NAME
Exception::Tiny - too tiny exception interface
SYNOPSIS
simple example:
package MyException;
use parent 'Exception::Tiny';
package main;
# try
sub foo {
eval {
MyException->throw( 'oops!' ); # same MyException->throw( message => 'oops!' );
};
}
# catch
if (my $e = $@) {
if (MyException->caught($e)) {
say $e->message; # show 'oops!'
say $e->package; # show 'main'
say $e->file; # show 'foo.pl'
say $e->line; # show '9'
say $e->subroutine; # show 'main:foo'
say $e->dump; # dump self
say $e; # show 'oops! at foo.pl line 9.'
$e->rethrow; # rethrow MyException exception.
}
}can you accessor for exception class:
package MyExceptionBase;
use parent 'Exception::Tiny';
use Class::Accessor::Lite (
ro => [qw/ status_code /],
);
package MyException::Validator;
use parent -norequire, 'MyExceptionBase';
use Class::Accessor::Lite (
ro => [qw/ dfv /],
);
package main;
# try
eval {
MyException::Validator->throw(
message => 'oops',
status_code => '500',
dfv => {
missing => 'name field is missing.',
},
);
};
# catch
if (my $e = $@) {
if (MyException->caught($e)) {
say $e->message; # show 'oops';
say $e->status_code; # show '500';
say $e->dfv->{missing}; # show 'name field is missing.'
say $e; # show 'oops at bar.pl line 17.'
}
}can you catche nested class:
package BaseException;
use parent 'Exception::Tiny';
package MyException::Validator;
use parent -norequire, 'BaseException';
package main;
eval { MyException::Validator->throw }
my $e = $@;
say $e if BaseException->caught($e); # show 'MyException::Validator at bar.pl line 9.'DESCRIPTION
Exception::Tiny is too simple exception interface. This is the implementation of the minimum required in order to implement exception handling. So anyone can understand the implementation It.
CLASS METHODS
throw( ... )
throw the exception.
caught($e)
It returns an exception object if the argument is of the current class, or a subclass of that class. it simply returns $e.
INSTANCE METHODS
rethrow
re-throw the exception object.
message
It return the exception message. default is exception class name.
package
It return the package name that exception has occurred.
file
It return the file name that exception has occurred.
line
It return the line number in file that exception has occurred.
subroutine
It return the subroutine name that exception has occurred.
as_string
It returned in the format the exception contents of a simple string. You can Implementation overridden.
dump
It to dump the contents of the instance. You can Implementation overridden.
HACKING IDEA
If you want Exception::Class::Base style object, you can write like code of the under.
package HackException;
use parent 'Exception::Tiny';
use Class::Accessor::Lite (
ro => [qw/ time pid uid euid gid egid /],
);
sub new {
my($class, %args) = @_;
%args = (
%args,
time => CORE::time,
pid => $$,
uid => $<,
euid => $>,
gid => $(,
egid => $),
);
$class->SUPER::new(%args);
}
eval {
HackException->throw;
};
my $e = $@;
say $e->time;
say $e->pid;
say $e->uid;
say $e->euid;
say $e->gid;
say $e->egid;AUTHOR
Kazuhiro Osawa <yappo {@} shibuya {dot} pl>
SEE ALSO
LICENSE
Copyright (C) Kazuhiro Osawa
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.