Ordered(3) User Contributed Perl Documentation Ordered(3)NAMEModule::Pluggable::Ordered - Call module plugins in a specified order
SYNOPSIS
package Foo;
use Module::Pluggable::Ordered;
Foo->call_plugins("some_event", @stuff);
for my $plugin (Foo->plugins()){
$plugin->method();
}
Meanwhile, in a nearby module...
package Foo::Plugin::One;
sub some_event_order { 99 } # I get called last of all
sub some_event { my ($self, @stuff) = @_; warn "Hello!" }
sub _order { 99 } # I get listed by plugins_ordered() last
And in another:
package Foo::Plugin::Two;
sub some_event_order { 13 } # I get called relatively early
sub some_event { ... }
sub _order { 10 } # I get listed by plugins_ordered() early
DESCRIPTION
This module behaves exactly the same as "Module::Pluggable", supporting
all of its options, but also mixes in the "call_plugins" and
"plugins_ordered" methods to your class. "call_plugins" acts a little
like "Class::Trigger"; it takes the name of a method, and some
parameters. Let's say we call it like so:
__PACKAGE__->call_plugins("my_method", @something);
"call_plugins" looks at the plugin modules found using
"Module::Pluggable" for ones which provide "my_method_order". It sorts
the modules numerically based on the result of this method, and then
calls "$_->my_method(@something)" on them in order. This produces an
effect a little like the System V init process, where files can specify
where in the init sequence they want to be called.
"plugins_ordered" extends the "plugins" method created by
"Module::Pluggable" to list the plugins in defined order. It looks for
a "_order" method in the modules found using "Module::Pluggable", and
returns the modules sorted numerically in that order. For example:
my @plugins = __PACKAGE__->plugins();
The resulting array of plugins will be sorted. If no "_order"
subroutine is defined for a module, an arbitrary default value of 50 is
used.
OPTIONS
The "package" option can be used to put the pluggability into another
package, to be used for modules building on the functionality of this
one.
It also provides the "only" and "except" options.
# will only return the Foo::Plugin::Quux plugin
use Module::Pluggable::Ordered only => [ "Foo::Plugin::Quux" ];
# will not return the Foo::Plugin::Quux plugin
use Module::Pluggable::Ordered except => [ "Foo::Plugin::Quux" ];
SEE ALSO
Module::Pluggable, Class::Trigger
AUTHOR
Simon Cozens, <simon@cpan.org> (author emeritus)
Christopher Nehren, <apeiron@cpan.org> (current maintainer)
Please report bugs via the CPAN RT tracker at http://rt.cpan.org.
COPYRIGHT AND LICENSE
Copyright 2004 by Simon Cozens
Copyright 2004 by Christopher Nehren (current copyright holder)
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
ACKNOWLEDGEMENTS
Thank you to Simon Cozens for originally writing this module.
Thanks to Lars Thegler for indirectly alerting me to the fact that my
POD was horribly broken, for providing patches to make this module work
with Perl versions < 5.6, for maintaining the port up to version 1.3,
and for allowing me to take maintainership for versions 1.3 onwards.
perl v5.14.0 2006-07-02 Ordered(3)
