com.alibaba.nacos.common.utils.Observer Maven / Gradle / Ivy
/*
* 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.common.utils;
/**
* Obeserver.
*
* @author liaochuntao
* @author xiweng.yy
*/
public interface Observer {
/**
* This method is called whenever the observed object is changed. An application calls an {@code Observable}
* object's {@code notifyObservers} method to have all the object's observers notified of the change.
*
* @param o the observable object.
*/
void update(Observable o);
}