Java APIs

Hi guys,

I experience very strange problem. Once a new connection is established and the key for the channel is registered for READ operations, the selector starts to continuosly provide me with the key having OP_READ set up:

if (selector.select() == 0)
{
    continue;
}

Iterator<SelectionKey> it = selector.selectedKeys().iterator();
while (it.hasNext())
{
    SelectionKey key = (SelectionKey) it.next();

    // Accept new connection
    if (key.isAcceptable())
    {
        ServerSocketChannel server = (ServerSocketChannel) key.channel();
        SocketChannel channel = server.accept();

        if (channel == null)
        {
            continue;
        }

        // Set the new channel nonblocking
        channel.configureBlocking(false);

        // Register it with the selector
        SelectionKey newKey = channel.register(selector, SelectionKey.OP_READ);

        // initialization of attachment ...
    }

    if (key.isReadable())
    {
        System.out.print("session index = "  +((ConnectionDescriptor)key.attachment()).session.sessionIndex);+
+System.out.print(", counter "+  ++counter);+
+System.out.println(", ops="+  key.readyOps());                    

        // read the data from channel

        if( counter == 10 ) {
            setEnabled(false);
            break;
        }
    }

    it.remove();
 }

I use a python script in order to test the server:

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect("localhost", 28000)
s.send(b'\x00\x01')
s.close()

When I run the script I see the following output from the server:

session index = 1, counter 1, ops=1
session index = 1, counter 2, ops=1
session index = 1, counter 3, ops=1
header limit = 2
body limit = 0
process message 1
session index = 1, counter 4, ops=1
session index = 1, counter 5, ops=1
session index = 1, counter 6, ops=1
session index = 1, counter 7, ops=1
session index = 1, counter 8, ops=1
session index = 1, counter 9, ops=1
session index = 1, counter 10, ops=1

some parts of the code are omitted in order to keep it clear. If I do not stop it at 10th iteration it runs into endless loop.
Why the key always says that the channel is "ready" to be read while I actually have already read the data?

Thanks a lot in advance.

Edited by: coderman on Jan 28, 2010 5:44 AM