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.naming.healthcheck.extend;
  
  import com.alibaba.nacos.api.naming.pojo.healthcheck.AbstractHealthChecker;
  import com.alibaba.nacos.api.naming.pojo.healthcheck.HealthCheckType;
  import com.alibaba.nacos.common.spi.NacosServiceLoader;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.stereotype.Component;
  
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.Set;
  
  /**
   * Health check extend provider.
   *
   * @author XCXCXCXCX
   */
  @Component
  public class HealthCheckExtendProvider {
      
      private static final Logger LOGGER = LoggerFactory.getLogger(HealthCheckExtendProvider.class);
  
      private final Collection<AbstractHealthChecker> checkers = NacosServiceLoader.load(AbstractHealthChecker.class);
  
      private AbstractHealthCheckProcessorExtend healthCheckProcessorExtend;
  
      public void setHealthCheckProcessorExtend(AbstractHealthCheckProcessorExtend healthCheckProcessorExtend) {
          this.healthCheckProcessorExtend = healthCheckProcessorExtend;
      }
  
      public void init() {
          loadExtend();
      }
      
      private void loadExtend() {
          Iterator<AbstractHealthChecker> healthCheckerIt = checkers.iterator();
          
          Set<String> origin = new HashSet<>();
          for (HealthCheckType type : HealthCheckType.values()) {
              origin.add(type.name());
          }
          Set<String> processorType = healthCheckProcessorExtend.addProcessor(origin);
          Set<String> healthCheckerType = new HashSet<>(origin);
          
          while (healthCheckerIt.hasNext()) {
              AbstractHealthChecker checker = healthCheckerIt.next();
              String type = checker.getType();
              if (healthCheckerType.contains(type)) {
                  throw new RuntimeException(
                          "More than one healthChecker of the same type was found : [type=\"" + type + "\"]");
              }
              healthCheckerType.add(type);
              HealthCheckType.registerHealthChecker(checker.getType(), checker.getClass());
          }
          if (!processorType.equals(healthCheckerType)) {
              throw new RuntimeException(
                      "An unmatched processor and healthChecker are detected in the extension package.");
          }
          if (processorType.size() > origin.size()) {
              processorType.removeAll(origin);
              LOGGER.debug("init health plugin : types=" + processorType);
          }
      }
  }
  