gistfile1.pp

class sshd::data {

  $enable = extlookup('sshd_enable', 'present')

}

class sshd {

  include sshd::params, sshd::data

  case $sshd::data::enable {
    'absent': { include sshd::absent }  
    'disable': { include sshd::service::disable }
    default: { 
      include sshd::install, sshd::config, sshd::service
      Class['sshd::install'] -> Class['sshd::config'] ~> Class['sshd::service']
    }
  }

}

class sshd::install {

  package { 'sshd':
    ensure => $sshd::data::enable,
    name   => $sshd::params::packagename,
  }

}