On Mon, Jun 28, 2010 at 10:22 AM, Antony Mayi <[email protected]> wrote:
> this topic is currently being massively discussed so I just would like to
> share my pain also.
>
> my intention was to have an array of node's roles and each included role
> class would just record into the array its role identificator. then I could
> write simple function has_role and then write various condition with role
> checks. imho this would be awesome however impossible to implement with
> variable scoping.
>
> individual roles would be defined as classes as follows (this is just an
> example demonstrating the varscope issue so don't try to find a workaround
> for this simple case as I am more interested how to implement this whole
> idea):
>
> class root_role {
> $node_roles = []
> }
>
> class role_mysql extends root_role {
> $node_roles += [ "role_mysql" ]
> include mysql
> }
>
> class role_postgres extends root_role {
> $node_roles += [ "role_postgres" ]
> include mysql
> }
>
> class role_basehost {
> if has_role("role_postgres") {
> <some action>
>
why cant this logic just go in the role postgres class?
> } else {
> <another action>
> }
> }
>
> node lamp {
> include role_postgres
> include role_basehost
> }
>
> obviously this doesn't work. maybe you have now idea to use directly the
> $root_role::node_roles and reference it in all other roles however that
> wouldn't work neither cause the qualified variables from other classes are
> readonly.
>
you could always embed this kind of logic in an external node classifier.
> this is pain, pain and again pain!
> cry with me,
> Antony.
>
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