# This program is copyright 2011 Percona Ireland Ltd.
# Feedback and improvements are welcome.
#
# THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
# MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, version 2; OR the Perl Artistic License.  On UNIX and similar
# systems, you can issue `man perlgpl' or `man perlartistic' to read these
# licenses.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 59 Temple
# Place, Suite 330, Boston, MA  02111-1307  USA.
# ###########################################################################
# DiskstatsGroupByAll package
# ###########################################################################
{
# Package: DiskstatsGroupByAll
# 

package DiskstatsGroupByAll;

use warnings;
use strict;
use English qw(-no_match_vars);
use constant PTDEBUG => $ENV{PTDEBUG} || 0;

use base qw( Diskstats );

sub group_by {
   my ($self, %args) = @_;

   $self->clear_state() unless $self->interactive();

   $self->parse_from(
      filehandle      => $args{filehandle},
      filename        => $args{filename},
      data            => $args{data},
      sample_callback => sub {
            $self->print_deltas(
               header_callback => $args{header_callback} || sub {
                  my ($self, @args) = @_;
                  $self->print_header(@args);
                  $self->set_force_header(undef);
               },
               rows_callback   => $args{rows_callback},
            );
         },
   );

   return;
}

# The next methods are all overrides!

sub delta_against {
   my ($self, $dev) = @_;
   return $self->prev_stats_for($dev);
}

sub ts_line_for_timestamp {
   my ($self) = @_;
   return $self->prev_ts_line();
}

sub delta_against_ts {
   my ($self) = @_;
   return $self->prev_ts();
}

sub compute_line_ts {
   my ($self, %args) = @_;
   if ( $self->interactive() ) {
      # In interactive mode, we always compare against the previous sample,
      # but the default is to compare against the first.
      # This is generally a non-issue, because it can only happen
      # when there are more than two samples left to parse in the file,
      # which can only happen when someone sets a redisplay or sampling
      # interval (or both) too high.
      $args{first_ts} = $self->prev_ts();
   }
   return $self->SUPER::compute_line_ts(%args);
}

1;
}
# ###########################################################################
# End DiskstatsGroupByAll package
# ###########################################################################