text: /**
   * Copyright (c) 2015-2020, Michael Yang 杨福海 (fuhai999@gmail.com).
   * <p>
   * 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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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 io.jboot.app.config.support.nacos;
  
  import com.alibaba.nacos.api.NacosFactory;
  import com.alibaba.nacos.api.config.ConfigService;
  import io.jboot.app.config.ConfigUtil;
  import io.jboot.app.config.JbootConfigManager;
  
  import java.io.IOException;
  import java.io.StringReader;
  import java.util.Objects;
  import java.util.Properties;
  
  /**
   * @author michael yang (fuhai999@gmail.com)
   * @Date: 2020/2/8
   */
  public class NacosConfigManager {
  
      private static final NacosConfigManager ME = new NacosConfigManager();
  
      public static NacosConfigManager me() {
          return ME;
      }
  
  
      private Properties contentProperties;
  
      /**
       * 初始化 nacos 配置监听
       */
      public void init(JbootConfigManager configManager) {
  
          NacosServerConfig nacosServerConfig = configManager.get(NacosServerConfig.class);
          if (!nacosServerConfig.isEnable() || !nacosServerConfig.isConfigOk()) {
              return;
          }
  
          try {
  
              ConfigService configService = NacosFactory.createConfigService(nacosServerConfig.toProperties());
              String content = configService.getConfig(nacosServerConfig.getDataId()
                      , nacosServerConfig.getGroup(), 3000);
  
              if (ConfigUtil.isNotBlank(content)) {
                  contentProperties = str2Properties(content);
                  if (contentProperties != null) {
                      configManager.setRemoteProperties(contentProperties);
                  }
              }
  
              new NacosConfigIniter(this, configManager).initListener(configService, nacosServerConfig);
  
          } catch (Exception e) {
              e.printStackTrace();
          }
      }
  
  
      /**
       * 接收到 nacos 服务器消息
       * @param configManager
       * @param configInfo
       */
      public void onReceiveConfigInfo(JbootConfigManager configManager, String configInfo) {
          Properties properties = str2Properties(configInfo);
          if (contentProperties == null) {
              contentProperties = properties;
  
              configManager.setRemoteProperties(properties);
          } else {
              for (Object key : properties.keySet()) {
                  String newValue = properties.getProperty(key.toString());
                  String oldValue = contentProperties.getProperty(key.toString());
  
                  if (!Objects.equals(newValue, oldValue)) {
                      contentProperties.put(key, newValue);
                      configManager.setRemoteProperty(key.toString(), newValue);
  
                      configManager.notifyChangeListeners(key.toString(),newValue,oldValue);
                  }
              }
          }
      }
  
  
      private Properties str2Properties(String content) {
          try {
              Properties properties = new Properties();
              properties.load(new StringReader(content));
              return properties;
          } catch (IOException e) {
              e.printStackTrace();
          }
          return null;
      }
  }
  