X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FSchema.pm;h=65c235c2cb2d3a09fbcc40a437c2d0eb9624e5f1;hb=e6efde04063f1374151f9f76ef1e7c23a045e91e;hp=b3f83309e6a37a390e6500664d1cbc4cd906762b;hpb=ecceadffaefdd6a2b8b41a2ec1e108fe25d57771;p=dbsrgits%2FDBIx-Class.git

diff --git a/lib/DBIx/Class/Schema.pm b/lib/DBIx/Class/Schema.pm
index b3f8330..65c235c 100644
--- a/lib/DBIx/Class/Schema.pm
+++ b/lib/DBIx/Class/Schema.pm
@@ -29,14 +29,15 @@ DBIx::Class::Schema - composable schemas
   __PACKAGE__->load_components(qw/PK::Auto::Pg Core/); # for example
   __PACKAGE__->table('foo');
 
+  # Elsewhere in your code:
   my $schema1 = My::Schema->connect(
     $dsn,
     $user,
     $password,
     $attrs
   );
-
-  my $schema2 = My::Schema->connect( ... );
+  
+  my $schema2 = My::Schema->connect($coderef_returning_dbh);
 
   # fetch objects using My::Schema::Foo
   my $resultset = $schema1->resultset('Foo')->search( ... );
@@ -54,11 +55,13 @@ particular which module inherits off which.
 
 =head1 METHODS
 
-=head2 register_class <moniker> <component_class>
+=head2 register_class
+
+=head3 Arguments: <moniker> <component_class>
 
 Registers a class which isa ResultSourceProxy; equivalent to calling
 
-  $schema->register_source($moniker, $class->result_source_instance);
+  $schema->register_source($moniker, $component_class->result_source_instance);
 
 =cut
 
@@ -67,7 +70,9 @@ sub register_class {
   $self->register_source($moniker => $to_register->result_source_instance);
 }
 
-=head2 register_source <moniker> <result source>
+=head2 register_source
+
+=head3 Arguments: <moniker> <result source>
 
 Registers the result source in the schema with the given moniker
 
@@ -142,7 +147,9 @@ sub resultset {
   return $self->source($moniker)->resultset;
 }
 
-=head2  load_classes [<classes>, (<class>, <class>), {<namespace> => [<classes>]}]
+=head2 load_classes
+
+=head3 Arguments: [<classes>, (<class>, <class>), {<namespace> => [<classes>]}]
 
 Uses L<Module::Find> to find all classes under the database class' namespace,
 or uses the classes you select.  Then it loads the component (using L<use>), 
@@ -189,20 +196,32 @@ sub load_classes {
     $comps_for{$class} = \@comp;
   }
 
-  foreach my $prefix (keys %comps_for) {
-    foreach my $comp (@{$comps_for{$prefix}||[]}) {
-      my $comp_class = "${prefix}::${comp}";
-      eval "use $comp_class"; # If it fails, assume the user fixed it
-      if ($@) {
-        die $@ unless $@ =~ /Can't locate/;
+  my @to_register;
+  {
+    no warnings qw/redefine/;
+    local *Class::C3::reinitialize = sub { };
+    foreach my $prefix (keys %comps_for) {
+      foreach my $comp (@{$comps_for{$prefix}||[]}) {
+        my $comp_class = "${prefix}::${comp}";
+        eval "use $comp_class"; # If it fails, assume the user fixed it
+        if ($@) {
+          die $@ unless $@ =~ /Can't locate/;
+        }
+        push(@to_register, [ $comp, $comp_class ]);
       }
-      $class->register_class($comp => $comp_class);
-      #  if $class->can('result_source_instance');
     }
   }
+  Class::C3->reinitialize;
+
+  foreach my $to (@to_register) {
+    $class->register_class(@$to);
+    #  if $class->can('result_source_instance');
+  }
 }
 
-=head2 compose_connection <target> <@db_info>
+=head2 compose_connection
+
+=head3 Arguments: <target> <@db_info>
 
 This is the most important method in this class. it takes a target namespace,
 as well as dbh connection info, and creates a L<DBIx::Class::DB> class as
@@ -288,7 +307,9 @@ sub compose_namespace {
   return $schema;
 }
 
-=head2 setup_connection_class <$target> <@info>
+=head2 setup_connection_class
+
+=head3 Arguments: <$target> <@info>
 
 Sets up a database connection class to inject between the schema
 and the subclasses the schema creates.
@@ -302,7 +323,9 @@ sub setup_connection_class {
   $target->connection(@info);
 }
 
-=head2 connection(@args)
+=head2 connection
+
+=head3 Arguments: (@args)
 
