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.misc.Loggers;
  
  import java.util.Map;
  import java.util.concurrent.*;
  
  /**
   * @author nacos
   */
  public class HealthCheckReactor {
  
      private static final ScheduledExecutorService EXECUTOR;
  
      private static Map<String, ScheduledFuture> futureMap = new ConcurrentHashMap<>();
  
      static {
  
          int processorCount = Runtime.getRuntime().availableProcessors();
          EXECUTOR
                  = Executors
                  .newScheduledThreadPool(processorCount <= 1 ? 1 : processorCount / 2, new ThreadFactory() {
                      @Override
                      public Thread newThread(Runnable r) {
                          Thread thread = new Thread(r);
                          thread.setDaemon(true);
                          thread.setName("com.alibaba.nacos.naming.health");
                          return thread;
                      }
                  });
      }
  
      public static ScheduledFuture<?> scheduleCheck(HealthCheckTask task) {
          task.setStartTime(System.currentTimeMillis());
          return EXECUTOR.schedule(task, task.getCheckRTNormalized(), TimeUnit.MILLISECONDS);
      }
  
      public static void scheduleCheck(ClientBeatCheckTask task) {
          futureMap.putIfAbsent(task.taskKey(), EXECUTOR.scheduleWithFixedDelay(task, 5000, 5000, TimeUnit.MILLISECONDS));
      }
  
      public static void cancelCheck(ClientBeatCheckTask task) {
          ScheduledFuture scheduledFuture = futureMap.get(task.taskKey());
          if (scheduledFuture == null) {
              return;
          }
          try {
              scheduledFuture.cancel(true);
          } catch (Exception e) {
              Loggers.EVT_LOG.error("[CANCEL-CHECK] cancel failed!", e);
          }
      }
  
  
      public static ScheduledFuture<?> scheduleNow(Runnable task) {
          return EXECUTOR.schedule(task, 0, TimeUnit.MILLISECONDS);
      }
  }
  