Re: [Jython-dev] Jython buffer protocol

[Jeff A. <ja...@fa...>]

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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