 
ohair@286:     private static final Logger LOGGER = Logger.getLogger(WeakDataFile.class.getName());
ohair@286:     //private static final int MAX_ITERATIONS = 2;
ohair@286:     private static ReferenceQueue<DataFile> refQueue = new ReferenceQueue<DataFile>();
ohair@286:     private static List<WeakDataFile> refList = new ArrayList<WeakDataFile>();
ohair@286:     private final File file;
ohair@286:     private final RandomAccessFile raf;
ohair@286:     private static boolean hasCleanUpExecutor = false;
ohair@286:     static {
ohair@286:         CleanUpExecutorFactory executorFactory = CleanUpExecutorFactory.newInstance();
ohair@286:         if (executorFactory!=null) {
alanb@368:             if (LOGGER.isLoggable(Level.FINE)) {
alanb@368:                 LOGGER.log(Level.FINE, "Initializing clean up executor for MIMEPULL: {0}", executorFactory.getClass().getName());
alanb@368:             }
ohair@286:             Executor executor = executorFactory.getExecutor();
ohair@286:             executor.execute(new Runnable() {
alanb@368:                 @Override
ohair@286:                 public void run() {
alanb@368:                     WeakDataFile weak;
ohair@286:                     while (true) {
ohair@286:                         try {
ohair@286:                             weak = (WeakDataFile) refQueue.remove();
alanb@368:                             if (LOGGER.isLoggable(Level.FINE)) {
alanb@368:                                 LOGGER.log(Level.FINE, "Cleaning file = {0} from reference queue.", weak.file);
alanb@368:                             }
ohair@286:                             weak.close();
ohair@286:                         } catch (InterruptedException e) {
ohair@286:                         }
ohair@286:                     }
ohair@286:                 }
ohair@286:             });
ohair@286:             hasCleanUpExecutor = true;
ohair@286:         }
ohair@286:     }
ohair@286: 
ohair@286:     WeakDataFile(DataFile df, File file) {
ohair@286:         super(df, refQueue);
ohair@286:         refList.add(this);
ohair@286:         this.file = file;
ohair@286:         try {
ohair@286:             raf = new RandomAccessFile(file, "rw");
ohair@286:         } catch(IOException ioe) {
ohair@286:             throw new MIMEParsingException(ioe);
ohair@286:         }
ohair@286:         if (!hasCleanUpExecutor) {
ohair@286:             drainRefQueueBounded();
ohair@286:         }
ohair@286:     }
ohair@286: 
ohair@286:     synchronized void read(long pointer, byte[] buf, int offset, int length ) {
ohair@286:         try {
ohair@286:             raf.seek(pointer);
ohair@286:             raf.readFully(buf, offset, length);
ohair@286:         } catch(IOException ioe) {
ohair@286:             throw new MIMEParsingException(ioe);
ohair@286:         }
ohair@286:     }
ohair@286: 
ohair@286:     synchronized long writeTo(long pointer, byte[] data, int offset, int length) {
ohair@286:         try {
ohair@286:             raf.seek(pointer);
ohair@286:             raf.write(data, offset, length);
ohair@286:             return raf.getFilePointer();    // Update pointer for next write
ohair@286:         } catch(IOException ioe) {
ohair@286:             throw new MIMEParsingException(ioe);
ohair@286:         }
ohair@286:     }
ohair@286: 
ohair@286:     void close() {
alanb@368:         if (LOGGER.isLoggable(Level.FINE)) {
alanb@368:             LOGGER.log(Level.FINE, "Deleting file = {0}", file.getName());
alanb@368:         }
ohair@286:         refList.remove(this);
ohair@286:         try {
ohair@286:             raf.close();
alanb@368:             boolean deleted = file.delete();
alanb@368:             if (!deleted) {
alanb@368:                 if (LOGGER.isLoggable(Level.INFO)) {
alanb@368:                     LOGGER.log(Level.INFO, "File {0} was not deleted", file.getAbsolutePath());
alanb@368:                 }
alanb@368:             }
ohair@286:         } catch(IOException ioe) {
ohair@286:             throw new MIMEParsingException(ioe);
ohair@286:         }
ohair@286:     }
ohair@286: 
ohair@286:     void renameTo(File f) {
alanb@368:         if (LOGGER.isLoggable(Level.FINE)) {
alanb@368:             LOGGER.log(Level.FINE, "Moving file={0} to={1}", new Object[]{file, f});
alanb@368:         }
ohair@286:         refList.remove(this);
ohair@286:         try {
ohair@286:             raf.close();
alanb@368:             boolean renamed = file.renameTo(f);
alanb@368:             if (!renamed) {
alanb@368:                 if (LOGGER.isLoggable(Level.INFO)) {
alanb@368:                     LOGGER.log(Level.INFO, "File {0} was not moved to {1}", new Object[] {file.getAbsolutePath(), f.getAbsolutePath()});
alanb@368:                 }
alanb@368:             }
ohair@286:         } catch(IOException ioe) {
ohair@286:             throw new MIMEParsingException(ioe);
ohair@286:         }
ohair@286: 
ohair@286:     }
ohair@286: 
ohair@286:     static void drainRefQueueBounded() {
alanb@368:         WeakDataFile weak;
ohair@286:         while (( weak = (WeakDataFile) refQueue.poll()) != null ) {
alanb@368:             if (LOGGER.isLoggable(Level.FINE)) {
alanb@368:                 LOGGER.log(Level.FINE, "Cleaning file = {0} from reference queue.", weak.file);
alanb@368:             }
ohair@286:             weak.close();
ohair@286:         }
ohair@286:     }
ohair@286: }