From: Norbert Csongradi <bert@cpan.org>
Date: Fri, 15 Sep 2006 17:00:57 +0000 (+0200)
Subject: Initial revision (but working :).
X-Git-Tag: v0.08010~43^2~7
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=325e346643ef8bbdc6430fa2a0f32a28a9e77f0f;p=dbsrgits%2FDBIx-Class.git

Initial revision (but working :).
---

diff --git a/lib/DBIx/Class/Storage/DBI/Replication.pm b/lib/DBIx/Class/Storage/DBI/Replication.pm
new file mode 100644
index 0000000..93a8a8f
--- /dev/null
+++ b/lib/DBIx/Class/Storage/DBI/Replication.pm
@@ -0,0 +1,207 @@
+package DBIx::Class::Storage::DBI::Replication;
+
+use strict;
+use warnings;
+
+use DBIx::Class::Storage::DBI;
+use DBD::Multi;
+use base qw/Class::Accessor::Fast/;
+
+__PACKAGE__->mk_accessors( qw/read_source write_source/ );
+
+=head1 NAME
+
+DBIx::Class::Storage::DBI::Replication - Replicated database support
+
+=head1 SYNOPSIS
+
+  # change storage_type in your schema class
+    $schema->storage_type( '::DBI::Replication' );
+    $schema->connect_info( [
+		     [ "dbi:mysql:database=test;hostname=master", "username", "password", { AutoCommit => 1 } ], # master
+		     [ "dbi:mysql:database=test;hostname=slave1", "username", "password", { priority => 10 } ],  # slave1
+		     [ "dbi:mysql:database=test;hostname=slave2", "username", "password", { priority => 10 } ],  # slave2
+		     <...>
+		    ] );
+
+=head1 DESCRIPTION
+
+This class implements replicated data store for DBI. Currently you can define one master and numerous slave database
+connections. All write-type queries (INSERT, UPDATE, DELETE and even LAST_INSERT_ID) are routed to master database,
+all read-type queries (SELECTs) go to the slave database.
+
+For every slave database you can define a priority value, which controls data source usage pattern. It uses
+L<DBD::Multi>, so first the lower priority data sources used (if they have the same priority, the are used
+randomized), than if all low priority data sources fail, higher ones tried in order.
+
+=cut
+
+sub new {
+    my $proto = shift;
+    my $class = ref( $proto ) || $proto;
+    my $self = {
+	read_sources => [],
+	read_iterator => 0,
+    };
+
+    bless( $self, $class );
+
+    $self->write_source( DBIx::Class::Storage::DBI->new );
+    $self->read_source( DBIx::Class::Storage::DBI->new );
+
+    return $self;
+}
+
+sub all_sources {
+    my $self = shift;
+
+    my @sources = ($self->{read_source}, $self->write_source);
+
+    return wantarray ? @sources : \@sources;
+}
+
+sub connect_info {
+    my( $self, $source_info ) = @_;
+
+    $self->write_source->connect_info( $source_info->[0] );
+
+    my @dsns = map { ($_->[3]->{priority} || 10) => $_ } @{$source_info}[1..@$source_info-1];
+    $self->read_source->connect_info( [ 'dbi:Multi:', undef, undef, { dsns => \@dsns } ] );
+}
+
+sub select {
+    return shift->read_source()->select( @_ );
+}
+sub select_single {
+    return shift->read_source()->select_single( @_ );
+}
+sub throw_exception {
+    return shift->read_source()->throw_exception( @_ );
+}
+sub sql_maker {
+    return shift->read_source()->sql_maker( @_ );
+}
+sub columns_info_for {
+    return shift->read_source()->columns_info_for( @_ );
+}
+sub sqlt_type {
+    return shift->read_source()->sqlt_type( @_ );
+}
+sub create_ddl_dir {
+    return shift->read_source()->create_ddl_dir( @_ );
+}
+sub deployment_statements {
+    return shift->read_source()->deployment_statements( @_ );
+}
+sub datetime_parser {
+    return shift->read_source()->datetime_parser( @_ );
+}
+sub datetime_parser_type {
+    return shift->read_source()->datetime_parser_type( @_ );
+}
+sub build_datetime_parser {
+    return shift->read_source()->build_datetime_parser( @_ );
+}
+
+sub limit_dialect {
+    my $self = shift;
+    $self->$_->limit_dialect( @_ ) for( $self->all_sources() );
+}
+sub quote_char {
+    my $self = shift;
+    $self->$_->quote_char( @_ ) for( $self->all_sources() );
+}
+sub name_sep {
+    my $self = shift;
+    $self->$_->quote_char( @_ ) for( $self->all_sources() );
+}
+sub disconnect {
+    my $self = shift;
+    $self->$_->disconnect( @_ ) for( $self->all_sources() );
+}
+sub DESTROY {
+    my $self = shift;
+
+    $self->{write_source} = undef;
+    $self->{read_sources} = undef;
+}
+
+sub last_insert_id {
+    return shift->write_source()->last_insert_id( @_ );
+}
+sub insert {
+    return shift->write_source()->insert( @_ );
+}
+sub update {
+    return shift->write_source()->update( @_ );
+}
+sub update_all {
+    return shift->write_source()->update_all( @_ );
+}
+sub delete {
+    return shift->write_source()->delete( @_ );
+}
+sub delete_all {
+    return shift->write_source()->delete_all( @_ );
+}
+sub create {
+    return shift->write_source()->create( @_ );
+}
+sub find_or_create {
+    return shift->write_source()->find_or_create( @_ );
+}
+sub update_or_create {
+    return shift->write_source()->update_or_create( @_ );
+}
+sub connected {
+    return shift->write_source()->connected( @_ );
+}
+sub ensure_connected {
+    return shift->write_source()->ensure_connected( @_ );
+}
+sub dbh {
+    return shift->write_source()->dbh( @_ );
+}
+sub txn_begin {
+    return shift->write_source()->txn_begin( @_ );
+}
+sub txn_commit {
+    return shift->write_source()->txn_commit( @_ );
+}
+sub txn_rollback {
+    return shift->write_source()->txn_rollback( @_ );
+}
+sub sth {
+    return shift->write_source()->sth( @_ );
+}
+sub deploy {
+    return shift->write_source()->deploy( @_ );
+}
+
+
+sub debugfh { shift->_not_supported( 'debugfh' ) };
+sub debugcb { shift->_not_supported( 'debugcb' ) };
+
+sub _not_supported {
+    my( $self, $method ) = @_;
+
+    die "This Storage does not support $method method.";
+}
+
+=head1 SEE ALSO
+
+L<DBI::Class::Storage::DBI>, L<DBD::Multi>, L<DBI>
+
+=head1 AUTHOR
+
+Norbert Csongrádi <bert@cpan.org>
+
+Peter Siklósi <einon@ahq.hu>
+
+=head1 LICENSE
+
+You may distribute this code under the same terms as Perl itself.
+
+=cut
+
+1;