content: /*
   * Copyright 1999-2023 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.config.server.model.gray;
  
  import com.alibaba.nacos.common.spi.NacosServiceLoader;
  import com.google.gson.Gson;
  
  import java.lang.reflect.Constructor;
  import java.util.Collection;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  /**
   * GrayRuleManager.
   *
   * @author zunfei.lzf
   */
  public class GrayRuleManager {
      
      private static final Map<String, Class<?>> GRAY_RULE_MAP = new ConcurrentHashMap<>(8);
      
      public static final String SPLIT = "_";
      
      static {
          Collection<GrayRule> grayRuleCollection = NacosServiceLoader.load(GrayRule.class);
          for (GrayRule grayRule : grayRuleCollection) {
              GRAY_RULE_MAP.put(grayRule.getType() + SPLIT + grayRule.getVersion(), grayRule.getClass());
          }
      }
      
      /**
       * get class by type and version.
       *
       * @param type    type.
       * @param version version.
       * @return class.
       * @date 2024/3/14
       */
      public static Class<?> getClassByTypeAndVersion(String type, String version) {
          return GRAY_RULE_MAP.get(type + SPLIT + version);
      }
      
      /**
       * construct gray rule.
       *
       * @param configGrayPersistInfo config gray persist info.
       * @return gray rule.
       * @date 2024/3/14
       */
      public static GrayRule constructGrayRule(ConfigGrayPersistInfo configGrayPersistInfo) {
          Class<?> classByTypeAndVersion = getClassByTypeAndVersion(configGrayPersistInfo.getType(),
                  configGrayPersistInfo.getVersion());
          if (classByTypeAndVersion == null) {
              return null;
          }
          try {
              Constructor<?> declaredConstructor = classByTypeAndVersion.getDeclaredConstructor(String.class, int.class);
              declaredConstructor.setAccessible(true);
              return (GrayRule) declaredConstructor.newInstance(configGrayPersistInfo.getExpr(),
                      configGrayPersistInfo.getPriority());
          } catch (Exception e) {
              throw new RuntimeException(String.format("construct gray rule failed with type[%s], version[%s].",
                      configGrayPersistInfo.getType(), configGrayPersistInfo.getVersion()), e);
          }
      }
      
      /**
       * construct config gray persist info.
       *
       * @param grayRule gray rule.
       * @return config gray persist info.
       * @date 2024/3/14
       */
      public static ConfigGrayPersistInfo constructConfigGrayPersistInfo(GrayRule grayRule) {
          return new ConfigGrayPersistInfo(grayRule.getType(), grayRule.getVersion(), grayRule.getRawGrayRuleExp(),
                  grayRule.getPriority());
      }
      
      /**
       * deserialize config gray persist info.
       *
       * @param grayRuleRawStringFromDb gray rule raw string from db.
       * @return config gray persist info.
       * @date 2024/3/14
       */
      public static ConfigGrayPersistInfo deserializeConfigGrayPersistInfo(String grayRuleRawStringFromDb) {
          return (new Gson()).fromJson(grayRuleRawStringFromDb, ConfigGrayPersistInfo.class);
      }
      
      /**
       * serialize config gray persist info.
       *
       * @param configGrayPersistInfo config gray persist info.
       * @return serialized string.
       * @date 2024/3/14
       */
      public static String serializeConfigGrayPersistInfo(ConfigGrayPersistInfo configGrayPersistInfo) {
          return (new Gson()).toJson(configGrayPersistInfo);
      }
  }
  