Re: [HACKERS] TAP: allow overriding PostgresNode in get_new_node

On 31 May 2017 at 08:43, Craig Ringer <craig@2ndquadrant.com> wrote:
> Hi all
>
> More and more I'm finding it useful to extend PostgresNode for project
> specific helper classes. But PostgresNode::get_new_node is a factory
> that doesn't provide any mechanism for overriding, so you have to
> create a PostgresNode then re-bless it as your desired subclass. Ugly.
>
> The attached patch allows an optional second argument, a class name,
> to be passed to PostgresNode::get_new_node . It's instantiated instead
> of PostgresNode if supplied. Its 'new' constructor must take the same
> arguments.

Note that you can achieve the same effect w/o patching
PostgresNode.pm, albeit in a somewhat ugly manner, by re-blessing the
returned object.

sub get_new_mywhatever_node {       my $self = PostgresNode::get_new_node($name);       $self = bless $self,
'MyWhateverNode';      return $self;
 
}

so this would be cosmetically nice, but far from functionally vital.

-- Craig Ringer                   http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training & Services