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>

1 files changed, 106 insertions, 0 deletions

diff --git a/docs/drools/feature_testtransaction.rst b/docs/drools/feature_testtransaction.rst
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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