Fix sonar issues in drools-pdp

Address sonar issue, "Move constants to a class or enum", by moving them from interfaces to classes: ActiveStandbyFeatureApi StateManagementFeatureApi PolicyResourceLockFeatureApi PolicySessionFeatureApi DroolsController DroolsControllerFeatureApi PolicyControllerFeatureApi PolicyEngineFeatureApi HealthCheck SystemPersistence EventProtocolCoder PolicyController PolicyEngine TestTransaction MdcTransaction Address sonar issue, "Move constants to a class or enum", by change the interface to a class: DroolsProperties Address sonar issue, "Override the "equals" method in this class", by adding equals & hashCode to: DroolsPdpEntity DroolsPdpImpl Use lombok for a number of getters & setters. Address sonar issue, "Define a constant instead of duplicating this literal" in: DroolsPdpsElectionHandler JpaDroolsPdpsConnector MavenDroolsController GenericEventProtocolCoder GsonProtocolCoderToolset RestManager Address sonar issue, "Remove the parentheses around the parameter" in: MavenDroolsController Address sonar issue, "Replace this lambda with a method reference" in: LifecycleFsm Address sonar issue, "Move this constructor to comply with Java Code Conventions" in: LifecycleStateRunning Address sonar issue, "Replace this 'switch' statement by 'if' statements to increase readability", as specified in: PolicyEngineManager Address sonar issue, "Rename field to prevent any misunderstanding/clash with field" in: MdcTransactionImpl Address sonar issue, "Either log or rethrow this exception", in: RestManager Address sonar issue, "Rename this constant name to" uppercase, by replacing enums with static lists in: RestManager Addressed review comments: Fixed license dates. Renamed getSiteName/setSiteName methods to getSite/setSite in the interface to match the field names in the implementation classes. Renamed *Instance classes to *Constants. Next round of review comments. Change-Id: I1c26af9f194833dd773f2b25dc5f60cde163201c Issue-ID: POLICY-1968 Signed-off-by: Jim Hahn <jrh3@att.com>
author: Jim Hahn <jrh3@att.com> 2019-08-05 15:27:16 -0400
committer: Jim Hahn <jrh3@att.com> 2019-08-13 15:58:15 -0400
commit: a156cf3cbad6512510ae9a02a13c0408f901c734 (patch)
tree: 0a69bffb2a6c9f961bda1408153cf44f360c6a17 /policy-management/src/main/java/org/onap
parent: 62d1ff054b0ec6348ab6f7415063fdaa3f425215 (diff)
28 files changed, 750 insertions, 429 deletions
diff --git a/policy-management/src/main/java/org/onap/policy/drools/controller/DroolsController.java b/policy-management/src/main/java/org/onap/policy/drools/controller/DroolsController.java
index 4347614f..dd654b1d 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/controller/DroolsController.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/controller/DroolsController.java
@@ -7,9 +7,9 @@
  * 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.
@@ -35,56 +35,36 @@ import org.onap.policy.drools.protocol.coders.TopicCoderFilterConfiguration;
 public interface DroolsController extends Startable, Lockable {
 
     /**
-     * No Group ID identifier.
-     */
-    String NO_GROUP_ID = "NO-GROUP-ID";
-
-    /**
-     * No Artifact ID identifier.
-     */
-    String NO_ARTIFACT_ID = "NO-ARTIFACT-ID";
-
-    /**
-     * No version identifier.
-     */
-    String NO_VERSION = "NO-VERSION";
-
-    /**
-     * Factory to track and manage drools controllers.
-     */
-    DroolsControllerFactory factory = new IndexedDroolsControllerFactory();
-
-    /**
      * get group id.
-     * 
+     *
      * @return group id
      */
     String getGroupId();
 
     /**
      * get artifact id.
-     * 
+     *
      * @return artifact id
      */
     String getArtifactId();
 
     /**
      * get version.
-     * 
+     *
      * @return version
      */
     String getVersion();
 
     /**
      * return the policy session names.
-     * 
+     *
      * @return policy session
      */
     List<String> getSessionNames();
 
     /**
      * return the policy full session names.
-     * 
+     *
      * @return policy session
      */
     List<String> getCanonicalSessionNames();
@@ -98,10 +78,10 @@ public interface DroolsController extends Startable, Lockable {
 
     /**
      * offers a raw event to this controller for processing.
-     * 
+     *
      * @param topic topic associated with the event
      * @param event the event
-     * 
+     *
      * @return true if the operation was successful
      */
     boolean offer(String topic, String event);
@@ -117,7 +97,7 @@ public interface DroolsController extends Startable, Lockable {
 
     /**
      * delivers "event" to "sink".
-     * 
+     *
      * @param sink destination
      * @param event event
      * @return true if successful, false if a failure has occurred.
@@ -131,28 +111,28 @@ public interface DroolsController extends Startable, Lockable {
 
     /**
      * Get recent source events.
-     * 
+     *
      * @return the most recent received events.
      */
     Object[] getRecentSourceEvents();
 
     /**
      * Get recent sink events.
-     * 
+     *
      * @return the most recent delivered events
      */
     String[] getRecentSinkEvents();
 
     /**
      * Get container.
-     * 
+     *
      * @return the underlying policy container
      */
     PolicyContainer getContainer();
 
     /**
      * Does it owns the coder.
-     * 
+     *
      * @param coderClass the encoder object
      * @param modelHash the hash for the model
      * @return true it owns it
@@ -161,7 +141,7 @@ public interface DroolsController extends Startable, Lockable {
 
     /**
      * fetches a class from the model.
-     * 
+     *
      * @param className the class to fetch
      * @return the actual class object, or null if not found
      */
@@ -174,13 +154,13 @@ public interface DroolsController extends Startable, Lockable {
 
     /**
      * update the new version of the maven jar rules file.
-     * 
+     *
      * @param newGroupId - new group id
      * @param newArtifactId - new artifact id
      * @param newVersion - new version
      * @param decoderConfigurations - decoder configurations
      * @param encoderConfigurations - encoder configurations
-     * 
+     *
      * @throws Exception from within drools libraries
      * @throws LinkageError from within drools libraries
      */
@@ -190,7 +170,7 @@ public interface DroolsController extends Startable, Lockable {
 
     /**
      * gets the classnames of facts as well as the current count.
-     * 
+     *
      * @param sessionName the session name
      * @return map of class to count
      */
@@ -198,7 +178,7 @@ public interface DroolsController extends Startable, Lockable {
 
     /**
      * gets the count of facts for a given session.
-     * 
+     *
      * @param sessionName the session name
      * @return the fact count
      */
@@ -206,7 +186,7 @@ public interface DroolsController extends Startable, Lockable {
 
     /**
      * gets all the facts of a given class for a given session.
-     * 
+     *
      * @param sessionName the session identifier
      * @param className the class type
      * @param delete retract from drools the results of the query?
@@ -221,7 +201,7 @@ public interface DroolsController extends Startable, Lockable {
 
     /**
      * gets the facts associated with a query for a give session for a given queried entity.
-     * 
+     *
      * @param sessionName the session
      * @param queryName the query identifier
      * @param queriedEntity the queried entity
@@ -254,7 +234,7 @@ public interface DroolsController extends Startable, Lockable {
 
     /**
      * halts and permanently releases all resources.
-     * 
+     *
      */
     void halt();
 }
diff --git a/policy-management/src/main/java/org/onap/policy/drools/controller/DroolsControllerConstants.java b/policy-management/src/main/java/org/onap/policy/drools/controller/DroolsControllerConstants.java
new file mode 100644
index 00000000..16cf3592
--- /dev/null
+++ b/policy-management/src/main/java/org/onap/policy/drools/controller/DroolsControllerConstants.java
@@ -0,0 +1,51 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 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.controller;
+
+import lombok.Getter;
+
+public class DroolsControllerConstants  {
+
+    /**
+     * No Group ID identifier.
+     */
+    public static final String NO_GROUP_ID = "NO-GROUP-ID";
+
+    /**
+     * No Artifact ID identifier.
+     */
+    public static final String NO_ARTIFACT_ID = "NO-ARTIFACT-ID";
+
+    /**
+     * No version identifier.
+     */
+    public static final String NO_VERSION = "NO-VERSION";
+
+    /**
+     * Factory to track and manage drools controllers.
+     */
+    @Getter
+    private static final DroolsControllerFactory factory = new IndexedDroolsControllerFactory();
+
+    private DroolsControllerConstants() {
+        // do nothing
+    }
+}
diff --git a/policy-management/src/main/java/org/onap/policy/drools/controller/IndexedDroolsControllerFactory.java b/policy-management/src/main/java/org/onap/policy/drools/controller/IndexedDroolsControllerFactory.java
index 89e2a1a8..733a492d 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/controller/IndexedDroolsControllerFactory.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/controller/IndexedDroolsControllerFactory.java
@@ -32,7 +32,7 @@ import org.onap.policy.common.endpoints.event.comm.TopicSource;
 import org.onap.policy.common.endpoints.properties.PolicyEndPointProperties;
 import org.onap.policy.drools.controller.internal.MavenDroolsController;
 import org.onap.policy.drools.controller.internal.NullDroolsController;
-import org.onap.policy.drools.properties.DroolsProperties;
+import org.onap.policy.drools.properties.DroolsPropertyConstants;
 import org.onap.policy.drools.protocol.coders.JsonProtocolFilter;
 import org.onap.policy.drools.protocol.coders.TopicCoderFilterConfiguration;
 import org.onap.policy.drools.protocol.coders.TopicCoderFilterConfiguration.CustomGsonCoder;
@@ -79,19 +79,19 @@ class IndexedDroolsControllerFactory implements DroolsControllerFactory {
     public DroolsController build(Properties properties, List<? extends TopicSource> eventSources,
             List<? extends TopicSink> eventSinks) throws LinkageError {
 
-        String groupId = properties.getProperty(DroolsProperties.RULES_GROUPID);
+        String groupId = properties.getProperty(DroolsPropertyConstants.RULES_GROUPID);
         if (groupId == null || groupId.isEmpty()) {
-            groupId = DroolsController.NO_GROUP_ID;
+            groupId = DroolsControllerConstants.NO_GROUP_ID;
         }
 
-        String artifactId = properties.getProperty(DroolsProperties.RULES_ARTIFACTID);
+        String artifactId = properties.getProperty(DroolsPropertyConstants.RULES_ARTIFACTID);
         if (artifactId == null || artifactId.isEmpty()) {
-            artifactId = DroolsController.NO_ARTIFACT_ID;
+            artifactId = DroolsControllerConstants.NO_ARTIFACT_ID;
         }
 
-        String version = properties.getProperty(DroolsProperties.RULES_VERSION);
+        String version = properties.getProperty(DroolsPropertyConstants.RULES_VERSION);
         if (version == null || version.isEmpty()) {
-            version = DroolsController.NO_VERSION;
+            version = DroolsControllerConstants.NO_VERSION;
         }
 
         List<TopicCoderFilterConfiguration> topics2DecodedClasses2Filters = codersAndFilters(properties, eventSources);
diff --git a/policy-management/src/main/java/org/onap/policy/drools/controller/internal/MavenDroolsController.java b/policy-management/src/main/java/org/onap/policy/drools/controller/internal/MavenDroolsController.java
index b09ae85c..ca1f2283 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/controller/internal/MavenDroolsController.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/controller/internal/MavenDroolsController.java
@@ -43,11 +43,14 @@ import org.onap.policy.common.gson.annotation.GsonJsonIgnore;
 import org.onap.policy.common.gson.annotation.GsonJsonProperty;
 import org.onap.policy.common.utils.services.OrderedServiceImpl;
 import org.onap.policy.drools.controller.DroolsController;
+import org.onap.policy.drools.controller.DroolsControllerConstants;
 import org.onap.policy.drools.core.PolicyContainer;
 import org.onap.policy.drools.core.PolicySession;
 import org.onap.policy.drools.core.jmx.PdpJmx;
 import org.onap.policy.drools.features.DroolsControllerFeatureApi;
+import org.onap.policy.drools.features.DroolsControllerFeatureApiConstants;
 import org.onap.policy.drools.protocol.coders.EventProtocolCoder;
+import org.onap.policy.drools.protocol.coders.EventProtocolCoderConstants;
 import org.onap.policy.drools.protocol.coders.EventProtocolParams;
 import org.onap.policy.drools.protocol.coders.JsonProtocolFilter;
 import org.onap.policy.drools.protocol.coders.TopicCoderFilterConfiguration;
@@ -64,6 +67,8 @@ import org.slf4j.LoggerFactory;
  */
 public class MavenDroolsController implements DroolsController {
 
+    private static final String FACT_RETRIEVE_ERROR = "Object cannot be retrieved from fact {}";
+
     /**
      * logger.
      */
@@ -193,9 +198,9 @@ public class MavenDroolsController implements DroolsController {
             throw new IllegalArgumentException("Missing maven version coordinate");
         }
 
-        if (newGroupId.equalsIgnoreCase(DroolsController.NO_GROUP_ID)
-                || newArtifactId.equalsIgnoreCase(DroolsController.NO_ARTIFACT_ID)
-                || newVersion.equalsIgnoreCase(DroolsController.NO_VERSION)) {
+        if (newGroupId.equalsIgnoreCase(DroolsControllerConstants.NO_GROUP_ID)
+                || newArtifactId.equalsIgnoreCase(DroolsControllerConstants.NO_ARTIFACT_ID)
+                || newVersion.equalsIgnoreCase(DroolsControllerConstants.NO_VERSION)) {
             throw new IllegalArgumentException("BRAINLESS maven coordinates provided: "
                     + newGroupId + ":" + newArtifactId + ":"
                     + newVersion);
@@ -755,7 +760,7 @@ public class MavenDroolsController implements DroolsController {
                     classNames.put(className, 1);
                 }
             } catch (Exception e) {
-                logger.warn("Object cannot be retrieved from fact {}", fact, e);
+                logger.warn(FACT_RETRIEVE_ERROR, fact, e);
             }
         }
 
