Address sonar issues in drools-pdp

Addressed the following sonar issues:
- add "final" to public static fields
- commented code; some were bogus - just updated the comments
  so sonar is happy
- use "{}" instead of string concatenation
- junit should assert something
- when using logger, invoke compute-intensive tasks conditionally
- use superclass name instead of subclass name to access static fields
- don't always return the same value
- remove "transient" from fields of classes that aren't Serializable
- don't nest try/catch blocks
- use appropriate class name in Logger.getLogger()
- use Predicate<T> instead of Function<T,Boolean>
- remove unused parameters from private methods
- either log or throw
- remove duplicate methods
- use remove() TLS instead of set(null)
- null check is implicit in instanceof check
- do something with return value
- don't use volatile
- don't return "null" list; used Optional instead
- add no-arg constructor to non-Serializable superclass
- add callSuper=true for EqualsAndHashCode
- don't declare "throws XXX" where XXX is a subclass of RuntimeException
- remove serialVersionUID field if the class isn't Serializable

Also addressed some eclipse warnings:
- unused fields
- suppress generic typic cast warnings

Issue-ID: POLICY-2305
Change-Id: I906d5bf71c1f86531423e23b3667a585cdba45e1
Signed-off-by: Jim Hahn <jrh3@att.com>

4 files changed, 24 insertions, 19 deletions

diff --git a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ActiveStandbyFeature.java b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ActiveStandbyFeature.java
index 91d30d74..2b75ea5e 100644
--- a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ActiveStandbyFeature.java
+++ b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/ActiveStandbyFeature.java
@@ -2,7 +2,7 @@
  * ============LICENSE_START=======================================================
  * feature-active-standby-management
  * ================================================================================
- * Copyright (C) 2017-2019 AT&T Intellectual Property. All rights reserved.
+ * Copyright (C) 2017-2020 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.
@@ -151,10 +151,8 @@ public class ActiveStandbyFeature implements ActiveStandbyFeatureApi,
          */
         DroolsPdp existingPdp = conn.getPdp(resourceName);
         if (existingPdp != null) {
-            logger.info("Found existing PDP record, pdpId="
-                    + existingPdp.getPdpId() + ", isDesignated="
-                    + existingPdp.isDesignated() + ", updatedDate="
-                    + existingPdp.getUpdatedDate());
+            logger.info("Found existing PDP record, pdpId={} isDesignated={}, updatedDate={}",
+                     existingPdp.getPdpId(), existingPdp.isDesignated(), existingPdp.getUpdatedDate());
             myPdp = existingPdp;
         }
 
diff --git a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpsElectionHandler.java b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpsElectionHandler.java
index 37382e81..f51e0718 100644
--- a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpsElectionHandler.java
+++ b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/DroolsPdpsElectionHandler.java
@@ -2,7 +2,7 @@
  * ============LICENSE_START=======================================================
  * feature-active-standby-management
  * ================================================================================
- * Copyright (C) 2017-2019 AT&T Intellectual Property. All rights reserved.
+ * Copyright (C) 2017-2020 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.
@@ -92,7 +92,7 @@ public class DroolsPdpsElectionHandler implements ThreadRunningChecker {
         pdpdNowActive = null;
         pdpdLastActive = null;
         this.pdpsConnector = pdps;
-        DroolsPdpsElectionHandler.myPdp = myPdp;
+        setMyPdp(myPdp);
         this.isDesignated = false;
 
         // The interval between checks of the DesignationWaiter to be sure it is running.
@@ -152,6 +152,10 @@ public class DroolsPdpsElectionHandler implements ThreadRunningChecker {
         }
     }
 
+    private static void setMyPdp(DroolsPdp myPdp) {
+        DroolsPdpsElectionHandler.myPdp = myPdp;
+    }
+
     public static void setIsUnitTesting(boolean val) {
         isUnitTesting = val;
     }
@@ -403,9 +407,11 @@ public class DroolsPdpsElectionHandler implements ThreadRunningChecker {
         }
 
         private void demoteMyPdp(DroolsPdp pdp, String standbyStatus) throws Exception {
-            //Keep the order like this.  StateManagement is last since it
-            //triggers controller shutdown
-            //This will change isDesignated and it can enter another if(combination) below
+            /*
+             * Keep the order like this. StateManagement is last since it triggers
+             * controller shutdown. This will change isDesignated and it can enter another
+             * if-combination below
+             */
             pdpsConnector.standDownPdp(pdp.getPdpId());
             myPdp.setDesignated(false);
             isDesignated = false;
@@ -422,8 +428,8 @@ public class DroolsPdpsElectionHandler implements ThreadRunningChecker {
 
         private void pdpDesignatedNotCurrent(DroolsPdp pdp) {
             /*
-             * Changes designated to 0 but it is still potentially providing service
-             * Will affect isDesignated, so, it can enter an if(combination) below
+             * Changes designated to 0 but it is still potentially providing service.
+             * Will affect isDesignated, so, it can enter an if-combination below
              */
             pdpsConnector.standDownPdp(pdp.getPdpId());
 
