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Posted by Markus Ernst on 09/06/05 12:29
Chung Leong wrote:
> Reference is kinda kooky in PHP 4. I always try to dissuade people
> from using it.
>
> In the book_admin constructor, you need $this->boss =& $boss.
> Otherwise the object will end up with a copy of its container.
Thank you very much for this comment - this does indeed solve the problems I
had!
Anyway my goal is improving performance at the front end (implementing PEAR
Cache did a lot there), and I am not sure if separating the admin functions
is actually worth the effort. I would highly appreciate some quick comments
about this:
Existing structure: Class trees based on common base classes, such as:
- class common_functions
- class entity extends common_functions
- class rubric extends entity
- class page extends rubric
- class gallery extends entity
- class picture extends entity
Class common_functions contains some methods used for display and lots of
methods used for administration (such as string formatting, outputting form
fields and other stuff), and also integrates the database, language and
configuration objects.
Class entity controls the dependencies between it's sub-objects.
Class entity and it's subclasses all have 1 method for retrieving data and 3
methods for administration (create/update, duplicate, delete).
Thus, also for the front-end scripts all the administration methods are
loaded. So I thought of 2 possible levels of separation:
1. The admin methods are separated only from class common_functions and
integrated as a separate object. The $boss reference can be avoided there,
as those methods do either directly address the database or return values
instead of setting class properties. But the admin methods of the
sub-objects will still be loaded by the front-end scripts.
2. The admin methods are separated from all classes and build a separate
class tree:
- class entity_admin extends common_functions_admin
- class rubric extends entity_admin
and so on; the the main tree subclass constructor tells it's parents which
admin class has to be loaded.
I implemented solution 2 now and compared the execution times of the most
time-consuming front-end page (a gallery overview, creates 1 entity, rubric,
page and gallery object and 28 picture objects for the thumbnails). There is
no significant difference; it takes between 2.0 and 2.3 seconds[1] (without
caching of course). On the other side, the admin scripts run slower.
[1] Yes, I have some more ideas where to reduce server load...
So what I would like to know is: Does it make a significant difference if
only about 200 lines of code are loaded instead of about 1000 lines? Or is a
possible performance gain compensated by the more complex structure?
Now this has got a lot of text - if somebody takes his/her time to give me a
comment about it: Thanks a lot in advance!
Markus
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