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/*
* Copyright 1999-2018 Alibaba Group Holding Ltd.
*
* Licensed 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.alibaba.nacos.naming.raft;
/**
* @author nacos
*/
public interface RaftListener {
/**
* Determine if the listener was registered with this key
*
* @param key candidate key
* @return true if the listener was registered with this key
*/
boolean interests(String key);
/**
* Determine if the listener is to be removed by matching the 'key'
*
* @param key key to match
* @return true if match success
*/
boolean matchUnlistenKey(String key);
/**
* Action to do if data of target key has changed
*
* @param key target key
* @param value data of the key
* @throws Exception
*/
void onChange(String key, String value) throws Exception;
/**
* Action to do if data of target key has been removed
*
* @param key target key
* @param value data of the key
* @throws Exception
*/
void onDelete(String key, String value) throws Exception;
}