@@ -614,7 +620,7 @@ public class DroolsPdpsElectionHandler implements ThreadRunningChecker {
             }
             waitTimerLastRunDate = currentTime.getDate();
             logger.debug("DesignatedWaiter.run (designatedPdp.getPdpId().equals(myPdp.getPdpId())) "
-                            + "waitTimerLastRunDate = " + waitTimerLastRunDate);
+                            + "waitTimerLastRunDate = {}", waitTimerLastRunDate);
             myPdp.setUpdatedDate(waitTimerLastRunDate);
             pdpsConnector.update(myPdp);
         }
@@ -786,7 +792,7 @@ public class DroolsPdpsElectionHandler implements ThreadRunningChecker {
                 // So, we must demote it
                 demoteMyPdp();
             }
-        } //end: for(DroolsPdp pdp : listOfDesignated)
+        }
 
         DroolsPdp lowestPriorityPdp = data.getLowestPriority();
 
diff --git a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/JpaDroolsPdpsConnector.java b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/JpaDroolsPdpsConnector.java
index 1830d055..6e456962 100644
--- a/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/JpaDroolsPdpsConnector.java
+++ b/feature-active-standby-management/src/main/java/org/onap/policy/drools/activestandby/JpaDroolsPdpsConnector.java
@@ -2,7 +2,7 @@
  * ============LICENSE_START=======================================================
  * feature-active-standby-management
  * ================================================================================
- * Copyright (C) 2017-2019 AT&T Intellectual Property. All rights reserved.
+ * Copyright (C) 2017-2020 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.
@@ -566,7 +566,7 @@ public class JpaDroolsPdpsConnector implements DroolsPdpsConnector {
                 try {
                     em.getTransaction().rollback();
                 } catch (Exception e) {
-                    logger.error(method + ": Caught Exception attempting to rollback EntityTransaction,", e);
+                    logger.error("{}: Caught Exception attempting to rollback EntityTransaction", method, e);
                 }
             }
 
@@ -574,7 +574,7 @@ public class JpaDroolsPdpsConnector implements DroolsPdpsConnector {
             try {
                 em.close();
             } catch (Exception e) {
-                logger.error(method + ": Caught Exception attempting to close EntityManager, ", e);
+                logger.error("{}: Caught Exception attempting to close EntityManager", method, e);
             }
         }
     }
diff --git a/feature-active-standby-management/src/test/java/org/onap/policy/drools/activestandby/PmStandbyStateChangeNotifierTest.java b/feature-active-standby-management/src/test/java/org/onap/policy/drools/activestandby/PmStandbyStateChangeNotifierTest.java
index 4a89d257..1cf20e21 100644
--- a/feature-active-standby-management/src/test/java/org/onap/policy/drools/activestandby/PmStandbyStateChangeNotifierTest.java
+++ b/feature-active-standby-management/src/test/java/org/onap/policy/drools/activestandby/PmStandbyStateChangeNotifierTest.java
@@ -2,7 +2,7 @@
  * ============LICENSE_START=======================================================
  * ONAP
  * ================================================================================
- * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * Copyright (C) 2019-2020 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.
@@ -20,6 +20,7 @@
 
 package org.onap.policy.drools.activestandby;
 
+import static org.assertj.core.api.Assertions.assertThatCode;
 import static org.junit.Assert.assertEquals;
 import static org.mockito.Matchers.any;
 import static org.mockito.Matchers.eq;
@@ -263,7 +264,7 @@ public class PmStandbyStateChangeNotifierTest {
     @Test
     public void testGetPolicyEngineManager() {
         // use real object with real method - no exception expected
-        new PmStandbyStateChangeNotifier().getPolicyEngineManager();
+        assertThatCode(() -> new PmStandbyStateChangeNotifier().getPolicyEngineManager()).doesNotThrowAnyException();
     }
 
     private class MyNotifier extends PmStandbyStateChangeNotifier {