content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.alipay.remoting.config.switches;
  
  /**
   * switch interface
   *
   * @author tsui
   * @version $Id: Switch.java, v 0.1 2018-04-08 11:26 tsui Exp $
   */
  public interface Switch {
      /**
       * api for user to turn on a feature
       *
       * @param index the switch index of feature
       */
      void turnOn(int index);
  
      /**
       * api for user to turn off a feature
       * @param index the switch index of feature
       */
      void turnOff(int index);
  
      /**
       * check switch whether on
       *
       * @param index the switch index of feature
       * @return true if either system setting is on or user setting is on
       */
      boolean isOn(int index);
  }