public void inform(Listener l) {
										l.connectionClosed(connectionType, connection);
									}
Get a set of accepted connections.

@param connectionType
         Identifies the set of connections to return.
@return A set of sockets, each wrapped in an {@link IdleAwareSocketWrapper}
        .
@throws ShutdownException
          If the acceptor is shutdown.
ngrinder-core/src/main/java/net/grinder/communication/Acceptor.java