Possible way to stop/start services in a puppet run.

service_window

service_window { 'apache-stop':
  ensure => stopped,
  service_name => 'apache',
}

package { 'new-app':
  ensure => installed,
  require => Service_Window['apache-stop'],
  before => Service_Window['apache-start'],
}

service_window { 'apache-start':
  ensure => started,
  service_name => 'apache',
}