com.alibaba.nacos.client.config.impl.ConfigChangeHandler 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.client.config.impl;
import com.alibaba.nacos.api.config.ConfigChangeItem;
import com.alibaba.nacos.api.config.listener.ConfigChangeParser;
import com.alibaba.nacos.common.spi.NacosServiceLoader;
import java.io.IOException;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
/**
* ConfigChangeHandler.
*
* @author rushsky518
*/
public class ConfigChangeHandler {
private static class ConfigChangeHandlerHolder {
private static final ConfigChangeHandler INSTANCE = new ConfigChangeHandler();
}
private ConfigChangeHandler() {
this.parserList = new LinkedList<>();
Collection loader = NacosServiceLoader.load(ConfigChangeParser.class);
this.parserList.addAll(loader);
this.parserList.add(new PropertiesChangeParser());
this.parserList.add(new YmlChangeParser());
}
public static ConfigChangeHandler getInstance() {
return ConfigChangeHandlerHolder.INSTANCE;
}
/**
* Parse changed data.
*
* @param oldContent old data
* @param newContent new data
* @param type data type
* @return change data map
* @throws IOException io exception
*/
public Map parseChangeData(String oldContent, String newContent, String type) throws IOException {
for (ConfigChangeParser changeParser : this.parserList) {
if (changeParser.isResponsibleFor(type)) {
return changeParser.doParse(oldContent, newContent, type);
}
}
return Collections.emptyMap();
}
private final List parserList;
}