@@ -803,7 +808,7 @@ public class MavenDroolsController implements DroolsController {
                     kieSession.delete(factHandle);
                 }
             } catch (Exception e) {
-                logger.warn("Object cannot be retrieved from fact {}", factHandle, e);
+                logger.warn(FACT_RETRIEVE_ERROR, factHandle, e);
             }
         }
 
@@ -881,7 +886,7 @@ public class MavenDroolsController implements DroolsController {
                     return true;
                 }
             } catch (Exception e) {
-                logger.warn("Object cannot be retrieved from fact {}", factHandle, e);
+                logger.warn(FACT_RETRIEVE_ERROR, factHandle, e);
             }
         }
         return false;
@@ -889,7 +894,7 @@ public class MavenDroolsController implements DroolsController {
 
     @Override
     public <T> boolean delete(@NonNull T fact) {
-        return this.getSessionNames().stream().map((ss) -> delete(ss, fact)).reduce(false, Boolean::logicalOr);
+        return this.getSessionNames().stream().map(ss -> delete(ss, fact)).reduce(false, Boolean::logicalOr);
     }
 
     @Override
@@ -903,7 +908,7 @@ public class MavenDroolsController implements DroolsController {
             try {
                 kieSession.delete(factHandle);
             } catch (Exception e) {
-                logger.warn("Object cannot be retrieved from fact {}", factHandle, e);
+                logger.warn(FACT_RETRIEVE_ERROR, factHandle, e);
                 success = false;
             }
         }
@@ -912,7 +917,7 @@ public class MavenDroolsController implements DroolsController {
 
     @Override
     public <T> boolean delete(@NonNull Class<T> fact) {
-        return this.getSessionNames().stream().map((ss) -> delete(ss, fact)).reduce(false, Boolean::logicalOr);
+        return this.getSessionNames().stream().map(ss -> delete(ss, fact)).reduce(false, Boolean::logicalOr);
     }
 
 
@@ -972,11 +977,11 @@ public class MavenDroolsController implements DroolsController {
     // these may be overridden by junit tests
 
     protected EventProtocolCoder getCoderManager() {
-        return EventProtocolCoder.manager;
+        return EventProtocolCoderConstants.getManager();
     }
 
     protected OrderedServiceImpl<DroolsControllerFeatureApi> getDroolsProviders() {
-        return DroolsControllerFeatureApi.providers;
+        return DroolsControllerFeatureApiConstants.getProviders();
     }
 
     protected PolicyContainer makePolicyContainer(String groupId, String artifactId, String version) {
diff --git a/policy-management/src/main/java/org/onap/policy/drools/controller/internal/NullDroolsController.java b/policy-management/src/main/java/org/onap/policy/drools/controller/internal/NullDroolsController.java
index 4b38e722..5416d321 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/controller/internal/NullDroolsController.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/controller/internal/NullDroolsController.java
@@ -7,9 +7,9 @@
  * 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.
@@ -28,6 +28,7 @@ import java.util.Map;
 import org.checkerframework.checker.nullness.qual.NonNull;
 import org.onap.policy.common.endpoints.event.comm.TopicSink;
 import org.onap.policy.drools.controller.DroolsController;
+import org.onap.policy.drools.controller.DroolsControllerConstants;
 import org.onap.policy.drools.core.PolicyContainer;
 import org.onap.policy.drools.protocol.coders.TopicCoderFilterConfiguration;
 
@@ -78,17 +79,17 @@ public class NullDroolsController implements DroolsController {
 
     @Override
     public String getGroupId() {
-        return NO_GROUP_ID;
+        return DroolsControllerConstants.NO_GROUP_ID;
     }
 
     @Override
     public String getArtifactId() {
-        return NO_ARTIFACT_ID;
+        return DroolsControllerConstants.NO_ARTIFACT_ID;
     }
 
     @Override
     public String getVersion() {
-        return NO_VERSION;
+        return DroolsControllerConstants.NO_VERSION;
     }
 
     @Override
@@ -187,8 +188,8 @@ public class NullDroolsController implements DroolsController {
     }
 
     @Override
-    public List<Object> factQuery(String sessionName, String queryName, 
-            String queriedEntity, 
+    public List<Object> factQuery(String sessionName, String queryName,
+            String queriedEntity,
             boolean delete, Object... queryParams) {
         return new ArrayList<>();
     }
diff --git a/policy-management/src/main/java/org/onap/policy/drools/features/DroolsControllerFeatureApi.java b/policy-management/src/main/java/org/onap/policy/drools/features/DroolsControllerFeatureApi.java
index d5a16a12..abf524e4 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/features/DroolsControllerFeatureApi.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/features/DroolsControllerFeatureApi.java
@@ -22,7 +22,6 @@ package org.onap.policy.drools.features;
 
 import org.onap.policy.common.endpoints.event.comm.TopicSink;
 import org.onap.policy.common.utils.services.OrderedService;
-import org.onap.policy.common.utils.services.OrderedServiceImpl;
 import org.onap.policy.drools.controller.DroolsController;
 
 /**
@@ -74,10 +73,4 @@ public interface DroolsControllerFeatureApi extends OrderedService {
                     boolean success) {
         return false;
     }
-
-    /**
-     * Feature providers implementing this interface.
-     */
-    public static final OrderedServiceImpl<DroolsControllerFeatureApi> providers =
-            new OrderedServiceImpl<>(DroolsControllerFeatureApi.class);
 }
diff --git a/policy-management/src/main/java/org/onap/policy/drools/features/DroolsControllerFeatureApiConstants.java b/policy-management/src/main/java/org/onap/policy/drools/features/DroolsControllerFeatureApiConstants.java
new file mode 100644
index 00000000..5ff8e86f
--- /dev/null
+++ b/policy-management/src/main/java/org/onap/policy/drools/features/DroolsControllerFeatureApiConstants.java
@@ -0,0 +1,38 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 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.features;
+
+import lombok.Getter;
+import org.onap.policy.common.utils.services.OrderedServiceImpl;
+
+public class DroolsControllerFeatureApiConstants {
+
+    /**
+     * Feature providers implementing this interface.
+     */
+    @Getter
+    private static final OrderedServiceImpl<DroolsControllerFeatureApi> providers =
+            new OrderedServiceImpl<>(DroolsControllerFeatureApi.class);
+
+    private DroolsControllerFeatureApiConstants() {
+        // do nothing
+    }
+}
diff --git a/policy-management/src/main/java/org/onap/policy/drools/features/PolicyControllerFeatureApi.java b/policy-management/src/main/java/org/onap/policy/drools/features/PolicyControllerFeatureApi.java
index c9e78c6a..9c6ac223 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/features/PolicyControllerFeatureApi.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/features/PolicyControllerFeatureApi.java
@@ -23,18 +23,11 @@ package org.onap.policy.drools.features;
 import java.util.Properties;
 import org.onap.policy.common.endpoints.event.comm.Topic.CommInfrastructure;
 import org.onap.policy.common.utils.services.OrderedService;
-import org.onap.policy.common.utils.services.OrderedServiceImpl;
 import org.onap.policy.drools.system.PolicyController;
 
 public interface PolicyControllerFeatureApi extends OrderedService {
 
     /**
-     * Feature providers implementing this interface.
-     */
-    OrderedServiceImpl<PolicyControllerFeatureApi> providers =
-            new OrderedServiceImpl<>(PolicyControllerFeatureApi.class);
-
-    /**
      * called before creating a controller with name 'name' and
      * properties 'properties'.
      *
diff --git a/policy-management/src/main/java/org/onap/policy/drools/features/PolicyControllerFeatureApiConstants.java b/policy-management/src/main/java/org/onap/policy/drools/features/PolicyControllerFeatureApiConstants.java
new file mode 100644
index 00000000..230228f0
--- /dev/null
+++ b/policy-management/src/main/java/org/onap/policy/drools/features/PolicyControllerFeatureApiConstants.java
@@ -0,0 +1,38 @@
+/*
+ * ============LICENSE_START=======================================================
+ * policy-management
+ * ================================================================================
+ * Copyright (C) 2019 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.features;
+
+import lombok.Getter;
+import org.onap.policy.common.utils.services.OrderedServiceImpl;
+
+public class PolicyControllerFeatureApiConstants {
+
+    /**
+     * Feature providers implementing this interface.
+     */
+    @Getter
+    private static final OrderedServiceImpl<PolicyControllerFeatureApi> providers =
+            new OrderedServiceImpl<>(PolicyControllerFeatureApi.class);
+
+    private PolicyControllerFeatureApiConstants() {
+        // do nothing
+    }
+}
diff --git a/policy-management/src/main/java/org/onap/policy/drools/features/PolicyEngineFeatureApi.java b/policy-management/src/main/java/org/onap/policy/drools/features/PolicyEngineFeatureApi.java
index bd834c4d..b6d827a4 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/features/PolicyEngineFeatureApi.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/features/PolicyEngineFeatureApi.java
@@ -23,7 +23,6 @@ package org.onap.policy.drools.features;
 import java.util.Properties;
 import org.onap.policy.common.endpoints.event.comm.Topic.CommInfrastructure;
 import org.onap.policy.common.utils.services.OrderedService;
-import org.onap.policy.common.utils.services.OrderedServiceImpl;
 import org.onap.policy.drools.protocol.configuration.PdpdConfiguration;
 import org.onap.policy.drools.system.PolicyEngine;
 
@@ -32,11 +31,6 @@ import org.onap.policy.drools.system.PolicyEngine;
  * Provides Interception Points during the Policy Engine lifecycle.
  */
 public interface PolicyEngineFeatureApi extends OrderedService {
-    /**
-     * Feature providers implementing this interface.
-     */
-    public static final OrderedServiceImpl<PolicyEngineFeatureApi> providers =
-            new OrderedServiceImpl<>(PolicyEngineFeatureApi.class);
 
     /**
      * intercept before the Policy Engine is commanded to boot.
diff --git a/policy-management/src/main/java/org/onap/policy/drools/features/PolicyEngineFeatureApiConstants.java b/policy-management/src/main/java/org/onap/policy/drools/features/PolicyEngineFeatureApiConstants.java
new file mode 100644
index 00000000..e62714a5
--- /dev/null
+++ b/policy-management/src/main/java/org/onap/policy/drools/features/PolicyEngineFeatureApiConstants.java
@@ -0,0 +1,37 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * policy-engine
+ * ================================================================================
+ * Copyright (C) 2019 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.features;
+
+import lombok.Getter;
+import org.onap.policy.common.utils.services.OrderedServiceImpl;
+
+public class PolicyEngineFeatureApiConstants {
+    /**
+     * Feature providers implementing this interface.
+     */
+    @Getter
+    private static final OrderedServiceImpl<PolicyEngineFeatureApi> providers =
+            new OrderedServiceImpl<>(PolicyEngineFeatureApi.class);
+
+    private PolicyEngineFeatureApiConstants() {
+        // do nothing
+    }
+}
diff --git a/policy-management/src/main/java/org/onap/policy/drools/persistence/FileSystemPersistence.java b/policy-management/src/main/java/org/onap/policy/drools/persistence/FileSystemPersistence.java
index 88987eab..ca1ad371 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/persistence/FileSystemPersistence.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/persistence/FileSystemPersistence.java
@@ -34,7 +34,7 @@ import java.util.List;
 import java.util.Properties;
 
 import java.util.function.BiPredicate;
-import org.onap.policy.drools.properties.DroolsProperties;
+import org.onap.policy.drools.properties.DroolsPropertyConstants;
 import org.onap.policy.drools.utils.PropertyUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -111,7 +111,7 @@ public class FileSystemPersistence implements SystemPersistence {
     /**
      * Configuration directory.
      */
-    protected Path configurationDirectory = Paths.get(DEFAULT_CONFIGURATION_DIR);
+    protected Path configurationDirectory = Paths.get(SystemPersistenceConstants.DEFAULT_CONFIGURATION_DIR);
 
     /**
      * Logger.
@@ -123,11 +123,11 @@ public class FileSystemPersistence implements SystemPersistence {
         String tempConfigDir = configDir;
 
         if (tempConfigDir == null) {
-            tempConfigDir = DEFAULT_CONFIGURATION_DIR;
-            this.configurationDirectory = Paths.get(DEFAULT_CONFIGURATION_DIR);
+            tempConfigDir = SystemPersistenceConstants.DEFAULT_CONFIGURATION_DIR;
+            this.configurationDirectory = Paths.get(SystemPersistenceConstants.DEFAULT_CONFIGURATION_DIR);
         }
 
-        if (!tempConfigDir.equals(DEFAULT_CONFIGURATION_DIR)) {
+        if (!tempConfigDir.equals(SystemPersistenceConstants.DEFAULT_CONFIGURATION_DIR)) {
             this.configurationDirectory = Paths.get(tempConfigDir);
         }
 
