From 758ed5f1bc16f4b73d73d94129761a8680fd71c5 Mon Sep 17 00:00:00 2001 From: Erik Johnston Date: Thu, 21 Jan 2021 17:00:12 +0000 Subject: Speed up chain cover calculation (#9176) --- synapse/storage/util/sequence.py | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'synapse/storage/util') diff --git a/synapse/storage/util/sequence.py b/synapse/storage/util/sequence.py index c780ade077..0ec4dc2918 100644 --- a/synapse/storage/util/sequence.py +++ b/synapse/storage/util/sequence.py @@ -69,6 +69,11 @@ class SequenceGenerator(metaclass=abc.ABCMeta): """Gets the next ID in the sequence""" ... + @abc.abstractmethod + def get_next_mult_txn(self, txn: Cursor, n: int) -> List[int]: + """Get the next `n` IDs in the sequence""" + ... + @abc.abstractmethod def check_consistency( self, @@ -219,6 +224,17 @@ class LocalSequenceGenerator(SequenceGenerator): self._current_max_id += 1 return self._current_max_id + def get_next_mult_txn(self, txn: Cursor, n: int) -> List[int]: + with self._lock: + if self._current_max_id is None: + assert self._callback is not None + self._current_max_id = self._callback(txn) + self._callback = None + + first_id = self._current_max_id + 1 + self._current_max_id += n + return [first_id + i for i in range(n)] + def check_consistency( self, db_conn: Connection, -- cgit 1.5.1