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/* @test
* @bug 4625907
* @summary Testing force()
* @run main/othervm Force
*/
import java.io.*;
import java.nio.*;
import java.util.*;
import java.nio.channels.*;
public class Force {
public static void main(String[] args) throws Exception {
Random random = new Random();
long filesize = random.nextInt(3*1024*1024);
int cut = random.nextInt((int)filesize);
File file = File.createTempFile("Blah", null);
file.deleteOnExit();
try (RandomAccessFile raf = new RandomAccessFile(file, "rw")) {
raf.setLength(filesize);
FileChannel fc = raf.getChannel();
MappedByteBuffer mbb = fc.map(FileChannel.MapMode.READ_WRITE, cut, filesize-cut);
mbb.force();
}
// improve chance that mapped buffer will be unmapped
System.gc();
Thread.sleep(500);
}
}