Re: [Jython-dev] Jython buffer protocol

[Jim B. <jim...@py...>]

Jeff,

Sorry, thanks for pinging about this. I will take a look today and get back
to you on that change.

Other people on this list: feel free to bug me if I miss something. I'm a
very poor implementation of a select loop - always dropping things... But
retries usually get through.

- Jim

On Wed, Aug 24, 2016 at 4:02 AM, Jeff Allen <ja...@fa...> wrote:

> Jim & all:
>
> I feel this has been sitting off to one side long enough. Do we feel safe
> that I can merge the underlying work?
>
> https://bitbucket.org/tournesol/jython-nio
>
> I'll write a short paragraph for NEWS as the last change. On a trivial
> matter of technique, that para goes above the "Jython 2.7.1rc" heading,
> ready for an rc2 heading above that when we get there, right?
>
> Jeff
>
> Jeff Allen
>
>
> On 19/07/2016 21:00, Jeff Allen wrote:
>
>> Thanks Stefan: nothing obviously crazy about the concept then.
>>
>> I'll take others' advice (Jim?) on whether this kind of change is too
>> much for 2.7.1, or feels safe.
>>
>> Concerning loops with calls in them, there's always an implementation
>> like that near the base of the hierarchy so that the non-contiguous case
>> is catered for, then the option (which I like to take up) of using a
>> bulk method in the contiguous sub-class. If we suddenly wanted to
>> support CopyTo/From ByteBuffer in the API, implementing it efficiently
>> could follow along.
>>
>> Main thing is you have your buffer protocol interface onto non-heap
>> storage to try when you can.
>>
>> Jeff
>>
>> Jeff Allen
>>
>> On 17/07/2016 15:26, Stefan Richthofer wrote:
>>
>>> Hello Jeff,
>>>
>>> sorry for the delay. I was (and still am) busy with adding NumPy support
>>> and it turned out that NumPy is okay with PyMemoryView_FromObject returning
>>> null for now (I suppose it has a fallback for that). It actually does call
>>> that method which is why I thought buffer protocol (which
>>> PyMemoryView_FromObject is based on) would be an urgent need for NumPy
>>> support. Of course I still want to add buffer protocol to JyNI, but won't
>>> find time to look at this before NumPy support moved on some more. So I did
>>> not yet take a detailed look at your work. However my main concern there
>>> would be to avoid that any index-iterating (NIO-bridge-)method would
>>> perform method calls within a loop, but instead is implemented using
>>> bulk-access methods. If this is already the case I would most likely have
>>> no further concerns.
>>> Thanks for adding getObj(); this is useful in any case.
>>>
>>> Do you think this would be bloat, nice-to-have, or really useful for
>>>> what you were hoping to do?
>>>>
>>> This sounds like it is mainly relevant for Java-integration and not so
>>> much for JyNI. Spontaneously I'd give it a "nice to have".
>>>
>>> To give you some definite clue regarding my time-management: I will
>>> resume work on BufferProtocol-front after
>>> a) Jython 2.7.1 was released
>>> b) JyNI 2.7-alpha.4 was released.
>>>
>>>
>>> Best,
>>>
>>> Stefan
>>>
>>>
>>> Gesendet: Freitag, 15. Juli 2016 um 09:42 Uhr
>>>> Von: "Jeff Allen" <ja...@fa...>
>>>> An: "Stefan Richthofer" <Ste...@gm...>
>>>> Cc: "Jython Developers" <jyt...@li...>
>>>> Betreff: Re: [Jython-dev] Jython buffer protocol
>>>>
>>>> Stefan:
>>>>
>>>> I recently pushed more changes to my bitbucket fork, including addition
>>>> of a getObj() to PyBuffer in response to your need to navigate to the
>>>> exporting object.
>>>>
>>>> The existing PyBuffer interface provides copyTo/From byte arrays. With
>>>> support for non-heap NIO storage it seems natural (and not too hard) to
>>>> add copyTo/From ByteBuffer. At present these are in the NIO
>>>> implementation, but not made interface items. Do you think this would be
>>>> bloat, nice-to-have, or really useful for what you were hoping to do?
>>>>
>>>> Jeff
>>>>
>>>> Jeff Allen
>>>>
>>>> On 13/06/2016 01:04, Stefan Richthofer wrote:
>>>>
>>>>> Hey Jeff,
>>>>> thanks a lot for this work. I will take a closer look as soon as I
>>>>> find time.
>>>>> However, so far - quickly scrolling through some source-files - it
>>>>> looks pretty good.
>>>>>
>>>>> Best
>>>>>
>>>>> Stefan
>>>>>
>>>>>
>>>>>
>>>>> Gesendet: Samstag, 11. Juni 2016 um 11:37 Uhr
>>>>>> Von: "Jeff Allen" <ja...@fa...>
>>>>>> An: "Stefan Richthofer" <Ste...@gm...>
>>>>>> Cc: "Jython Developers" <jyt...@li...>
>>>>>> Betreff: Re: [Jython-dev] Jython buffer protocol
>>>>>>
>>>>>> Stefan:
>>>>>>
>>>>>> A sane version of the nio buffer work now exists for your delight at:
>>>>>> https://bitbucket.org/tournesol/jython-nio
>>>>>>
>>>>>> <snip>
>>>>
>>>>
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