twitter util の Local

ﾛｰﾋﾞ @robey

doh! scala forgot to copy over “Local” from the twitter futures library. is there an equivalent, or am i heading to the workshop now? :)

Josh Suereth @jsuereth

@robey What was "local"?

Evan Meagher @evanm

@jsuereth @robey https://t.co/MSlYaTkAWM They're used to capture local context when composing Futures and Promises.

ﾛｰﾋﾞ @robey

@evanm @jsuereth yeah, basically thread-local for futures.

Josh Suereth @jsuereth

@robey @evanm Ah, gotcha. What we use implicits or closures for...

ﾛｰﾋﾞ @robey

@jsuereth @evanm in a service, it can be a useful way to bundle up session info for logging at deep levels without adding params everywhere

Josh Suereth @jsuereth

@robey @evanm Totally understand. That was one thing thread-local was used for that implicits *can* replace.

Josh Suereth @jsuereth

@robey @evanm Were Local's tied to the ExecutionContext you passed to futures?

Evan Meagher @evanm

@jsuereth @robey Yes. They're saved/restored on entering/leaving a future composition or monitor.

marius eriksen @marius

@evanm @jsuereth @robey this is why we put in ExecutionContext.prepare.

Josh Suereth @jsuereth

@marius @evanm @robey Ah, so there's the posibility it can be added...

marius eriksen @marius

@evanm @jsuereth @robey (which, @robey, gives you a hint about how you’d implement it.)

Scott Clasen @scottclasen

@jsuereth @marius @evanm @robey adding local/monitor was discussed a while back on the scala-sips group https://t.co/49HCJAv5rS

ﾛｰﾋﾞ @robey

@marius @evanm @jsuereth is there a trap for those who would put it inside execute()?