use DBI ();
use Carp::Clan qw/^DBIx::Class/;
use MooseX::Types::Moose qw/Num Int ClassName HashRef/;
+use DBIx::Class::Storage::DBI::Replicated::Types 'DBICStorageDBI';
+use Try::Tiny;
use namespace::clean -except => 'meta';
=head1 DESCRIPTION
In a replicated storage type, there is at least one replicant to handle the
-read only traffic. The Pool class manages this replicant, or list of
+read-only traffic. The Pool class manages this replicant, or list of
replicants, and gives some methods for querying information about their status.
=head1 ATTRIBUTES
This is an integer representing a time since the last time the replicants were
validated. It's nothing fancy, just an integer provided via the perl L<time|perlfunc/time>
-builtin.
+built-in.
=cut
=head2 replicants
A hashref of replicant, with the key being the dsn and the value returning the
-actual replicant storage. For example if the $dsn element is something like:
+actual replicant storage. For example, if the $dsn element is something like:
"dbi:SQLite:dbname=dbfile"
=item delete_replicant ($key)
-removes the replicant under $key from the pool
+Removes the replicant under $key from the pool
=back
},
);
+=head2 master
+
+Reference to the master Storage.
+
+=cut
+
+has master => (is => 'rw', isa => DBICStorageDBI, weak_ref => 1);
+
=head1 METHODS
This class defines the following methods.
$replicant->_determine_driver
});
- DBIx::Class::Storage::DBI::Replicated::Replicant->meta->apply($replicant);
+ Moose::Meta::Class->initialize(ref $replicant);
+
+ DBIx::Class::Storage::DBI::Replicated::Replicant->meta->apply($replicant);
+
+ # link back to master
+ $replicant->master($self->master);
+
return $replicant;
}
connect. For the master database this is desirable, but since replicants are
allowed to fail, this behavior is not desirable. This method wraps the call
to ensure_connected in an eval in order to catch any generated errors. That
-way a slave can go completely offline (ie, the box itself can die) without
+way a slave can go completely offline (e.g. the box itself can die) without
bringing down your entire pool of databases.
=cut
sub _safely {
my ($self, $replicant, $name, $code) = @_;
- eval {
- $code->()
- };
- if ($@) {
+ return try {
+ $code->();
+ 1;
+ } catch {
$replicant->debugobj->print(sprintf(
"Exception trying to $name for replicant %s, error is %s",
- $replicant->_dbi_connect_info->[0], $@)
+ $replicant->_dbi_connect_info->[0], $_)
);
- return undef;
- }
-
- return 1;
+ undef;
+ };
}
=head2 connected_replicants
defined by L</maximum_lag>. Replicants that fail any of these tests are set to
inactive, and thus removed from the replication pool.
-This tests L<all_replicants>, since a replicant that has been previous marked
-as inactive can be reactived should it start to pass the validation tests again.
+This tests L</all_replicants>, since a replicant that has been previous marked
+as inactive can be reactivated should it start to pass the validation tests again.
See L<DBIx::Class::Storage::DBI> for more about checking if a replicating
connection is not following a master or is lagging.