def reload_glance(self, target_app, slices=None):
glance = AppGlance(<EOL>version=<NUM_LIT:1>,<EOL>creation_time=time.time(),<EOL>slices=(slices or [])<EOL>)<EOL>SyncWrapper(self._blobdb.insert, BlobDatabaseID.AppGlance, target_app, glance.serialise()).wait()<EOL>
Reloads an app's glance. Blocks as long as necessary.

:param target_app: The UUID of the app for which to reload its glance.
:type target_app: ~uuid.UUID
:param slices: The slices with which to reload the app's glance.
:type slices: list[.AppGlanceSlice]