import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileChannel.MapMode;

public class MMapTest {

	public static void main(String[] args) throws IOException, InterruptedException {
		File f = File.createTempFile("test", ".mmap");
		RandomAccessFile raf = new RandomAccessFile(f, "rw");
		raf.write("Test file\n".getBytes("UTF-8"));
		raf.getFD().sync();
		long t0 = f.lastModified();
		Thread.sleep(1000);
		FileChannel channel = raf.getChannel();
		MappedByteBuffer buf = channel.map(MapMode.READ_WRITE, 0, f.length());
		buf.put("Mapd".getBytes("UTF-8"));
		long t1 = f.lastModified();
		buf.force();
		long t2 = f.lastModified();
		channel.close();
		long t3 = f.lastModified();
		System.err.println("t0 = " + t0);
		System.err.println("t1 = " + t1);
		System.err.println("t2 = " + t2);
		System.err.println("t3 = " + t3);
		raf = new RandomAccessFile(f, "r");
		System.err.println("file = " + raf.readLine());
	}

}