Name

Unexpected - Exception class composed from traits

Synopsis

   package YourApp::Exception;

   use Moo;

   extends 'Unexpected';
   with    'Unexpected::TraitFor::ErrorLeader';

   __PACKAGE__->ignore_class( 'YourApp::IgnoreMe' );

   has '+class' => default => __PACKAGE__;

   package YourApp;

   use YourApp::Exception;
   use Try::Tiny;

   sub some_method {
      my $self = shift;

      try   { this_will_fail }
      catch { YourApp::Exception->throw $_ };
   }

   # OR

   sub some_method {
      my $self = shift;

      eval { this_will_fail };
      YourApp::Exception->throw_on_error;
   }

   # THEN
   try   { $self->some_method() }
   catch { warn $_->message };

Version

This documents version v0.23.$Rev: 2 $ of Unexpected

Description

An exception class that supports error messages with placeholders, a throw method with automatic re-throw upon detection of self, conditional throw if an exception was caught and a simplified stack trace in addition to the error message with full stack trace

Configuration and Environment

Applies exception roles to the exception base class Unexpected. See "Dependencies" for the list of roles that are applied

Error objects are overloaded to stringify to the full error message plus a leader if the optional ErrorLeader role has been applied

Subroutines/Methods

BUILDARGS

Customizes the constructor. Accepts either a coderef, an object ref, a hashref, a scalar, or a list of key / value pairs

BUILD

Does nothing placeholder that allows the applied roles to modify it

is_one_of_us

   $bool = $class->is_one_of_us( $string_or_exception_object_ref );

Class method which detects instances of this exception class

Diagnostics

String overload is performed in this class as opposed to the stringify error role since overloading is not supported in Moo::Role

Dependencies

namespace::sweep

overload

Moo

Unexpected::TraitFor::Exception::Classes

Unexpected::TraitFor::StringifyingError

Unexpected::TraitFor::Throwing

Unexpected::TraitFor::TracingStacks

Incompatibilities

There are no known incompatibilities in this module

Bugs and Limitations

Throwable did not let me use the stack trace filter directly, it's wrapped inside an attribute constructor. There was nothing else in Throwable that would not have been overridden

There are no known bugs in this module. Please report problems to http://rt.cpan.org/NoAuth/Bugs.html?Dist=Unexpected. Patches are welcome

Acknowledgements

Larry Wall - For the Perl programming language

Throwable::Error - Lifted the stack frame filter from here

John Sargent - Came up with the package name

Author

Peter Flanigan, <pjfl@cpan.org>

License and Copyright

Copyright (c) 2014 Peter Flanigan. All rights reserved

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic

This program is distributed in the hope that it will be useful, but WITHOUT WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE

cpanm Unexpected

perl -MCPAN -e shell
install Unexpected