code: def MultiReadClientSnapshot(self, client_ids):
      
      res = {}
      for client_id in client_ids:
        history = self.clients.get(client_id, None)
        if not history:
          res[client_id] = None
          continue
        last_timestamp = max(history)
        last_serialized = history[last_timestamp]
        client_obj = rdf_objects.ClientSnapshot.FromSerializedString(
            last_serialized)
        client_obj.timestamp = last_timestamp
        client_obj.startup_info = rdf_client.StartupInfo.FromSerializedString(
            self.startup_history[client_id][last_timestamp])
        res[client_id] = client_obj
      return res
docs: Reads the latest client snapshots for a list of clients.