@@ -263,9 +263,9 @@ public class FileSystemPersistence implements SystemPersistence {
     private boolean testControllerName(String controllerFilename, Properties controllerProperties) {
         String controllerName = controllerFilename
                 .substring(0, controllerFilename.length() - PROPERTIES_FILE_CONTROLLER_SUFFIX.length());
-        String controllerPropName = controllerProperties.getProperty(DroolsProperties.PROPERTY_CONTROLLER_NAME);
+        String controllerPropName = controllerProperties.getProperty(DroolsPropertyConstants.PROPERTY_CONTROLLER_NAME);
         if (controllerPropName == null) {
-            controllerProperties.setProperty(DroolsProperties.PROPERTY_CONTROLLER_NAME, controllerName);
+            controllerProperties.setProperty(DroolsPropertyConstants.PROPERTY_CONTROLLER_NAME, controllerName);
         } else if (!controllerPropName.equals(controllerName)) {
             logger.error("{}: mismatch controller named {} against {} in file {}",
                          this, controllerPropName, controllerName, controllerFilename);
@@ -290,7 +290,7 @@ public class FileSystemPersistence implements SystemPersistence {
         if (Files.exists(path)) {
             try {
                 logger.info("{}: there is an existing configuration file @ {} ", this, path);
-                Path bakPath = Paths.get(this.configurationDirectory.toString(), 
+                Path bakPath = Paths.get(this.configurationDirectory.toString(),
                                             name + fileSuffix + FILE_BACKUP_SUFFIX);
                 Files.copy(path, bakPath, StandardCopyOption.REPLACE_EXISTING);
             } catch (Exception e) {
@@ -365,7 +365,7 @@ public class FileSystemPersistence implements SystemPersistence {
 
         if (Files.exists(path)) {
             try {
-                Path bakPath = Paths.get(this.configurationDirectory.toString(), 
+                Path bakPath = Paths.get(this.configurationDirectory.toString(),
                                             name + fileSuffix + FILE_BACKUP_SUFFIX);
                 Files.move(path, bakPath, StandardCopyOption.REPLACE_EXISTING);
             } catch (final Exception e) {
diff --git a/policy-management/src/main/java/org/onap/policy/drools/persistence/SystemPersistence.java b/policy-management/src/main/java/org/onap/policy/drools/persistence/SystemPersistence.java
index ee1e8b52..d5a35c32 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/persistence/SystemPersistence.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/persistence/SystemPersistence.java
@@ -28,16 +28,6 @@ import java.util.Properties;
  * System Configuration.
  */
 public interface SystemPersistence {
-    /**
-     * configuration directory.
-     */
-    String DEFAULT_CONFIGURATION_DIR = "config";
-
-    /**
-     * Persistence Manager. For now it is a file-based properties management, In the future, it will
-     * probably be DB based, so manager implementation will change.
-     */
-    SystemPersistence manager = new FileSystemPersistence();
 
     /**
      * sets a configuration directory and ensures it exists.
diff --git a/policy-management/src/main/java/org/onap/policy/drools/persistence/SystemPersistenceConstants.java b/policy-management/src/main/java/org/onap/policy/drools/persistence/SystemPersistenceConstants.java
new file mode 100644
index 00000000..0b46fb02
--- /dev/null
+++ b/policy-management/src/main/java/org/onap/policy/drools/persistence/SystemPersistenceConstants.java
@@ -0,0 +1,41 @@
+/*
+ * ============LICENSE_START=======================================================
+ * policy-management
+ * ================================================================================
+ * Copyright (C) 2019 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.persistence;
+
+import lombok.Getter;
+
+public class SystemPersistenceConstants {
+    /**
+     * configuration directory.
+     */
+    public static final String DEFAULT_CONFIGURATION_DIR = "config";
+
+    /**
+     * Persistence Manager. For now it is a file-based properties management, In the future, it will
+     * probably be DB based, so manager implementation will change.
+     */
+    @Getter
+    private static final SystemPersistence manager = new FileSystemPersistence();
+
+    private SystemPersistenceConstants() {
+        // do nothing
+    }
+}
diff --git a/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/EventProtocolCoder.java b/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/EventProtocolCoder.java
index 62a0cbe2..6cbe94ae 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/EventProtocolCoder.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/EventProtocolCoder.java
@@ -29,11 +29,6 @@ import org.onap.policy.drools.controller.DroolsController;
  */
 public interface EventProtocolCoder {
 
-    /**
-     * singleton reference to the global event protocol coder.
-     */
-    public static EventProtocolCoder manager = new MultiplexorEventProtocolCoder();
-
     public static class CoderFilters {
 
         /**
diff --git a/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/EventProtocolCoderConstants.java b/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/EventProtocolCoderConstants.java
new file mode 100644
index 00000000..45dc39e4
--- /dev/null
+++ b/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/EventProtocolCoderConstants.java
@@ -0,0 +1,37 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2017-2019 AT&T Intellectual Property. All rights reserved.
+ * Modifications Copyright(C) 2018 Samsung Electronics Co., Ltd.
+ * ================================================================================
+ * 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.protocol.coders;
+
+import lombok.Getter;
+
+public class EventProtocolCoderConstants {
+
+    /**
+     * singleton reference to the global event protocol coder.
+     */
+    @Getter
+    private static final EventProtocolCoder manager = new MultiplexorEventProtocolCoder();
+
+    private EventProtocolCoderConstants() {
+        // do nothing
+    }
+}
diff --git a/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/GenericEventProtocolCoder.java b/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/GenericEventProtocolCoder.java
index 8643da3d..89a7a420 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/GenericEventProtocolCoder.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/GenericEventProtocolCoder.java
@@ -26,6 +26,7 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import org.onap.policy.drools.controller.DroolsController;
+import org.onap.policy.drools.controller.DroolsControllerConstants;
 import org.onap.policy.drools.protocol.coders.EventProtocolCoder.CoderFilters;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -35,15 +36,11 @@ import org.slf4j.LoggerFactory;
  * parsing tools.
  */
 abstract class GenericEventProtocolCoder {
-
     private static final String INVALID_ARTIFACT_ID_MSG = "Invalid artifact id";
-
     private static final String INVALID_GROUP_ID_MSG = "Invalid group id";
-
     private static final String INVALID_TOPIC_MSG = "Invalid Topic";
-
     private static final String UNSUPPORTED_MSG = "Unsupported";
-
+    private static final String UNSUPPORTED_EX_MSG = "Unsupported:";
     private static final String MISSING_CLASS = "class must be provided";
 
     private static Logger logger = LoggerFactory.getLogger(GenericEventProtocolCoder.class);
@@ -287,7 +284,7 @@ abstract class GenericEventProtocolCoder {
 
         if (!isCodingSupported(groupId, artifactId, topic)) {
             throw new IllegalArgumentException(
-                    "Unsupported:" + codersKey(groupId, artifactId, topic) + " for encoding");
+                    UNSUPPORTED_EX_MSG + codersKey(groupId, artifactId, topic) + " for encoding");
         }
 
         String key = this.codersKey(groupId, artifactId, topic);
@@ -318,7 +315,7 @@ abstract class GenericEventProtocolCoder {
     public String encode(String groupId, String artifactId, String topic, Object event) {
 
         if (!isCodingSupported(groupId, artifactId, topic)) {
-            throw new IllegalArgumentException("Unsupported:" + codersKey(groupId, artifactId, topic));
+            throw new IllegalArgumentException(UNSUPPORTED_EX_MSG + codersKey(groupId, artifactId, topic));
         }
 
         if (event == null) {
@@ -455,7 +452,8 @@ abstract class GenericEventProtocolCoder {
             List<CoderFilters> coderFilters = encoderSet.getCoders();
             for (CoderFilters coder : coderFilters) {
                 if (coder.getCodedClass().equals(encodedClass.getClass().getName())) {
-                    DroolsController droolsController = DroolsController.factory.get(groupId, artifactId, "");
+                    DroolsController droolsController =
+                                    DroolsControllerConstants.getFactory().get(groupId, artifactId, "");
                     if (droolsController.ownsCoder(
                             encodedClass.getClass(), coder.getModelClassLoaderHash())) {
                         droolsControllers.add(droolsController);
@@ -487,7 +485,7 @@ abstract class GenericEventProtocolCoder {
     public List<CoderFilters> getFilters(String groupId, String artifactId, String topic) {
 
         if (!isCodingSupported(groupId, artifactId, topic)) {
-            throw new IllegalArgumentException("Unsupported:" + codersKey(groupId, artifactId, topic));
+            throw new IllegalArgumentException(UNSUPPORTED_EX_MSG + codersKey(groupId, artifactId, topic));
         }
 
         String key = this.codersKey(groupId, artifactId, topic);
@@ -540,7 +538,7 @@ abstract class GenericEventProtocolCoder {
             String groupId, String artifactId, String topic, String classname) {
 
         if (!isCodingSupported(groupId, artifactId, topic)) {
-            throw new IllegalArgumentException("Unsupported:" + codersKey(groupId, artifactId, topic));
+            throw new IllegalArgumentException(UNSUPPORTED_EX_MSG + codersKey(groupId, artifactId, topic));
         }
 
         if (classname == null || classname.isEmpty()) {
@@ -565,7 +563,7 @@ abstract class GenericEventProtocolCoder {
             String groupId, String artifactId, String topic) {
 
         if (!isCodingSupported(groupId, artifactId, topic)) {
-            throw new IllegalArgumentException("Unsupported:" + codersKey(groupId, artifactId, topic));
+            throw new IllegalArgumentException(UNSUPPORTED_EX_MSG + codersKey(groupId, artifactId, topic));
         }
 
         String key = this.codersKey(groupId, artifactId, topic);
diff --git a/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/GsonProtocolCoderToolset.java b/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/GsonProtocolCoderToolset.java
index 57976a3e..ff154fb5 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/GsonProtocolCoderToolset.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/protocol/coders/GsonProtocolCoderToolset.java
@@ -37,6 +37,7 @@ import java.time.ZonedDateTime;
 import java.time.format.DateTimeFormatter;
 import org.onap.policy.common.gson.annotation.GsonJsonIgnore;
 import org.onap.policy.drools.controller.DroolsController;
+import org.onap.policy.drools.controller.DroolsControllerConstants;
 import org.onap.policy.drools.protocol.coders.EventProtocolCoder.CoderFilters;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -45,6 +46,8 @@ import org.slf4j.LoggerFactory;
  * Tools used for encoding/decoding using GSON.
  */
 class GsonProtocolCoderToolset extends ProtocolCoderToolset {
+    private static final String FETCH_CLASS_EX_MSG = "cannot fetch application class ";
+
     /**
      * Logger.
      */
@@ -155,7 +158,7 @@ class GsonProtocolCoderToolset extends ProtocolCoderToolset {
     public Object decode(String json) {
 
         final DroolsController droolsController =
-                DroolsController.factory.get(this.groupId, this.artifactId, "");
+                        DroolsControllerConstants.getFactory().get(this.groupId, this.artifactId, "");
         if (droolsController == null) {
             logger.warn("{}: no drools-controller to process {}", this, json);
             throw new IllegalStateException("no drools-controller to process event");
@@ -173,13 +176,13 @@ class GsonProtocolCoderToolset extends ProtocolCoderToolset {
             if (decoderClass == null) {
                 logger.warn("{}: cannot fetch application class {}", this, decoderFilter.getCodedClass());
                 throw new IllegalStateException(
-                        "cannot fetch application class " + decoderFilter.getCodedClass());
+                        FETCH_CLASS_EX_MSG + decoderFilter.getCodedClass());
             }
         } catch (final Exception e) {
             logger.warn("{}: cannot fetch application class {} because of {}", this,
                     decoderFilter.getCodedClass(), e.getMessage());
             throw new UnsupportedOperationException(
-                    "cannot fetch application class " + decoderFilter.getCodedClass(), e);
+                    FETCH_CLASS_EX_MSG + decoderFilter.getCodedClass(), e);
         }
 
         if (this.customCoder != null) {
@@ -195,7 +198,7 @@ class GsonProtocolCoderToolset extends ProtocolCoderToolset {
                 logger.warn("{}: cannot fetch application class {} because of {}", this,
                         decoderFilter.getCodedClass(), e.getMessage());
                 throw new UnsupportedOperationException(
-                        "cannot fetch application class " + decoderFilter.getCodedClass(), e);
+                        FETCH_CLASS_EX_MSG + decoderFilter.getCodedClass(), e);
             }
         } else {
             try {
@@ -218,7 +221,7 @@ class GsonProtocolCoderToolset extends ProtocolCoderToolset {
         if (this.customCoder != null) {
             try {
                 final DroolsController droolsController =
-                        DroolsController.factory.get(this.groupId, this.artifactId, null);
+                                DroolsControllerConstants.getFactory().get(this.groupId, this.artifactId, null);
                 final Class<?> gsonClassContainer =
                         droolsController.fetchModelClass(this.customCoder.getClassContainer());
                 final Field gsonField = gsonClassContainer.getField(this.customCoder.staticCoderField);
diff --git a/policy-management/src/main/java/org/onap/policy/drools/server/restful/RestManager.java b/policy-management/src/main/java/org/onap/policy/drools/server/restful/RestManager.java
index a5fbfdd3..2d40a1f1 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/server/restful/RestManager.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/server/restful/RestManager.java
@@ -58,15 +58,17 @@ import org.onap.policy.common.endpoints.event.comm.TopicSource;
 import org.onap.policy.drools.controller.DroolsController;
 import org.onap.policy.drools.features.PolicyControllerFeatureApi;
 import org.onap.policy.drools.features.PolicyEngineFeatureApi;
-import org.onap.policy.drools.properties.DroolsProperties;
-import org.onap.policy.drools.protocol.coders.EventProtocolCoder;
+import org.onap.policy.drools.properties.DroolsPropertyConstants;
 import org.onap.policy.drools.protocol.coders.EventProtocolCoder.CoderFilters;
+import org.onap.policy.drools.protocol.coders.EventProtocolCoderConstants;
 import org.onap.policy.drools.protocol.coders.JsonProtocolFilter;
 import org.onap.policy.drools.protocol.coders.ProtocolCoderToolset;
 import org.onap.policy.drools.protocol.configuration.ControllerConfiguration;
 import org.onap.policy.drools.protocol.configuration.PdpdConfiguration;
 import org.onap.policy.drools.system.PolicyController;
+import org.onap.policy.drools.system.PolicyControllerConstants;
 import org.onap.policy.drools.system.PolicyEngine;
+import org.onap.policy.drools.system.PolicyEngineConstants;
 import org.onap.policy.drools.utils.logging.LoggerUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -84,10 +86,49 @@ import org.slf4j.LoggerFactory;
         schemes = {SwaggerDefinition.Scheme.HTTP},
         tags = {@Tag(name = "pdp-d-telemetry", description = "Drools PDP Telemetry Operations")})
 public class RestManager {
+
+    private static final String CANNOT_PERFORM_OPERATION = "cannot perform operation";
+    private static final String NO_FILTERS = " no filters";
+    private static final String NOT_FOUND = " not found: ";
+    private static final String NOT_FOUND_MSG = " not found";
+    private static final String DOES_NOT_EXIST_MSG = " does not exist";
+    private static final String NOT_ACCEPTABLE_MSG = " not acceptable";
+    private static final String FETCH_POLICY_FAILED = "{}: cannot get policy-controller because of {}";
+    private static final String FETCH_POLICY_BY_NAME_FAILED = "{}: cannot get policy-controller {} because of {}";
+    private static final String FETCH_POLICY_BY_TOPIC_FAILED =
+                    "{}: cannot get policy-controller {} topic {} because of {}";
+    private static final String FETCH_DROOLS_FAILED = "{}: cannot get drools-controller {} because of {}";
+    private static final String FETCH_DROOLS_BY_ENTITY_FAILED =
+                    "{}: cannot get: drools-controller {}, session {}, query {}, entity {} because of {}";
+    private static final String FETCH_DROOLS_BY_PARAMS_FAILED =
+                    "{}: cannot get: drools-controller {}, session {}, query {}, entity {}, params {} because of {}";
+    private static final String FETCH_DROOLS_BY_FACTTYPE_FAILED =
+                    "{}: cannot get: drools-controller {}, session {}, factType {}, because of {}";
+    private static final String FETCH_DECODERS_BY_POLICY_FAILED =
+                    "{}: cannot get decoders for policy-controller {} because of {}";
+    private static final String FETCH_DECODERS_BY_TOPIC_FAILED =
+                    "{}: cannot get decoders for policy-controller {} topic {} because of {}";
+    private static final String FETCH_DECODER_BY_TYPE_FAILED =
+                    "{}: cannot get decoder filters for policy-controller {} topic {} type {} because of {}";
+    private static final String FETCH_DECODER_BY_FILTER_FAILED =
+                    "{}: cannot get decoder filters for policy-controller {} topic {} type {} filters {} because of {}";
+    private static final String FETCH_ENCODER_BY_FILTER_FAILED =
+                    "{}: cannot get encoder filters for policy-controller {} because of {}";
+
     /**
      * Logger.
      */
-    private static Logger logger = LoggerFactory.getLogger(RestManager.class);
+    private static final Logger logger = LoggerFactory.getLogger(RestManager.class);
+
+    /**
+     * Feed Ports into Resources.
+     */
+    private static final List<String> INPUTS = Arrays.asList("configuration");
+
+    /**
+     * Resource Toggles.
+     */
+    private static final List<String> SWITCHES = Arrays.asList("activation", "lock");
 