 Instantiates a new Storage object of type storage_type and passes the
 arguments to $storage->connect_info. Sets the connection in-place on
@@ -324,13 +347,132 @@ sub connection {
   return $self;
 }
 
-=head2 connect(@info)
+=head2 connect
+
+=head3 Arguments: (@info)
 
 Conveneience method, equivalent to $schema->clone->connection(@info)
 
 =cut
 
-sub connect { shift->clone->connection(@_) };
+sub connect { shift->clone->connection(@_) }
+
+=head2 txn_begin
+
+Begins a transaction (does nothing if AutoCommit is off).
+
+=cut
+
+sub txn_begin { shift->storage->txn_begin }
+
+=head2 txn_commit
+
+Commits the current transaction.
+
+=cut
+
+sub txn_commit { shift->storage->txn_commit }
+
+=head2 txn_rollback
+
+Rolls back the current transaction.
+
+=cut
+
+sub txn_rollback { shift->storage->txn_rollback }
+
+=head2 txn_do
+
+=head3 Arguments: <$coderef>, [@coderef_args]
+
+Executes C<$coderef> with (optional) arguments C<@coderef_args>
+transactionally, returning its result (if any). If an exception is
+caught, a rollback is issued and the exception is rethrown. If the
+rollback fails, (i.e. throws an exception) an exception is thrown that
+includes a "Rollback failed" message.
+
+For example,
+
+  my $foo = $schema->resultset('foo')->find(1);
+
+  my $coderef = sub {
+    my ($foo, @bars) = @_;
+
+    # If any one of these fails, the entire transaction fails
+    $foo->create_related('bars', {
+      col => $_
+    }) foreach (@bars);
+
+    return $foo->bars;
+  };
+
+  my $rs;
+  eval {
+    $rs = $schema->txn_do($coderef, $foo, qw/foo bar baz/);
+  };
+
+  if ($@) {
+    my $error = $@;
+    if ($error =~ /Rollback failed/) {
+      die "something terrible has happened!";
+    } else {
+      deal_with_failed_transaction();
+      die $error;
+    }
+  }
+
+Nested transactions work as expected (i.e. only the outermost
+transaction will issue a txn_commit on the Schema's storage)
+
+=cut
+
+sub txn_do {
+  my ($self, $coderef, @args) = @_;
+
+  ref $self or $self->throw_exception
+    ('Cannot execute txn_do as a class method');
+  ref $coderef eq 'CODE' or $self->throw_exception
+    ('$coderef must be a CODE reference');
+
+  my (@return_values, $return_value);
+
+  $self->txn_begin; # If this throws an exception, no rollback is needed
+
+  my $wantarray = wantarray; # Need to save this since it's reset in eval{}
+
+  eval {
+    # Need to differentiate between scalar/list context to allow for returning
+    # a list in scalar context to get the size of the list
+    if ($wantarray) {
+      @return_values = $coderef->(@args);
+    } else {
+      $return_value = $coderef->(@args);
+    }
+    $self->txn_commit;
+  };
+
+  if ($@) {
+    my $error = $@;
+
+    eval {
+      $self->txn_rollback;
+    };
+
+    if ($@) {
+      my $rollback_error = $@;
+      my $exception_class = "DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION";
+      $self->throw_exception($error)  # propagate nested rollback
+	if $rollback_error =~ /$exception_class/;
+
+      $self->throw_exception("Transaction aborted: $error. Rollback failed: ".
+                             $rollback_error);
+    } else {
+      $self->throw_exception($error); # txn failed but rollback succeeded
+    }
+  }
+
+  return $wantarray ? @return_values : $return_value;
+}
 
 =head2 clone
 
@@ -350,18 +492,20 @@ sub clone {
   return $clone;
 }
 
-=head2 populate($moniker, \@data);
+=head2 populate
+
+=head3 Arguments: ($moniker, \@data);
 
 Populates the source registered with the given moniker with the supplied data.
 @data should be a list of listrefs, the first containing column names, the
 second matching values - i.e.
 
-$schema->populate('Foo', [
-  [ qw/foo_id foo_string/ ],
-  [ 1, 'One' ],
-  [ 2, 'Two' ],
-  ...
-]);
+  $schema->populate('Foo', [
+    [ qw/foo_id foo_string/ ],
+    [ 1, 'One' ],
+    [ 2, 'Two' ],
+    ...
+  ]);
 
 =cut
 
@@ -387,6 +531,18 @@ sub throw_exception {
   croak @_;
 }
 
+=head2 deploy
+
+Attempts to deploy the schema to the current storage
+
+=cut
+
+sub deploy {
+  my ($self) = shift;
+  $self->throw_exception("Can't deploy without storage") unless $self->storage;
+  $self->storage->deploy($self);
+}
+
 1;
 
 =head1 AUTHORS