trait Fiber[A] extends cats.effect.Fiber[Task, A]
Fiber
represents the (pure) result of a Task being started concurrently
and that can be either joined or cancelled.
You can think of fibers as being lightweight threads, a fiber being a concurrency primitive for doing cooperative multi-tasking.
For example a Fiber
value is the result of evaluating Task.start:
val task = Task.evalAsync(println("Hello!")) val forked: Task[Fiber[Unit]] = task.start
Usage example:
val launchMissiles = Task(println("Missiles launched!")) val runToBunker = Task(println("Run Lola run!")) for { fiber <- launchMissiles.start _ <- runToBunker.onErrorHandleWith { error => // Retreat failed, cancel launch (maybe we should // have retreated to our bunker before the launch?) fiber.cancel.flatMap(_ => Task.raiseError(error)) } aftermath <- fiber.join } yield { aftermath }
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def
cancel: CancelToken[Task]
Triggers the cancellation of the fiber.
Triggers the cancellation of the fiber.
Returns a new task that will complete when the cancellation is sent (but not when it is observed or acted upon).
Note that if the background process that's evaluating the result of the underlying fiber is already complete, then there's nothing to cancel.
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def
join: Task[A]
Returns a new task that will await for the completion of the underlying fiber, (asynchronously) blocking the current run-loop until that result is available.
Returns a new task that will await for the completion of the underlying fiber, (asynchronously) blocking the current run-loop until that result is available.
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