     /**
      * GET.
@@ -99,7 +140,7 @@ public class RestManager {
     @ApiOperation(value = "Retrieves the Engine Operational Status",
             notes = "Top-level abstraction.  Provides a global view of resources", response = PolicyEngine.class)
     public Response engine() {
-        return Response.status(Response.Status.OK).entity(PolicyEngine.manager).build();
+        return Response.status(Response.Status.OK).entity(PolicyEngineConstants.getManager()).build();
     }
 
     /**
@@ -114,13 +155,14 @@ public class RestManager {
             response = PolicyEngine.class)
     public Response engineShutdown() {
         try {
-            PolicyEngine.manager.shutdown();
+            PolicyEngineConstants.getManager().shutdown();
         } catch (final IllegalStateException e) {
-            logger.error("{}: cannot shutdown {} because of {}", this, PolicyEngine.manager, e.getMessage(), e);
-            return Response.status(Response.Status.BAD_REQUEST).entity(PolicyEngine.manager).build();
+            logger.error("{}: cannot shutdown {} because of {}", this, PolicyEngineConstants.getManager(),
+                            e.getMessage(), e);
+            return Response.status(Response.Status.BAD_REQUEST).entity(PolicyEngineConstants.getManager()).build();
         }
 
-        return Response.status(Response.Status.OK).entity(PolicyEngine.manager).build();
+        return Response.status(Response.Status.OK).entity(PolicyEngineConstants.getManager()).build();
     }
 
     /**
@@ -133,7 +175,7 @@ public class RestManager {
     @ApiOperation(value = "Engine Features",
             notes = "Provides the list of loaded features using the PolicyEngineFeatureAPI", responseContainer = "List")
     public Response engineFeatures() {
-        return Response.status(Response.Status.OK).entity(PolicyEngine.manager.getFeatures()).build();
+        return Response.status(Response.Status.OK).entity(PolicyEngineConstants.getManager().getFeatures()).build();
     }
 
     @GET
@@ -142,7 +184,8 @@ public class RestManager {
             notes = "Provides detailed list of loaded features using the PolicyEngineFeatureAPI",
             responseContainer = "List", response = PolicyEngineFeatureApi.class)
     public Response engineFeaturesInventory() {
-        return Response.status(Response.Status.OK).entity(PolicyEngine.manager.getFeatureProviders()).build();
+        return Response.status(Response.Status.OK).entity(PolicyEngineConstants.getManager().getFeatureProviders())
+                        .build();
     }
 
     /**
@@ -158,8 +201,8 @@ public class RestManager {
     public Response engineFeature(
             @ApiParam(value = "Feature Name", required = true) @PathParam("featureName") String featureName) {
         try {
-            return Response.status(Response.Status.OK).entity(PolicyEngine.manager.getFeatureProvider(featureName))
-                    .build();
+            return Response.status(Response.Status.OK)
+                            .entity(PolicyEngineConstants.getManager().getFeatureProvider(featureName)).build();
         } catch (final IllegalArgumentException iae) {
             logger.debug("feature unavailable: {}", featureName, iae);
             return Response.status(Response.Status.NOT_FOUND).entity(new Error(iae.getMessage())).build();
@@ -175,7 +218,7 @@ public class RestManager {
     @Path("engine/inputs")
     @ApiOperation(value = "Engine Input Ports", notes = "List of input ports", responseContainer = "List")
     public Response engineInputs() {
-        return Response.status(Response.Status.OK).entity(Arrays.asList(Inputs.values())).build();
+        return Response.status(Response.Status.OK).entity(INPUTS).build();
     }
 
     /**
@@ -193,14 +236,15 @@ public class RestManager {
         final PolicyController controller = null;
         boolean success;
         try {
-            success = PolicyEngine.manager.configure(configuration);
+            success = PolicyEngineConstants.getManager().configure(configuration);
         } catch (final Exception e) {
             success = false;
-            logger.info("{}: cannot configure {} because of {}", this, PolicyEngine.manager, e.getMessage(), e);
+            logger.info("{}: cannot configure {} because of {}", this, PolicyEngineConstants.getManager(),
+                            e.getMessage(), e);
         }
 
         if (!success) {
-            return Response.status(Response.Status.NOT_ACCEPTABLE).entity(new Error("cannot perform operation"))
+            return Response.status(Response.Status.NOT_ACCEPTABLE).entity(new Error(CANNOT_PERFORM_OPERATION))
                     .build();
         } else {
             return Response.status(Response.Status.OK).entity(controller).build();
@@ -217,7 +261,7 @@ public class RestManager {
     @ApiOperation(value = "Engine Configuration Properties", notes = "Used for booststrapping the engine",
             response = Properties.class)
     public Response engineProperties() {
-        return Response.status(Response.Status.OK).entity(PolicyEngine.manager.getProperties()).build();
+        return Response.status(Response.Status.OK).entity(PolicyEngineConstants.getManager().getProperties()).build();
     }
 
     /**
@@ -230,7 +274,7 @@ public class RestManager {
     @ApiOperation(value = "Engine Environment Properties",
             notes = "Installation and OS environment properties used by the engine", response = Properties.class)
     public Response engineEnvironment() {
-        return Response.status(Response.Status.OK).entity(PolicyEngine.manager.getEnvironment()).build();
+        return Response.status(Response.Status.OK).entity(PolicyEngineConstants.getManager().getEnvironment()).build();
     }
 
     /**
@@ -243,9 +287,10 @@ public class RestManager {
     @Consumes(MediaType.TEXT_PLAIN)
     @ApiOperation(value = "Gets an environment variable", response = String.class)
     public Response engineEnvironment(
-            @ApiParam(value = "Environment Property", required = true) @PathParam("envProperty") String envProperty) {
-        return Response.status(Response.Status.OK).entity(PolicyEngine.manager.getEnvironmentProperty(envProperty))
-                .build();
+                    @ApiParam(value = "Environment Property",
+                                    required = true) @PathParam("envProperty") String envProperty) {
+        return Response.status(Response.Status.OK)
+                        .entity(PolicyEngineConstants.getManager().getEnvironmentProperty(envProperty)).build();
     }
 
     /**
@@ -261,7 +306,7 @@ public class RestManager {
     public Response engineEnvironmentAdd(
             @ApiParam(value = "Environment Property", required = true) @PathParam("envProperty") String envProperty,
             @ApiParam(value = "Environment Value", required = true) String envValue) {
-        final String previousValue = PolicyEngine.manager.setEnvironmentProperty(envProperty, envValue);
+        final String previousValue = PolicyEngineConstants.getManager().setEnvironmentProperty(envProperty, envValue);
         return Response.status(Response.Status.OK).entity(previousValue).build();
     }
 
@@ -275,7 +320,7 @@ public class RestManager {
     @ApiOperation(value = "Engine Control Switches", notes = "List of the Engine Control Switches",
             responseContainer = "List")
     public Response engineSwitches() {
-        return Response.status(Response.Status.OK).entity(Arrays.asList(Switches.values())).build();
+        return Response.status(Response.Status.OK).entity(SWITCHES).build();
     }
 
     /**
@@ -292,17 +337,18 @@ public class RestManager {
     public Response engineActivation() {
         boolean success = true;
         try {
-            PolicyEngine.manager.activate();
+            PolicyEngineConstants.getManager().activate();
         } catch (final Exception e) {
             success = false;
-            logger.info("{}: cannot activate {} because of {}", this, PolicyEngine.manager, e.getMessage(), e);
+            logger.info("{}: cannot activate {} because of {}", this, PolicyEngineConstants.getManager(),
+                            e.getMessage(), e);
         }
 
         if (!success) {
-            return Response.status(Response.Status.NOT_ACCEPTABLE).entity(new Error("cannot perform operation"))
+            return Response.status(Response.Status.NOT_ACCEPTABLE).entity(new Error(CANNOT_PERFORM_OPERATION))
                     .build();
         } else {
-            return Response.status(Response.Status.OK).entity(PolicyEngine.manager).build();
+            return Response.status(Response.Status.OK).entity(PolicyEngineConstants.getManager()).build();
         }
     }
 
@@ -320,17 +366,18 @@ public class RestManager {
     public Response engineDeactivation() {
         boolean success = true;
         try {
-            PolicyEngine.manager.deactivate();
+            PolicyEngineConstants.getManager().deactivate();
         } catch (final Exception e) {
             success = false;
-            logger.info("{}: cannot deactivate {} because of {}", this, PolicyEngine.manager, e.getMessage(), e);
+            logger.info("{}: cannot deactivate {} because of {}", this, PolicyEngineConstants.getManager(),
+                            e.getMessage(), e);
         }
 
         if (!success) {
-            return Response.status(Response.Status.NOT_ACCEPTABLE).entity(new Error("cannot perform operation"))
+            return Response.status(Response.Status.NOT_ACCEPTABLE).entity(new Error(CANNOT_PERFORM_OPERATION))
                     .build();
         } else {
-            return Response.status(Response.Status.OK).entity(PolicyEngine.manager).build();
+            return Response.status(Response.Status.OK).entity(PolicyEngineConstants.getManager()).build();
         }
     }
 
@@ -347,11 +394,11 @@ public class RestManager {
     @ApiResponses(value = {@ApiResponse(code = 406,
             message = "The system is an administrative state that prevents " + "this request to be fulfilled")})
     public Response engineLock() {
-        final boolean success = PolicyEngine.manager.lock();
+        final boolean success = PolicyEngineConstants.getManager().lock();
         if (success) {
-            return Response.status(Status.OK).entity(PolicyEngine.manager).build();
+            return Response.status(Status.OK).entity(PolicyEngineConstants.getManager()).build();
         } else {
-            return Response.status(Status.NOT_ACCEPTABLE).entity(new Error("cannot perform operation")).build();
+            return Response.status(Status.NOT_ACCEPTABLE).entity(new Error(CANNOT_PERFORM_OPERATION)).build();
         }
     }
 
@@ -368,11 +415,11 @@ public class RestManager {
     @ApiResponses(value = {@ApiResponse(code = 406,
             message = "The system is an administrative state that prevents " + "this request to be fulfilled")})
     public Response engineUnlock() {
-        final boolean success = PolicyEngine.manager.unlock();
+        final boolean success = PolicyEngineConstants.getManager().unlock();
         if (success) {
-            return Response.status(Status.OK).entity(PolicyEngine.manager).build();
+            return Response.status(Status.OK).entity(PolicyEngineConstants.getManager()).build();
         } else {
-            return Response.status(Status.NOT_ACCEPTABLE).entity(new Error("cannot perform operation")).build();
+            return Response.status(Status.NOT_ACCEPTABLE).entity(new Error(CANNOT_PERFORM_OPERATION)).build();
         }
     }
 
@@ -386,7 +433,8 @@ public class RestManager {
     @ApiOperation(value = "Lists the Policy Controllers Names", notes = "Unique Policy Controller Identifiers",
             responseContainer = "List")
     public Response controllers() {
-        return Response.status(Response.Status.OK).entity(PolicyEngine.manager.getPolicyControllerIds()).build();
+        return Response.status(Response.Status.OK).entity(PolicyEngineConstants.getManager().getPolicyControllerIds())
+                        .build();
     }
 
     /**
@@ -399,7 +447,8 @@ public class RestManager {
     @ApiOperation(value = "Lists the Policy Controllers", notes = "Detailed list of Policy Controllers",
             responseContainer = "List", response = PolicyController.class)
     public Response controllerInventory() {
-        return Response.status(Response.Status.OK).entity(PolicyEngine.manager.getPolicyControllers()).build();
+        return Response.status(Response.Status.OK).entity(PolicyEngineConstants.getManager().getPolicyControllers())
+                        .build();
     }
 
