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;
  
  import com.alibaba.nacos.naming.healthcheck.heartbeat.BeatCheckTask;
  import com.alibaba.nacos.naming.healthcheck.interceptor.HealthCheckTaskInterceptWrapper;
  import com.alibaba.nacos.naming.healthcheck.v2.HealthCheckTaskV2;
  import com.alibaba.nacos.naming.misc.GlobalExecutor;
  import com.alibaba.nacos.naming.misc.Loggers;
  
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ScheduledFuture;
  import java.util.concurrent.TimeUnit;
  
  /**
   * Health check reactor.
   *
   * @author nacos
   */
  @SuppressWarnings("PMD.ThreadPoolCreationRule")
  public class HealthCheckReactor {
      
      private static Map<String, ScheduledFuture> futureMap = new ConcurrentHashMap<>();
      
      /**
       * Schedule health check task for v2.
       *
       * @param task health check task
       */
      public static void scheduleCheck(HealthCheckTaskV2 task) {
          task.setStartTime(System.currentTimeMillis());
          Runnable wrapperTask = new HealthCheckTaskInterceptWrapper(task);
          GlobalExecutor.scheduleNamingHealth(wrapperTask, task.getCheckRtNormalized(), TimeUnit.MILLISECONDS);
      }
      
      /**
       * Schedule client beat check task with a delay.
       *
       * @param task client beat check task
       */
      public static void scheduleCheck(BeatCheckTask task) {
          Runnable wrapperTask =
                  task instanceof NacosHealthCheckTask ? new HealthCheckTaskInterceptWrapper((NacosHealthCheckTask) task)
                          : task;
          futureMap.computeIfAbsent(task.taskKey(),
                  k -> GlobalExecutor.scheduleNamingHealth(wrapperTask, 5000, 5000, TimeUnit.MILLISECONDS));
      }
      
      /**
       * Cancel client beat check task.
       *
       * @param task client beat check task
       */
      public static void cancelCheck(BeatCheckTask task) {
          ScheduledFuture scheduledFuture = futureMap.get(task.taskKey());
          if (scheduledFuture == null) {
              return;
          }
          try {
              scheduledFuture.cancel(true);
              futureMap.remove(task.taskKey());
          } catch (Exception e) {
              Loggers.EVT_LOG.error("[CANCEL-CHECK] cancel failed!", e);
          }
      }
      
      /**
       * Schedule client beat check task without a delay.
       *
       * @param task health check task
       * @return scheduled future
       */
      public static ScheduledFuture<?> scheduleNow(Runnable task) {
          return GlobalExecutor.scheduleNamingHealth(task, 0, TimeUnit.MILLISECONDS);
      }
  }
  