Future
examples.
sbt compile
$ sbt 'run -threads 1 -items 4'
[...]
[info] Running com.nkouevda.future.Main -threads 1 -items 4
1523830731136: run-main-0: scheduling 0
1523830731140: pool-6-thread-1: sleeping
1523830731142: run-main-0: scheduling 1
1523830731142: run-main-0: scheduling 2
1523830731142: run-main-0: scheduling 3
1523830731142: run-main-0: awaiting
1523830732142: pool-6-thread-1: finished sleeping
1523830732143: pool-6-thread-1: sleeping
1523830733148: pool-6-thread-1: finished sleeping
1523830733148: pool-6-thread-1: sleeping
1523830734153: pool-6-thread-1: finished sleeping
1523830734153: pool-6-thread-1: sleeping
1523830735158: pool-6-thread-1: finished sleeping
1523830735159: run-main-0: finished awaiting
[success] Total time: 5 s, completed Apr 15, 2018 3:18:55 PM
$ sbt 'run -threads 4 -items 4'
[...]
[info] Running com.nkouevda.future.Main -threads 4 -items 4
1523830741602: run-main-0: scheduling 0
1523830741606: pool-6-thread-1: sleeping
1523830741608: run-main-0: scheduling 1
1523830741608: pool-6-thread-2: sleeping
1523830741608: run-main-0: scheduling 2
1523830741609: run-main-0: scheduling 3
1523830741609: pool-6-thread-3: sleeping
1523830741609: run-main-0: awaiting
1523830741609: pool-6-thread-4: sleeping
1523830742609: pool-6-thread-2: finished sleeping
1523830742609: pool-6-thread-4: finished sleeping
1523830742609: pool-6-thread-3: finished sleeping
1523830742609: pool-6-thread-1: finished sleeping
1523830742611: run-main-0: finished awaiting
[success] Total time: 2 s, completed Apr 15, 2018 3:19:02 PM