Relied on very basic rule class

data/instance-b/instance.py

@@ -19,10 +19,8 @@
 import logging
 import sys
 
-# pylint: disable=import-error
-from rabotnik import Rabotnik, Task
-
-table_name = "test_table"
+from rabotnik import Rabotnik  # pylint: disable=import-error
+from rules.building_demo import BuildingDemo  # pylint: disable=import-error
 
 logger = logging.getLogger()
 logger.setLevel(logging.DEBUG)
@@ -39,22 +37,8 @@ def building(building_id):
     The payload is the *building_id*
     """
 
-    # At this point, the user can start her/hi processing routines.
-
-    # In this example we will be executing a set of rules that process
-    # data returned by a database query.
-
-    # A new celery task could be spawned for that:
-    recalculate_building_demo.apply_async(kwargs=dict(building_id=building_id))
-
-
-@rabotnik.processor.task(name="recalculate_building_demo", base=Task)
-def recalculate_building_demo(building_id):
-    """A database task has access to the local database instance."""
-
-    db = recalculate_building_demo.database
-    for row in db.get_results("select * from %s" % table_name):
-        logger.info("data: %s" % str(row))
+    rules = [BuildingDemo(rabotnik.storage)]
+    rules[0].evaluate(building_id)
 
 
 # Celery needs an exposed "app"

data/instance-b/rules/__init__.py

+#!/usr/bin/env python3
+
+# Copyright (c) 2020-2021:
+#  Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum GFZ
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or (at
+# your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero
+# General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see http://www.gnu.org/licenses/.

data/instance-b/rules/building_demo.py

+#!/usr/bin/env python3
+
+# Copyright (c) 2020-2021:
+#  Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum GFZ
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or (at
+# your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero
+# General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see http://www.gnu.org/licenses/.
+
+import logging
+
+from rabotnik import Rule  # pylint: disable=import-error
+
+logger = logging.getLogger()
+
+
+class BuildingDemo(Rule):
+    def __init__(self, db):
+        self.db = db
+
+    def evaluate(self, id: int):
+        """A simple demo rule accessing a local database."""
+
+        for row in self.db.get_results("select * from test_table"):
+            logger.info("data: %s" % str(row))