9.4.4. 取消计划任务

分布式调度任务服务提供了两张取消任务的方式：通过调用ScheduledFuture.cancel()方法或调用RScheduledExecutorService.cancelScheduledTask方法。通过对Thread.currentThread().isInterrupted()方法的调用可以在已经处于运行状态的任务里实现任务中断：

public class RunnableTask implements Callable<Long> {
    @RInject
    private RedissonClient redissonClient;
    @Override
    public Long call() throws Exception {
        RMap<String, Integer> map = redissonClient.getMap("myMap");
        Long result = 0;
        // map里包含了许多的元素
        for (Integer value : map.values()) {
           if (Thread.currentThread().isInterrupted()) {
                // 任务被取消了
                return null;
           }
           result += value;
        }
        return result;
    }
}
RScheduledExecutorService executorService = redisson.getExecutorService("myExecutor");
RScheduledFuture<Long> future = executorService.scheduleAsync(new RunnableTask(), CronSchedule.dailyAtHourAndMinute(10, 5));
// ...
future.cancel(true);
// 或
String taskId = future.getTaskId();
// ...
executorService.cancelScheduledTask(taskId);