ConcurrentHashMap/ConcurrentMap/Map.compute

[Brian Goetz]

>> Messy (for you) but probably the most option-preserving choice.
>
> Any preferences about which form? I omitted seq forms in
> current version so as to release the par ones without
> stalling over whether they'd be segregated under something
> sharing common interface. But now that this option seems out
> (no MapStreams) I'm left with the usual choices of how
> to name and/or parameterize them. Probably:
>     forEach{Key,Value,Entry,<mapping>}Sequentially /
> forEach{...}InParallel
>     reduce{...}Sequentially / reduce{...}InParallel
>     search{...}Sequentially / search{...}InParallel

Seems reasonable.  I'd suggest leaving off Sequentially but you'll just 
ignore that :)