[Catalyst] Global 'helper' methods
Hugh Barnard
hugh.barnard at gmail.com
Tue Oct 30 16:35:26 GMT 2012
Hi Craig, See below...
On 30 October 2012 16:15, Craig Chant <craig at homeloanpartnership.com> wrote:
> Hi Hugh,
>
>
>
> I assume this is for Apache and I=92m running IIS7, so I guess it isn=92t
> compatible?
>
Although Japanese is a 'somewhat' family language, I can't read most of the
text in this:
http://d.hatena.ne.jp/xaicron/ but it looks like an install of the
'mother' non-Apache module to Windows with Strawberry Perl. Obviously your
mileage may vary, but if you get anywhere, you'd be something of a pioneer
too, tell everyone.
>
>
> =93It looks like I've been having performance problems because millions of
> rows get blessed into objects, not sure of this but it looks like a DBIC
> thing at the moment.=94
>
>
>
> That=92s not good, and is part of the issue of ORM (so I=92ve read), I=
=92m not
> as old as you, but I=92m still old school, get only the columns and rows =
you
> need when you need them, well that=92s my take on it and it seems to work=
for
> me.
>
Depends, DBIC is often really 'natural' and less hand-coding but, like
everything, I think its limits need to be understood. For high performance
on big datasets, hand-rolled seems intuitively better in some cases.
>
>
> Regards,
>
>
>
> Craig.
>
>
>
> *From:* Hugh Barnard [mailto:hugh.barnard at gmail.com]
> *Sent:* 30 October 2012 15:47
> *To:* The elegant MVC web framework
>
> *Subject:* Re: [Catalyst] Global 'helper' methods
>
>
>
> Hi
>
> On measurement in general, I'd recommend: Devel::NYTProf::Apache ; there's
> a write up here:
> http://www.slideshare.net/bobcatfish/profiling-with-develnytprof
>
> I'm dealing with a largish Catalyst/mod_perl thing at the moment and it's
> been tremendously helpful. One tip is that it is very picky about closing
> the files that it needs to compile the profiles, I write these into /tmp
> and then crunch them with the command line tools.
>
> Incidentally, I am 62 and therefore pretty old-skool and not mad for
> ORM-everywhere. It looks like I've been having performance problems becau=
se
> millions of rows get blessed into objects, not sure of this but it looks
> like a DBIC thing at the moment. Currently I've 'cursor'-ed them:
> my $cursor =3D $entries->cursor;
> while ( my @row_values =3D $cursor->next ) {
> and that seems to give some improvements in that area...
>
> Best regards Hugh
>
> On 30 October 2012 15:24, Lukas Thiemeier <spamcatcher at thiemeier.net>
> wrote:
>
> Hm... how to measure the overhead of a module?
>
> There is a XS version of the module which is used if you have a C
> compiler. I don't know the exact overhead, but I know that it is fast.
>
> I have no experience with the pure perl version of that module.
>
> If all you have to do with the dates is the simple string transformation
> you are right. As I said before: I recommend to use DT if you are
> working with dates a lot. Doing math on dates and times is annoying,
> because of leap years, epochs, timezones and so on. If you need this:
> Using DateTime is recommended. If not: Its not :)
>
> If you are ONLY using pure perl modules:
> You can include all required modules in your distribution. It should run
> on any perl installation, even in a shared host environment.
>
> App::FatPacker helps you doing this...
>
> But this doesn't work as soon as you use XS modules.
>
>
> On 10/30/2012 04:03 PM, Craig Chant wrote:
> > Thanks Lukas,
> >
> > I appreciate there is DateTime , though I have so much legacy code that
> uses my helper class re-writing everything will be a mammoth task.
> >
> > I hand rolled a lot when I first started out with Perl, didn't know much
> about CPAN or PPM, and couldn't load any modules that weren't part of the
> core install on the original 'shared' hosting I was using.
> >
> > Plus I always felt loading an entire module to re-arrange a tiny string
> seems a bit OTT?
