```fun mytimer() = Schedule.forever<String>(...

# arrow

[Jörg Winter]

fun mytimer() = Schedule.forever<String>().delay { duration ->
    Duration.Companion.seconds(5)
}

Hi all,
What is the input argument 'duration'.. when has it a value other than 0s (in this example it is always 0s) ?

[simon.vergauwen]

Hey @Jörg Winter,

It depends on the constructor used. Schedule.forever is the equivalent of while(true).

In contrast Schedule.spaced(5.seconds) is Schedule.forever with a constant delay in between every loop of 5s.

Schedule.linear(5.seconds) builds a linear delay schedule with an initial value of 5.seconds.

[Jörg Winter]

thx, so I got this nice contruction working

@OptIn(ExperimentalTime::class)
fun mytimer() = Schedule.linear<Unit>(1.seconds).modify { n, duration ->
    val nextDuration = duration.plus(1.seconds) // or determine next duration however you want...
    nextDuration
}

[Jörg Winter]

this would be like linear backoff

[simon.vergauwen]

That is what the linear constructor already does. It relies on forever which outputs the count of it's iteration and multiplies it with the base = 1.seconds.

delayed(forever<A>().map { base * it })

[simon.vergauwen]

The idea of Schedule is that it already exposes most of the things you need, and you can compose different pieces together. I.e. Schedule.linear(1.seconds).jittered() and Schedule.recurs(5) will have a jittered linear back-off delay, with a max of 5 tries.

So if you use it as Schedule.linear(1.seconds).jittered() and Schedule.recurs(5).retry { f() } it will retry f 5 times with a jittered linear back-off.