def __init__(self, handler, db, rootfs=None):
self._db = db
self._changed = []
db.medialist.connect(self)
self.hwmon = HardwareMonitor(handler, db, rootfs)
class Controller(object):
"""
The controller defines the callbacks Item and Media need. On client
side this is all implemented in the Client class.
"""
def __init__(self, handler, db, rootfs=None):
self._db = db
self._changed = []
db.medialist.connect(self)
self.hwmon = HardwareMonitor(handler, db, rootfs)
def _beacon_parse(self, item):
"""
Parse an item
Called by Item objects
"""
return parse(self._db, item)
@kaa.coroutine()
def _beacon_update_all(self):
"""
Timed callback to write all changes to the db.
Called by Item objects
"""
yield kaa.inprogress(self._db.read_lock)
changes = self._changed
self._changed = []
for item in changes:
self._db.update_object(item._beacon_id, item._beacon_changes)
item._beacon_changes = {}
# commit to update monitors
self._db.commit()
def _beacon_update(self, item):
"""
Mark item as changed to be updated in the db.
Called by Item objects
"""
if not self._changed:
# register timer to do the changes
kaa.OneShotTimer(self._beacon_update_all).start(0.1)
self._changed.append(item)
def query(self, **query):
"""
Database query.
Called by Item objects
"""
return self._db.query(**query)
@kaa.coroutine()
def delete_item(self, item):
"""
Delete an item.
Called by Item objects
"""
yield kaa.inprogress(self._db.read_lock)
self._db.delete_object(item._beacon_id)
def eject(self, media):
"""
Eject media
Called by Media objects
"""
self.hwmon.eject(media)
def _beacon_media_information(self, media):
"""
Get media information from the database.
Called by Media objects
"""
return self._db.query_media(media)