> >
> > Dunno, what's the overhead of DateTime?
> >
> > Craig.
> >
> > -----Original Message-----
> > From: Lukas Thiemeier [mailto:spamcatcher at thiemeier.net]
> > Sent: 30 October 2012 14:52
> > To: catalyst at lists.scsys.co.uk
> > Subject: Re: [Catalyst] Global 'helper' methods
> >
> > You can also define your constants in "YourApp/Constants.pl", and "use"
> > YourApp::Constants wherever you need them.
> >
> > YourApp/Constants.pm:
> > use constant { FOO =3D> 1 };
> > 1;
> >
> > Controller.pm:
> >
> > use YourApp::Constants;
> >
> > # and in some method
> > ...
> > my $global_foo =3D FOO;
> >
> > There might be a better way, but this works...
> >
> > For handling dates, I recommend "DateTime", available on cpan:
> >
> > Another reason to use DBIC:
> > DBIx::Class::Inflatecolumn::DateTime automatically transforms dates
> stored in a database into a DateTime object, which can be used like this:
> >
> > my $uk_string =3D $datetime->dmy('/');
> > my $us_string =3D $datetime->ymd('-');
> >
> > But DateTime is not related to DBIC, DBIC just makes using it easy.
> >
> > Use it if you have to work with dates a lot. It has lots of methods for
> outputting dates, times or both in different formats, and it allows
> datetime-math...
> >
> >
> > On 10/30/2012 03:39 PM, Craig Chant wrote:
> >> Well I opted for putting my globals (methods and constants) in
> >> MyApp.pm
> >>
> >> It's working grand with $c->myMethod or $c->MY_CONSTANT
> >>
> >> I use to have them working as a bareword within my application , but
> $c->MY_CONSTANT is just as easy!
> >>
> >> Many thanks for all the input and help, it really is appreciated.
> >>
> >> -----Original Message-----
> >> From: Lukas Thiemeier [mailto:spamcatcher at thiemeier.net]
> >> Sent: 30 October 2012 13:56
> >> To: catalyst at lists.scsys.co.uk
> >> Subject: Re: [Catalyst] Global 'helper' methods
> >>
> >> Hi Craig,
> >>
> >> Writing helpers in your main App.pm and using roles is not either-or.
> >>
> >> Roles are one possibility to modify your classes in a reusable way.
> >>
> >> If your helpers are really global, which means that they are used by
> all, or almost all your controllers, I would put them into your main
> application class.
> >>
> >> If you have more than one application which make use of the same
> >> helpers: Put them into a role:
> >>
> >> YourHelperRole.pm:
> >>
> >> package YourHelperRole;
> >> use Moose::Role;
> >>
> >> has "some_attribute" =3D> ( ... ); # if you need attributes
> >>
> >> sub helpermethod1{
> >> my ($self, $other, $args) =3D @_;
> >> do_something();
> >> }
> >>
> >> sub helpermethod2{
> >> my ($self, $other, $args) =3D @_;
> >> do_something_different();
> >> }
> >>
> >> no Moose::Role; # or use namespace::autoclean or MooseX::MarkAsMethod
> >> 1;
> >>
> >> App.pm:
> >>
> >> use Catalyst qw( ... );
> >> extends "Catalyst";
> >> with qw/YourHelperRole/;
> >>
> >> ...
> >>
> >> In my opinion, extending your main App.pm with roles is only useful if
> you need the same helpers in different locations, too.
> >> If you only need them for that single application, avoid the overhead
> related to using roles.
> >>
> >> If you have helpers which are only needed by some controllers, create a
> role for your controllers. You can not only implement helpers in you role=
s,
> you can also create method-modifiers, which change the way your methods
> behave.
