title: Ansible notify handlers in another role
body: <p>Can I notify the handler in another role?  What should I do to make ansible find it?</p>
  
  <p>The use case is, e.g. I want to configure some service and then restart it if changed.  Different OS have probably different files to edit and even the file format can be different.  So I would like to put them into different roles (because the file format can be different, it can't be done by setting group_vars).  But the way to restart the service is the same, using <code>service</code> module; so I'd like to put the handler to <code>common</code> role.</p>
  
  <p>Is anyway to achieve this?  Thanks.</p>