perl-modperl mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Praveen Ray <praveen...@yahoo.com>
Subject Re: Apache::Singleton (sharing one object)
Date Fri, 12 Aug 2005 14:18:16 GMT
Shouldn't you be using the database itself to store the
state? Will Apache::Singleton instance replicate itself if
you were to run your application on multiple servers behind
load balancers (for scalability and fail-over purposes)?
If yes, you probably should usw Storage Module to save your
SQL object and retrieve in each request. That would be
'true' singleton, in my opinion.


--- "Tesfaiesus, Mesel" <mesel@hp.com> wrote:

> Hi, 
> 
> I'm trying to write an application, that allows the user
> to generate
> complex SQL Queries step by step.  
> Therefore I need to make the same SQL-object available
> over many
> requests. 
> 
> I'm using the Aapache::Singleton Module and mod_perl
> 2.x/Apache2.x but I
> always seem to get a new Object as the properties are set
> to default
> every time.
> 
> 
> My Testcode is printing out a $counter - which it saved
> as an attribute
> of the object - that's supposed to increment with every
> request:
> 
> ###############   MyClass Module ###################
> 
>  package MyClass;
> 
>  use base qw (Apache::Singleton);
> 
>  {
>  	Sub _new_instance {
> 		my $class = shift;
> 				
> 		my $self = {};
> 		bless $self, $class;
> 
> 		$self->setProperty( 'counter', 1);
> 
> 	}	
>  }
> 
> #####################################################
> 
> 
> 
> 
> ################   Script: index.pl  ################
> 
>  Use MyClass;
> 
>  my $instance = MyClass->instance();
> 
>  my $counter = 0;
> 
>  $counter = $instance->getProperty('counter');
> 
>  print $counter;
> 
>  $counter++;
> 
>  $instance->setProperty('counter', $counter);
> 
> ######################################################
> 
> 
> 
> The result is always 1. it doesn't increment. What am I
> doing wrong?
> 
> Any comment is appreciated.
> 
> Cheers,
> mesel
> 


  - Praveen  

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 

Mime
View raw message