[EP-tech] Re: Altering DajaObj/Eprint.pm behaviour without altering core code

Tim Brody tdb2 at ecs.soton.ac.uk
Wed Apr 4 17:31:50 BST 2012


You may want to backport EP_TRIGGER_REMOVED from trunk.

eprint_status_change is called when an eprint is moved (but you can't
programmatically block the move).

Cheers,
Tim.

On Wed, 2012-04-04 at 16:44 +0100, John Salter wrote:
> For render_fileinfo Tim's suggestion would be OK, but what about non-rendering methods - like 'remove'?
> Currently in a modified ~/perl_lib/EPrints/DataObj/Eprint.pm, I have:
> 
> sub remove
> {
> ...
> 
> #JLRS Added code
>     my $repo = $self->{session}->get_repository->get_id;
>     if( $repo eq "sherpawhiterose" ){
> 	# some stuff that's only applicable to 'sherpawhiterose'
> 	...
>     }
> #/JLRS Added code
> 
> 	return $success;
> }
> 
> Ideally this would be done somewhere in ~/archives/sherpawhiterose/cfg/, and not affect any other archives.
> Could I wrap a set of rules with some kind of archive-specific selector:
> [in this archive]
> 	*EPrints::DataObj::EPrint::remove = \&patched_DataObj_EPrint_remove;
> 	*EPrints::DataObj::EPrint::move_to_archive = \&patched_DataObj_EPrint_move_to_archive;
> [/in this archive]
> 
> Cheers,
> John
> 
> -----Original Message-----
> From: eprints-tech-bounces at ecs.soton.ac.uk [mailto:eprints-tech-bounces at ecs.soton.ac.uk] On Behalf Of Sebastien Francois
> Sent: 04 April 2012 16:05
> To: eprints-tech at ecs.soton.ac.uk
> Subject: [EP-tech] Re: Altering DajaObj/Eprint.pm behaviour without altering core code
> 
> On 04/04/12 15:49, John Salter wrote:
> > I really meant to suggest making the change in ~/archives/[ID]/cfg/cfg.d/core_overrides.pl
> >   - would a change in there result in this inheritance?
> I think it would since EPrints::DataObj::EPrint.pm is loaded once by the 
> webserver and you're changing it.
> 
> What about Tim Brody's suggestion? That would be rather clean.
> 
> Alternatively, try something like that:
> 
> *EPrints::DataObj::EPrint::render_fileinfo = \&patched_render_fileinfo;
> 
> 
> sub patched_render_fileinfo
> {
> 	my( $session, $field, $value, $alllangs, $nolink, $eprint ) = @_;
> 
> 	if( $session->can_call( 'local_render_fileinfo' ) )
> 	{
> 		return $session->call( 'local_render_fileinfo', $session, $field, $value, $alllangs, $nolink, $eprint );
> 	}
> 
> 	# original render_fileinfo code follows:
> 	# ...
> }
> 
> $c->{local_render_fileinfo} = sub {
> 
> 	# your custom code
> 
> };
> 
> 
> 
> If you don't define $c->{local_render_fileinfo} in your other 
> repositories, then the original code will be executed.
> 
> Seb.
> 
> > I need to make the change in one archive only!
> >
> > Cheers,
> > John
> >
> > -----Original Message-----
> > From: eprints-tech-bounces at ecs.soton.ac.uk [mailto:eprints-tech-bounces at ecs.soton.ac.uk] On Behalf Of Sebastien Francois
> > Sent: 04 April 2012 15:41
> > To: eprints-tech at ecs.soton.ac.uk
> > Subject: [EP-tech] Re: Altering DajaObj/Eprint.pm behaviour without altering core code
> >
> > Good! Yes I'd add a file in cfg.d/ as you suggested. However be aware
> > that other repositories set up there (ie. archives/[id1],
> > archives/[id2]...) will inherit the change!
> >
> > Seb.
> >
> > On 04/04/12 15:33, John Salter wrote:
> >> Thanks Seb, works like a dream!
> >>
> >> Do you have any 'good practice' advice on how to do this within an archive?
> >> I already have ~/archives/[ID]/cfg/plugins/... for over-riding plugins.
> >> Would your advice be to add something within there, or to add something like cfg.d/core_overrides.pl?
> >>
> >> Cheers,
> >> John
> >>
> >> -----Original Message-----
> >> From: eprints-tech-bounces at ecs.soton.ac.uk [mailto:eprints-tech-bounces at ecs.soton.ac.uk] On Behalf Of Sebastien Francois
> >> Sent: 04 April 2012 12:29
> >> To: eprints-tech at ecs.soton.ac.uk
> >> Subject: [EP-tech] Re: Altering DajaObj/Eprint.pm behaviour without altering core code
> >>
> >> What about:
> >>
> >> *EPrints::DataObj::EPrint::render_fileinfo = \&my_render_fileinfo;
> >>
> >> sub my_render_fileinfo
> >> {
> >> # your code ...
> >> }
> >>
> >> Seb.
> >>
> >>
> >> On 04/04/12 12:18, John Salter wrote:
> >>> I'm trying to do something the 'right way'*.
> >>> This advice: http://wiki.eprints.org/w/Read_Only_Directories says I shouldn't be editing anything under eprints3/perl_lib/ (with a couple of exceptions).
> >>>
> >>> I need to alter the 'render_fileinfo' subroutine in ~/perl_lib/EPrints/DataObj/EPrint.pm.
> >>> How do I achieve this without:
> >>>     - altering the Eprint.pm file
> >>>     - ending up with some 'Subroutine render_fileinfo redefined' messages
> >>>     - using "no warnings 'redefine';" ;o)
> >>>
> >>> I've tried various attempts - without success.
> >>> I'm sure it can be done, and I'm sure it's a bit of perl magic I'm missing, and hopefully someone here can help!
> >>>
> >>> Cheers,
> >>> John
> >>>
> >>> *http://blogs.ecs.soton.ac.uk/oneshare/2009/09/25/taking-stock-and-mopping-up-the-mess-i-made-of-eprints/
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> >>
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> >
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> 
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