jdk8-mips64-public/jaxws: src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/mimepull/WeakDataFile.java@9c07ef4934dd

     1 /*

     2  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    26 package com.sun.xml.internal.org.jvnet.mimepull;

    28 import java.io.File;

    29 import java.io.IOException;

    30 import java.io.RandomAccessFile;

    31 import java.lang.ref.ReferenceQueue;

    32 import java.lang.ref.WeakReference;

    33 import java.util.ArrayList;

    34 import java.util.List;

    35 import java.util.concurrent.Executor;

    36 import java.util.logging.Level;

    37 import java.util.logging.Logger;

    39 /**

    40  * Removing files based on this

    41  * <a href="http://java.sun.com/developer/technicalArticles/javase/finalization/">article</a>

    42  *

    43  * @author Jitendra Kotamraju

    44  */

    45 final class WeakDataFile extends WeakReference<DataFile> {

    47     private static final Logger LOGGER = Logger.getLogger(WeakDataFile.class.getName());

    48     //private static final int MAX_ITERATIONS = 2;

    49     private static ReferenceQueue<DataFile> refQueue = new ReferenceQueue<DataFile>();

    50     private static List<WeakDataFile> refList = new ArrayList<WeakDataFile>();

    51     private final File file;

    52     private final RandomAccessFile raf;

    53     private static boolean hasCleanUpExecutor = false;

    54     static {

    55         CleanUpExecutorFactory executorFactory = CleanUpExecutorFactory.newInstance();

    56         if (executorFactory!=null) {

    57             if (LOGGER.isLoggable(Level.FINE)) {

    58                 LOGGER.log(Level.FINE, "Initializing clean up executor for MIMEPULL: {0}", executorFactory.getClass().getName());

    59             }

    60             Executor executor = executorFactory.getExecutor();

    61             executor.execute(new Runnable() {

    62                 @Override

    63                 public void run() {

    64                     WeakDataFile weak;

    65                     while (true) {

    66                         try {

    67                             weak = (WeakDataFile) refQueue.remove();

    68                             if (LOGGER.isLoggable(Level.FINE)) {

    69                                 LOGGER.log(Level.FINE, "Cleaning file = {0} from reference queue.", weak.file);

    70                             }

    71                             weak.close();

    72                         } catch (InterruptedException e) {

    73                         }

    74                     }

    75                 }

    76             });

    77             hasCleanUpExecutor = true;

    78         }

    79     }

    81     WeakDataFile(DataFile df, File file) {

    82         super(df, refQueue);

    83         refList.add(this);

    84         this.file = file;

    85         try {

    86             raf = new RandomAccessFile(file, "rw");

    87         } catch(IOException ioe) {

    88             throw new MIMEParsingException(ioe);

    89         }

    90         if (!hasCleanUpExecutor) {

    91             drainRefQueueBounded();

    92         }

    93     }

    95     synchronized void read(long pointer, byte[] buf, int offset, int length ) {

    96         try {

    97             raf.seek(pointer);

    98             raf.readFully(buf, offset, length);

    99         } catch(IOException ioe) {

   100             throw new MIMEParsingException(ioe);

   101         }

   102     }

   104     synchronized long writeTo(long pointer, byte[] data, int offset, int length) {

   105         try {

   106             raf.seek(pointer);

   107             raf.write(data, offset, length);

   108             return raf.getFilePointer();    // Update pointer for next write

   109         } catch(IOException ioe) {

   110             throw new MIMEParsingException(ioe);

   111         }

   112     }

   114     void close() {

   115         if (LOGGER.isLoggable(Level.FINE)) {

   116             LOGGER.log(Level.FINE, "Deleting file = {0}", file.getName());

   117         }

   118         refList.remove(this);

   119         try {

   120             raf.close();

   121             boolean deleted = file.delete();

   122             if (!deleted) {

   123                 if (LOGGER.isLoggable(Level.INFO)) {

   124                     LOGGER.log(Level.INFO, "File {0} was not deleted", file.getAbsolutePath());

   125                 }

   126             }

   127         } catch(IOException ioe) {

   128             throw new MIMEParsingException(ioe);

   129         }

   130     }

   132     void renameTo(File f) {

   133         if (LOGGER.isLoggable(Level.FINE)) {

   134             LOGGER.log(Level.FINE, "Moving file={0} to={1}", new Object[]{file, f});

   135         }

   136         refList.remove(this);

   137         try {

   138             raf.close();

   139             boolean renamed = file.renameTo(f);

   140             if (!renamed) {

   141                 if (LOGGER.isLoggable(Level.INFO)) {

   142                     LOGGER.log(Level.INFO, "File {0} was not moved to {1}", new Object[] {file.getAbsolutePath(), f.getAbsolutePath()});

   143                 }

   144             }

   145         } catch(IOException ioe) {

   146             throw new MIMEParsingException(ioe);

   147         }

   149     }

   151     static void drainRefQueueBounded() {

   152         WeakDataFile weak;

   153         while (( weak = (WeakDataFile) refQueue.poll()) != null ) {

   154             if (LOGGER.isLoggable(Level.FINE)) {

   155                 LOGGER.log(Level.FINE, "Cleaning file = {0} from reference queue.", weak.file);

   156             }

   157             weak.close();

   158         }

   159     }

   160 }

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