public static String removeIdPoolKeyMapping(Integer id, Channel channel) {
        Connection connection = getConnectionFromChannel(channel);
        if (connection != null) {
            return connection.removeIdPoolKeyMapping(id);
        }

        return null;
    }
connection util

@author yunliang.shi
@version $Id: ConnectionUtil.java, v 0.1 Mar 10, 2016 11:36:40 AM yunliang.shi Exp $
src/main/java/com/alipay/remoting/util/ConnectionUtil.java