     /**
@@ -424,17 +473,17 @@ public class RestManager {
                     .build();
         }
 
-        final String controllerName = config.getProperty(DroolsProperties.PROPERTY_CONTROLLER_NAME);
+        final String controllerName = config.getProperty(DroolsPropertyConstants.PROPERTY_CONTROLLER_NAME);
         if (controllerName == null || controllerName.isEmpty()) {
             return Response.status(Response.Status.BAD_REQUEST)
                     .entity(new Error(
-                            "Configuration must have an entry for " + DroolsProperties.PROPERTY_CONTROLLER_NAME))
+                            "Configuration must have an entry for " + DroolsPropertyConstants.PROPERTY_CONTROLLER_NAME))
                     .build();
         }
 
         PolicyController controller;
         try {
-            controller = PolicyController.factory.get(controllerName);
+            controller = PolicyControllerConstants.getFactory().get(controllerName);
             if (controller != null) {
                 return Response.status(Response.Status.NOT_MODIFIED).entity(controller).build();
             }
@@ -442,14 +491,14 @@ public class RestManager {
             logger.trace("OK ", e);
             // This is OK
         } catch (final IllegalStateException e) {
-            logger.info("{}: cannot get policy-controller because of {}", this, e.getMessage(), e);
-            return Response.status(Response.Status.NOT_ACCEPTABLE).entity(new Error(controllerName + " not found"))
+            logger.info(FETCH_POLICY_FAILED, this, e.getMessage(), e);
+            return Response.status(Response.Status.NOT_ACCEPTABLE).entity(new Error(controllerName + NOT_FOUND_MSG))
                     .build();
         }
 
         try {
-            controller = PolicyEngine.manager
-                    .createPolicyController(config.getProperty(DroolsProperties.PROPERTY_CONTROLLER_NAME), config);
+            controller = PolicyEngineConstants.getManager().createPolicyController(
+                            config.getProperty(DroolsPropertyConstants.PROPERTY_CONTROLLER_NAME), config);
         } catch (IllegalArgumentException | IllegalStateException e) {
             logger.warn("{}: cannot create policy-controller because of {}", this, e.getMessage(), e);
             return Response.status(Response.Status.BAD_REQUEST).entity(new Error(e.getMessage())).build();
@@ -480,7 +529,7 @@ public class RestManager {
     @ApiOperation(value = "Lists of Feature Providers Identifiers", notes = "Unique Policy Controller Identifiers",
             responseContainer = "List")
     public Response controllerFeatures() {
-        return Response.status(Response.Status.OK).entity(PolicyEngine.manager.getFeatures()).build();
+        return Response.status(Response.Status.OK).entity(PolicyEngineConstants.getManager().getFeatures()).build();
     }
 
     /**
@@ -494,7 +543,8 @@ public class RestManager {
             notes = "Provides detailed list of loaded features using the PolicyControllerFeatureAPI",
             responseContainer = "List", response = PolicyControllerFeatureApi.class)
     public Response controllerFeaturesInventory() {
-        return Response.status(Response.Status.OK).entity(PolicyController.factory.getFeatureProviders()).build();
+        return Response.status(Response.Status.OK)
+                        .entity(PolicyControllerConstants.getFactory().getFeatureProviders()).build();
     }
 
     /**
@@ -511,8 +561,9 @@ public class RestManager {
     public Response controllerFeature(
             @ApiParam(value = "Feature Name", required = true) @PathParam("featureName") String featureName) {
         try {
-            return Response.status(Response.Status.OK).entity(PolicyController.factory.getFeatureProvider(featureName))
-                    .build();
+            return Response.status(Response.Status.OK)
+                            .entity(PolicyControllerConstants.getFactory().getFeatureProvider(featureName))
+                            .build();
         } catch (final IllegalArgumentException iae) {
             logger.debug("{}: cannot feature {} because of {}", this, featureName, iae.getMessage(), iae);
             return Response.status(Response.Status.NOT_FOUND).entity(new Error(iae.getMessage())).build();
@@ -537,14 +588,15 @@ public class RestManager {
     public Response controller(@ApiParam(value = "Policy Controller Name",
             required = true) @PathParam("controller") String controllerName) {
         try {
-            return Response.status(Response.Status.OK).entity(PolicyController.factory.get(controllerName)).build();
+            return Response.status(Response.Status.OK)
+                            .entity(PolicyControllerConstants.getFactory().get(controllerName)).build();
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get policy-controller {} because of {}", this, controllerName, e.getMessage(), e);
-            return Response.status(Response.Status.NOT_FOUND).entity(new Error(controllerName + " not found")).build();
+            logger.debug(FETCH_POLICY_BY_NAME_FAILED, this, controllerName, e.getMessage(), e);
+            return Response.status(Response.Status.NOT_FOUND).entity(new Error(controllerName + NOT_FOUND_MSG)).build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get policy-controller {} because of {}", this, controllerName, e.getMessage(), e);
-            return Response.status(Response.Status.NOT_ACCEPTABLE).entity(new Error(controllerName + " not acceptable"))
-                    .build();
+            logger.debug(FETCH_POLICY_BY_NAME_FAILED, this, controllerName, e.getMessage(), e);
+            return Response.status(Response.Status.NOT_ACCEPTABLE)
+                            .entity(new Error(controllerName + NOT_ACCEPTABLE_MSG)).build();
         }
     }
 
@@ -569,23 +621,23 @@ public class RestManager {
 
         PolicyController controller;
         try {
-            controller = PolicyController.factory.get(controllerName);
+            controller = PolicyControllerConstants.getFactory().get(controllerName);
             if (controller == null) {
                 return Response.status(Response.Status.BAD_REQUEST)
-                        .entity(new Error(controllerName + "  does not exist")).build();
+                        .entity(new Error(controllerName + DOES_NOT_EXIST_MSG)).build();
             }
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get policy-controller {} because of {}", this, controllerName, e.getMessage(), e);
+            logger.debug(FETCH_POLICY_BY_NAME_FAILED, this, controllerName, e.getMessage(), e);
             return Response.status(Response.Status.BAD_REQUEST)
-                    .entity(new Error(controllerName + " not found: " + e.getMessage())).build();
+                    .entity(new Error(controllerName + NOT_FOUND + e.getMessage())).build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get policy-controller {} because of {}", this, controllerName, e.getMessage(), e);
-            return Response.status(Response.Status.NOT_ACCEPTABLE).entity(new Error(controllerName + " not acceptable"))
-                    .build();
+            logger.debug(FETCH_POLICY_BY_NAME_FAILED, this, controllerName, e.getMessage(), e);
+            return Response.status(Response.Status.NOT_ACCEPTABLE)
+                            .entity(new Error(controllerName + NOT_ACCEPTABLE_MSG)).build();
         }
 
         try {
-            PolicyEngine.manager.removePolicyController(controllerName);
+            PolicyEngineConstants.getManager().removePolicyController(controllerName);
         } catch (IllegalArgumentException | IllegalStateException e) {
             logger.debug("{}: cannot remove policy-controller {} because of {}", this, controllerName, e.getMessage(),
                     e);
@@ -611,15 +663,15 @@ public class RestManager {
     public Response controllerProperties(@ApiParam(value = "Policy Controller Name",
             required = true) @PathParam("controller") String controllerName) {
         try {
-            final PolicyController controller = PolicyController.factory.get(controllerName);
+            final PolicyController controller = PolicyControllerConstants.getFactory().get(controllerName);
             return Response.status(Response.Status.OK).entity(controller.getProperties()).build();
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get policy-controller {} because of {}", this, controllerName, e.getMessage(), e);
-            return Response.status(Response.Status.NOT_FOUND).entity(new Error(controllerName + " not found")).build();
+            logger.debug(FETCH_POLICY_BY_NAME_FAILED, this, controllerName, e.getMessage(), e);
+            return Response.status(Response.Status.NOT_FOUND).entity(new Error(controllerName + NOT_FOUND_MSG)).build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get policy-controller {} because of {}", this, controllerName, e.getMessage(), e);
-            return Response.status(Response.Status.NOT_ACCEPTABLE).entity(new Error(controllerName + " not acceptable"))
-                    .build();
+            logger.debug(FETCH_POLICY_BY_NAME_FAILED, this, controllerName, e.getMessage(), e);
+            return Response.status(Response.Status.NOT_ACCEPTABLE)
+                            .entity(new Error(controllerName + NOT_ACCEPTABLE_MSG)).build();
         }
     }
 
@@ -632,7 +684,7 @@ public class RestManager {
     @Path("engine/controllers/{controller}/inputs")
     @ApiOperation(value = "Policy Controller Input Ports", notes = "List of input ports", responseContainer = "List")
     public Response controllerInputs() {
-        return Response.status(Response.Status.OK).entity(Arrays.asList(Inputs.values())).build();
+        return Response.status(Response.Status.OK).entity(INPUTS).build();
     }
 
     /**
@@ -659,21 +711,21 @@ public class RestManager {
 
         PolicyController controller;
         try {
-            controller = PolicyEngine.manager.updatePolicyController(controllerConfiguration);
+            controller = PolicyEngineConstants.getManager().updatePolicyController(controllerConfiguration);
             if (controller == null) {
                 return Response.status(Response.Status.BAD_REQUEST)
-                        .entity(new Error(controllerName + "  does not exist")).build();
+                        .entity(new Error(controllerName + DOES_NOT_EXIST_MSG)).build();
             }
         } catch (final IllegalArgumentException e) {
             logger.info("{}: cannot update policy-controller {} because of {}", this, controllerName, e.getMessage(),
                     e);
             return Response.status(Response.Status.BAD_REQUEST)
-                    .entity(new Error(controllerName + " not found: " + e.getMessage())).build();
+                    .entity(new Error(controllerName + NOT_FOUND + e.getMessage())).build();
         } catch (final Exception e) {
             logger.info("{}: cannot update policy-controller {} because of {}", this, controllerName, e.getMessage(),
-                    e);
-            return Response.status(Response.Status.NOT_ACCEPTABLE).entity(new Error(controllerName + " not acceptable"))
-                    .build();
+                            e);
+            return Response.status(Response.Status.NOT_ACCEPTABLE)
+                            .entity(new Error(controllerName + NOT_ACCEPTABLE_MSG)).build();
         }
 
         return Response.status(Response.Status.OK).entity(controller).build();
@@ -689,7 +741,7 @@ public class RestManager {
     @ApiOperation(value = "Policy Controller Switches", notes = "List of the Policy Controller Switches",
             responseContainer = "List")
     public Response controllerSwitches() {
-        return Response.status(Response.Status.OK).entity(Arrays.asList(Switches.values())).build();
+        return Response.status(Response.Status.OK).entity(SWITCHES).build();
     }
 
     /**
@@ -705,7 +757,7 @@ public class RestManager {
             message = "The system is an administrative state that prevents " + "this request to be fulfilled")})
     public Response controllerLock(@ApiParam(value = "Policy Controller Name",
             required = true) @PathParam("controller") String controllerName) {
-        final PolicyController policyController = PolicyController.factory.get(controllerName);
+        final PolicyController policyController = PolicyControllerConstants.getFactory().get(controllerName);
         final boolean success = policyController.lock();
         if (success) {
             return Response.status(Status.OK).entity(policyController).build();
@@ -728,7 +780,7 @@ public class RestManager {
             message = "The system is an administrative state that prevents " + "this request to be fulfilled")})
     public Response controllerUnlock(@ApiParam(value = "Policy Controller Name",
             required = true) @PathParam("controller") String controllerName) {
-        final PolicyController policyController = PolicyController.factory.get(controllerName);
+        final PolicyController policyController = PolicyControllerConstants.getFactory().get(controllerName);
         final boolean success = policyController.unlock();
         if (success) {
             return Response.status(Status.OK).entity(policyController).build();
@@ -757,12 +809,12 @@ public class RestManager {
             final DroolsController drools = this.getDroolsController(controllerName);
             return Response.status(Response.Status.OK).entity(drools).build();
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get drools-controller {} because of {}", this, controllerName, e.getMessage(), e);
-            return Response.status(Response.Status.NOT_FOUND).entity(new Error(controllerName + " not found")).build();
+            logger.debug(FETCH_DROOLS_FAILED, this, controllerName, e.getMessage(), e);
+            return Response.status(Response.Status.NOT_FOUND).entity(new Error(controllerName + NOT_FOUND_MSG)).build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get drools-controller {} because of {}", this, controllerName, e.getMessage(), e);
-            return Response.status(Response.Status.NOT_ACCEPTABLE).entity(new Error(controllerName + " not acceptable"))
-                    .build();
+            logger.debug(FETCH_DROOLS_FAILED, this, controllerName, e.getMessage(), e);
+            return Response.status(Response.Status.NOT_ACCEPTABLE)
+                            .entity(new Error(controllerName + NOT_ACCEPTABLE_MSG)).build();
         }
     }
 
@@ -789,12 +841,12 @@ public class RestManager {
             }
             return Response.status(Response.Status.OK).entity(sessionCounts).build();
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get policy-controller {} because of {}", this, controllerName, e.getMessage(), e);
-            return Response.status(Response.Status.NOT_FOUND).entity(new Error(controllerName + " not found")).build();
+            logger.debug(FETCH_POLICY_BY_NAME_FAILED, this, controllerName, e.getMessage(), e);
+            return Response.status(Response.Status.NOT_FOUND).entity(new Error(controllerName + NOT_FOUND_MSG)).build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get policy-controller {} because of {}", this, controllerName, e.getMessage(), e);
-            return Response.status(Response.Status.NOT_ACCEPTABLE).entity(new Error(controllerName + " not acceptable"))
-                    .build();
+            logger.debug(FETCH_POLICY_BY_NAME_FAILED, this, controllerName, e.getMessage(), e);
+            return Response.status(Response.Status.NOT_ACCEPTABLE)
+                            .entity(new Error(controllerName + NOT_ACCEPTABLE_MSG)).build();
         }
     }
 
