On Wed, 2004-03-31 at 12:55, Jonathan Pitcher wrote:
I have been writing OOP programs for the past couple years. Over these
years I have run into the same problem, I have solved the problem in
many different ways. I was wondering if there is a recommended way to
solve the problem I have listed below.
To keep it simple, lets say I have 3 classes. A main class, an error
class and a log class.
The classes are laid out as:
MAIN
|
||
ERROR LOG
Now I want error to write a message to the log file.
Solution 1
Store the Main class in a Session variable. And the access the
Log through main.
$_SESSION[Main]-Log-Write_Error(My Error);
Solution 2
Almost the same as above. I store main in a Session Variable but
the I create a global function to access log.
function Write_Error($Message)
{
$_SESSION[Main]-Log-Write_Error($Message);
}
This ways saves coding time because I don't have to write out the long
session reference.
I know there are more ways to do this. But every way I can think of
requires you to store the main class in a session variable to access
log. Is there a way to access a parent class or a parents parent
without doing what I did above ?
You can use a base object service class. The InterJinn framework uses
this method to access all such classes. In this way a single common and
inheritable method can be used to retrieve singleton objects, or to act
as a factory. This provides loose coupling for any given object from the
consumer of it's services. For instance:
class Exception extends BaseClass
{
function triggerError( $errorMsg )
{
// Some erroneous condition.
$log = $this-getServiceRef( 'log' );
$log-log( $errorMsg );
}
}
InterJinn does a lot of things behind the scenes in the getService()
method such as lazy loading of the source code, and lazy instantiation
of the object. This way unused services have a minimal impact on
application's performance when they are not actually needed. Hope this
helps you with your question.
Cheers,
Rob.
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