Updated SotL/L documents for Iteration 2

Talden talden at gmail.com
Mon Sep 10 17:41:16 PDT 2012

FYI, the list-manager gives the following URL for the list archives:

However that page says the archive is empty (desite the fact that it
clearly isn't).

Anyone have any idea what the story is?

Aaron Scott-Boddendijk

On Tue, Sep 11, 2012 at 6:02 AM, Brian Goetz <brian.goetz at oracle.com> wrote:
> Duh, I forgot attachments are not permitted on this list :(
> I sent them to lambda-libs-spec-experts, you can see the mangled version
> of the attachments here:
> http://mail.openjdk.java.net/pipermail/lambda-libs-spec-experts/2012-September/000000.html
> Meanwhile I'll come up with a better place to stash them.
> On 9/10/2012 1:51 PM, Brian Goetz wrote:
>> We're now almost finished prototyping Iteration 2 of the Lambda
>> Libraries APIs; they are still in an experimental branch in the openjdk
>> lambda repo (it2-bootstrap), but will be moved into the default branch
>> (still of the lambda repo) in the next few days.
>> The attached documents describe the approach taken in Iteration 2, and
>> the changes since Iteration 1.  There are still plenty of open issues to
>> discuss, and I'll be discussing them on the EG list.
>> Several significant API changes between Iterations 1 and 2:
>>    - In Iteration 1, stream operations were injected directly into
>> Iterable; now Stream is its own entity, which is much more like an
>> Iterator rather than an Iterable.
>>    - There are now stream "accessor" methods on Collection and friends;
>> instead of sayng collection.filter(...)..., you now have to say
>> collection.stream().filter(...) or collection.parallel().filter(...).
>>    - The multiplicity of interfaces (Stream, StreamOps, Streamable,
>> ParallelStream, ParallelStreamable, etc) has been collapsed
>> dramatically, down to one Stream interface for each shape (list-shaped,
>> map-shaped).  The serial/parallel-ness of a stream is now a dynamic
>> rather than static property.
>>    - Most terminal operations are performed by forEach'ing elements into
>> a "sink" rather than pulling elements from an Iterator.
>>    - There is an extensible API for adding new stream operations besides
>> the built-in ones, although this API will likely not be exposed in JDK 8
>> (needs more bake time.)
>> As usual, the implementation and API are in varying states of
>> "done"-ness; the general shape and set of operations is fairly baked,
>> but many of the implementation details and internal APIs (such as
>> StreamAccessor, ParallelOp, ParallelHelper) are mostly stabs in the
>> dark, and there are bits we know we have to fix that have just not yet
>> been fixed as we've been focusing on the high-order bits.
>> Start with Stream, MapStream and Streamable -- that's most of the
>> exposed API right there (and the most baked part.)

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