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authorSaryu Shah <ss3917@att.com>2019-06-03 16:23:04 +0000
committerSaryu Shah <ss3917@att.com>2019-06-03 16:27:51 +0000
commitf96ef833d3b00f84639b712579d6e2824e6063b4 (patch)
tree7bd13b47fb88e8b4859e55ad5c8629cebd7eadcd /docs/drools/feature_testtransaction.rst
parent1000b605908e4ff18e5a077026d5eadbc0ae46d8 (diff)
Create Drools PDP documentation - features
Create Drools PDP documentation in parent - features Change-Id: Ie710842a7921fd46ffdef4628d50637093111cc8 Issue-ID: POLICY-1678 Signed-off-by: Saryu Shah <ss3917@att.com>
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+
+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+*************************
+Feature: Test Transaction
+*************************
+
+.. contents::
+ :depth: 3
+
+Summary
+^^^^^^^
+
+The Test Transaction feature provides a mechanism by which the health of drools policy controllers can be tested.
+
+When enabled, the feature functions by injecting an event object (identified by a UUID) into the drools session of each policy controller that is active in the system. Only an object with this UUID can trigger the Test Transaction-specific drools logic to execute.
+
+The injection of the event triggers the "TT" rule (see *TestTransactionTemplate.drl* below) to fire. The "TT" rule simply increments a ForwardProgress counter object, thereby confirming that the drools session for this particular controller is active and firing its rules accordingly. This cycle repeats at 20 second intervals.
+
+If it is ever the case that a drools controller does not have the "TT" rule present in its *.drl*, or that the forward progress counter is not incremented, the Test Transaction thread for that particular drools session (i.e. controller) is terminated and a message is logged to *error.log*.
+
+Usage
+^^^^^
+
+Prior to being enabled, the following drools rules need to be appended to the rules templates of any use-case that is to be monitored by the feature.
+
+ .. code-block:: java
+ :caption: TestTransactionTemplate.drl
+ :linenos:
+
+ /*
+ * ============LICENSE_START=======================================================
+ * feature-test-transaction
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+ package org.onap.policy.drools.rules;
+
+ import java.util.EventObject;
+
+ declare ForwardProgress
+ counter : Long
+ end
+
+ rule "TT.SETUP"
+ when
+ then
+ ForwardProgress fp = new ForwardProgress();
+ fp.setCounter(0L);
+ insert(fp);
+ end
+
+ rule "TT"
+ when
+ $fp : ForwardProgress()
+ $tt : EventObject(source == "43868e59-d1f3-43c2-bd6f-86f89a61eea5")
+ then
+ $fp.setCounter($fp.getCounter() + 1);
+ retract($tt);
+ end
+ query "TT.FPC"
+ ForwardProgress(counter >= 0, $ttc : counter)
+ end
+
+Once the proper artifacts are built and deployed with the addition of the TestTransactionTemplate rules, the feature can then be enabled by entering the following commands:
+
+ .. code-block:: bash
+ :caption: PDPD Features Command
+
+ policy@hyperion-4:/opt/app/policy$ policy stop
+ [drools-pdp-controllers]
+ L []: Stopping Policy Management... Policy Management (pid=354) is stopping... Policy Management has stopped.
+ policy@hyperion-4:/opt/app/policy$ features enable test-transaction
+ name version status
+ ---- ------- ------
+ controlloop-utils 1.1.0-SNAPSHOT disabled
+ healthcheck 1.1.0-SNAPSHOT disabled
+ test-transaction 1.1.0-SNAPSHOT enabled
+ eelf 1.1.0-SNAPSHOT disabled
+ state-management 1.1.0-SNAPSHOT disabled
+ active-standby-management 1.1.0-SNAPSHOT disabled
+ session-persistence 1.1.0-SNAPSHOT disabled
+
+The output of the enable command will indicate whether or not the feature was enabled successfully.
+
+Policy engine can then be started as usual.
+
+
+End of Document
+
+.. SSNote: Wiki page ref. https://wiki.onap.org/display/DW/Feature+Test+Transaction