NAME

IO::Handle::Record - IO::Handle extension to pass perl data structures

SYNOPSIS

 use IO::Socket::UNIX;
 use IO::Handle::Record;

 ($p, $c)=IO::Socket::UNIX->socketpair( AF_UNIX,
                                        SOCK_STREAM,
                                        PF_UNSPEC );
 while( !defined( $pid=fork ) ) {sleep 1}

 if( $pid ) {
   close $c; undef $c;
 
   $p->record_opts={send_CODE=>1};
   $p->write_record( {a=>'b', c=>'d'},
                     sub { $_[0]+$_[1] },
                     [qw/this is a test/] );
 } else {
   close $p; undef $p;
 
   $c->record_opts={receive_CODE=>sub {eval $_[0]}};
   ($hashref, $coderef, $arrayref)=$c->read_record;
 }

DESCRIPTION

IO::Handle::Record extends the IO::Handle class. Since many classes derive from IO::Handle these extensions can be used with IO::File, IO::Socket, IO::Pipe, etc.

The methods provided read and write lists of perl data structures. They can pass anything that can be serialized with Storable even subroutines between processes.

The following methods are added:

record_opts

This lvalue method expects a hash reference with options as parameter. The send_CODE and receive_CODE options are defined. They correspond to localized versions of $Storable::Deparse and $Storable::Eval respectively. See the Storable manpage for further information.

Example:

 $handle->record_opts={send_CODE=>1, receive_CODE=>1};

write_record

writes a list of perl data structures.

Example:

 $handle->write_record( [1,2],
                        sub {$_[0]+$_[1]},
                        { list=>[1,2,3],
                          hash=>{a=>'b'},
                          code=>sub {print "test\n";} } );

read_record

reads one record of perl data structures. Returns the list.

Example:

 ($array, $sub, $hash)=$handle->read_record;

EXPORT

None.

SEE ALSO

IO::Handle

AUTHOR

Torsten Foertsch, <torsten.foertsch@gmx.net<gt>

COPYRIGHT AND LICENSE

Copyright (C) 2005 by Torsten Foertsch

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