[WAGON-482] Use sparse files in HugeFileDownloadTest with Java 7

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.11
• Fix Version/s: 3.1.0
• Component/s: wagon-http
• Assignee: Michael Osipov
• Reporter: Michael Osipov
• Created: 03/Jan/17 20:41
• Updated: 05/Apr/18 20:10
• Resolved: 05/Apr/18 20:10

Description

Unfortunately, RandomAccessFile does not create sparse files on Windows with seek/position, it requires a specific flag set with NTFS. Luckily, NIO.2 supports this. File creation for 4 GiB will be tens of milliseconds. Use this snippet as soon as we move to Java 7:

Path tempDirectory = Files.createTempDirectory("jetty");
final ByteBuffer buf = ByteBuffer.allocate(4).putInt(2);
buf.rewind();

final OpenOption[] options = { StandardOpenOption.WRITE, StandardOpenOption.CREATE_NEW , StandardOpenOption.SPARSE };
final Path hugeFile = tempDirectory.resolve("hugefile.txt");

try (final SeekableByteChannel channel = Files.newByteChannel(hugeFile, options);) {
    channel.position(HUGE_FILE_SIZE);
    channel.write(buf);
}