@@ -818,12 +870,12 @@ public class RestManager {
             final DroolsController drools = this.getDroolsController(controllerName);
             return Response.status(Response.Status.OK).entity(drools.factClassNames(sessionName)).build();
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get drools-controller {} because of {}", this, controllerName, e.getMessage(), e);
+            logger.debug(FETCH_DROOLS_FAILED, this, controllerName, e.getMessage(), e);
             return Response.status(Response.Status.NOT_FOUND).entity(new Error("entity not found")).build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get drools-controller {} because of {}", this, controllerName, e.getMessage(), e);
+            logger.debug(FETCH_DROOLS_FAILED, this, controllerName, e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
-                    .entity(new Error(controllerName + ":" + sessionName + " not acceptable")).build();
+                    .entity(new Error(controllerName + ":" + sessionName + NOT_ACCEPTABLE_MSG)).build();
         }
     }
 
@@ -856,13 +908,14 @@ public class RestManager {
                 return Response.status(Response.Status.OK).entity(facts.size()).build();
             }
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get policy-controller {} because of {}", this, controllerName, e.getMessage(), e);
+            logger.debug(FETCH_POLICY_BY_NAME_FAILED, this, controllerName, e.getMessage(), e);
             return Response.status(Response.Status.NOT_FOUND)
-                    .entity(new Error(controllerName + ":" + sessionName + ":" + factType + " not found")).build();
+                    .entity(new Error(controllerName + ":" + sessionName + ":" + factType + NOT_FOUND_MSG)).build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get policy-controller {} because of {}", this, controllerName, e.getMessage(), e);
+            logger.debug(FETCH_POLICY_BY_NAME_FAILED, this, controllerName, e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
-                    .entity(new Error(controllerName + ":" + sessionName + ":" + factType + " not acceptable")).build();
+                            .entity(new Error(controllerName + ":" + sessionName + ":" + factType + NOT_ACCEPTABLE_MSG))
+                            .build();
         }
     }
 
@@ -899,21 +952,21 @@ public class RestManager {
                 return Response.status(Response.Status.OK).entity(facts.size()).build();
             }
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get: drools-controller {}, session {}, query {}, entity {} because of {}", this,
+            logger.debug(FETCH_DROOLS_BY_ENTITY_FAILED, this,
                     controllerName, sessionName, queryName, queriedEntity, e.getMessage(), e);
             return Response.status(Response.Status.NOT_FOUND)
                     .entity(new Error(
-                            controllerName + ":" + sessionName + ":" + queryName + queriedEntity + " not found"))
+                            controllerName + ":" + sessionName + ":" + queryName + queriedEntity + NOT_FOUND_MSG))
                     .build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get: drools-controller {}, session {}, query {}, entity {} because of {}", this,
+            logger.debug(FETCH_DROOLS_BY_ENTITY_FAILED, this,
                     controllerName, sessionName, queryName, queriedEntity, e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
                     .entity(new Error(
-                            controllerName + ":" + sessionName + ":" + queryName + queriedEntity + " not acceptable"))
+                            controllerName + ":" + sessionName + ":" + queryName + queriedEntity + NOT_ACCEPTABLE_MSG))
                     .build();
         } catch (final Exception e) {
-            logger.debug("{}: cannot get: drools-controller {}, session {}, query {}, entity {} because of {}", this,
+            logger.debug(FETCH_DROOLS_BY_ENTITY_FAILED, this,
                     controllerName, sessionName, queryName, queriedEntity, e.getMessage(), e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(new Error(e.getMessage())).build();
         }
@@ -954,23 +1007,23 @@ public class RestManager {
             return Response.status(Response.Status.OK).entity(facts).build();
         } catch (final IllegalArgumentException e) {
             logger.debug(
-                    "{}: cannot get: drools-controller {}, session {}, query {}, entity {}, params {} because of {}",
+                    FETCH_DROOLS_BY_PARAMS_FAILED,
                     this, controllerName, sessionName, queryName, queriedEntity, queryParameters, e.getMessage(), e);
             return Response.status(Response.Status.NOT_FOUND)
                     .entity(new Error(
-                            controllerName + ":" + sessionName + ":" + queryName + queriedEntity + " not found"))
+                            controllerName + ":" + sessionName + ":" + queryName + queriedEntity + NOT_FOUND_MSG))
                     .build();
         } catch (final IllegalStateException e) {
             logger.debug(
-                    "{}: cannot get: drools-controller {}, session {}, query {}, entity {}, params {} because of {}",
+                    FETCH_DROOLS_BY_PARAMS_FAILED,
                     this, controllerName, sessionName, queryName, queriedEntity, queryParameters, e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
                     .entity(new Error(
-                            controllerName + ":" + sessionName + ":" + queryName + queriedEntity + " not acceptable"))
+                            controllerName + ":" + sessionName + ":" + queryName + queriedEntity + NOT_ACCEPTABLE_MSG))
                     .build();
         } catch (final Exception e) {
             logger.debug(
-                    "{}: cannot get: drools-controller {}, session {}, query {}, entity {}, params {} because of {}",
+                    FETCH_DROOLS_BY_PARAMS_FAILED,
                     this, controllerName, sessionName, queryName, queriedEntity, queryParameters, e.getMessage(), e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(new Error(e.getMessage())).build();
         }
@@ -1002,17 +1055,18 @@ public class RestManager {
             final List<Object> facts = drools.facts(sessionName, factType, true);
             return Response.status(Response.Status.OK).entity(facts).build();
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get: drools-controller {}, session {}, factType {}, because of {}", this,
+            logger.debug(FETCH_DROOLS_BY_FACTTYPE_FAILED, this,
                     controllerName, sessionName, factType, e.getMessage(), e);
             return Response.status(Response.Status.NOT_FOUND)
-                    .entity(new Error(controllerName + ":" + sessionName + ":" + factType + " not found")).build();
+                    .entity(new Error(controllerName + ":" + sessionName + ":" + factType + NOT_FOUND_MSG)).build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get: drools-controller {}, session {}, factType {}, because of {}", this,
-                    controllerName, sessionName, factType, e.getMessage(), e);
+            logger.debug(FETCH_DROOLS_BY_FACTTYPE_FAILED, this,
+                            controllerName, sessionName, factType, e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
-                    .entity(new Error(controllerName + ":" + sessionName + ":" + factType + " not acceptable")).build();
+                            .entity(new Error(controllerName + ":" + sessionName + ":" + factType + NOT_ACCEPTABLE_MSG))
+                            .build();
         } catch (final Exception e) {
-            logger.debug("{}: cannot get: drools-controller {}, session {}, factType {}, because of {}", this,
+            logger.debug(FETCH_DROOLS_BY_FACTTYPE_FAILED, this,
                     controllerName, sessionName, factType, e.getMessage(), e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(new Error(e.getMessage())).build();
         }
@@ -1054,23 +1108,23 @@ public class RestManager {
             return Response.status(Response.Status.OK).entity(facts).build();
         } catch (final IllegalArgumentException e) {
             logger.debug(
-                    "{}: cannot get: drools-controller {}, session {}, query {}, entity {}, params {} because of {}",
+                    FETCH_DROOLS_BY_PARAMS_FAILED,
                     this, controllerName, sessionName, queryName, queriedEntity, queryParameters, e.getMessage(), e);
             return Response.status(Response.Status.NOT_FOUND)
                     .entity(new Error(
-                            controllerName + ":" + sessionName + ":" + queryName + queriedEntity + " not found"))
+                            controllerName + ":" + sessionName + ":" + queryName + queriedEntity + NOT_FOUND_MSG))
                     .build();
         } catch (final IllegalStateException e) {
             logger.debug(
-                    "{}: cannot get: drools-controller {}, session {}, query {}, entity {}, params {} because of {}",
+                    FETCH_DROOLS_BY_PARAMS_FAILED,
                     this, controllerName, sessionName, queryName, queriedEntity, queryParameters, e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
                     .entity(new Error(
-                            controllerName + ":" + sessionName + ":" + queryName + queriedEntity + " not acceptable"))
+                            controllerName + ":" + sessionName + ":" + queryName + queriedEntity + NOT_ACCEPTABLE_MSG))
                     .build();
         } catch (final Exception e) {
             logger.debug(
-                    "{}: cannot get: drools-controller {}, session {}, query {}, entity {}, params {} because of {}",
+                    FETCH_DROOLS_BY_PARAMS_FAILED,
                     this, controllerName, sessionName, queryName, queriedEntity, queryParameters, e.getMessage(), e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(new Error(e.getMessage())).build();
         }
@@ -1111,17 +1165,17 @@ public class RestManager {
         try {
             final DroolsController drools = this.getDroolsController(controllerName);
             final List<ProtocolCoderToolset> decoders =
-                    EventProtocolCoder.manager.getDecoders(drools.getGroupId(), drools.getArtifactId());
+                    EventProtocolCoderConstants.getManager().getDecoders(drools.getGroupId(), drools.getArtifactId());
             return Response.status(Response.Status.OK).entity(decoders).build();
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get decoders for policy-controller {} because of {}", this, controllerName,
+            logger.debug(FETCH_DECODERS_BY_POLICY_FAILED, this, controllerName,
                     e.getMessage(), e);
-            return Response.status(Response.Status.NOT_FOUND).entity(new Error(controllerName + " not found")).build();
+            return Response.status(Response.Status.NOT_FOUND).entity(new Error(controllerName + NOT_FOUND_MSG)).build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get decoders for policy-controller {} because of {}", this, controllerName,
-                    e.getMessage(), e);
-            return Response.status(Response.Status.NOT_ACCEPTABLE).entity(new Error(controllerName + " not acceptable"))
-                    .build();
+            logger.debug(FETCH_DECODERS_BY_POLICY_FAILED, this, controllerName,
+                            e.getMessage(), e);
+            return Response.status(Response.Status.NOT_ACCEPTABLE)
+                            .entity(new Error(controllerName + NOT_ACCEPTABLE_MSG)).build();
         }
     }
 
@@ -1146,18 +1200,18 @@ public class RestManager {
             required = true) @PathParam("controller") String controllerName) {
         try {
             final DroolsController drools = this.getDroolsController(controllerName);
-            final List<CoderFilters> filters =
-                    EventProtocolCoder.manager.getDecoderFilters(drools.getGroupId(), drools.getArtifactId());
+            final List<CoderFilters> filters = EventProtocolCoderConstants.getManager()
+                            .getDecoderFilters(drools.getGroupId(), drools.getArtifactId());
             return Response.status(Response.Status.OK).entity(filters).build();
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get decoders for policy-controller {} because of {}", this, controllerName,
+            logger.debug(FETCH_DECODERS_BY_POLICY_FAILED, this, controllerName,
                     e.getMessage(), e);
-            return Response.status(Response.Status.NOT_FOUND).entity(new Error(controllerName + " not found")).build();
+            return Response.status(Response.Status.NOT_FOUND).entity(new Error(controllerName + NOT_FOUND_MSG)).build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get decoders for policy-controller {} because of {}", this, controllerName,
-                    e.getMessage(), e);
-            return Response.status(Response.Status.NOT_ACCEPTABLE).entity(new Error(controllerName + " not acceptable"))
-                    .build();
+            logger.debug(FETCH_DECODERS_BY_POLICY_FAILED, this, controllerName,
+                            e.getMessage(), e);
+            return Response.status(Response.Status.NOT_ACCEPTABLE)
+                            .entity(new Error(controllerName + NOT_ACCEPTABLE_MSG)).build();
         }
     }
 
@@ -1182,19 +1236,19 @@ public class RestManager {
             @ApiParam(value = "Networked Topic Name", required = true) @PathParam("topic") String topic) {
         try {
             final DroolsController drools = this.getDroolsController(controllerName);
-            final ProtocolCoderToolset decoder =
-                    EventProtocolCoder.manager.getDecoders(drools.getGroupId(), drools.getArtifactId(), topic);
+            final ProtocolCoderToolset decoder = EventProtocolCoderConstants.getManager()
+                            .getDecoders(drools.getGroupId(), drools.getArtifactId(), topic);
             return Response.status(Response.Status.OK).entity(decoder).build();
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get decoders for policy-controller {} topic {} because of {}", this,
+            logger.debug(FETCH_DECODERS_BY_TOPIC_FAILED, this,
                     controllerName, topic, e.getMessage(), e);
             return Response.status(Response.Status.NOT_FOUND)
-                    .entity(new Error(controllerName + ":" + topic + " not found")).build();
+                    .entity(new Error(controllerName + ":" + topic + NOT_FOUND_MSG)).build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get decoders for policy-controller {} topic {} because of {}", this,
+            logger.debug(FETCH_DECODERS_BY_TOPIC_FAILED, this,
                     controllerName, topic, e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
-                    .entity(new Error(controllerName + ":" + topic + " not acceptable")).build();
+                    .entity(new Error(controllerName + ":" + topic + NOT_ACCEPTABLE_MSG)).build();
         }
     }
 
@@ -1220,24 +1274,24 @@ public class RestManager {
             @ApiParam(value = "Networked Topic Name", required = true) @PathParam("topic") String topic) {
         try {
             final DroolsController drools = this.getDroolsController(controllerName);
-            final ProtocolCoderToolset decoder =
-                    EventProtocolCoder.manager.getDecoders(drools.getGroupId(), drools.getArtifactId(), topic);
+            final ProtocolCoderToolset decoder = EventProtocolCoderConstants.getManager()
+                            .getDecoders(drools.getGroupId(), drools.getArtifactId(), topic);
             if (decoder == null) {
-                return Response.status(Response.Status.BAD_REQUEST).entity(new Error(topic + "  does not exist"))
+                return Response.status(Response.Status.BAD_REQUEST).entity(new Error(topic + DOES_NOT_EXIST_MSG))
                         .build();
             } else {
                 return Response.status(Response.Status.OK).entity(decoder.getCoders()).build();
             }
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get decoders for policy-controller {} topic {} because of {}", this,
+            logger.debug(FETCH_DECODERS_BY_TOPIC_FAILED, this,
                     controllerName, topic, e.getMessage(), e);
             return Response.status(Response.Status.NOT_FOUND)
-                    .entity(new Error(controllerName + ":" + topic + " not found")).build();
+                    .entity(new Error(controllerName + ":" + topic + NOT_FOUND_MSG)).build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get decoders for policy-controller {} topic {} because of {}", this,
+            logger.debug(FETCH_DECODERS_BY_TOPIC_FAILED, this,
                     controllerName, topic, e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
-                    .entity(new Error(controllerName + ":" + topic + " not acceptable")).build();
+                    .entity(new Error(controllerName + ":" + topic + NOT_ACCEPTABLE_MSG)).build();
         }
     }
 
