| /* |
| * Copyright (c) 2016, 2018, 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 jdk.jfr.internal.cmd; |
| |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.nio.channels.FileChannel; |
| import java.nio.file.DirectoryStream; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import java.util.ArrayList; |
| import java.util.Deque; |
| import java.util.List; |
| |
| final class ReconstructCommand extends Command { |
| |
| @Override |
| public String getOptionSyntax() { |
| return "<repository> <file>"; |
| } |
| |
| @Override |
| public String getName() { |
| return "reconstruct"; |
| } |
| |
| @Override |
| public String getDescription() { |
| return "Assemble leftover chunks, from a disk repository, into a recording file (.jfr)"; |
| } |
| |
| @Override |
| public void displayOptionUsage() { |
| println(" <repository> Directory where the repository is located"); |
| println(); |
| println(" <file> Name of the recording file (.jfr) to create"); |
| } |
| |
| @Override |
| public void execute(Deque<String> options) { |
| ensureMinArgumentCount(options, 2); |
| ensureMaxArgumentCount(options, 2); |
| |
| Path repository = Paths.get(options.pop()).toAbsolutePath(); |
| if (!Files.exists(repository)) { |
| userFailed("Could not find disk repository at " + repository); |
| } |
| if (!Files.isDirectory(repository)) { |
| userFailed("Must specify a directory as disk repository"); |
| } |
| Path output = Paths.get(options.pop()); |
| ensureFileDoesNotExist(output); |
| ensureJFRFile(output); |
| |
| try (FileOutputStream fos = new FileOutputStream(output.toFile())) { |
| List<Path> files = listJFRFiles(repository); |
| if (files.isEmpty()) { |
| throw new IllegalStateException("No *.jfr files found at " + repository); |
| } |
| println(); |
| println("Combining files... "); |
| println(); |
| transferTo(files, output, fos.getChannel()); |
| println(); |
| println("Reconstruction complete."); |
| } catch (IOException e) { |
| userFailed("Could not open destination file " + output + ". " + e.getMessage()); |
| } |
| } |
| |
| private List<Path> listJFRFiles(Path path) throws IOException { |
| try { |
| List<Path> files = new ArrayList<>(); |
| if (Files.isDirectory(path)) { |
| try (DirectoryStream<Path> stream = Files.newDirectoryStream(path, "*.jfr")) { |
| for (Path p : stream) { |
| if (!Files.isDirectory(p) && Files.isReadable(p)) { |
| files.add(p); |
| } |
| } |
| } |
| } |
| files.sort((u, v) -> u.getFileName().compareTo(v.getFileName())); |
| return files; |
| } catch (IOException ioe) { |
| throw new IllegalStateException("Could not list *.jfr for directory " + path + ". " + ioe.getMessage()); |
| } |
| } |
| |
| private void transferTo(List<Path> sourceFiles, Path output, FileChannel out) { |
| long pos = 0; |
| for (Path p : sourceFiles) { |
| println(" " + p.toString()); |
| try (FileChannel sourceChannel = FileChannel.open(p)) { |
| long rem = Files.size(p); |
| while (rem > 0) { |
| long n = Math.min(rem, 1024 * 1024); |
| long w = out.transferFrom(sourceChannel, pos, n); |
| pos += w; |
| rem -= w; |
| } |
| } catch (IOException ioe) { |
| throw new IllegalStateException("Could not copy recording chunk " + p + " to new file. " + ioe.getMessage()); |
| } |
| } |
| } |
| } |