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.naming.pojo.instance;
  
  import com.alibaba.nacos.api.common.Constants;
  import com.alibaba.nacos.api.naming.pojo.Instance;
  import com.alibaba.nacos.api.naming.spi.generator.InstanceIdGenerator;
  import com.alibaba.nacos.api.utils.StringUtils;
  import com.alibaba.nacos.common.spi.NacosServiceLoader;
  
  import java.util.Collection;
  import java.util.Map;
  import java.util.NoSuchElementException;
  import java.util.concurrent.ConcurrentHashMap;
  
  /**
   * InstanceIdGeneratorManager.
   *
   * @author : huangtianhui
   */
  public class InstanceIdGeneratorManager {
      
      private static final InstanceIdGeneratorManager INSTANCE = new InstanceIdGeneratorManager();
      
      private final Map<String, InstanceIdGenerator> generatorMap = new ConcurrentHashMap<>();
      
      public InstanceIdGeneratorManager() {
          init();
      }
      
      private void init() {
          Collection<InstanceIdGenerator> instanceIdGenerators = NacosServiceLoader.load(InstanceIdGenerator.class);
          for (InstanceIdGenerator instanceIdGenerator : instanceIdGenerators) {
              generatorMap.put(instanceIdGenerator.type(), instanceIdGenerator);
          }
      }
      
      private InstanceIdGenerator getInstanceIdGenerator(String type) {
          if (generatorMap.containsKey(type)) {
              return generatorMap.get(type);
          }
          throw new NoSuchElementException("The InstanceIdGenerator type is not found ");
      }
      
      /**
       * spi generateInstanceId.
       *
       * @param instance instance
       * @return InstanceId
       */
      public static String generateInstanceId(Instance instance) {
          String instanceIdGeneratorType = instance.getInstanceIdGenerator();
          if (StringUtils.isBlank(instanceIdGeneratorType)) {
              instanceIdGeneratorType = Constants.DEFAULT_INSTANCE_ID_GENERATOR;
          }
          return INSTANCE.getInstanceIdGenerator(instanceIdGeneratorType).generateInstanceId(instance);
      }
      
  }
  