@@ -1264,25 +1318,25 @@ public class RestManager {
             @ApiParam(value = "Fact Type", required = true) @PathParam("factType") String factClass) {
         try {
             final DroolsController drools = this.getDroolsController(controllerName);
-            final ProtocolCoderToolset decoder =
-                    EventProtocolCoder.manager.getDecoders(drools.getGroupId(), drools.getArtifactId(), topic);
+            final ProtocolCoderToolset decoder = EventProtocolCoderConstants.getManager()
+                            .getDecoders(drools.getGroupId(), drools.getArtifactId(), topic);
             final CoderFilters filters = decoder.getCoder(factClass);
             if (filters == null) {
                 return Response.status(Response.Status.BAD_REQUEST)
-                        .entity(new Error(topic + ":" + factClass + "  does not exist")).build();
+                        .entity(new Error(topic + ":" + factClass + DOES_NOT_EXIST_MSG)).build();
             } else {
                 return Response.status(Response.Status.OK).entity(filters).build();
             }
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get decoder filters for policy-controller {} topic {} type {} because of {}", this,
+            logger.debug(FETCH_DECODER_BY_TYPE_FAILED, this,
                     controllerName, topic, factClass, e.getMessage(), e);
             return Response.status(Response.Status.NOT_FOUND)
-                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + " not found")).build();
+                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + NOT_FOUND_MSG)).build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get decoder filters for policy-controller {} topic {} type {} because of {}", this,
+            logger.debug(FETCH_DECODER_BY_TYPE_FAILED, this,
                     controllerName, topic, factClass, e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
-                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + " not acceptable")).build();
+                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + NOT_ACCEPTABLE_MSG)).build();
         }
     }
 
@@ -1318,27 +1372,27 @@ public class RestManager {
 
         try {
             final DroolsController drools = this.getDroolsController(controllerName);
-            final ProtocolCoderToolset decoder =
-                    EventProtocolCoder.manager.getDecoders(drools.getGroupId(), drools.getArtifactId(), topic);
+            final ProtocolCoderToolset decoder = EventProtocolCoderConstants.getManager()
+                            .getDecoders(drools.getGroupId(), drools.getArtifactId(), topic);
             final CoderFilters filters = decoder.getCoder(factClass);
             if (filters == null) {
                 return Response.status(Response.Status.BAD_REQUEST)
-                        .entity(new Error(topic + ":" + factClass + "  does not exist")).build();
+                        .entity(new Error(topic + ":" + factClass + DOES_NOT_EXIST_MSG)).build();
             }
             filters.setFilter(configFilters);
             return Response.status(Response.Status.OK).entity(filters).build();
         } catch (final IllegalArgumentException e) {
             logger.debug(
-                    "{}: cannot get decoder filters for policy-controller {} topic {} type {} filters {} because of {}",
+                    FETCH_DECODER_BY_FILTER_FAILED,
                     this, controllerName, topic, factClass, configFilters, e.getMessage(), e);
             return Response.status(Response.Status.NOT_FOUND)
-                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + " not found")).build();
+                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + NOT_FOUND_MSG)).build();
         } catch (final IllegalStateException e) {
             logger.debug(
-                    "{}: cannot get decoder filters for policy-controller {} topic {} type {} filters {} because of {}",
+                    FETCH_DECODER_BY_FILTER_FAILED,
                     this, controllerName, topic, factClass, configFilters, e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
-                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + " not acceptable")).build();
+                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + NOT_ACCEPTABLE_MSG)).build();
         }
     }
 
@@ -1363,32 +1417,32 @@ public class RestManager {
             @ApiParam(value = "Fact Type", required = true) @PathParam("factType") String factClass) {
         try {
             final DroolsController drools = this.getDroolsController(controllerName);
-            final ProtocolCoderToolset decoder =
-                    EventProtocolCoder.manager.getDecoders(drools.getGroupId(), drools.getArtifactId(), topic);
+            final ProtocolCoderToolset decoder = EventProtocolCoderConstants.getManager()
+                            .getDecoders(drools.getGroupId(), drools.getArtifactId(), topic);
 
             final CoderFilters filters = decoder.getCoder(factClass);
             if (filters == null) {
                 return Response.status(Response.Status.BAD_REQUEST)
-                        .entity(new Error(controllerName + ":" + topic + ":" + factClass + "  does not exist")).build();
+                        .entity(new Error(controllerName + ":" + topic + ":" + factClass + DOES_NOT_EXIST_MSG)).build();
             }
 
             final JsonProtocolFilter filter = filters.getFilter();
             if (filter == null) {
                 return Response.status(Response.Status.BAD_REQUEST)
-                        .entity(new Error(controllerName + ":" + topic + ":" + factClass + "  no filters")).build();
+                        .entity(new Error(controllerName + ":" + topic + ":" + factClass + NO_FILTERS)).build();
             }
 
             return Response.status(Response.Status.OK).entity(filter.getRule()).build();
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get decoder filters for policy-controller {} topic {} type {} because of {}", this,
+            logger.debug(FETCH_DECODER_BY_TYPE_FAILED, this,
                     controllerName, topic, factClass, e.getMessage(), e);
             return Response.status(Response.Status.NOT_FOUND)
-                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + " not found")).build();
+                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + NOT_FOUND_MSG)).build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get decoder filters for policy-controller {} topic {} type {} because of {}", this,
+            logger.debug(FETCH_DECODER_BY_TYPE_FAILED, this,
                     controllerName, topic, factClass, e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
-                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + " not acceptable")).build();
+                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + NOT_ACCEPTABLE_MSG)).build();
         }
     }
 
@@ -1415,37 +1469,37 @@ public class RestManager {
 
         try {
             final DroolsController drools = this.getDroolsController(controllerName);
-            final ProtocolCoderToolset decoder =
-                    EventProtocolCoder.manager.getDecoders(drools.getGroupId(), drools.getArtifactId(), topic);
+            final ProtocolCoderToolset decoder = EventProtocolCoderConstants.getManager()
+                            .getDecoders(drools.getGroupId(), drools.getArtifactId(), topic);
 
             final CoderFilters filters = decoder.getCoder(factClass);
             if (filters == null) {
                 return Response.status(Response.Status.BAD_REQUEST)
-                        .entity(new Error(controllerName + ":" + topic + ":" + factClass + "  does not exist")).build();
+                        .entity(new Error(controllerName + ":" + topic + ":" + factClass + DOES_NOT_EXIST_MSG)).build();
             }
 
             final JsonProtocolFilter filter = filters.getFilter();
             if (filter == null) {
                 return Response.status(Response.Status.BAD_REQUEST)
-                        .entity(new Error(controllerName + ":" + topic + ":" + factClass + "  no filters")).build();
+                        .entity(new Error(controllerName + ":" + topic + ":" + factClass + NO_FILTERS)).build();
             }
 
             filter.setRule(null);
             return Response.status(Response.Status.OK).entity(filter.getRule()).build();
         } catch (final IllegalArgumentException e) {
             logger.debug(
-                    "{}: cannot get decoder filters for policy-controller {} topic {} type {} because of {}",
+                    FETCH_DECODER_BY_TYPE_FAILED,
                     this, controllerName, topic, factClass, e.getMessage(), e);
             return Response.status(Response.Status.NOT_FOUND)
-                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + " not found"))
+                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + NOT_FOUND_MSG))
                     .build();
         } catch (final IllegalStateException e) {
             logger.debug(
-                    "{}: cannot get decoder filters for policy-controller {} topic {} type {} because of {}",
+                    FETCH_DECODER_BY_TYPE_FAILED,
                     this, controllerName, topic, factClass, e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
                     .entity(new Error(
-                            controllerName + ":" + topic + ":" + factClass + " not acceptable"))
+                            controllerName + ":" + topic + ":" + factClass + NOT_ACCEPTABLE_MSG))
                     .build();
         }
     }
@@ -1473,19 +1527,19 @@ public class RestManager {
 
         try {
             final DroolsController drools = this.getDroolsController(controllerName);
-            final ProtocolCoderToolset decoder =
-                    EventProtocolCoder.manager.getDecoders(drools.getGroupId(), drools.getArtifactId(), topic);
+            final ProtocolCoderToolset decoder = EventProtocolCoderConstants.getManager()
+                            .getDecoders(drools.getGroupId(), drools.getArtifactId(), topic);
 
             final CoderFilters filters = decoder.getCoder(factClass);
             if (filters == null) {
                 return Response.status(Response.Status.BAD_REQUEST)
-                        .entity(new Error(controllerName + ":" + topic + ":" + factClass + "  does not exist")).build();
+                        .entity(new Error(controllerName + ":" + topic + ":" + factClass + DOES_NOT_EXIST_MSG)).build();
             }
 
             final JsonProtocolFilter filter = filters.getFilter();
             if (filter == null) {
                 return Response.status(Response.Status.BAD_REQUEST)
-                        .entity(new Error(controllerName + ":" + topic + ":" + factClass + "  no filters")).build();
+                        .entity(new Error(controllerName + ":" + topic + ":" + factClass + NO_FILTERS)).build();
             }
 
             if (rule == null || rule.isEmpty()) {
@@ -1501,14 +1555,14 @@ public class RestManager {
                             + "topic {} type {} because of {}",
                             this, controllerName, topic, factClass, e.getMessage(), e);
             return Response.status(Response.Status.NOT_FOUND)
-                    .entity(new Error(controllerName + ":" + topic + " not found")).build();
+                    .entity(new Error(controllerName + ":" + topic + NOT_FOUND_MSG)).build();
         } catch (final IllegalStateException e) {
             logger.debug(
                     "{}: cannot access decoder filter rules for policy-controller {} "
                             + "topic {} type {} because of {}",
                             this, controllerName, topic, factClass, e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
-                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + " not acceptable")).build();
+                    .entity(new Error(controllerName + ":" + topic + ":" + factClass + NOT_ACCEPTABLE_MSG)).build();
         }
     }
 
@@ -1532,17 +1586,17 @@ public class RestManager {
 
         PolicyController policyController;
         try {
-            policyController = PolicyController.factory.get(controllerName);
+            policyController = PolicyControllerConstants.getFactory().get(controllerName);
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get decoders for policy-controller {} topic {} because of {}", this,
+            logger.debug(FETCH_DECODERS_BY_TOPIC_FAILED, this,
                     controllerName, topic, e.getMessage(), e);
             return Response.status(Response.Status.NOT_FOUND)
-                    .entity(new Error(controllerName + ":" + topic + ":" + " not found")).build();
+                    .entity(new Error(controllerName + ":" + topic + ":" + NOT_FOUND_MSG)).build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get decoders for policy-controller {} topic {} because of {}", this,
+            logger.debug(FETCH_DECODERS_BY_TOPIC_FAILED, this,
                     controllerName, topic, e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
-                    .entity(new Error(controllerName + ":" + topic + ":" + " not acceptable")).build();
+                    .entity(new Error(controllerName + ":" + topic + ":" + NOT_ACCEPTABLE_MSG)).build();
         }
 
         final CodingResult result = new CodingResult();
@@ -1552,17 +1606,17 @@ public class RestManager {
 
         Object event;
         try {
-            event = EventProtocolCoder.manager.decode(policyController.getDrools().getGroupId(),
+            event = EventProtocolCoderConstants.getManager().decode(policyController.getDrools().getGroupId(),
                     policyController.getDrools().getArtifactId(), topic, json);
             result.setDecoding(true);
         } catch (final Exception e) {
-            logger.debug("{}: cannot get policy-controller {} topic {} because of {}", this, controllerName, topic,
+            logger.debug(FETCH_POLICY_BY_TOPIC_FAILED, this, controllerName, topic,
                     e.getMessage(), e);
             return Response.status(Response.Status.BAD_REQUEST).entity(new Error(e.getMessage())).build();
         }
 
         try {
-            result.setJsonEncoding(EventProtocolCoder.manager.encode(topic, event));
+            result.setJsonEncoding(EventProtocolCoderConstants.getManager().encode(topic, event));
             result.setEncoding(true);
         } catch (final Exception e) {
             // continue so to propagate decoding results ..
@@ -1589,16 +1643,17 @@ public class RestManager {
             required = true) @PathParam("controller") String controllerName) {
         List<CoderFilters> encoders;
         try {
-            final PolicyController controller = PolicyController.factory.get(controllerName);
+            final PolicyController controller = PolicyControllerConstants.getFactory().get(controllerName);
             final DroolsController drools = controller.getDrools();
-            encoders = EventProtocolCoder.manager.getEncoderFilters(drools.getGroupId(), drools.getArtifactId());
+            encoders = EventProtocolCoderConstants.getManager().getEncoderFilters(drools.getGroupId(),
+                            drools.getArtifactId());
         } catch (final IllegalArgumentException e) {
-            logger.debug("{}: cannot get encoder filters for policy-controller {} because of {}", this, controllerName,
+            logger.debug(FETCH_ENCODER_BY_FILTER_FAILED, this, controllerName,
                     e.getMessage(), e);
             return Response.status(Response.Status.BAD_REQUEST)
-                    .entity(new Error(controllerName + " not found: " + e.getMessage())).build();
+                    .entity(new Error(controllerName + NOT_FOUND + e.getMessage())).build();
         } catch (final IllegalStateException e) {
-            logger.debug("{}: cannot get encoder filters for policy-controller {} because of {}", this, controllerName,
+            logger.debug(FETCH_ENCODER_BY_FILTER_FAILED, this, controllerName,
                     e.getMessage(), e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
                     .entity(new Error(controllerName + " is not accepting the request")).build();
@@ -1620,7 +1675,7 @@ public class RestManager {
     @ApiOperation(value = "Topics Control Switches", notes = "List of the Topic Control Switches",
             responseContainer = "List")
     public Response topicSwitches() {
-        return Response.status(Response.Status.OK).entity(Arrays.asList(Switches.values())).build();
+        return Response.status(Response.Status.OK).entity(SWITCHES).build();
     }
 
