content: package com.genersoft.iot.vmp.conf;
  
  import lombok.extern.slf4j.Slf4j;
  import org.apache.commons.lang3.ObjectUtils;
  import org.springframework.scheduling.annotation.Scheduled;
  import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
  import org.springframework.stereotype.Component;
  
  import javax.annotation.PostConstruct;
  import java.time.Instant;
  import java.util.Date;
  import java.util.Map;
  import java.util.Set;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ScheduledFuture;
  import java.util.concurrent.TimeUnit;
  
  /**
   * 动态定时任务
   * @author lin
   */
  @Slf4j
  @Component
  public class DynamicTask {
  
      private ThreadPoolTaskScheduler threadPoolTaskScheduler;
  
      private final Map<String, ScheduledFuture<?>> futureMap = new ConcurrentHashMap<>();
      private final Map<String, Runnable> runnableMap = new ConcurrentHashMap<>();
  
      @PostConstruct
      public void DynamicTask() {
          threadPoolTaskScheduler = new ThreadPoolTaskScheduler();
          threadPoolTaskScheduler.setPoolSize(300);
          threadPoolTaskScheduler.setWaitForTasksToCompleteOnShutdown(true);
          threadPoolTaskScheduler.setAwaitTerminationSeconds(10);
          threadPoolTaskScheduler.setThreadNamePrefix("dynamicTask-");
          threadPoolTaskScheduler.initialize();
      }
  
      /**
       * 循环执行的任务
       * @param key 任务ID
       * @param task 任务
       * @param cycleForCatalog 间隔 毫秒
       * @return
       */
      public void startCron(String key, Runnable task, int cycleForCatalog) {
          if(ObjectUtils.isEmpty(key)) {
              return;
          }
          ScheduledFuture<?> future = futureMap.get(key);
          if (future != null) {
              if (future.isCancelled()) {
                  log.debug("任务【{}】已存在但是关闭状态！！！", key);
              } else {
                  log.debug("任务【{}】已存在且已启动！！！", key);
                  return;
              }
          }
          // scheduleWithFixedDelay 必须等待上一个任务结束才开始计时period， cycleForCatalog表示执行的间隔
  
          future = threadPoolTaskScheduler.scheduleAtFixedRate(task, new Date(System.currentTimeMillis() + cycleForCatalog), cycleForCatalog);
          if (future != null){
              futureMap.put(key, future);
              runnableMap.put(key, task);
              log.debug("任务【{}】启动成功！！！", key);
          }else {
              log.debug("任务【{}】启动失败！！！", key);
          }
      }
  
      /**
       * 延时任务
       * @param key 任务ID
       * @param task 任务
       * @param delay 延时 /毫秒
       * @return
       */
      public void startDelay(String key, Runnable task, int delay) {
          if(ObjectUtils.isEmpty(key)) {
              return;
          }
          stop(key);
  
          // 获取执行的时刻
          Instant startInstant = Instant.now().plusMillis(TimeUnit.MILLISECONDS.toMillis(delay));
  
          ScheduledFuture future = futureMap.get(key);
          if (future != null) {
              if (future.isCancelled()) {
                  log.debug("任务【{}】已存在但是关闭状态！！！", key);
              } else {
                  log.debug("任务【{}】已存在且已启动！！！", key);
                  return;
              }
          }
          // scheduleWithFixedDelay 必须等待上一个任务结束才开始计时period， cycleForCatalog表示执行的间隔
          future = threadPoolTaskScheduler.schedule(task, startInstant);
          if (future != null){
              futureMap.put(key, future);
              runnableMap.put(key, task);
              log.debug("任务【{}】启动成功！！！", key);
          }else {
              log.debug("任务【{}】启动失败！！！", key);
          }
      }
  
      public boolean stop(String key) {
          if(ObjectUtils.isEmpty(key)) {
              return false;
          }
          boolean result = false;
          if (!ObjectUtils.isEmpty(futureMap.get(key)) && !futureMap.get(key).isCancelled() && !futureMap.get(key).isDone()) {
              result = futureMap.get(key).cancel(false);
              futureMap.remove(key);
              runnableMap.remove(key);
          }
          return result;
      }
  
      public boolean contains(String key) {
          if(ObjectUtils.isEmpty(key)) {
              return false;
          }
          return futureMap.get(key) != null;
      }
  
      public Set<String> getAllKeys() {
          return futureMap.keySet();
      }
  
      public Runnable get(String key) {
          if(ObjectUtils.isEmpty(key)) {
              return null;
          }
          return runnableMap.get(key);
      }
  
      /**
       * 每五分钟检查失效的任务，并移除
       */
      @Scheduled(cron="0 0/5 * * * ?")
      public void execute(){
          if (futureMap.size() > 0) {
              for (String key : futureMap.keySet()) {
                  ScheduledFuture<?> future = futureMap.get(key);
                  if (future.isDone() || future.isCancelled()) {
                      futureMap.remove(key);
                      runnableMap.remove(key);
                  }
              }
          }
      }
  
      public boolean isAlive(String key) {
          return futureMap.get(key) != null && !futureMap.get(key).isDone() && !futureMap.get(key).isCancelled();
      }
  }
  