NAME

       Mail::Mbox::MessageParser::Cache - A cache-based mbox folder reader

SYNOPSIS

         #!/usr/bin/perl

         use Mail::Mbox::MessageParser;

         my $filename = 'mail/saved-mail';
         my $filehandle = new FileHandle($filename);

         # Set up cache
         Mail::Mbox::MessageParser::SETUP_CACHE(
           { 'file_name' => '/tmp/cache' } );

         my $folder_reader =
           new Mail::Mbox::MessageParser( {
             'file_name' => $filename,
             'file_handle' => $filehandle,
             'enable_cache' => 1,
           } );

         die $folder_reader unless ref $folder_reader;

         warn "No cached information"
           if $Mail::Mbox::MessageParser::Cache::UPDATING_CACHE;

         # Any newlines or such before the start of the first email
         my $prologue = $folder_reader->prologue;
         print $prologue;

         # This is the main loop. It's executed once for each email
         while(!$folder_reader->end_of_file());
         {
           my $email = $folder_reader->read_next_email();
           print $email;
         }

DESCRIPTION

       This module implements a cached-based mbox folder reader. It can only be used when cache
       information already exists. Users must not instantiate this class directly--use
       Mail::Mbox::MessageParser instead. The base MessageParser module will automatically manage
       the use of cache and non-cache implementations.

   METHODS AND FUNCTIONS
       The following methods and functions are specific to the Mail::Mbox::MessageParser::Cache
       package. For additional inherited ones, see the Mail::Mbox::MessageParser documentation.

       $ref = new( { 'file_name' => <mailbox file name>, 'file_handle' => <mailbox file handle>,
       });
               <file_name> - The full filename of the mailbox
               <file_handle> - An opened file handle for the mailbox

           The constructor for the class takes two parameters. file_name is the filename of the
           mailbox. This will be used as the cache key, so it's important that it fully defines
           the path to the mailbox. The file_handle argument is the opened file handle to the
           mailbox. Both arguments are required.

           Returns a reference to a Mail::Mbox::MessageParser object, or a string describing the
           error.

       reset()
       read_next_email()
           These methods are overridden in this subclass of Mail::Mbox::MessageParser.

BUGS

       No known bugs.

       Contact david@coppit.org for bug reports and suggestions.

AUTHOR

       David Coppit <david@coppit.org>.

LICENSE

       This code is distributed under the GNU General Public License (GPL) Version 2.  See the
       file LICENSE in the distribution for details.

HISTORY

       This code was originally part of the grepmail distribution. See http://grepmail.sf.net/
       for previous versions of grepmail which included early versions of this code.

SEE ALSO

       Mail::Mbox::MessageParser