Comments (2)
This evaluation throws an exception:
taskDelay[Fx.fx1[Task], Unit](()).map(_ => throw new Exception()).taskAttempt.runAsync.runSyncUnsafe(1.seconds)
While this one traps its and returns a left Either:
taskDelay[Fx.fx1[Task], Unit](()).map(_ => throw new Exception()).runAsync.attempt.runSyncUnsafe(1.seconds)
The difference is the first uses taskAttempt
Eff-combinator, while the second uses underlying monix operation on the final task.
Problem is that there are some situations where this isn't a desirable change to make in program. When using Writer
for logging, I think it is better to interpret Writer after Errors, to end up with:
val (result, logs) = program.taskAttempt.runWriter.runAsync.runSyncUnsafe(1.seconds)
But if the attempt
must be done at the end, on Task, then you'll only get logs for a successful run, and its often during errors the logs are most useful.
from eff.
I think I understand why this happens. taskAttempt
appends an attempt
call onto every existing task in the Eff expression. But the map
call doesnt wrap the exception in a task, and so (only) if it comes at the end of the chain, it'll come after the last attempt
.
The workaround is to wrap anything that could throw in a taskDelay
, which is a fair ask if you're using Task as an IO type.
from eff.
Related Issues (20)
- sbt launch script in repo is outdated
- upgrade to cats-effect 1.0.0-RC3? HOT 5
- Any plans on releasing latest version of Eff ? HOT 4
- How to use fs2.Stream compile for Eff[R, ?] ? HOT 3
- 2.13 support ? HOT 12
- Future maintenance of Eff AddOns (Twitter, Scalaz, Monix, Doobie) HOT 7
- Use scala-steward? HOT 2
- missing 5.7.0 tag on GitHub HOT 1
- Broaden maintainer set HOT 1
- Scalajs 1.x support HOT 1
- Use Mergify for automatically merge scala-steward's PRs? HOT 2
- release new version HOT 5
- migrate to GitHub Actions?
- Cats Effect 3 migration HOT 2
- "Composing ADTs" tutorial code does not work as expected HOT 2
- Widening the effects a computation HOT 9
- ConcurrentWeakIdentityHashMap issue
- update specs2 HOT 1
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- remove `-source:3.0-migration` HOT 2
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from eff.