> >>
> >> Here is an example, which writes sth to the log, after the "delete"
> >> method was called:
> >>
> >> YourLogRole.pm:
> >>
> >> package YourLogRole;
> >>
> >> use Moose::Role;
> >> requires qw/delete/; #die if the consuming class has no "delete"
> >>
> >> after "delete" =3D> sub{
> >> my ($self, $c) =3D @_;
> >> $c->log->debug("DELETE called");
> >> };
> >>
> >> no Moose::Role;
> >> 1;
> >>
> >> Controller1.pm: (has the helpers, but no logging)
> >>
> >> package Controller1;
> >> use Moose;
> >> extends "Catalyst::Controller";
> >> with qw/
> >> YourHelperRole
> >> /;
> >>
> >> sub someaction :Local {
> >> my ($self, $c) =3D at _;
> >> $self->helpermethod1();
> >> }
> >>
> >> ...
> >>
> >> Controller2.pm: (has helpers AND logging)
> >>
> >> package Controller2;
> >> use Moose;
> >> extends "Catalyst::Controller";
> >> with qw/
> >> YourLogRole
> >> YourHelperRole
> >> /;
> >>
> >> sub delete :Local :Args(1) { ... }
> >>
> >> Controller3.pm (has logging, but no helpers)
> >>
> >> package Controller3;
> >> use Moose;
> >> extends "Catalyst::Controller";
> >> with qw/
> >> YourLogRole
> >> /;
> >>
> >> sub delete :Local :Args(1) { ... }
> >>
> >> Roles are very powerful tools. I use them a lot.
> >> Read the Moose docs for more information.
> >>
> >> If you don't want to learn Moose, roles and so on now, just remember:
> >>
> >> 1. write sth in a role
> >> 2. consume the role in a moose class, using "with"
> >> 3. your roles methods and attributes will be available in the
> >> consuming class
> >>
> >> Lukas
> >>
> >> On 10/30/2012 02:03 PM, Craig Chant wrote:
> >>> Hi,
> >>>
> >>>
> >>>
> >>> Please could you advise the best way of having a global 'helper'
> >>> class that has all commonly used methods in it accessible for any
> >>> part of the catalyst app.
> >>>
> >>>
> >>>
> >>> I found this thread
> >>> http://stackoverflow.com/questions/11941836/catalyst-global-subroutin
> >>> e
> >>> s
> >>>
> >>>
> >>>
> >>> With one indicating it's ok to put them in the main MyApp.pm and
> >>> another saying to use Moose & Roles.
> >>>
> >>>
> >>>
> >>> What is considered the correct way and could you provide an example
> >>> of how I create this helper class and bolt it to the Catalyst
> application.
> >>>
> >>>
> >>>
> >>> Many thanks,
> >>>
> >>>
> >>>
> >>> */Craig Chant/*
> >>>
> >>> I.T. Manager
> >>>
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> >>
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> Partnership by email. HomeLoan Partnership is a trading name of H L
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> Partnership Limited is authorised and regulated by the Financial Services
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>
>
> --
> http://www.hughbarnard.org
> http://www.twitter.com/hughbarnard
> http://www.big-wave-heuristics.com/
> This Email and any attachments contain confidential information and is
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> print or rely on any of the information contained, and all copies must be
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ny
> software viruses, any attachments to this e-mail may nevertheless contain
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> therefore carry out your own anti-virus checks before opening any
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> caused by computer viruses emanating from any attachment or other document
> supplied with this e-mail. HomeLoan Partnership reserves the right to
> monitor and archive all e-mail communications through its network. No
> representative or employee of HomeLoan Partnership has the authority to
> enter into any contract on behalf of HomeLoan Partnership by email.
> HomeLoan Partnership is a trading name of H L Partnership Limited,
> registered in England and Wales with Registration Number 5011722.
> Registered office: 26-34 Old Street, London, EC1V 9QQ. H L Partnership
> Limited is authorised and regulated by the Financial Services Authority.
>
> _______________________________________________
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>
-- =
http://www.hughbarnard.org
http://www.twitter.com/hughbarnard
http://www.big-wave-heuristics.com/
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