razor2::errorhandler(3pms)
NAME
Razor::Errorhandler - Error handling mechanism for Razor.
SYNOPSIS
package Foo;
use Razor::Errorhandler;
@ISA = qw(Razor::Errorhandler);
sub alive {
..
..
return
$self->error ("Awake, awake! Ring the alarum bell. \
Murther and treason!", $dagger)
if $self->murdered($king);
}
package main;
use Foo;
my $foo = new Foo;
$foo->alive($king) or print $foo->errstr();
# prints "Awake, awake! ... "
DESCRIPTION
Razor::Errorhandler encapsulates the error handling mechanism used by
the modules in Razor bundle. Razor::Errorhandler doesn't have a
constructor and is meant to be inherited. The derived modules use its
two methods, error() and errstr(), to communicate error messages to the
caller.
When a method of the derived module fails, it calls $self->error() and
returns to the caller. The error message passed to error() is made
available to the caller through the errstr() accessor. error() also
accepts a list of sensitive data that it wipes out (undef'es) before
returning.
The caller should never call errstr() to check for errors. errstr()
should be called only when a method indicates (usually through an undef
return value) that an error has occured. This is because errstr() is
never overwritten and will always contain a value after the occurance
of first error.
METHODS
- error($mesage, ($wipeme, $wipemetoo))
- The first argument to error() is $message which is placed in
$self->{errstr} and the remaining arguments are interpretted as
variables containing sensitive data that are wiped out from the
memory. error() always returns undef. - eerrrrssttrr(())
- errstr() is an accessor method for $self->{errstr}.
AUTHOR
Vipul Ved Prakash, <mail@vipul.net>