openHAB规则中的变量cron

Question

为了从GUI中设置一个警报，我想将一个变量作为参数传递给cron。

这样做是可行的：

rule "Wake up"
when
  Time cron "00 00 06 * * ?"
then
  // ...
end

这样做是行不通的：

var morning = "00 00 06 * * ?"

rule "Wake up"
when
  Time cron morning
then
  // ...
end

这应该是可能的吗？

Answer 1

无法更改Cron字符串，但我使用这段代码来绕过它：

import org.joda.time.Duration
import org.quartz.CronExpression

var Timer wateringtimer = null

// Start watering at 03:00 AM, all days except Saturday (5)                               
val wateringCronString = "0 0 3 ? * 1,2,3,4,5,6"
...
rule "Set Cron" 
...
var cronExpression = new CronExpression(wateringCronString)
var triggerTime = cronExpression.getNextValidTimeAfter(now.plusMinutes(1).toDate)
Seconds::secondsBetween(now,new DateTime(triggerTime)).getSeconds()
if (watertimer !== null) 
  watertimer.cancel()

wateringtimer = createTimer(now.plusSeconds(diff),
    [
        ...Do something... 
    ])