diff --git a/synapse/handlers/read_marker.py b/synapse/handlers/read_marker.py
new file mode 100644
index 0000000000..77164f3f49
--- /dev/null
+++ b/synapse/handlers/read_marker.py
@@ -0,0 +1,82 @@
+# -*- coding: utf-8 -*-
+# Copyright 2015, 2016 OpenMarket Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from ._base import BaseHandler
+
+from twisted.internet import defer
+
+from synapse.util.logcontext import PreserveLoggingContext
+from synapse.types import get_domain_from_id
+
+import logging
+
+
+logger = logging.getLogger(__name__)
+
+
+class ReadMarkerHandler(BaseHandler):
+ def __init__(self, hs):
+ super(ReadMarkerHandler, self).__init__(hs)
+
+ self.server_name = hs.config.server_name
+ self.store = hs.get_datastore()
+
+ @defer.inlineCallbacks
+ def received_client_read_marker(self, room_id, user_id, event_id):
+ """NEEDS DOC
+ """
+
+ room_id = read_marker["room_id"]
+ user_id = read_marker["user_id"]
+ event_id = read_marker["event_id"]
+
+ # Get ordering for existing read marker
+ account_data = yield self.store.get_account_data_for_room(user_id, room_id)
+ existing_read_marker = account_data["m.read_marker"]
+
+ if existing_read_marker:
+ # Get ordering for new read marker
+ res = self.store._simple_select_one_txn(
+ txn,
+ table="events",
+ retcols=["topological_ordering", "stream_ordering"],
+ keyvalues={"event_id": event_id},
+ allow_none=True
+ )
+ new_to = int(res["topological_ordering"]) if res else None
+ new_so = int(res["stream_ordering"]) if res else None
+
+ res = self.store._simple_select_one_txn(
+ txn,
+ table="events",
+ retcols=["topological_ordering", "stream_ordering"],
+ keyvalues={"event_id": existing_read_marker.content.marker},
+ allow_none=True
+ )
+ existing_to = int(res["topological_ordering"]) if res else None
+ existing_so = int(res["stream_ordering"]) if res else None
+
+ if new_to > existing_to:
+ return False
+ elif new_to == existing_to and new_so >= existing_so:
+ return False
+
+ # Update account data
+ content = {
+ "marker": event_id
+ }
+ yield self.store.add_account_data_to_room(
+ user_id, room_id, "m.read_marker", content
+ )
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