X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FStorage%2FDBI%2FReplicated.pm;h=c6b7b1285eb094e2a4c67c0d3f61b5e964b8818d;hb=ab0b0a09ce7fa52d1cf35f91199093460dec9d2c;hp=9a9e05fbeeca13c9590612bde1e06bc8fd2ebbdd;hpb=0e773352a9c6c034dfb2526b8d68bf6ac1e2323b;p=dbsrgits%2FDBIx-Class-Historic.git

diff --git a/lib/DBIx/Class/Storage/DBI/Replicated.pm b/lib/DBIx/Class/Storage/DBI/Replicated.pm
index 9a9e05f..c6b7b12 100644
--- a/lib/DBIx/Class/Storage/DBI/Replicated.pm
+++ b/lib/DBIx/Class/Storage/DBI/Replicated.pm
@@ -15,11 +15,13 @@ use MooseX::Types::Moose qw/ClassName HashRef Object/;
 use Scalar::Util 'reftype';
 use Hash::Merge;
 use List::Util qw/min max reduce/;
+use Context::Preserve 'preserve_context';
 use Try::Tiny;
-use namespace::clean;
 
 use namespace::clean -except => 'meta';
 
+=encoding utf8
+
 =head1 NAME
 
 DBIx::Class::Storage::DBI::Replicated - BETA Replicated database support
@@ -56,9 +58,9 @@ be delegated to the replicants, while writes to the master.
 You can force a given query to use a particular storage using the search
 attribute 'force_pool'.  For example:
 
-  my $RS = $schema->resultset('Source')->search(undef, {force_pool=>'master'});
+  my $rs = $schema->resultset('Source')->search(undef, {force_pool=>'master'});
 
-Now $RS will force everything (both reads and writes) to use whatever was setup
+Now $rs will force everything (both reads and writes) to use whatever was setup
 as the master storage.  'master' is hardcoded to always point to the Master,
 but you can also use any Replicant name.  Please see:
 L<DBIx::Class::Storage::DBI::Replicated::Pool> and the replicants attribute for more.
@@ -68,8 +70,12 @@ force read traffic to the master.  In general, you should wrap your statements
 in a transaction when you are reading and writing to the same tables at the
 same time, since your replicants will often lag a bit behind the master.
 
-See L<DBIx::Class::Storage::DBI::Replicated::Instructions> for more help and
-walkthroughs.
+If you have a multi-statement read only transaction you can force it to select
+a random server in the pool by:
+
+  my $rs = $schema->resultset('Source')->search( undef,
+    { force_pool => $db->storage->read_handler->next_storage }
+  );
 
 =head1 DESCRIPTION
 
@@ -268,13 +274,15 @@ my $method_dispatch = {
     txn_commit
     txn_rollback
     txn_scope_guard
+    _exec_txn_rollback
+    _exec_txn_begin
+    _exec_txn_commit
     deploy
     with_deferred_fk_checks
     dbh_do
     _prep_for_execute
     is_datatype_numeric
     _count_select
-    _subq_update_delete
     svp_rollback
     svp_begin
     svp_release
@@ -292,18 +300,14 @@ my $method_dispatch = {
     transaction_depth
     _dbh
     _select_args
-    _dbh_execute_array
+    _dbh_execute_for_fetch
     _sql_maker
-    _per_row_update_delete
-    _dbh_begin_work
     _dbh_execute_inserts_with_no_binds
     _select_args_to_query
+    _gen_sql_bind
     _svp_generate_name
-    _multipk_update_delete
     _normalize_connect_info
     _parse_connect_do
-    _dbh_commit
-    _execute_array
     savepoints
     _sql_maker_opts
     _conn_pid
@@ -311,20 +315,10 @@ my $method_dispatch = {
     _native_data_type
     _get_dbh
     sql_maker_class
-    _dbh_rollback
-    _adjust_select_args_for_complex_prefetch
-    _resolve_ident_sources
-    _resolve_column_info
-    _prune_unused_joins
-    _strip_cond_qualifiers
-    _strip_cond_qualifiers_from_array
-    _resolve_aliastypes_from_select_args
     _execute
     _do_query
-    _sth
-    _dbh_sth
     _dbh_execute
-  /],
+  /, Class::MOP::Class->initialize('DBIx::Class::Storage::DBIHacks')->get_method_list ],
   reader => [qw/
     select
     select_single
@@ -336,8 +330,6 @@ my $method_dispatch = {
     _arm_global_destructor
     _verify_pid
 
