FileChannel: lock(long position, long size, boolean shared) : FileChannel « java.nio.channels « Java by API






  1. Java by API
  2. java.nio.channels
  3. FileChannel

FileChannel: lock(long position, long size, boolean shared)

 

import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;

public class Main {
  public static void main(String[] argv) throws Exception {
    String filename = "test.dat";

    RandomAccessFile raf1 = new RandomAccessFile(filename, "rw");
    FileChannel fc1 = raf1.getChannel();

    RandomAccessFile raf2 = new RandomAccessFile(filename, "rw");
    FileChannel fc2 = raf2.getChannel();

    System.out.println("Grabbing first lock");
    FileLock lock1 = fc1.lock(0L, Integer.MAX_VALUE, false);

    System.out.println("Grabbing second lock");
    FileLock lock2 = fc2.lock(5, 10, false);

    System.out.println("Exiting");
  }
}








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1.FileChannel.MapMode.READ_ONLY
2.FileChannel.MapMode.READ_WRITE
3.FileChannel: close()
4.FileChannel: map(MapMode mode, long position, long size)
5.FileChannel: position()
6.FileChannel: position(long newPosition)
7.FileChannel: read(ByteBuffer dst)
8.FileChannel: size()
9.FileChannel: transferFrom(ReadableByteChannel src, long position, long count)
10.FileChannel: transferTo(long position, long count, WritableByteChannel target)
11.FileChannel: tryLock()
12.FileChannel: write(MappedByteBuffer buffer)
13.FileChannel: write(ByteBuffer buffer)