任何人都可以解释一下 lockAtLeastFor = "PT1M45S", lockAtMostFor = "PT2M" 中提到的时间，这里的 PT 是什么

Question

任何人都可以解释一下 lockAtLeastFor 和 lockAtMostFor 中定义的时间。什么是PT1M45S，它还能接受哪些参数。

  @Scheduled(cron = "0 0/2 * * * *")
  @SchedulerLock(name = "TaskScheduler_scheduledTask", lockAtLeastFor = "PT1M45S", lockAtMostFor = "PT2M")
  public void performJob()
  {
     System.out.println("executed");
  }

Answer 1

这是ISO 8601 format for duration。

您似乎正在使用 ShedLock。根据文档，它可以接受以毫秒为单位的持续时间。

/** * The lock will be held at least for X millis. Can be used if you really need to execute the task * at most once in given period of time. If the duration of the task is shorter than clock difference between nodes, the task can * be theoretically executed more than once (one node after another). By setting this parameter, you can make sure that the * lock will be kept at least for given period of time. */

long lockAtLeastFor() 默认 -1;

Answer 2

文档指出：

Can be either time with suffix like 10s or ISO8601 duration as described in {@link java.time.Duration#parse(CharSequence)}, for example PT30S.

Answer 3

也就是ISO-8601 duration format。 P 代表周期并且（可选）后跟以年 (Y)、月 (M)、周 (W) 和天 (D). T 代表时间，后面跟着一个或多个小时 (H)、分钟 (M) 和（小数）秒 (S)。

另请参阅 Duration.parse 的 javadoc。 Java 支持的持续时间格式不支持 ISO-8601 中规定的 Y、M 和 W，而是使用像 PnDTnHnMn.nS 这样的简化格式.

Answer 4

它在 ShedLock 文档中指定

Duration specification

duration+unit - 1s, 5ms, 5m, 1d (Since 4.0.0)

duration in ms - 100 (only Spring integration)

ISO-8601 - PT15M (see Duration.parse() documentation)

https://github.com/lukas-krecan/ShedLock#duration-specification

任何人都可以解释一下 lockAtLeastFor = "PT1M45S", lockAtMostFor = "PT2M" 中提到的时间，这里的 PT 是什么

Can anyone please explain about the timing mentioned in lockAtLeastFor = "PT1M45S", lockAtMostFor = "PT2M" what is PT here

java

scheduler

scheduled-tasks

spring-boot

shedlock