[Zope-dev] [Checkins] SVN: zope.app.publisher/trunk/ To make browsers update their caches of resources immediately when the

[Christian Zagrodnick]

Hoi,

On 2009-06-09 15:51:03 +0200, Stephan Richter 
<srichter at cosmos.phy.tufts.edu> said:

> On Tuesday 09 June 2009, Wolfgang Schnerring wrote:
>>   To make browsers update their caches of resources immediately when the
>>   resource changes, the absolute URLs of resources can now be made to
>> contain a hash of the resource's contents, so it will look like
>>   /++noop++12345/@@/myresource instead of /@@/myresource.
>>  
>>   - Implemented an AbsoluteURL adapter that computes a hash of the
>> resource's contents and inserts that into the URL. - Content hashes will
> be
>> cached in memory, except when in developer mode - Introduced a ++noop++
>> traverser that simply throws away the path segment - Wrote a bit of
>> documentation about resources
> 
> Mmmh, this looks like a lot of extra code to get behavior that is served
> 
> better with different tools. Have you looked at z3c.versionedresource and
> 
> z3c.traverser? Both of those should solve these type of use cases well.

The checkin actually is two in one (which aruably is not such a good thing):

1. Make resources compute urls with an IAbsoluteURL adapter so they 
behave like every other object.

2. Provide an optional hashing adapter (and the ++noop++ namespace).

I don't think we have to argue about 1.

The ++noop++ and hashing could easily be moved to a different package. 
The idea behind the hasing is that one should not have to think about 
new versions or cache invalidations. That's also why in development 
mode the hash is computed every time and not just once: It aids 
development a lot. But it helps in deployment as well of course.

So, why in a zope package? Because I really think this is a core issue 
of a web framework. Do we really want to not change any zope.* package 
any more in regard to new features?

Regards,
-- 
Christian Zagrodnick · cz at gocept.com
gocept gmbh & co. kg · forsterstraße 29 · 06112 halle (saale) · germany
http://gocept.com · tel +49 345 1229889 4 · fax +49 345 1229889 1
Zope and Plone consulting and development