NAME¶
Aspect::Advice - Change how Perl code is run at a pointcut
SYNOPSIS¶
# Trace calls to all functions in all MyAccount classes
use Aspect;
before {
print 'Called: '. $_->sub_name;
} call qw/^MyAccount::/;
# Repeat using the pure object-oriented interface
use Aspect::Advice::Before ();
use Aspect::Pointcut::Call ();
my $advice = Aspect::Advice::Before->new(
pointcut => Aspect::Pointcut::Call->new( qr/^MyAccount::/ ),
code => sub {
print 'called: '. $_->sub_name;
},
);
DESCRIPTION¶
An "advice" in AOP lingo is composed of a condition (known as a
Aspect::Pointcut) and some code that will run when that pointcut is true.
This code is run before, after, or around the target pointcut depending on the
particular advice type declaration used.
You do not normally create advice using the constructor. By "use()"ing
Aspect, you get five advice declaration subroutines imported.
"before" is used to indicate code that should run prior to the
function being called. See Aspect::Advice::Before for more information.
"after" is used to indicate code that should run following the
function being called, regardless of whether it returns normally or throws an
exception. See Aspect::Advice::After for more information.
"around" is used to take deeper control of the call and gives you your
own lexical scope between the caller and callee, with a specific
"proceed" call required in your code to execute the target function.
See Aspect::Advice::Around for more information.
When the advice code is called, it is provided with an Advice::Point object
which describes the context of the call to the target function, and allows you
to change it.
This parameter is provided both via the topic variable $_ (since version 0.90)
and additionally as the first parameter to the advice code (which may be
deprecated at some point in the future).
If you are creating "advice" objects directly via the OO interface,
you should never use this class directly but instead use the class of the
particular type of advice you want to create.
AUTHORS¶
Adam Kennedy <adamk@cpan.org>
Marcel Gruenauer <marcel@cpan.org>
Ran Eilam <eilara@cpan.org>
COPYRIGHT¶
Copyright 2001 by Marcel Gruenauer
Some parts copyright 2009 - 2013 Adam Kennedy.
This library is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.