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package DBD::Gofer::Transport::null;
# $Id: null.pm 10087 2007-10-16 12:42:37Z timbo $
#
# Copyright (c) 2007, Tim Bunce, Ireland
#
# You may distribute under the terms of either the GNU General Public
# License or the Artistic License, as specified in the Perl README file.
use strict;
use warnings;
use base qw(DBD::Gofer::Transport::Base);
use DBI::Gofer::Execute;
our $VERSION = sprintf("0.%06d", q$Revision: 10087 $ =~ /(\d+)/o);
__PACKAGE__->mk_accessors(qw(
pending_response
transmit_count
));
my $executor = DBI::Gofer::Execute->new();
sub transmit_request_by_transport {
my ($self, $request) = @_;
$self->transmit_count( ($self->transmit_count()||0) + 1 ); # just for tests
my $frozen_request = $self->freeze_request($request);
# ...
# the request is magically transported over to ... ourselves
# ...
my $response = $executor->execute_request( $self->thaw_request($frozen_request, undef, 1) );
# put response 'on the shelf' ready for receive_response()
$self->pending_response( $response );
return undef;
}
sub receive_response_by_transport {
my $self = shift;
my $response = $self->pending_response;
my $frozen_response = $self->freeze_response($response, undef, 1);
# ...
# the response is magically transported back to ... ourselves
# ...
return $self->thaw_response($frozen_response);
}
1;
__END__
=head1 NAME
DBD::Gofer::Transport::null - DBD::Gofer client transport for testing
=head1 SYNOPSIS
my $original_dsn = "..."
DBI->connect("dbi:Gofer:transport=null;dsn=$original_dsn",...)
or, enable by setting the DBI_AUTOPROXY environment variable:
export DBI_AUTOPROXY="dbi:Gofer:transport=null"
=head1 DESCRIPTION
Connect via DBD::Gofer but execute the requests within the same process.
This is a quick and simple way to test applications for compatibility with the
(few) restrictions that DBD::Gofer imposes.
It also provides a simple, portable way for the DBI test suite to be used to
test DBD::Gofer on all platforms with no setup.
Also, by measuring the difference in performance between normal connections and
connections via C<dbi:Gofer:transport=null> the basic cost of using DBD::Gofer
can be measured. Furthermore, the additional cost of more advanced transports can be
isolated by comparing their performance with the null transport.
The C<t/85gofer.t> script in the DBI distribution includes a comparative benchmark.
=head1 AUTHOR
Tim Bunce, L<http://www.tim.bunce.name>
=head1 LICENCE AND COPYRIGHT
Copyright (c) 2007, Tim Bunce, Ireland. All rights reserved.
This module is free software; you can redistribute it and/or
modify it under the same terms as Perl itself. See L<perlartistic>.
=head1 SEE ALSO
L<DBD::Gofer::Transport::Base>
L<DBD::Gofer>
=cut
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