Local in scala.concurrent

[mikael....@magine.com]

Does scala.concurrent have something equivalent to Local in Twitter utils (https://twitter.github.io/util/docs/#com.twitter.util.Local)?

In other words, is there any way to have something like Java's ThreadLocal which follows the application flow (rather than JVM threads) when using scala.concurrent.Future?

[Jasper-M]

I think http://www.scala-lang.org/api/2.11.8/#scala.util.DynamicVariable is a wrapper around ThreadLocal.

Op dinsdag 21 juni 2016 15:51:40 UTC+2 schreef mikael....@magine.com:

[mikael....@magine.com]

As far as I can see, this does not integrate into Scala's Futures like Twitter's Local do (into Twitter's Futures).

[Naftoli Gugenheim]

On Tue, Jun 21, 2016, 9:51 AM <mikael....@magine.com> wrote:

Does scala.concurrent have something equivalent to Local in Twitter utils (https://twitter.github.io/util/docs/#com.twitter.util.Local)?

In other words, is there any way to have something like Java's ThreadLocal which follows the application flow (rather than JVM threads) when using scala.concurrent.Future?

Not familiar with Local, but in general in Scala the way to pass things using statically rather than dynamically scoped values is to use parameters, making them implicit when appropriate (e.g., writing then out makes the code less readable, and the types distinguish them well enough).

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[Daniel Armak]

For something like Local that follows execution wherever it goes, you would have to pass the implicit parameter to every function ever called (or, at least, every higher order function). That's clearly impractical.

Daniel Armak

[Viktor Klang]

One also needs to remember that that Local propagation needs to be done at all Thread-jumps otherwise things go awry. Since there are tons of libraries which do not support Locals, it does seem like a very fragile solution.

:/

Cheers,

√

[mikael....@magine.com]

I created an issue about this: https://issues.scala-lang.org/browse/SI-9835

On Tuesday, June 21, 2016 at 3:51:40 PM UTC+2, mikael....@magine.com wrote: