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.AbstractHealthChecker.None;
  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 com.fasterxml.jackson.annotation.JsonIgnore;
  import com.fasterxml.jackson.annotation.JsonSubTypes;
  import com.fasterxml.jackson.annotation.JsonTypeInfo;
  import com.fasterxml.jackson.annotation.JsonTypeInfo.Id;
  
  import java.io.Serializable;
  
  /**
   * Abstract health checker.
   *
   * @author nkorange
   */
  @JsonTypeInfo(use = Id.NAME, property = "type", defaultImpl = None.class)
  @JsonSubTypes({@JsonSubTypes.Type(name = Http.TYPE, value = Http.class),
          @JsonSubTypes.Type(name = Mysql.TYPE, value = Mysql.class),
          @JsonSubTypes.Type(name = Tcp.TYPE, value = Tcp.class),
          @JsonSubTypes.Type(name = None.TYPE, value = None.class)})
  public abstract class AbstractHealthChecker implements Cloneable, Serializable {
      
      private static final long serialVersionUID = 3848305577423336421L;
      
      @JsonIgnore
      protected final String type;
      
      protected AbstractHealthChecker(String type) {
          this.type = type;
      }
      
      public String getType() {
          return type;
      }
      
      /**
       * Clone all fields of this instance to another one.
       *
       * @return Another instance with exactly the same fields
       * @throws CloneNotSupportedException clone not supported exception
       */
      @Override
      public abstract AbstractHealthChecker clone() throws CloneNotSupportedException;
      
      /**
       * Default implementation of Health checker.
       */
      public static class None extends AbstractHealthChecker {
          
          public static final String TYPE = "NONE";
      
          private static final long serialVersionUID = -760631831097384737L;
      
          public None() {
              super(TYPE);
          }
          
          @Override
          public AbstractHealthChecker clone() throws CloneNotSupportedException {
              return new None();
          }
      }
  }
  