Begin adding implementing room chunks

This commit adds the necessary tables and columns, as well as an
implementation of an online topological sorting algorithm to maintain an
absolute ordering of the room chunks.

1 files changed, 58 insertions, 0 deletions

diff --git a/tests/util/test_katriel_bodlaender.py b/tests/util/test_katriel_bodlaender.py
new file mode 100644
index 0000000000..5768408604
--- /dev/null
+++ b/tests/util/test_katriel_bodlaender.py
@@ -0,0 +1,58 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018 New Vector 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 synapse.util.katriel_bodlaender import InMemoryOrderedListStore
+
+from tests import unittest
+
+
+class KatrielBodlaenderTests(unittest.TestCase):
+    def test_simple_graph(self):
+        store = InMemoryOrderedListStore()
+
+        nodes = [
+            "node_1",
+            "node_2",
+            "node_3",
+            "node_4",
+        ]
+
+        for node in nodes:
+            store.add_node(node)
+
+        store.add_edge("node_2", "node_3")
+        store.add_edge("node_1", "node_2")
+        store.add_edge("node_3", "node_4")
+
+        self.assertEqual(nodes, store.list)
+
+    def test_reverse_graph(self):
+        store = InMemoryOrderedListStore()
+
+        nodes = [
+            "node_1",
+            "node_2",
+            "node_3",
+            "node_4",
+        ]
+
+        for node in nodes:
+            store.add_node(node)
+
+        store.add_edge("node_3", "node_2")
+        store.add_edge("node_2", "node_1")
+        store.add_edge("node_4", "node_3")
+
+        self.assertEqual(list(reversed(nodes)), store.list)