1 /*

     2  * Copyright (c) 2016, 2018, 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  */

    25 

    26 package jdk.jfr.internal.cmd;

    27 

    28 import java.io.FileOutputStream;

    29 import java.io.IOException;

    30 import java.nio.channels.FileChannel;

    31 import java.nio.file.DirectoryStream;

    32 import java.nio.file.Files;

    33 import java.nio.file.Path;

    34 import java.nio.file.Paths;

    35 import java.util.ArrayList;

    36 import java.util.Deque;

    37 import java.util.List;

    38 

    39 final class ReconstructCommand extends Command {

    40 

    41     @Override

    42     public String getOptionSyntax() {

    43         return "<repository> <file>";

    44     }

    45 

    46     @Override

    47     public String getName() {

    48         return "reconstruct";

    49     }

    50 

    51     @Override

    52     public String getDescription() {

    53         return "Assemble leftover chunks, from a disk repository, into a recording file (.jfr)";

    54     }

    55 

    56     @Override

    57     public void displayOptionUsage() {

    58         println("  <repository>   Directory where the repository is located");

    59         println();

    60         println("  <file>         Name of the recording file (.jfr) to create");

    61     }

    62 

    63     @Override

    64     public void execute(Deque<String> options) {

    65         ensureMinArgumentCount(options, 2);

    66         ensureMaxArgumentCount(options, 2);

    67 

    68         Path repository = Paths.get(options.pop()).toAbsolutePath();

    69         if (!Files.exists(repository)) {

    70             userFailed("Could not find disk repository at " + repository);

    71         }

    72         if (!Files.isDirectory(repository)) {

    73             userFailed("Must specify a directory as disk repository");

    74         }

    75         Path output = Paths.get(options.pop());

    76         ensureFileDoesNotExist(output);

    77         ensureJFRFile(output);

    78 

    79         try (FileOutputStream fos = new FileOutputStream(output.toFile())) {

    80             List<Path> files = listJFRFiles(repository);

    81             if (files.isEmpty()) {

    82                 throw new IllegalStateException("No *.jfr files found at " + repository);

    83             }

    84             println();

    85             println("Combining files... ");

    86             println();

    87             transferTo(files, output, fos.getChannel());

    88             println();

    89             println("Reconstruction complete.");

    90         } catch (IOException e) {

    91             userFailed("Could not open destination file " + output + ". " + e.getMessage());

    92         }

    93     }

    94 

    95     private List<Path> listJFRFiles(Path path) throws IOException {

    96         try {

    97             List<Path> files = new ArrayList<>();

    98             if (Files.isDirectory(path)) {

    99                 try (DirectoryStream<Path> stream = Files.newDirectoryStream(path, "*.jfr")) {

   100                     for (Path p : stream) {

   101                         if (!Files.isDirectory(p) && Files.isReadable(p)) {

   102                             files.add(p);

   103                         }

   104                     }

   105                 }

   106             }

   107             files.sort((u, v) -> u.getFileName().compareTo(v.getFileName()));

   108             return files;

   109         } catch (IOException ioe) {

   110             throw new IllegalStateException("Could not list *.jfr for directory " + path + ". " + ioe.getMessage());

   111         }

   112     }

   113 

   114     private void transferTo(List<Path> sourceFiles, Path output, FileChannel out) {

   115         long pos = 0;

   116         for (Path p : sourceFiles) {

   117             println(" " + p.toString());

   118             try (FileChannel sourceChannel = FileChannel.open(p)) {

   119                 long rem = Files.size(p);

   120                 while (rem > 0) {

   121                     long n = Math.min(rem, 1024 * 1024);

   122                     long w = out.transferFrom(sourceChannel, pos, n);

   123                     pos += w;

   124                     rem -= w;

   125                 }

   126             } catch (IOException ioe) {

   127                 throw new IllegalStateException("Could not copy recording chunk " + p + " to new file. " + ioe.getMessage());

   128             }

   129         }

   130     }

   131 }