Collecion as collector
brian.goetz at oracle.com
Thu Apr 18 14:29:25 PDT 2013
We started here (with into(collection)) and discovered that approach had
To name one, there's no way to make it parallel without guessing at the
thread-safety of the target.
A Collector embodies information as to how to *create* a target
collection. In a parallel reduction, it may in fact create multiple
smaller collections, and then merges them into one, which can be done
safely even if the collections are not thread-safe (due to serial
thread-confinement.) This would be a sequential-only idiom, and we've
worked very hard to make all the operations on streams work well either
sequentially or parallel.
On 4/18/2013 5:07 PM, Jose wrote:
> I'm wonder why the Collection interface don't extend Collector using default
> methods. Al least a collection is the most obvious Collector you can
> This would allow adding elements to an existing collection using a
> straightforward idiom:
> Collection myCollection=..
> I have done this in custom classes that wrap a Collection and I feel it
> makes code more readable.
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