20     We'll check if the label already exists on the host and return True if so.
21     Otherwise we'll check if the label should exist on the host.
25     def exists_wrapper(self, host):  argument
30         @param host: The host object to run methods on.
32         @returns True if the label already exists on the host, otherwise run
35         info = host.host_info_store.get()
36         return (self._NAME in info.labels) or exists(self, host)
42     This class contains the scaffolding for the host-specific labels.
50     def generate_labels(self, host):  argument
52         Return the list of labels generated for the host.
54         @param host: The host object to check on.  Not needed here for base case
57         @return a list of labels applicable to the host.
62     def exists(self, host):  argument
64         Checks the host if the label is applicable or not.
66         This method is geared for the type of labels that indicate if the host
69         host or not.
71         @param host: The host object to check on.
76     def get(self, host):  argument
80         @param host: The host object to check on.
82         if self.exists(host):
83             return self.generate_labels(host)
139     def generate_labels(self, host):  argument
143     def exists(self, host):  argument
153     present and indicate the os/board/etc type of the host.  The _NAME property
164     def get(self, host):  argument
167         @param host: The host object to check on.
169         if self.exists(host):
171                     for label in self.generate_labels(host)]
194     """This class will assist in retrieving/updating the host labels."""
214     def get_labels(self, host):  argument
216         Retrieve the labels for the host.
218         @param host: The host to get the labels for.
224                 labels.extend(label.get(host))
231     def get_labels_for_update(self, host, task_name):  argument
233         Retrieve the labels for the host which needs to be updated.
235         @param host: The host to get the labels for updating.
247                     labels.extend(label.get(host))
271         want to keep but won't be part of the new labels detected on the host.
276         @param old_labels: List of labels already on the host.
287     def _commit_info(self, host, new_info, keep_pool):  argument
288         if keep_pool and isinstance(host.host_info_store,
290             primary_store = afe_store.AfeStoreKeepPool(host.hostname)
291             host.host_info_store.commit_with_substitute(
297         host.host_info_store.commit(new_info)
300     def update_labels(self, host, task_name='', keep_pool=False):  argument
302         Retrieve the labels from the host and update if needed.
304         @param host: The host to update the labels for.
313         new_labels = self.get_labels_for_update(host, task_name)
314         old_info = host.host_info_store.get()
322             self._commit_info(host, new_info, keep_pool)