converted replicant to a role so that we can apply it after ensure_connected properly...

[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / Storage / DBI / Replicated / Replicant.pm

package DBIx::Class::Storage::DBI::Replicated::Replicant;

use Moose::Role;

=head1 NAME

DBIx::Class::Storage::DBI::Replicated::Replicant; A replicated DBI Storage Role

=head1 SYNOPSIS

This class is used internally by L<DBIx::Class::Storage::DBI::Replicated>.
    
=head1 DESCRIPTION

Replicants are DBI Storages that follow a master DBI Storage.  Typically this
is accomplished via an external replication system.  Please see the documents
for L<DBIx::Class::Storage::DBI::Replicated> for more details.

This class exists to define methods of a DBI Storage that only make sense when
it's a classic 'slave' in a pool of slave databases which replicate from a
given master database.

=head1 ATTRIBUTES

This class defines the following attributes.

=head2 active

This is a boolean which allows you to programmatically activate or deactivate a
replicant from the pool.  This way to you do stuff like disallow a replicant
when it get's too far behind the master, if it stops replicating, etc.

This attribute DOES NOT reflect a replicant's internal status, i.e. if it is
properly replicating from a master and has not fallen too many seconds behind a
reliability threshold.  For that, use L</is_replicating>  and L</lag_behind_master>.
Since the implementation of those functions database specific (and not all DBIC
supported DB's support replication) you should refer your database specific
storage driver for more information.

=cut

has 'active' => (
    is=>'rw',
    isa=>'Bool',
    lazy=>1,
    required=>1,
    default=>1,
);

=head1 METHODS

This class defines the following methods.

=head2 after: _query_start

advice iof the _query_start method to add more debuggin

=cut

around '_query_start' => sub {
	my ($method, $self, $sql, @bind) = @_;
	my $dsn = $self->connect_info->[0];
	$self->$method("DSN: $dsn SQL: $sql", @bind);
};


=head1 AUTHOR

John Napiorkowski <john.napiorkowski@takkle.com>

=head1 LICENSE

You may distribute this code under the same terms as Perl itself.

=cut

1;