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.\" ========================================================================
.\"
.IX Title "Class::C3::Adopt::NEXT 3pm"
.TH Class::C3::Adopt::NEXT 3pm "2009-06-08" "perl v5.10.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Class::C3::Adopt::NEXT \- make NEXT suck less
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 4
\&    package MyApp::Plugin::FooBar;
\&    #use NEXT;
\&    use Class::C3::Adopt::NEXT;
\&    # or \*(Aquse Class::C3::Adopt::NEXT \-no_warn;\*(Aq to suppress warnings
\&
\&    # Or use warnings::register
\&    # no warnings \*(AqClass::C3::Adopt::NEXT\*(Aq;
\&
\&    # Or suppress warnings in a set of modules from one place
\&    # no Class::C3::Adopt::NEXT qw/ Module1 Module2 Module3 /;
\&    # Or suppress using a regex
\&    # no Class::C3::Adopt::NEXT qr/^Module\ed$/;
\&
\&    sub a_method {
\&        my ($self) = @_;
\&        # Do some stuff
\&
\&        # Re\-dispatch method
\&        # Note that this will generate a warning the _first_ time the package
\&        # uses NEXT unless you un comment the \*(Aqno warnings\*(Aq line above.
\&        $self\->NEXT::method();
\&    }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\s-1NEXT\s0 was a good solution a few years ago, but isn't any more.  It's slow,
and the order in which it re-dispatches methods appears random at times. It
also encourages bad programming practices, as you end up with code to
re-dispatch methods when all you really wanted to do was run some code before
or after a method fired.
.PP
However, if you have a large application, then weaning yourself off \f(CW\*(C`NEXT\*(C'\fR
isn't easy.
.PP
This module is intended as a drop-in replacement for \s-1NEXT\s0, supporting the same
interface, but using Class::C3 to do the hard work. You can then write new
code without \f(CW\*(C`NEXT\*(C'\fR, and migrate individual source files to use \f(CW\*(C`Class::C3\*(C'\fR
or method modifiers as appropriate, at whatever pace you're comfortable with.
.SH "WARNINGS"
.IX Header "WARNINGS"
This module will warn once for each package using \s-1NEXT\s0. It uses
warnings::register, and so can be disabled like by adding \f(CW\*(C`no warnings
\&\*(AqClass::C3::Adopt::NEXT\*(Aq;\*(C'\fR to each package which generates a warning, or adding
\&\f(CW\*(C`use Class::C3::Adopt::NEXT \-no_warn;\*(C'\fR, or disable multiple modules at once by
saying:
.PP
.Vb 1
\&    no Class::C3::Adopt::NEXT qw/ Module1 Module2 Module3 /;
.Ve
.PP
somewhere before the warnings are first triggered. You can also setup entire
name spaces of modules which will not warn using a regex, e.g.
.PP
.Vb 1
\&    no Class::C3::Adopt::NEXT qr/^Module\ed$/;
.Ve
.SH "MIGRATING"
.IX Header "MIGRATING"
.SS "Current code using \s-1NEXT\s0"
.IX Subsection "Current code using NEXT"
You add \f(CW\*(C`use MRO::Compat\*(C'\fR to the top of a package as you start converting it,
and gradually replace your calls to \f(CW\*(C`NEXT::method()\*(C'\fR with
\&\f(CW\*(C`maybe::next::method()\*(C'\fR, and calls to \f(CW\*(C`NEXT::ACTUAL::method()\*(C'\fR with
\&\f(CW\*(C`next::method()\*(C'\fR.
.PP
Example:
.PP
.Vb 2
\&    sub yourmethod {
\&        my $self = shift;
\&
\&        # $self\->NEXT::yourmethod(@_); becomes
\&        $self\->maybe::next::method();
\&    }
\&
\&    sub othermethod {
\&        my $self = shift;
\&
\&        # $self\->NEXT::ACTUAL::yourmethodname(); becomes
\&        $self\->next::method();
\&    }
.Ve
.PP
On systems with Class::C3::XS present, this will automatically be used to
speed up method re-dispatch. If you are running perl version 5.9.5 or greater
then the C3 method resolution algorithm is included in perl. Correct use of
MRO::Compat as shown above allows your code to be seamlessly forward and
backwards compatible, taking advantage of native versions if available, but
falling back to using pure perl \f(CW\*(C`Class::C3\*(C'\fR.
.SS "Writing new code"
.IX Subsection "Writing new code"
Use Moose and make all of your plugins Moose::Roles, then use
method modifiers to wrap methods.
.PP
Example:
.PP
.Vb 2
\&    package MyApp::Role::FooBar;
\&    use Moose::Role;
\&
\&    before \*(Aqa_method\*(Aq => sub {
\&        my ($self) = @_;
\&        # Do some stuff
\&    };
\&
\&    around \*(Aqa_method\*(Aq => sub {
\&        my $orig = shift;
\&        my $self = shift;
\&        # Do some stuff before
\&        my $ret = $self\->$orig(@_); # Run wrapped method (or not!)
\&        # Do some stuff after
\&        return $ret;
\&    };
\&
\&    package MyApp;
\&    use Moose;
\&
\&    with \*(AqMyApp::Role::FooBar\*(Aq;
.Ve
.SH "CAVEATS"
.IX Header "CAVEATS"
There are some inheritance hierarchies that it is possible to create which
cannot be resolved to a simple C3 hierarchy. In that case, this module will
fall back to using \f(CW\*(C`NEXT\*(C'\fR. In this case a warning will be emitted.
.PP
Because calculating the \s-1MRO\s0 of every class every time \f(CW\*(C`\->NEXT::foo\*(C'\fR is
used from within it is too expensive, runtime manipulations of \f(CW@ISA\fR are
prohibited.
.SH "FUNCTIONS"
.IX Header "FUNCTIONS"
This module replaces \f(CW\*(C`NEXT::AUTOLOAD\*(C'\fR with it's own version. If warnings are
enabled then a warning will be emitted on the first use of \f(CW\*(C`NEXT\*(C'\fR by each
package.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
MRO::Compat and Class::C3 for method re-dispatch and Moose for method
modifiers and roles.
.PP
\&\s-1NEXT\s0 for documentation on the functionality you'll be removing.
.SH "AUTHORS"
.IX Header "AUTHORS"
Florian Ragwitz \f(CW\*(C`rafl@debian.org\*(C'\fR
.PP
Tomas Doran \f(CW\*(C`bobtfish@bobtfish.net\*(C'\fR
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright (c) 2008, 2009  Florian Ragwitz
.PP
You may distribute this code under the same terms as Perl itself.