[html-formfu] Speed of processing

[Carl Franks]

2009/11/3 Octavian Râşniţă <orasnita at gmail.com>:
> From: "Carl Franks" <fireartist at gmail.com>
> 2009/11/2 Octavian Râşniţă <orasnita at gmail.com>:
>>
>> From: "Carl Franks" <fireartist at gmail.com>
>> ...
>>>
>>> Ok, but if each user should have its own form, then how does the cache
>>> help
>>> the users?
>>> I thought that the forms could be saved without the data they contain...
>>> only the structure of the form, without any data, which should be the
>>> same
>>> for all users.
>>> In that case the program wouldn't need to parse the config files and
>>> wouldn't need to re-generate the form object, but only set that object
>>> with
>>> the data supplied by the user. Is it possible something like this?
>>
>> Kahlil didn't say each user needed their own cache, he was describing
>> a reason why a cache that doesn't clone the form object would fail.
>>
>> Ok, but this is what I don't understand. If the form cache can contain
>> just
>> the form structure, with no other information or data or errors, then why
>> can't 2 or more users use it?
>> (Something like the use of cached TT templates by all users)
>
> 2 or more users can share it - I don't know where you got that from :)
>
> Well, I think I understand now... or not? :-)
> A user accesses the form. This creates a cached version of the form. A
> second user gets the form from the cache and adds data to it. Without
> cloning the form, the data would be stored by reference in the cache or
> something like that, and the other users would also get it.
> I just thought that once the user gets the form from the cache, no matter
> what it does to that form, his changes can't propagate back to the cache so
> no cloning was needed... I hope I understood correctly.

No, cloning IS needed :)

In perl, any object is a reference.
A cache is just a fancy name for a place to store something.
Without cloning, every user would be getting the exact same object,
and would overwrite each others internal state - submitted(),
valid_names(), errors(), etc.

$form->clone() creates a new object (a new reference) and uses
Storable::dclone() to ensure any other references, such as hashrefs,
arrayrefs are also cloned

Carl