def __init__(self, log=log):
self.log = log
self._zclient = ZeitgeistClient()
self._zdclient = ZeitgeistDBusInterface()
self._database = DesktopDatabase(DATABASE_NAME, create=True)
self._user = os.environ.get('USERNAME')
self._machine = os.uname()
def on_db_change(self, callback=None, dbname=DATABASE_NAME, every=2):
'''
Set some function to be called when db entry content changed
Call this function with callback=False to remove change watch
The callback will be called with same keyworkd that in _changes
Consult _changes for more info
http://wiki.apache.org/couchdb/HTTP_database_API#Continuous_.28Nohangeshangesn-Polling.29_Feed
Examples:
Insert or Update case
>>> callback(**{
>>> "seq":331,
>>> "id":"<_id of document entry>",
>>> "changes":[{"rev":"<_rev of document entry>"}]
>>> })
Delete case
>>> callback(**{
>>> "seq":334,
>>> "id":"<_id of document entry>",
>>> "changes":[{"rev":"<_rev of document entry>"}],
>>> "deleted":True
>>> })
callback: callable, called with changes
dbname: name of database do watch
every: time in seconds, how many seconds to wait and rescan for changes
'''
db = self._databases.get(dbname)
if db:
gobject.source_remove(db['onchangeeventid'])
else:
self._databases[dbname] = db = {
'dbinstance': self._database if dbname is DATABASE_NAME\
else DesktopDatabase(dbname)
}
def watch_changes():
db['dbinstance'].report_changes(callback)
db['onchangeeventid'] = \
gobject.timeout_add_seconds(every, watch_changes)
if callback:
watch_changes()
