def __init__(self, connection, callback):
log.Logger.__init__(self, connection)
assert callable(callback), type(callback)
self.connection = IRevisionStore(connection)
self._callback = callback
self._buffer = list()
class RevisionAnalytic(log.Logger):
'''
The point of this class is to analyze if the document change notification
has been caused the same or different database connection. It wraps around
a callback and adds the own_change flag parameter.
It uses private interface of Connection to get the information of the
known revisions.
'''
def __init__(self, connection, callback):
log.Logger.__init__(self, connection)
assert callable(callback), type(callback)
self.connection = IRevisionStore(connection)
self._callback = callback
self._buffer = list()
def on_change(self, doc_id, rev, deleted):
self.log('Change notification received doc_id: %r, rev: %r, '
'deleted: %r', doc_id, rev, deleted)
if self.connection.analyzes_locked:
self.connection.wait_unlocked(self.unlocked)
self._buffer.append((doc_id, rev, deleted))
else:
self.process_change(doc_id, rev, deleted)
def unlocked(self):
while len(self._buffer) > 0:
self.process_change(*self._buffer.pop(0))
def process_change(self, doc_id, rev, deleted):
own_change = False
if doc_id in self.connection.known_revisions:
rev_index, rev_hash = _parse_doc_revision(rev)
last_index, last_hash = self.connection.known_revisions[doc_id]
if last_index > rev_index:
own_change = True
if (last_index == rev_index) and (last_hash == rev_hash):
own_change = True
self._callback(doc_id, rev, deleted, own_change)
