sungo

NAME

POE::Exceptions - POE class for handling exceptions

SYNOPSIS

    use POE::Exceptions;

    POE::Session::Exception->create(
        inline_states => {
            _start => sub { print 'START';
                            $_[KERNEL]->sig('DIE','death_handled');
                          },
            death_handled => sub { print 'EXCEPTION CAUGHT' 
                                   $_[KERNEL]->sig_handled();
                                 },
            _stop => { print 'END' }
        }
    );

    $poe_kernel->run();

AUTHOR

Matt Cashner (eek+cpan@eekeek.org)

DISCUSSION

POE::Exceptions extends POE to catch exceptions neatly. A new signal, DIE, is introduced. This signal will be fired every time an exception occurs. (For those of you new to the term exception, an exception is whenever the code decides to bail out by die'ing.) If the signal handler returns 1 (as in the example above), POE will assume that the handler dealt with the signal appropriately. If the signal handler returns 0, POE will assume that the handler does not want to deal with the signal and POE will propgate the exception as if the handler never existed.

Caveat: POE::Exceptions will die on its own in the case of a double exception fault. If the DIE signal handler itself throws an exception, POE::Exceptions will shut the program down and bail out.

LICENSE AND COPYRIGHT

Copyright (c) 2002, Matt Cashner

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.