Puppet users - May 2014 - Retrieve resource names of a given type without using the filesystem

I'd like to do something like this


define mytype() {}

define delete_mytype() {}

mytype { 'a': }
mytype { 'b': }
mytype { 'c': }

$existing_mytypes = # something from facter

# but this doesn't work
$wanted_mytypes = Mytype <||>
  
Mytype<||> -> Delete_mytype<||>

delete_mytype { diff( $existing_mytypes, $wanted_mytypes ) }


I believe I could do something along those lines but it creates as many 
files as mytype invocation :


defined mytype() {
   # persist $name in the filesystem
}

class prepare_mytypes {
  # cleanup files created by previous invocation of mytype
}

Class['prepare_mytypes'] ->
  Mytype<||> -> 
    Class['remove_old_mytypes']

class remove_old_mytypes {

  # look for files created by mytype
  # perform the same diff as explained above
}


Any idea?

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