Fastest way of reading file into OS file cache

Question

I am looking for the fastest way of reading a file - I don't need to see the read bytes, I just need the file to be fully read so that it gets in the OS file cache.

This is what I am using at the moment (but it involves allocating a direct buffer for each file)

   FileInputStream f = new FileInputStream( file );
   FileChannel ch = f.getChannel( );
   ByteBuffer bb = ByteBuffer.allocateDirect((int)file.length() );
   ch.read(bb);

Answer 1

Thanks to EJPs suggestion, I created my own /dev/null file channel:

   RandomAccessFile racFile = new RandomAccessFile(file, "r");
   FileChannel ch = racFile.getChannel( );
   ch.transferTo(0,  fileLength, new WritableByteChannel(){

    @Override
    public boolean isOpen() {
        // TODO Auto-generated method stub
        return true;
    }

    @Override
    public void close() throws IOException {
        // TODO Auto-generated method stub

    }

    @Override
    public int write(ByteBuffer src) throws IOException {
        // TODO Auto-generated method stub
        int rem = src.remaining();
        return rem;
    }

   }

   );
   racFile.close();

This provided the fastest solution in my benchmarks.