04-10-2016
OK. So just to be sure I understand:
- You have one employee with EmpID 3 who is currently using two names (CCC and DDD), is currently working in two departments (30 and 40), drawing separate salaries from both departments, and was hired for both jobs at midnight on the morning on January 8, 2010 when this person was 21 years old?
- And, you have two employees that you are (or, maybe, were) paying relatively high salaries and you don't know when they were born, when they were hired, nor whether or not they are still showing up for work?
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LEARN ABOUT MOJAVE
moose::cookbook::roles::applicationtoinstance5.18
Moose::Cookbook::Roles::ApplicationToInstance(3) User Contributed Perl Documentation Moose::Cookbook::Roles::ApplicationToInstance(3)
NAME
Moose::Cookbook::Roles::ApplicationToInstance - Applying a role to an object instance
VERSION
version 2.1202
SYNOPSIS
package MyApp::Role::Job::Manager;
use List::Util qw( first );
use Moose::Role;
has 'employees' => (
is => 'rw',
isa => 'ArrayRef[Employee]',
);
sub assign_work {
my $self = shift;
my $work = shift;
my $employee = first { !$_->has_work } @{ $self->employees };
die 'All my employees have work to do!' unless $employee;
$employee->work($work);
}
package main;
my $lisa = Employee->new( name => 'Lisa' );
MyApp::Role::Job::Manager->meta->apply($lisa);
my $homer = Employee->new( name => 'Homer' );
my $bart = Employee->new( name => 'Bart' );
my $marge = Employee->new( name => 'Marge' );
$lisa->employees( [ $homer, $bart, $marge ] );
$lisa->assign_work('mow the lawn');
DESCRIPTION
In this recipe, we show how a role can be applied to an object. In this specific case, we are giving an employee managerial
responsibilities.
Applying a role to an object is simple. The Moose::Meta::Role object provides an "apply" method. This method will do the right thing when
given an object instance.
MyApp::Role::Job::Manager->meta->apply($lisa);
We could also use the "apply_all_roles" function from Moose::Util.
apply_all_roles( $person, MyApp::Role::Job::Manager->meta );
The main advantage of using "apply_all_roles" is that it can be used to apply more than one role at a time.
We could also pass parameters to the role we're applying:
MyApp::Role::Job::Manager->meta->apply(
$lisa,
-alias => { assign_work => 'get_off_your_lazy_behind' },
);
We saw examples of how method exclusion and alias working in Moose::Cookbook::Roles::Restartable_AdvancedComposition.
CONCLUSION
Applying a role to an object instance is a useful tool for adding behavior to existing objects. In our example, it is effective used to
model a promotion.
It can also be useful as a sort of controlled monkey-patching for existing code, particularly non-Moose code. For example, you could create
a debugging role and apply it to an object at runtime.
AUTHORS
o Stevan Little <stevan.little@iinteractive.com>
o Dave Rolsky <autarch@urth.org>
o Jesse Luehrs <doy@tozt.net>
o Shawn M Moore <code@sartak.org>
o XXXX XXX'XX (Yuval Kogman) <nothingmuch@woobling.org>
o Karen Etheridge <ether@cpan.org>
o Florian Ragwitz <rafl@debian.org>
o Hans Dieter Pearcey <hdp@weftsoar.net>
o Chris Prather <chris@prather.org>
o Matt S Trout <mst@shadowcat.co.uk>
COPYRIGHT AND LICENSE
This software is copyright (c) 2006 by Infinity Interactive, Inc..
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
perl v5.18.2 2014-01-19 Moose::Cookbook::Roles::ApplicationToInstance(3)