Is it possible to return from a function only after timer is ended?

Setup, Configuration and Use Scripts & Rules
1

I want to implement reusable timers within a function. The function should return after timer is ended not before. Any idea?

my code with as lot of debug, sorry:

var HashMap<String, Timer> RandomTimers = newHashMap()

val Functions$Function2<GenericItem, HashMap<String, Timer>, String> randomTimerLambdaTest= [ s, RandomTimers  |
    logInfo("TIMERCHECK", "lambda before timer: " + s.name)

    RandomTimers.put(s.name, createTimer(now.plusSeconds(120))
    [|
        logInfo("TIMERCHECK", "lambda TimerEnded: " + s.name)
        RandomTimers.put(s.name, null)
    ])

    logInfo("TIMERCHECK", "lambda after timer:" + s.name)
    s.state.toString + " logged"
]

rule "Time random swRandomTimer02 start"
    when
        Item swRandomTimer02 changed to ON
    then
        var String result=randomTimerLambdaTest.apply(swRandomTimer02, RandomTimers)
        logInfo("TIMERCHECK", "randomTimerLambdaResult: " + result)
        swRandomTimer02.postUpdate(OFF)
end

and the log:

2018-02-05 16:34:32.032 [INFO ] [se.smarthome.model.script.TIMERCHECK] - lambda before timer: swRandomTimer02
2018-02-05 16:34:32.046 [INFO ] [se.smarthome.model.script.TIMERCHECK] - lambda after timer:swRandomTimer02
2018-02-05 16:34:32.046 [INFO ] [se.smarthome.model.script.TIMERCHECK] - randomTimerLambdaResult: ON return form lambda
2018-02-05 16:36:32.047 [INFO ] [se.smarthome.model.script.TIMERCHECK] - lambda TimerEnded: swRandomTimer02

I can see, that the function returns right after creating timer. Is there a way to return only if timer is ended?

2

The answer is yes, Thread::sleep.

But you really don’t want to do this. Any sleep longer than half a second is going to increase the likelihood that you will run into problems of your Rules locking up or becoming laggy.

You should create a Timer and put the code that is supposed to run later inside the body of the Timer and not block the execution of your Rule.