07-30-2010
Nope...
./explode: line 70: 14267 Killed runmqtrm -m $ourManager -q $ourMQSYS.EVTINITQ
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LEARN ABOUT DEBIAN
moose::cookbook::roles::restartable_advancedcomposition
Moose::Cookbook::Roles::Restartable_AdvancedComposition(User Contributed Perl DocumentMoose::Cookbook::Roles::Restartable_AdvancedComposition(3pm)
NAME
Moose::Cookbook::Roles::Restartable_AdvancedComposition - Advanced Role Composition - method exclusion and aliasing
VERSION
version 2.0603
SYNOPSIS
package Restartable;
use Moose::Role;
has 'is_paused' => (
is => 'rw',
isa => 'Bool',
default => 0,
);
requires 'save_state', 'load_state';
sub stop { 1 }
sub start { 1 }
package Restartable::ButUnreliable;
use Moose::Role;
with 'Restartable' => {
-alias => {
stop => '_stop',
start => '_start'
},
-excludes => [ 'stop', 'start' ],
};
sub stop {
my $self = shift;
$self->explode() if rand(1) > .5;
$self->_stop();
}
sub start {
my $self = shift;
$self->explode() if rand(1) > .5;
$self->_start();
}
package Restartable::ButBroken;
use Moose::Role;
with 'Restartable' => { -excludes => [ 'stop', 'start' ] };
sub stop {
my $self = shift;
$self->explode();
}
sub start {
my $self = shift;
$self->explode();
}
DESCRIPTION
In this example, we demonstrate how to exercise fine-grained control over what methods we consume from a role. We have a "Restartable" role
which provides an "is_paused" attribute, and two methods, "stop" and "start".
Then we have two more roles which implement the same interface, each putting their own spin on the "stop" and "start" methods.
In the "Restartable::ButUnreliable" role, we want to provide a new implementation of "stop" and "start", but still have access to the
original implementation. To do this, we alias the methods from "Restartable" to private methods, and provide wrappers around the originals(1).
Note that aliasing simply adds a name, so we also need to exclude the methods with their original names.
with 'Restartable' => {
-alias => {
stop => '_stop',
start => '_start'
},
-excludes => [ 'stop', 'start' ],
};
In the "Restartable::ButBroken" role, we want to provide an entirely new behavior for "stop" and "start". We exclude them entirely when
composing the "Restartable" role into "Restartable::ButBroken".
It's worth noting that the "-excludes" parameter also accepts a single string as an argument if you just want to exclude one method.
with 'Restartable' => { -excludes => [ 'stop', 'start' ] };
CONCLUSION
Exclusion and renaming are a power tool that can be handy, especially when building roles out of other roles. In this example, all of our
roles implement the "Restartable" role. Each role provides same API, but each has a different implementation under the hood.
You can also use the method aliasing and excluding features when composing a role into a class.
FOOTNOTES(1) The mention of wrapper should tell you that we could do the same thing using method modifiers, but for the sake of this example, we
don't.
AUTHOR
Moose is maintained by the Moose Cabal, along with the help of many contributors. See "CABAL" in Moose and "CONTRIBUTORS" in Moose for
details.
COPYRIGHT AND LICENSE
This software is copyright (c) 2012 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 v5.14.2 2012-06-28 Moose::Cookbook::Roles::Restartable_AdvancedComposition(3pm)