On Feb 17, 3:48 am, ruslan usifov <ruslan.usi...@gmail.com> wrote:
> 2012/2/15 jcbollinger <john.bollin...@stjude.org>
>
>
>
> > On Feb 14, 10:41 am, Nan Liu <n...@puppetlabs.com> wrote:
> > > On Tue, Feb 14, 2012 at 6:49 AM, ruslan usifov <ruslan.usi...@gmail.com>
> > wrote:
> > > > Hello
>
> > > > In is possible inherits from parametrized class??
>
> > Is class inheritance really would you should be using? If your
> > intention is for the child class to override properties of resources
> > declared by the parent class, then yes; otherwise no. From your
> > example it appears no resource overriding is intended, so probably
>
> "no".
>
> I think yes, for example i use in linux::php52, follow service definition
>
> service
> {
> "php-fpm":
> require => [ File["/usr/local/etc/php-fpm.conf"], Package["php52"],
> File["/var/log/php-fpm/"], File["/etc/init.d/php-fpm"] ];
>
> }
>
> and in derived class i want for standalone(linux::php52::standalone)
> configuration restart service when config files changed like this:
>
> Service["php-fpm"]
> {
> ensure => true,
> enable => true,
> hasrestart => true,
> subscribe => [ File["/usr/local/etc/php-fpm.conf"],
> File["/usr/local/etc/php.ini"], File["/etc/init.d/php-fpm"],
> Package["php52"] ];
>
> }
>
> and in cluster class do nothing(restart of php will be made by cluster
> stack) like this:
>
> Service["php-fpm"]
> {
> enable => false
>
> }
>
> How cant accomplish this be composition? I would be very grateful
If no node uses linux::php52 directly (every node uses either
linux::php52::standalone or linux::php52::cluster) then just remove
the service declaration from linux::php52 and put separate ones in
linux::php52::standalone and linux::php52::cluster.
That makes especial sense in this example because the two erstwhile
subclasses don't need any Service["php-fpm"] property values in
common: the "require" property they both inherit is redundant with the
"subscribe" property that the standalone class provides.
Class inheritance is a convenience in certain special circumstances,
but only a complication in most. You don't ever need it in any
absolute sense.
John
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