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25 
26 package jdk.jfr.internal.tool;
27 
28 import java.io.FileOutputStream;
29 import java.io.IOException;
30 import java.io.PrintStream;
31 import java.nio.channels.FileChannel;
32 import java.nio.file.DirectoryStream;
33 import java.nio.file.Files;
34 import java.nio.file.Path;
35 import java.nio.file.Paths;
36 import java.util.ArrayList;
37 import java.util.Collections;
38 import java.util.Deque;
39 import java.util.List;
40 
41 final class Assemble extends Command {
42 
43     @Override
getName()44     public String getName() {
45         return "assemble";
46     }
47 
48     @Override
getOptionSyntax()49     public List<String> getOptionSyntax() {
50         return Collections.singletonList("<repository> <file>");
51     }
52 
53     @Override
getDescription()54     public String getDescription() {
55         return "Assemble leftover chunks from a disk repository into a recording file";
56     }
57 
58     @Override
displayOptionUsage(PrintStream stream)59     public void displayOptionUsage(PrintStream stream) {
60         stream.println("  <repository>   Directory where the repository is located");
61         stream.println();
62         stream.println("  <file>         Name of the recording file (.jfr) to create");
63     }
64 
65     @Override
execute(Deque<String> options)66     public void execute(Deque<String> options) throws UserSyntaxException, UserDataException {
67         ensureMinArgumentCount(options, 2);
68         ensureMaxArgumentCount(options, 2);
69         Path repository = getDirectory(options.pop());
70 
71         Path file = Paths.get(options.pop());
72         ensureFileDoesNotExist(file);
73         ensureJFRFile(file);
74 
75         try (FileOutputStream fos = new FileOutputStream(file.toFile())) {
76             List<Path> files = listJFRFiles(repository);
77             if (files.isEmpty()) {
78                 throw new UserDataException("no *.jfr files found at " + repository);
79             }
80             println();
81             println("Assembling files... ");
82             println();
83             transferTo(files, file, fos.getChannel());
84             println();
85             println("Finished.");
86         } catch (IOException e) {
87             throw new UserDataException("could not open destination file " + file + ". " + e.getMessage());
88         }
89     }
90 
listJFRFiles(Path path)91     private List<Path> listJFRFiles(Path path) throws UserDataException {
92         try {
93             List<Path> files = new ArrayList<>();
94             if (Files.isDirectory(path)) {
95                 try (DirectoryStream<Path> stream = Files.newDirectoryStream(path, "*.jfr")) {
96                     for (Path p : stream) {
97                         if (!Files.isDirectory(p) && Files.isReadable(p)) {
98                             files.add(p);
99                         }
100                     }
101                 }
102             }
103             files.sort((u, v) -> u.getFileName().compareTo(v.getFileName()));
104             return files;
105         } catch (IOException ioe) {
106             throw new UserDataException("could not list *.jfr for directory " + path + ". " + ioe.getMessage());
107         }
108     }
109 
transferTo(List<Path> sourceFiles, Path output, FileChannel out)110     private void transferTo(List<Path> sourceFiles, Path output, FileChannel out) throws UserDataException {
111         long pos = 0;
112         for (Path p : sourceFiles) {
113             println(" " + p.toString());
114             try (FileChannel sourceChannel = FileChannel.open(p)) {
115                 long rem = Files.size(p);
116                 while (rem > 0) {
117                     long n = Math.min(rem, 1024 * 1024);
118                     long w = out.transferFrom(sourceChannel, pos, n);
119                     pos += w;
120                     rem -= w;
121                 }
122             } catch (IOException ioe) {
123                 throw new UserDataException("could not copy recording chunk " + p + " to new file. " + ioe.getMessage());
124             }
125         }
126     }
127 }
128