confmaster/src/main/java/com/navercorp/nbasearc/confmaster/io/EventSelector.java
public void register(Session session, int ops) throws ClosedChannelException {
        if (sessions.containsKey(session.getID())) {
            throw new IllegalStateException("Altready registered session");
        }
        
        SelectionKey selKey;
        try {
            selKey = session.getChannel().register(selector, ops, session);
        } catch (ClosedChannelException e) {
            Logger.error("Error while register channel to selector. {}", session, e);
            throw e;
        }
        session.setSelectionKey(selKey);
    }
public void register(Session session, int ops) throws ClosedChannelException {
        if (sessions.containsKey(session.getID())) {
            throw new IllegalStateException("Altready registered session");
        }
        
        SelectionKey selKey;
        try {
            selKey = session.getChannel().register(selector, ops, session);
        } catch (ClosedChannelException e) {
            Logger.error("Error while register channel to selector. {}", session, e);
            throw e;
        }
        session.setSelectionKey(selKey);
    }
register session to Selector in order to detect IO events.
@param session
@param ops interest IO operations, such as SelectionKey.OP_ACCEPT, SelectionKey.OP_CONNECT, SelectionKey.OP_READ, SelectionKey.OP_WRITE
@throws ClosedChannelException