puppet Exec always runs even if the subscribed create_resource doesn't run - puppet

Question

I have attached report screenshot from foreman and pasted below is the class that I am having issue with.
If it's hard to go through the entire code, I am highlighting the Exec section that is not working as expected
exec { $service:
path => ["/usr/bin/","/usr/sbin/","/bin"],
subscribe => Domain_ip_map[$domain_ip_map_titles],
command => "sudo service nagios restart",
}
The above Exec[$service] is subscribed to Domain_ip_map[...], this in turn notified by Exec['purge-config-files'] which require => File['deployconfig.cfg'].
Since there is no change in deployconfig.cfg file, File['deployconfig.cfg'] doesn't run and hence no notify, so Exec['purge-config-files'] and custom Domain_ip_map resource doesn't run. Up to this point everything working as expected. But the last part, Exec[$service] is subscribed to Domain_ip_map.
When Domain_ip_map is not running, how can Exec[$service] execute
successfully ?
class testclass ( $data = {
item1 => {
domain => 'testdomain.com',
ipaddress => '1.1.1.1',
},
},
$baseconfigdir = '/usr/local/servers',
$config_file_host = '/usr/local/test.cfg',
$config_file_service = '/usr/local/test_service.cfg' ) {
validate_hash($data)
$domain_ip_map_titles = keys($data)
file { "${baseconfigdir}":
ensure => directory,
}
exec { 'purge-config-files':
command => "/bin/rm -f ${baseconfigdir}/*",
notify => Domain_ip_map[$domain_ip_map_titles],
require => File['deployconfig.cfg'],
refreshonly => true,
}
file { 'deployconfig.cfg':
ensure => file,
path => '/home/deployconfig.cfg',
mode => '0644',
owner => 'root',
group => 'root',
content => "test",
notify => Exec['purge-config-files'],
}
#problem here, its subscribed to Domain_ip_map, but even if Domain_ip_map doesn't run, Exec['$service'] always execute, how???
exec { $service:
path => ["/usr/bin/","/usr/sbin/","/bin"],
subscribe => Domain_ip_map[$domain_ip_map_titles],
command => "sudo service nagios restart",
}
create_resources(domain_ip_map, $data)
}
define domain_ip_map($domain, $ipaddress) {
nagios_host { $domain:
....
}
nagios_service { "check_ping_${domain}":
....
}
}