Java nio Pipe - Selector ptoblem

Question

I try to use a Pipe with a non-blocking selector,
but the selector never selects the channel ...
-- I do this ---
Selector selector = SelectorProvider.provider().openSelector();
Pipe pipe = Pipe.open();
Pipe.SourceChannel cout = pipe.source();
cout.configureBlocking( false );
cout.register( selector, SelectionKey.OP_READ );
--- and in a nother thread i do this on the Pipe( same pipe ) ---
ByteBuffer buffin = ByteBuffer.wrap( "Testing".getBytes() );
Pipe.SinkChannel cin = pipe.sink();
cin.write( buffin );
if I read from the source I can read the data but the selector never selects it ??
/Mikael

Answer 1

Interesting problem.
This code seems to work for me:
    final Pipe pipe = Pipe.open();
    final Pipe.SourceChannel cout = pipe.source();
    final Selector s = Selector.open();
    cout.configureBlocking(false);
    cout.register(s, SelectionKey.OP_READ);
    Thread thread = new Thread(new Runnable() {
      public void run() {
        try {
        ByteBuffer buf = ByteBuffer.wrap("Testing".getBytes());
        Pipe.SinkChannel cin = pipe.sink();
        cin.write(buf);
        System.out.println("wrote");
        } catch (Exception e) {
          throw new RuntimeException(e.toString());
   thread.start();
   s.select();
   Iterator i = s.selectedKeys().iterator();
   while (i.hasNext()) {
     SelectionKey key = (SelectionKey)i.next();
     Pipe.SourceChannel out = (Pipe.SourceChannel)key.channel();
     ByteBuffer dbuf = ByteBuffer.allocate(1024);
     int read = out.read(dbuf);
     dbuf.flip();
     byte[] bbuf = new byte[read];
     dbuf.get(bbuf);
     System.out.println(new String(bbuf));
   }Is that different from your code??????
I tested this on a Windows 2K desktop with JDK 1.4.1_01 from Sun.