private boolean isConnectionOn(Connection connection) {
        String serviceStatus = (String) connection.getAttribute(Configs.CONN_SERVICE_STATUS);
        return serviceStatus == null || Boolean.parseBoolean(serviceStatus);
    }
This method only invoked in ScheduledDisconnectStrategy, so no need to be exposed.
This method will be remove in next version, do not use this method.

The user cannot call ScheduledDisconnectStrategy#filter, so modifying the implementation of this method is safe.

@param connections connections from a connection pool
src/main/java/com/alipay/remoting/ScheduledDisconnectStrategy.java