gistfile1.scala

  case AddRegistryLink(link) => 
     if(!linkedRegistries.containsKey(link))
        addRegistryLink(link)
     else
        log.debug("Link to registry [%s] is already present" format(link))
     
      
  case RemoveRegistryLink(link) => {
     log.debug("Unlinking from registry [%s]" format(link))
     linkedRegistries.remove(link)
  }

  ...

  /**
   * Adds link to remote registry, and register all local actors at there
   */
  protected def addRegistryLink(link: RegistryLink) = {
    log.debug("Adding link to remote registry [%s]" format(link))
    val remoteRegistry = RemoteClient.actorFor(link.name.toString, link.host, link.port)
    log.debug("Letting remote registry know about the other linked registries...")
    val iterator = linkedRegistries.keySet.iterator
    while(iterator.hasNext) remoteRegistry ! iterator.next
    remoteRegistry ! AddRegistryLink(RegistryLink())
    linkedRegistries.put(link, remoteRegistry)
  }