Add common base weigher/weigher handler for filter scheduler

Filter scheduler is being used for more than one core projects (Nova
and Cinder as of writing), the implementation shared a lot of common
code. This patch is to move base weigher (weighing function), weigher
handler for filter scheduler into oslo to reduce possible porting.

implement bp: common-weights

Change-Id: I2d1b37438663b53e035cc262875a283e5e2ee970

2 files changed, 67 insertions, 0 deletions

diff --git a/tests/unit/fakes.py b/tests/unit/fakes.py
new file mode 100644
index 0000000..81fc503
--- /dev/null
+++ b/tests/unit/fakes.py
@@ -0,0 +1,35 @@
+# Copyright 2012 Intel Inc, OpenStack LLC.
+# All Rights Reserved.
+#
+#    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.
+"""
+Fakes For filter and weight tests.
+"""
+
+
+from openstack.common.scheduler import weights
+
+
+class FakeWeigher1(weights.BaseHostWeigher):
+    def __init__(self):
+        pass
+
+
+class FakeWeigher2(weights.BaseHostWeigher):
+    def __init__(self):
+        pass
+
+
+class FakeClass(object):
+    def __init__(self):
+        pass
diff --git a/tests/unit/scheduler/test_weights.py b/tests/unit/scheduler/test_weights.py
new file mode 100644
index 0000000..478a143
--- /dev/null
+++ b/tests/unit/scheduler/test_weights.py
@@ -0,0 +1,32 @@
+# Copyright 2011-2012 OpenStack LLC.
+# All Rights Reserved.
+#
+#    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.
+"""
+Tests For Scheduler weights.
+"""
+
+import unittest
+
+from openstack.common.scheduler import weight
+from tests.unit import fakes
+
+
+class TestWeightHandler(unittest.TestCase):
+    def test_get_all_classes(self):
+        namespace = "openstack.common.tests.fakes.weights"
+        handler = weight.BaseWeightHandler(weight.BaseWeigher, namespace)
+        classes = handler.get_all_classes()
+        self.assertTrue(fakes.FakeWeigher1 in classes)
+        self.assertTrue(fakes.FakeWeigher2 in classes)
+        self.assertFalse(fakes.FakeClass in classes)