On Thursday, February 14, 2013 5:10:43 AM UTC-6, Andriy Yurchuk wrote:
>
> Found out that it's very simple: subscribe => Class['module::class_2']
>
> On Thursday, February 14, 2013 12:20:30 PM UTC+2, Andriy Yurchuk wrote:
>>
>> class module::class_1 {
>> service {
>> ensure => running,
>> hasrestart => true,
>> subscribe => File[/tmp/myfile],
>> }
>> }
>>
>> class module::class_2 {
>> file { '/tmp/myfile':
>> source => 'puppet:///file_server/my_file',
>> }
>> }
>>
>> Having those two classes, how do I correctly write the subscribeparameter in
>> class_1 so that it used the file resource from class_2?
>>
>
Although you can subscribe to the whole class, that's often not what you
want, as it really means subscribing to every resource declared by that
class. If only one resource is declared then that's no problem, but many
classes are more complicated.
A very important point here is that resources are global once they are
declared. Any resource, declared anywhere, can declare a relationship to
any other resource, declared anywhere else, and the sites of the
declarations do not factor into the syntax. The syntax in your example is
correct.
On the other hand, it is important to ensure that resources are declared
before references to them are used. If a resource declared in one class is
going to declare a relationship to a resource declared in a different one,
then you must make sure that the latter class is parsed before the former
one's resource declaration. As long as the latter class is not
parametrized, the easiest and best way to accomplish that is for the former
class to 'include' the latter at the top of its body:
class module::class_1 {
include 'module::class_2'
service {
ensure => running,
hasrestart => true,
subscribe => File[/tmp/myfile],
}
}
That also has the advantage of documenting the dependency between the two
classes. For it to work properly, however, you should arrange your classes
each in its own file, laid out in the way the autoloader expects.
John
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