Problem only arises with Clojure 1.7 + Java 1.6.
/usr/lib/jvm/*java-8-oracle*/jre/bin/java -jar
~/.m2/repository/org/clojure/clojure/1.7.0-beta3/*clojure-1.7.0-beta3*.jar
Clojure 1.7.0-beta3
user=> (->> (map vector (java.util.EnumSet/allOf
java.util.concurrent.TimeUnit) (range)) (into {}) (java.util.EnumMap.)
(.entrySet) (map str) (into []))
["NANOSECONDS=0" "MICROSECONDS=1" "MILLISECONDS=2" "SECONDS=3" "MINUTES=4"
"HOURS=5" "DAYS=6"]
/usr/lib/jvm/*java-7-oracle*/jre/bin/java -jar
~/.m2/repository/org/clojure/clojure/1.7.0-beta3/*clojure-1.7.0-beta3*.jar
Clojure 1.7.0-beta3
user=> (->> (map vector (java.util.EnumSet/allOf
java.util.concurrent.TimeUnit) (range)) (into {}) (java.util.EnumMap.)
(.entrySet) (map str) (into []))
["NANOSECONDS=0" "MICROSECONDS=1" "MILLISECONDS=2" "SECONDS=3" "MINUTES=4"
"HOURS=5" "DAYS=6"]
/usr/lib/jvm/*java-6-oracle*/bin/java -jar
~/.m2/repository/org/clojure/clojure/1.7.0-beta3/*clojure-1.7.0-beta3*.jar
Clojure 1.7.0-beta3
user=> (->> (map vector (java.util.EnumSet/allOf
java.util.concurrent.TimeUnit) (range)) (into {}) (java.util.EnumMap.)
(.entrySet) (map str) (into []))
["DAYS=6" "DAYS=6" "DAYS=6" "DAYS=6" "DAYS=6" "DAYS=6" "DAYS=6"]
--Leif
On Tuesday, May 26, 2015 at 8:39:14 PM UTC-4, Daniel wrote:
>
> Got where I could try it and instantly became very confused.
>
> Just...take a look. http://imgur.com/4LgBdCY
>
> On Tuesday, May 26, 2015 at 6:25:04 PM UTC-5, Marshall Bockrath-Vandegrift
> wrote:
>>
>> The difference is that the original behavior allowed room to transform
>> the mutated object into an object which *could* be safely cached in a
>> "downstream" seq, while the new behavior pumps the iterator through 32
>> mutations before user-level code has a chance to see it. Contrived example
>> using the Java standard libary:
>>
>> Clojure 1.6.0:
>> (->> (map vector (java.util.EnumSet/allOf java.util.concurrent.TimeUnit)
>> (range)) (into {}) (java.util.EnumMap.) (.entrySet) (map str) (into []))
>> #=> ["NANOSECONDS=0" "MICROSECONDS=1" "MILLISECONDS=2" "SECONDS=3"
>> "MINUTES=4" "HOURS=5" "DAYS=6"]
>>
>> Clojure 1.7.0-RC1:
>> (->> (map vector (java.util.EnumSet/allOf java.util.concurrent.TimeUnit)
>> (range)) (into {}) (java.util.EnumMap.) (.entrySet) (map str) (into []))
>> #=> ["DAYS=6" "DAYS=6" "DAYS=6" "DAYS=6" "DAYS=6" "DAYS=6" "DAYS=6"]
>>
>> IMHO the latter behavior demonstrates a mismatch where chunked seqs and
>> iterators are simple incompatible.
>>
>> On Tue, May 26, 2015 at 5:33 PM Alex Miller <al...@puredanger.com> wrote:
>>
>>> In what way is it broken? Both before and after wrapped a mutable
>>> iterator into a caching seq. The new one is different in that it chunks so
>>> reads 32 at a time instead of 1. However combining either with other
>>> chunking sequence operations would have the same effect which is to say
>>> that using that mutable iterator with anything else, or having expectations
>>> about its rate of consumption was as dubious before as it is now.
>>>
>>> Unless of course I misunderstand your intent, which possible because I
>>> am on a phone without easy access to look further at the commit and am
>>> going by memory.
>>>
>>>
>>>
>>> On May 26, 2015, at 2:17 PM, Marshall Bockrath-Vandegrift <
>>> lla...@gmail.com> wrote:
>>>
>>> Some of my code is broken by
>>> commit c47e1bbcfa227723df28d1c9e0a6df2bcb0fecc1, which landed in
>>> 1.7.0-alpha6 (I lasted tested with -alpha5 and have been unfortunately busy
>>> since). The culprit is the switch to producing seqs over iterators as
>>> chunked iterators. This would appear to break seq-based traversal of any
>>> iterator implementing the not-uncommon Java pattern of mutating and
>>> re-yielding the same object on each `next()` invocation.
>>>
>>> I'm unable to find an existing ticket for this apparent-regression.
>>> Should I create one, or did I miss the existing ticket, or is there some
>>> mitigating issue which makes this a non-problem?
>>>
>>> Thanks.
>>>
>>> -Marshall
>>>
>>> On Thu, May 21, 2015 at 12:31 PM Alex Miller <al...@puredanger.com>
>>> wrote:
>>>
>>>> Clojure 1.7.0-RC1 is now available.
>>>>
>>>> Try it via
>>>> - Download:
>>>> https://repo1.maven.org/maven2/org/clojure/clojure/1.7.0-RC1/
>>>> - Leiningen: [org.clojure/clojure "1.7.0-RC1"]
>>>>
>>>> The only change since 1.7.0-beta3 is CLJ-1706, which makes reader
>>>> conditional splicing an error at the top level (previously it would
>>>> silently drop all but the first spliced element).
>>>>
>>>> For a full list of changes since 1.6.0, see:
>>>> https://github.com/clojure/clojure/blob/master/changes.md
>>>>
>>>> Please give it a try and let us know if things are working (or not).
>>>> The more and quicker feedback we get, the sooner we can release 1.7.0
>>>> final!
>>>>
>>>> - Alex
>>>>
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>>
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