Create a private (copy-on-write) memory-mapped file. : FileChannel « File Input Output « Java






  1. Java
  2. File Input Output
  3. FileChannel

Create a private (copy-on-write) memory-mapped file.

    

import java.io.File;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class Main {
  public static void main(String[] argv) throws Exception {
    File file = new File("filename");
    FileChannel roChannel = new RandomAccessFile(file, "r").getChannel();
    ByteBuffer readonlybuffer = roChannel.map(FileChannel.MapMode.READ_ONLY, 0, (int) roChannel
        .size());

    FileChannel rwChannel = new RandomAccessFile(file, "rw").getChannel();
    ByteBuffer writeonlybuffer = rwChannel.map(FileChannel.MapMode.READ_WRITE, 0, (int) rwChannel
        .size());

    // Create a private (copy-on-write) memory-mapped file.
    FileChannel pvChannel = new RandomAccessFile(file, "rw").getChannel();

    ByteBuffer privatebuffer = roChannel.map(FileChannel.MapMode.READ_WRITE, 0, (int) rwChannel
        .size());

  }
}








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