Into

[Doug Lea]

On 12/22/12 17:24, Remi Forax wrote:
> On 12/22/2012 09:21 PM, Doug Lea wrote:
>> For mutative additions to collections/maps, why not
>> just let people use either forEach(...add...)  or
>> parallel-forEach(...add..),
>
> Your asking people to take car about the concurrency in their code instead of
> letting the pipeline taking care of that.

Only for mutative updates, for which they will need to take
the same care in any choice of seq vs par for any use of forEach.
So there is nothing much special/interesting about this.
The main idea is to be uniform about how mutative constructions
are less fluent/streamy-looking than functional usages.

>>
>> For more functional/fluent/streamy usages, you'd like
>> to enforce that any into-ish method creates a fresh instance
>> and that construction cannot interfere with anything else.
>> So why not treat these as factories in existing catgories:
>>   toCollection(), toList(), toRandomAccessList()
>>   toSet(), toNavigableSet();
>> plus grouping versions
>>   toMap(keyfn, ...), toNavigableMap(keyFn, ...);
>> (with merge- and multi- variants.)
>>ion upon creation but not once published.
> ...
> you can't use arrayList.addAll(arrayList2) ?

Only if ArrayList had a build-in-parallel method/mode.
Which it could.

-Doug