-    source_bind_attributes
-
     get_use_dbms_capability
     set_use_dbms_capability
     get_dbms_capability
@@ -345,22 +337,28 @@ my $method_dispatch = {
     _dbh_details
     _dbh_get_info
 
+    _determine_connector_driver
+    _describe_connection
+    _warn_undetermined_driver
+
     sql_limit_dialect
     sql_quote_char
     sql_name_sep
 
-    _inner_join_to_node
-    _group_over_selection
-    _extract_order_criteria
-
     _prefetch_autovalues
+    _perform_autoinc_retrieval
+    _autoinc_supplied_for_op
+
+    _resolve_bindattrs
 
     _max_column_bytesize
     _is_lob_type
     _is_binary_lob_type
+    _is_binary_type
     _is_text_lob_type
 
-    sth
+    _prepare_sth
+    _bind_sth_params
   /,(
     # the capability framework
     # not sure if CMOP->initialize does evil things to DBIC::S::DBI, fix if a problem
@@ -399,7 +397,7 @@ if (DBIx::Class::_ENV_::DBICTEST) {
 for my $method (@{$method_dispatch->{unimplemented}}) {
   __PACKAGE__->meta->add_method($method, sub {
     my $self = shift;
-    $self->throw_exception("$method must not be called on ".(blessed $self).' objects');
+    $self->throw_exception("$method() must not be called on ".(blessed $self).' objects');
   });
 }
 
@@ -448,6 +446,11 @@ C<pool_type>, C<pool_args>, C<balancer_type> and C<balancer_args>.
 around connect_info => sub {
   my ($next, $self, $info, @extra) = @_;
 
+  $self->throw_exception(
+    'connect_info can not be retrieved from a replicated storage - '
+  . 'accessor must be called on a specific pool instance'
+  ) unless defined $info;
+
   my $merge = Hash::Merge->new('LEFT_PRECEDENT');
 
   my %opts;
@@ -484,24 +487,19 @@ around connect_info => sub {
 
   $self->_master_connect_info_opts(\%opts);
 
-  my @res;
-  if (wantarray) {
-    @res = $self->$next($info, @extra);
-  } else {
-    $res[0] = $self->$next($info, @extra);
-  }
+  return preserve_context {
+    $self->$next($info, @extra);
+  } after => sub {
+    # Make sure master is blessed into the correct class and apply role to it.
+    my $master = $self->master;
+    $master->_determine_driver;
+    Moose::Meta::Class->initialize(ref $master);
 
-  # Make sure master is blessed into the correct class and apply role to it.
-  my $master = $self->master;
-  $master->_determine_driver;
-  Moose::Meta::Class->initialize(ref $master);
+    DBIx::Class::Storage::DBI::Replicated::WithDSN->meta->apply($master);
 
-  DBIx::Class::Storage::DBI::Replicated::WithDSN->meta->apply($master);
-
-  # link pool back to master
-  $self->pool->master($master);
-
-  wantarray ? @res : $res[0];
+    # link pool back to master
+    $self->pool->master($master);
+  };
 };
 
 =head1 METHODS
@@ -682,41 +680,22 @@ inserted something and need to get a resultset including it, etc.
 =cut
 
 sub execute_reliably {
-  my ($self, $coderef, @args) = @_;
+  my $self = shift;
+  my $coderef = shift;
 
   unless( ref $coderef eq 'CODE') {
     $self->throw_exception('Second argument must be a coderef');
   }
 
-  ##Get copy of master storage
-  my $master = $self->master;
-
-  ##Get whatever the current read hander is
-  my $current = $self->read_handler;
+  ## replace the current read handler for the remainder of the scope
+  local $self->{read_handler} = $self->master;
 
-  ##Set the read handler to master
-  $self->read_handler($master);
-
-  ## do whatever the caller needs
-  my @result;
-  my $want_array = wantarray;
-
-  try {
-    if($want_array) {
-      @result = $coderef->(@args);
-    } elsif(defined $want_array) {
-      ($result[0]) = ($coderef->(@args));
-    } else {
-      $coderef->(@args);
-    }
+  my $args = \@_;
+  return try {
+    $coderef->(@$args);
   } catch {
     $self->throw_exception("coderef returned an error: $_");
-  } finally {
-    ##Reset to the original state
-    $self->read_handler($current);
   };
-
-  return wantarray ? @result : $result[0];
 }
 
 =head2 set_reliable_storage