content: /*
   * 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.api.naming.pojo.healthcheck;
  
  import com.alibaba.nacos.api.naming.pojo.healthcheck.impl.Http;
  import com.alibaba.nacos.api.naming.pojo.healthcheck.impl.Mysql;
  import com.alibaba.nacos.api.naming.pojo.healthcheck.impl.Tcp;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  /**
   * Health check type.
   *
   * @author nkorange
   */
  public enum HealthCheckType {
      /**
       * TCP type.
       */
      TCP(Tcp.class),
      /**
       * HTTP type.
       */
      HTTP(Http.class),
      /**
       * MySQL type.
       */
      MYSQL(Mysql.class),
      /**
       * No check.
       */
      NONE(AbstractHealthChecker.None.class);
      
      private final Class<? extends AbstractHealthChecker> healthCheckerClass;
      
      /**
       * In JDK 1.6, the map need full class for general. So ignore check style.
       */
      @SuppressWarnings("checkstyle:linelength")
      private static final Map<String, Class<? extends AbstractHealthChecker>> EXTEND = new ConcurrentHashMap<>();
      
      HealthCheckType(Class<? extends AbstractHealthChecker> healthCheckerClass) {
          this.healthCheckerClass = healthCheckerClass;
      }
      
      /**
       * Register extend health checker.
       *
       * @param type               type name of extend health checker
       * @param healthCheckerClass class of extend health checker
       */
      public static void registerHealthChecker(String type, Class<? extends AbstractHealthChecker> healthCheckerClass) {
          if (!EXTEND.containsKey(type)) {
              EXTEND.put(type, healthCheckerClass);
              HealthCheckerFactory.registerSubType(healthCheckerClass, type);
          }
      }
      
      /**
       * Get health checker class from type.
       *
       * @param type type name of extend health checker
       * @return registered class if have, otherwise default class
       */
      public static Class<? extends AbstractHealthChecker> ofHealthCheckerClass(String type) {
          HealthCheckType enumType;
          try {
              enumType = valueOf(type);
          } catch (Exception e) {
              return EXTEND.get(type);
          }
          return enumType.healthCheckerClass;
      }
      
      public static List<Class<? extends AbstractHealthChecker>> getLoadedHealthCheckerClasses() {
          List<Class<? extends AbstractHealthChecker>> all = new ArrayList<>();
          for (HealthCheckType type : values()) {
              all.add(type.healthCheckerClass);
          }
          for (Map.Entry<String, Class<? extends AbstractHealthChecker>> entry : EXTEND.entrySet()) {
              all.add(entry.getValue());
          }
          return all;
      }
  }
  