Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed2a.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.018 X-Spam-Evidence: '*H*': 0.96; '*S*': 0.00; 'falls': 0.09; 'references,': 0.09; 'url:github': 0.09; 'api': 0.11; 'cc:addr :python-list': 0.11; '(note': 0.16; '24,': 0.16; 'closures,': 0.16; 'fabio': 0.16; 'illustrate': 0.16; 'thread,': 0.16; 'top- level': 0.16; 'url:py': 0.16; 'url:pydev': 0.16; 'exception': 0.16; 'url:)': 0.16; 'thanks,': 0.17; 'wrote:': 0.18; 'wed,': 0.18; 'bit': 0.19; '(where': 0.19; 'everyone,': 0.19; 'feb': 0.22; 'email addr:gmail.com>': 0.22; 'cc:addr:python.org': 0.22; 'stick': 0.24; 'url:02': 0.24; 'looks': 0.24; 'cc:2**0': 0.24; '>': 0.26; 'references': 0.26; 'post': 0.26; 'header:In-Reply- To:1': 0.27; 'point': 0.28; 'am,': 0.29; 'related': 0.29; 'message-id:@mail.gmail.com': 0.30; "i'm": 0.30; 'code': 0.31; 'usually': 0.31; '(on': 0.31; '25,': 0.31; 'handled': 0.32; "i'd": 0.34; 'agree': 0.35; 'created': 0.35; 'test': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'version': 0.36; "didn't": 0.36; "i'll": 0.36; 'possible': 0.36; 'should': 0.36; 'so,': 0.37; 'list': 0.37; 'list.': 0.37; 'being': 0.38; 'sometimes': 0.38; 'thank': 0.38; 'though,': 0.39; 'how': 0.40; 'read': 0.60; 'manually': 0.60; 'simple': 0.61; 'back': 0.62; 'decided': 0.64; 'different': 0.65; 'url:blogspot': 0.65; 'to:addr:gmail.com': 0.65; 'worth': 0.66; 'url:br': 0.69; 'subject:Design': 0.78; '2015': 0.84; 'everywhere.': 0.84; 'subject:thought': 0.84; 'url:master': 0.84; 'convinced': 0.93 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-type; bh=SdgyJI7uJXMU6C1DZJDD7378K7fo73EoRrHokW7WUD4=; b=eIteTf8d/IavPhZomFSrrfiQ49bg+gCxdgRdGsTtIXJJAMV0Vlu4QXdNs8DXhcytSJ MjTnyB5+onHWA+3nmZ6Y8hU6psqq6R7h9LEU3NNkYXaUEsyhWmwIHPD+QOfPthyqXn1W +vwbqIUswRzI6pJDWxSenWAe6mAaN44rYmwZ2I/RYrM1hThTksdP9qqd1Je01gTvZw88 bxQMqAnwxeBO7qs9PA+0MOH1nzUX0NQQ5UZ4XUrmWriREnBYgaWEnlNI1e9fSnsKnhGh oDIuoyjy9v2yzlBO8kNNEHlJSPCnhD6vzCZvhpFzrlDdIeIYsFzQv6Jet3ovRdxko00j JsYQ== X-Received: by 10.202.79.23 with SMTP id d23mr7536325oib.45.1424995484728; Thu, 26 Feb 2015 16:04:44 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <575FE33B-D1AD-4391-B816-7440D5849C41@gmail.com> References: <33677AE8-B2FA-49F9-9304-C8D93784255D@gmail.com> <575FE33B-D1AD-4391-B816-7440D5849C41@gmail.com> From: Fabio Zadrozny Date: Thu, 26 Feb 2015 21:04:24 -0300 Subject: Re: Design thought for callbacks To: Cem Karan Content-Type: multipart/alternative; boundary=001a113b02ecac83e50510069d52 Cc: "comp.lang.python" X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 122 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1424995488 news.xs4all.nl 2848 [2001:888:2000:d::a6]:57737 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:86555 --001a113b02ecac83e50510069d52 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Wed, Feb 25, 2015 at 9:46 AM, Cem Karan wrote: > > On Feb 24, 2015, at 8:23 AM, Fabio Zadrozny wrote: > > > Hi Cem, > > > > I didn't read the whole long thread, but I thought I'd point you to wha= t > I'm using in PyVmMonitor (http://www.pyvmmonitor.com/) -- which may > already cover your use-case. > > > > Take a look at the callback.py at > https://github.com/fabioz/pyvmmonitor-core/blob/master/pyvmmonitor_core/c= allback.py > > > > And its related test (where you can see how to use it): > https://github.com/fabioz/pyvmmonitor-core/blob/master/_pyvmmonitor_core_= tests/test_callback.py > (note that it falls back to a strong reference on simple functions -- i.e= .: > usually top-level methods or methods created inside a scope -- but > otherwise uses weak references). > > That looks like a better version of what I was thinking about originally. > However, various people on the list have convinced me to stick with stron= g > references everywhere. I'm working out a possible API right now, once I > have some code that I can use to illustrate what I'm thinking to everyone= , > I'll post it to the list. > > Thank you for showing me your code though, it is clever! > > Thanks, > Cem Karan =E2=80=8BHi Cem, Well, I decided to elaborate a bit on the use-case I have and how I use it (on a higher level): http://pydev.blogspot.com.br/2015/02/design-for-client-side-applications-in= .html So, you can see if it may be worth for you or not (I agree that sometimes you should keep strong references, but for my use-cases, weak references usually work better -- with the only exception being closures, which is handled different anyways but with the gotcha of having to manually unregister it). Best Regards, Fabio=E2=80=8B --001a113b02ecac83e50510069d52 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On Wed, Feb 2= 5, 2015 at 9:46 AM, Cem Karan <cfkaran2@gmail.com> wrote:

On Feb 24, 2015, at 8:23 AM, Fabio Zadrozny <fabiofz@gmail.com> wrote:

> Hi Cem,
>
> I didn't read the whole long thread, but I thought I'd point y= ou to what I'm using in PyVmMonitor (http://www.pyvmmonitor.com/) -- which may alrea= dy cover your use-case.
>
> Take a look at the callback.py at https://github.com/fabioz/pyvmmonitor-core/blob/master/pyvmmonitor_core/= callback.py
>
> And its related test (where you can see how to use it): https://github.com/fabioz/pyvmmonitor-= core/blob/master/_pyvmmonitor_core_tests/test_callback.py (note that it= falls back to a strong reference on simple functions -- i.e.: usually top-= level methods or methods created inside a scope -- but otherwise uses weak = references).

That looks like a better version of what I was thinking about origin= ally.=C2=A0 However, various people on the list have convinced me to stick = with strong references everywhere.=C2=A0 I'm working out a possible API= right now, once I have some code that I can use to illustrate what I'm= thinking to everyone, I'll post it to the list.

Thank you for showing me your code though, it is clever!

Thanks,
Cem Karan

=E2=80=8BHi Cem,

Well, I decided to elaborate a bit = on the use-case I have and how I use it (on a higher level): http://pydev.blogspot.com.br/2015/02/design-for-client-side-application= s-in.html
=
So, you c= an see if it may be worth for you or not (I agree that sometimes you should= keep strong references, but for my use-cases, weak references usually work= better -- with the only exception being closures, which is handled differe= nt anyways but with the gotcha of having to manually unregister it).
<= div class=3D"gmail_default" style=3D"color:rgb(0,0,0)">
Best Regards,

Fabio=E2=80=8B


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