[chef] Re: Re: Notifications order and grouping

[Daniel DeLeo < >]

On Sunday, January 22, 2012 at 9:14 AM, Steffen Gebert wrote:

> Thanks for your response, Daniel!
> 
> > Depending on your constraints, you may be best off creating an LWRP for 
> > your group of resources and notifying it.
> 
> How can I notify that LWRP?
> 
> Created it like this in providers/apply_config.rb:
> > action :run do
> > execute "SetPermissions" do
> > ...
> > end
> > 
> > # Rebuild ZZZAAuto.pm
> > execute "RebuildConfig" do
> > ...
> > end
> > end
> 


Resources and providers always come in pairs. In the recipe DSL, you create 
resources which represent a desired state of the system, while the provider 
does the work of ensuring the system is in the state the resource specified. 
So you need a resource to go with your provider, then stick it in your recipe 
the same as you would a built-in resource.

See also: 
http://wiki.opscode.com/display/chef/Lightweight+Resources+and+Providers+%28LWRP%29
 
> 
> 
> 
> But how to notify it? My only guess was
> > notifies :run, "providers[apply_config]"
> 
> 
> 
> which, of course, does not work.
> 
> Thanks in advance
> Steffen
> 
> On 21.01.2012, at 20:07, Daniel DeLeo wrote:
> 
> > 
> > 
> > On Saturday, January 21, 2012 at 2:41 AM, Steffen Gebert wrote:
> > 
> > > Hi list!
> > > 
> > > Can I be sure that resources notified by delayed notifications are 
> > > executed in the same order as they were notified? Or is this 
> > > non-deterministic?
> > Delayed notifications are queued in the order received. One possible 
> > gotcha here is that duplicate notifications are quashed, so if you send 
> > notifications A, B, C, A, you end up with just A, B, C, and the last one 
> > is ignored.
> > 
> > > 
> > > And is it possible to group resource and notify them at once? e.g. I 
> > > want to execute some scripts but don't want to list every single one of 
> > > them at many places. So can I just notify one resource, which then 
> > > includes a bunch of resources to execute?
> > Depending on your constraints, you may be best off creating an LWRP for 
> > your group of resources and notifying it.
> > 
> > > 
> > > Thanks for your help
> > > Steffen
> > 
> > 
HTH,

-- 
Dan DeLeo