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  nio problem - select() returns 0 immediately  (Read 1187 times)
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Offline HamsterofDeath

Junior Member




Java games rock!


« Posted 2005-02-11 17:09:00 »

i have a problem with channels. i wrote a little chat server& client. the first message is received and multicasted to every client - works fine.

the simplified code is:
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          while (isRunning())
          {
            SocketChannel ch = null;
            try
            {
              int selected = selector.select();
              if (selected==0)
              {
                continue;
              }
              Iterator<SelectionKey> selectedKeys = selector.selectedKeys().iterator();
              while (selectedKeys.hasNext())
              {
                SelectionKey key = selectedKeys.next();
                ch                   = (SocketChannel) key.channel();
                  bytes = readAll(ch)
              }
        } // end method run


readAll reads as much bytes as possible, then returns the bytes or null. if it returns a byte[], the data is complete. in the other case, it will continue reading from the bytebuffer the next time select() returns. (it's managing everything perfectly, the problem is definetly not inside this method)

my problem begins when i try to send a second message. select() returns immediately - forever. and gives me an empty set.
wtf is going on ?
accoding to the api, this is not possible.
Offline Warren_Head

Senior Newbie




Java games rock!


« Reply #1 - Posted 2005-02-11 20:29:59 »

actually, you are reprocessing the same key over and over again because you omitted this bit:

selectedKeys.remove();

So the big picture should be:

Iterator<SelectionKey> selectedKeys = selector.selectedKeys().iterator();
while (selectedKeys.hasNext())
{
     SelectionKey key = selectedKeys.next();
     ch    = (SocketChannel) key.channel();
     bytes = readAll(ch)
}
// remove the processed key from the list
selectedKeys.remove();

Edit: the remove should be inside the } ofcourse Lips Sealed
but you probably found that out already
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