Timer
Related Docs:
object Timer
| package effect
Returns a Clock instance associated with this timer that can provide the current time and do time measurements.
Creates a new task that will sleep for the given duration, emitting a tick when that time span is over.
Creates a new task that will sleep for the given duration, emitting a tick when that time span is over.
As an example on evaluation this will print "Hello!" after 3 seconds:
import cats.effect._ import scala.concurrent.duration._ Timer[IO].sleep(3.seconds).flatMap { _ => IO(println("Hello!")) }
Note that sleep is required to introduce an asynchronous
boundary, even if the provided timespan is less or
equal to zero.
Timer is a scheduler of tasks.
This is the purely functional equivalent of:
It provides:
It does all of that in an
Fmonadic context that can suspend side effects and is capable of asynchronous execution (e.g. IO).This is NOT a type class, as it does not have the coherence requirement.