@Override
    public void add(Connection connection) {
        Set<String> poolKeys = connection.getPoolKeys();
        for (String poolKey : poolKeys) {
            this.add(connection, poolKey);
        }
    }
@see com.alipay.remoting.ConnectionManager#add(com.alipay.remoting.Connection)
src/main/java/com/alipay/remoting/DefaultConnectionManager.java