use DBIx::Class::Storage::DBI::Replicated::Types qw/BalancerClassNamePart DBICSchema DBICStorageDBI/;
use MooseX::Types::Moose qw/ClassName HashRef Object/;
use Scalar::Util 'reftype';
-use Hash::Merge 'merge';
-use List::Util qw/min max/;
+use Hash::Merge;
+use List::Util qw/min max reduce/;
use namespace::clean -except => 'meta';
=head1 SYNOPSIS
The Following example shows how to change an existing $schema to a replicated
-storage type, add some replicated (readonly) databases, and perform reporting
+storage type, add some replicated (read-only) databases, and perform reporting
tasks.
You should set the 'storage_type attribute to a replicated type. You should
Warning: This class is marked BETA. This has been running a production
website using MySQL native replication as its backend and we have some decent
test coverage but the code hasn't yet been stressed by a variety of databases.
-Individual DB's may have quirks we are not aware of. Please use this in first
+Individual DBs may have quirks we are not aware of. Please use this in first
development and pass along your experiences/bug fixes.
This class implements replicated data store for DBI. Currently you can define
to all existing storages. This way our storage class is a drop in replacement
for L<DBIx::Class::Storage::DBI>.
-Read traffic is spread across the replicants (slaves) occuring to a user
+Read traffic is spread across the replicants (slaves) occurring to a user
selected algorithm. The default algorithm is random weighted.
=head1 NOTES
-The consistancy betweeen master and replicants is database specific. The Pool
+The consistency between master and replicants is database specific. The Pool
gives you a method to validate its replicants, removing and replacing them
when they fail/pass predefined criteria. Please make careful use of the ways
to force a query to run against Master when needed.
=head1 REQUIREMENTS
Replicated Storage has additional requirements not currently part of
-L<DBIx::Class> The missing requirements will be announced via an exception
-when you try to load this module. You will need to install these modules
-manually via CPAN or make them part of the Makefile for your distribution.
+L<DBIx::Class>. See L<DBIx::Class::Optional::Dependencies> for more details.
=head1 ATTRIBUTES
backup
is_datatype_numeric
+ _supports_insert_returning
_count_select
- _subq_count_select
_subq_update_delete
svp_rollback
svp_begin
_dbh_commit
_execute_array
_placeholders_supported
- _verify_pid
savepoints
_sqlt_minimum_version
_sql_maker_opts
_do_query
_dbh_sth
_dbh_execute
+ _prefetch_insert_auto_nextvals
+ _server_info_hash
/],
);
+my @unimplemented = qw(
+ _arm_global_destructor
+ _preserve_foreign_dbh
+ _verify_pid
+ _verify_tid
+);
+
+for my $method (@unimplemented) {
+ __PACKAGE__->meta->add_method($method, sub {
+ croak "$method must not be called on ".(blessed shift).' objects';
+ });
+}
+
has _master_connect_info_opts =>
(is => 'rw', isa => HashRef, default => sub { {} });
=head2 around: connect_info
-Preserve master's C<connect_info> options (for merging with replicants.)
-Also set any Replicated related options from connect_info, such as
+Preserves master's C<connect_info> options (for merging with replicants.)
+Also sets any Replicated-related options from connect_info, such as
C<pool_type>, C<pool_args>, C<balancer_type> and C<balancer_args>.
=cut
my $wantarray = wantarray;
+ my $merge = Hash::Merge->new('LEFT_PRECEDENT');
+
my %opts;
for my $arg (@$info) {
next unless (reftype($arg)||'') eq 'HASH';
- %opts = %{ merge($arg, \%opts) };
+ %opts = %{ $merge->merge($arg, \%opts) };
}
delete $opts{dsn};
if $opts{pool_type};
$self->pool_args(
- merge((delete $opts{pool_args} || {}), $self->pool_args)
+ $merge->merge((delete $opts{pool_args} || {}), $self->pool_args)
);
$self->pool($self->_build_pool)
if $opts{balancer_type};
$self->balancer_args(
- merge((delete $opts{balancer_args} || {}), $self->balancer_args)
+ $merge->merge((delete $opts{balancer_args} || {}), $self->balancer_args)
);
$self->balancer($self->_build_balancer)
$self->throw_exception('too many hashrefs in connect_info')
if @hashes > 2;
- my %opts = %{ merge(reverse @hashes) };
+ my $merge = Hash::Merge->new('LEFT_PRECEDENT');
+ my %opts = %{ $merge->merge(reverse @hashes) };
# delete them
splice @$r, $i+1, ($#{$r} - $i), ();
delete $master_opts{dbh_maker};
# merge with master
- %opts = %{ merge(\%opts, \%master_opts) };
+ %opts = %{ $merge->merge(\%opts, \%master_opts) };
# update
$r->[$i] = \%opts;
=head2 execute_reliably ($coderef, ?@args)
Given a coderef, saves the current state of the L</read_handler>, forces it to
-use reliable storage (ie sets it to the master), executes a coderef and then
+use reliable storage (e.g. sets it to the master), executes a coderef and then
restores the original state.
Example:
=head2 set_balanced_storage
Sets the current $schema to be use the </balancer> for all reads, while all
-writea are sent to the master only
+writes are sent to the master only
=cut
return min map $_->_ping, $self->all_storages;
}
+my $numify_ver = sub {
+ my $ver = shift;
+ my @numparts = split /\D+/, $ver;
+ my $format = '%d.' . (join '', ('%05d') x (@numparts - 1));
+
+ return sprintf $format, @numparts;
+};
+
+sub _server_info {
+ my $self = shift;
+
+ if (not $self->_server_info_hash) {
+ my $min_version_info = (
+ reduce { $a->[0] < $b->[0] ? $a : $b }
+ map [ $numify_ver->($_->{dbms_version}), $_ ],
+ map $_->_server_info, $self->all_storages
+ )->[1];
+
+ $self->_server_info_hash($min_version_info); # on master
+ }
+
+ return $self->_server_info_hash;
+}
+
+sub _get_server_version {
+ my $self = shift;
+
+ return $self->_server_info->{dbms_version};
+}
+
=head1 GOTCHAS
Due to the fact that replicants can lag behind a master, you must take care to
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