Re: twisted

On 03/29/05 21:27, will guaraldi wrote:
> On Tue, 29 Mar 2005, Steven Armstrong wrote:
>>>
>>> I totaly agree on this. I think it would generally be good to move from 
>>> the "collection of scripts" design to a more "application" design.
>>
>> Additional note:
>> The above statement is based on my attempts writing a nevow-renderer for
>> Pyblosxom. The design of how callbacks are processed, and the way the
>> plugin system works, gave me some headaches with this.
>> 
>> I think Pyblosxom does what it's ment to do, and does that well. But I 
>> also think that it would be easier to extend/enchance it if their would 
>> me more "well known interfaces" between the different parts of the 
>> system.
> 
> Well, what do you mean by "well known interfaces" between the different 
> parts of the system?  Can you give any examples?
> 

I found it difficult to write my nevow-renderer in a generically working
way cause the plugin system is so flexible that you can do just about
anything at any time from within a plugin.
That ment that their could be special cases depending on what plugins
are loaded. The result is that I can use the nevow-renderer but it's
unlikely that anybody else, with only a slitely different setup, could
run it.

For example the comments plugin directly accesses the renderer's
outputTemplate methods. It also changes the loaded templates on the fly.
As I wanted to use a nevow-template and renderer, which work totally
different than the standard engine, this made things difficult. There's
no way I could have implemented this without hacking the comments plugin.

It would have been much easier if plugins would not change or access the
internals in such a way, and instead tell the core system to do that for
them.

If I have to hack plugins to work with changes made to the underlying
system that's IMHO a sign that "well known interfaces" are missing.
On the other hand, maybe I was just trying to do something that's
totally incompatible with Pyblosxoms design.

I don't know if this is a good example or if I was able to explains my
thoughts well enough.

cheers
Steven




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