NIO Selector - single threaded use

[Pho Tek]

My java class, Foo, will create a non-blocking SocketChannel to a network service. I save the SocketChannel to a member variable. Foo can perform two operations: opA() and opB(). Inside opA() and opB() I will do something like this:

class Foo ...
  private SocketChannel myConnection;
  public Foo() {
      myConnection = SocketChannel.open();
      myConnection.connect(...);
  }
  public void opA() {
      Selector s = Selector.open();
      SelectionKey key = myConnection.register(s, SelectionKey.OP_READ);
      while (s.select(5 * 1000) > 0) {
        ..
      }
  }

The question I have is this: if opA and opB are using the same SocketChannel, do I need to do any synchronization on the methods ? The reason I'm asking is because I've heard that Async I/O will allow me to dispense with creating multiple threads and multiple connections by multiplexing everything on a single connection.
Please enlighten me.
Thanks
Pho

[Jose Botella]

nio package won't dispense you from creating multiple connections, but from creating multiple threads. You could even have a single thread ready for reading/writing to multiple connections, and waiting for the the pending connections to a ServerSocketChannel to be accepted; all of these as indicated by a Selector.
Please read the NIO examples provided in the SDK Documentation.
The book The JDK1.4 Tutorial by Gregory M. Travis has also a chapter about NIO in which a server example appears.
[ March 30, 2004: Message edited by: Jose Botella ]