     /**
@@ -1639,7 +1694,7 @@ public class RestManager {
         if (success) {
             return Response.status(Status.OK).entity(TopicEndpointManager.getManager()).build();
         } else {
-            return Response.status(Status.NOT_ACCEPTABLE).entity(new Error("cannot perform operation")).build();
+            return Response.status(Status.NOT_ACCEPTABLE).entity(new Error(CANNOT_PERFORM_OPERATION)).build();
         }
     }
 
@@ -1659,7 +1714,7 @@ public class RestManager {
         if (success) {
             return Response.status(Status.OK).entity(TopicEndpointManager.getManager()).build();
         } else {
-            return Response.status(Status.NOT_ACCEPTABLE).entity(new Error("cannot perform operation")).build();
+            return Response.status(Status.NOT_ACCEPTABLE).entity(new Error(CANNOT_PERFORM_OPERATION)).build();
         }
     }
 
@@ -1832,7 +1887,7 @@ public class RestManager {
     public Response commSourceTopicSwitches(
         @ApiParam(value = "Communication Mechanism", required = true) @PathParam("comm") String comm
     ) {
-        return Response.status(Response.Status.OK).entity(Arrays.asList(Switches.values())).build();
+        return Response.status(Response.Status.OK).entity(SWITCHES).build();
     }
 
     /**
@@ -1845,7 +1900,7 @@ public class RestManager {
     public Response commSinkTopicSwitches(
         @ApiParam(value = "Communication Mechanism", required = true) @PathParam("comm") String comm
     ) {
-        return Response.status(Response.Status.OK).entity(Arrays.asList(Switches.values())).build();
+        return Response.status(Response.Status.OK).entity(SWITCHES).build();
     }
 
     /**
@@ -2028,9 +2083,13 @@ public class RestManager {
                     .build();
             }
         } catch (IllegalArgumentException e) {
+            logger.debug("{}: cannot offer to topic {} because of {}", this, topic, e.getMessage(),
+                            e);
             return Response.status(Response.Status.NOT_FOUND)
-                    .entity(new Error(topic + " not found")).build();
+                    .entity(new Error(topic + NOT_FOUND_MSG)).build();
         } catch (IllegalStateException e) {
+            logger.debug("{}: cannot offer to topic {} because of {}", this, topic, e.getMessage(),
+                            e);
             return Response.status(Response.Status.NOT_ACCEPTABLE)
                     .entity(new Error(topic + " not acceptable due to current state"))
                     .build();
@@ -2144,14 +2203,14 @@ public class RestManager {
      * @throws IllegalArgumentException if an invalid controller name has been passed in
      */
     protected DroolsController getDroolsController(String controllerName) {
-        final PolicyController controller = PolicyController.factory.get(controllerName);
+        final PolicyController controller = PolicyControllerConstants.getFactory().get(controllerName);
         if (controller == null) {
-            throw new IllegalArgumentException(controllerName + "  does not exist");
+            throw new IllegalArgumentException(controllerName + DOES_NOT_EXIST_MSG);
         }
 
         final DroolsController drools = controller.getDrools();
         if (drools == null) {
-            throw new IllegalArgumentException(controllerName + "  has no drools configuration");
+            throw new IllegalArgumentException(controllerName + " has no drools configuration");
         }
 
         return drools;
@@ -2229,19 +2288,5 @@ public class RestManager {
             this.msg = msg;
         }
     }
-
-    /**
-     * Feed Ports into Resources.
-     */
-    public enum Inputs {
-        configuration,
-    }
-
-    /**
-     * Resource Toggles.
-     */
-    public enum Switches {
-        activation, lock,
-    }
 }
 
diff --git a/policy-management/src/main/java/org/onap/policy/drools/server/restful/aaf/AafBase.java b/policy-management/src/main/java/org/onap/policy/drools/server/restful/aaf/AafBase.java
index 955fb242..67725955 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/server/restful/aaf/AafBase.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/server/restful/aaf/AafBase.java
@@ -2,7 +2,7 @@
  * ============LICENSE_START=======================================================
  * ONAP
  * ================================================================================
- * Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
+ * Copyright (C) 2018-2019 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.
@@ -21,7 +21,7 @@
 package org.onap.policy.drools.server.restful.aaf;
 
 import org.onap.policy.common.endpoints.http.server.aaf.AafAuthFilter;
-import org.onap.policy.drools.system.PolicyEngine;
+import org.onap.policy.drools.system.PolicyEngineConstants;
 
 /**
  * AAF Base Class.
@@ -30,6 +30,6 @@ public abstract class AafBase extends AafAuthFilter {
     public static final String AAF_NODETYPE = "pdpd";
     public static final String AAF_ROOT_PERMISSION_PROPERTY = "aaf.root.permission";
     public static final String AAF_ROOT_PERMISSION =
-        PolicyEngine.manager.getProperties().getProperty(
+        PolicyEngineConstants.getManager().getProperties().getProperty(
                 AAF_ROOT_PERMISSION_PROPERTY, DEFAULT_NAMESPACE + "." + AAF_NODETYPE);
 }
diff --git a/policy-management/src/main/java/org/onap/policy/drools/system/IndexedPolicyControllerFactory.java b/policy-management/src/main/java/org/onap/policy/drools/system/IndexedPolicyControllerFactory.java
index 38085101..0d7806c6 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/system/IndexedPolicyControllerFactory.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/system/IndexedPolicyControllerFactory.java
@@ -29,6 +29,7 @@ import java.util.Properties;
 import org.onap.policy.common.gson.annotation.GsonJsonIgnore;
 import org.onap.policy.drools.controller.DroolsController;
 import org.onap.policy.drools.features.PolicyControllerFeatureApi;
+import org.onap.policy.drools.features.PolicyControllerFeatureApiConstants;
 import org.onap.policy.drools.protocol.configuration.DroolsConfiguration;
 import org.onap.policy.drools.system.internal.AggregatedPolicyController;
 import org.slf4j.Logger;
@@ -382,6 +383,6 @@ class IndexedPolicyControllerFactory implements PolicyControllerFactory {
     }
 
     protected List<PolicyControllerFeatureApi> getProviders() {
-        return PolicyControllerFeatureApi.providers.getList();
+        return PolicyControllerFeatureApiConstants.getProviders().getList();
     }
 }
diff --git a/policy-management/src/main/java/org/onap/policy/drools/system/Main.java b/policy-management/src/main/java/org/onap/policy/drools/system/Main.java
index 11ffd689..1ef578c1 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/system/Main.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/system/Main.java
@@ -22,8 +22,8 @@ package org.onap.policy.drools.system;
 
 import java.util.Properties;
 import org.onap.policy.common.endpoints.event.comm.TopicEndpointManager;
-import org.onap.policy.drools.persistence.SystemPersistence;
-import org.onap.policy.drools.properties.DroolsProperties;
+import org.onap.policy.drools.persistence.SystemPersistenceConstants;
+import org.onap.policy.drools.properties.DroolsPropertyConstants;
 import org.onap.policy.drools.utils.PropertyUtil;
 import org.onap.policy.drools.utils.logging.LoggerUtil;
 import org.onap.policy.drools.utils.logging.MdcTransaction;
@@ -51,35 +51,35 @@ public class Main {
 
         /* system properties */
 
-        for (Properties systemProperties : SystemPersistence.manager.getSystemProperties()) {
+        for (Properties systemProperties : SystemPersistenceConstants.getManager().getSystemProperties()) {
             PropertyUtil.setSystemProperties(systemProperties);
         }
 
         /* 0. boot */
 
-        PolicyEngine.manager.boot(args);
+        PolicyEngineConstants.getManager().boot(args);
 
         /* 1.a. Configure Engine */
 
         Properties engineProperties;
         try {
-            engineProperties = SystemPersistence.manager.getEngineProperties();
+            engineProperties = SystemPersistenceConstants.getManager().getEngineProperties();
         } catch (IllegalArgumentException iae) {
             logger.warn("Main: engine properties not found.  Using default configuration.", iae);
-            engineProperties = PolicyEngine.manager.defaultTelemetryConfig();
+            engineProperties = PolicyEngineConstants.getManager().defaultTelemetryConfig();
         }
 
-        PolicyEngine.manager.configure(engineProperties);
+        PolicyEngineConstants.getManager().configure(engineProperties);
 
         /* 1.b. Load Installation Environment(s) */
 
-        for (Properties env : SystemPersistence.manager.getEnvironmentProperties()) {
-            PolicyEngine.manager.setEnvironment(env);
+        for (Properties env : SystemPersistenceConstants.getManager().getEnvironmentProperties()) {
+            PolicyEngineConstants.getManager().setEnvironment(env);
         }
 
         /* 2. Add topics */
 
-        for (Properties topicProperties : SystemPersistence.manager.getTopicProperties()) {
+        for (Properties topicProperties : SystemPersistenceConstants.getManager().getTopicProperties()) {
             TopicEndpointManager.getManager().addTopics(topicProperties);
         }
 
@@ -91,13 +91,13 @@ public class Main {
                 .setTargetEntity("engine")
                 .setTargetServiceName("start");
         try {
-            final boolean success = PolicyEngine.manager.start();
+            final boolean success = PolicyEngineConstants.getManager().start();
             if (!success) {
                 trans.setStatusCode(false).setResponseDescription("partial start").flush();
                 logger.warn(
                         LoggerUtil.TRANSACTION_LOG_MARKER,
                         "Main: {} has been partially started",
-                        PolicyEngine.manager);
+                        PolicyEngineConstants.getManager());
             } else {
                 trans.setStatusCode(true).transaction();
             }
@@ -110,7 +110,7 @@ public class Main {
             logger.warn(
                     LoggerUtil.TRANSACTION_LOG_MARKER,
                     "Main: cannot start {} (bad state) because of {}",
-                    PolicyEngine.manager,
+                    PolicyEngineConstants.getManager(),
                     e.getMessage(),
                     e);
         } catch (final Exception e) {
@@ -122,7 +122,7 @@ public class Main {
             logger.warn(
                     LoggerUtil.TRANSACTION_LOG_MARKER,
                     "Main: cannot start {} because of {}",
-                    PolicyEngine.manager,
+                    PolicyEngineConstants.getManager(),
                     e.getMessage(),
                     e);
             System.exit(1);
@@ -131,9 +131,9 @@ public class Main {
         /* 4. Create and start the controllers */
 
         for (final Properties controllerProperties :
-            SystemPersistence.manager.getControllerProperties()) {
+            SystemPersistenceConstants.getManager().getControllerProperties()) {
             final String controllerName =
-                    controllerProperties.getProperty(DroolsProperties.PROPERTY_CONTROLLER_NAME);
+                    controllerProperties.getProperty(DroolsPropertyConstants.PROPERTY_CONTROLLER_NAME);
             try {
                 trans =
                         MdcTransaction.newTransaction(null, null)
@@ -142,7 +142,7 @@ public class Main {
                         .setTargetServiceName("start");
 
                 final PolicyController controller =
-                        PolicyEngine.manager.createPolicyController(controllerName, controllerProperties);
+                        PolicyEngineConstants.getManager().createPolicyController(controllerName, controllerProperties);
                 controller.start();
 
                 trans
diff --git a/policy-management/src/main/java/org/onap/policy/drools/system/PolicyController.java b/policy-management/src/main/java/org/onap/policy/drools/system/PolicyController.java
index 9bc75b39..17247f41 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/system/PolicyController.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/system/PolicyController.java
@@ -7,9 +7,9 @@
  * 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.
@@ -41,11 +41,6 @@ import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyTypeIdentifi
 public interface PolicyController extends Startable, Lockable {
 
     /**
-     * Factory that tracks and manages Policy Controllers.
-     */
-    static PolicyControllerFactory factory = new IndexedPolicyControllerFactory();
-
-    /**
      * name of this Policy Controller.
      */
     String getName();
@@ -72,7 +67,7 @@ public interface PolicyController extends Startable, Lockable {
 
     /**
      * Update maven configuration.
-     * 
+     *
      * @param newDroolsConfiguration new drools configuration
      * @return true if the update was successful, false otherwise
      */
@@ -90,11 +85,11 @@ public interface PolicyController extends Startable, Lockable {
 
     /**
      * Attempts delivering of an String over communication infrastructure "busType".
-     * 
+     *
      * @param busType bus type
      * @param topic topic
      * @param event Communication infrastructure identifier
-     * 
+     *
      * @return true if successful, false if a failure has occurred.
      * @throws IllegalArgumentException when invalid or insufficient properties are provided
      * @throws IllegalStateException when the engine is in a state where this operation is not
@@ -106,7 +101,7 @@ public interface PolicyController extends Startable, Lockable {
 
     /**
      * halts and permanently releases all resources.
-     * 
+     *
      * @throws IllegalStateException throws illegal state exception
      */
     void halt();
diff --git a/policy-management/src/main/java/org/onap/policy/drools/system/PolicyControllerConstants.java b/policy-management/src/main/java/org/onap/policy/drools/system/PolicyControllerConstants.java
new file mode 100644
index 00000000..78d24129
--- /dev/null
+++ b/policy-management/src/main/java/org/onap/policy/drools/system/PolicyControllerConstants.java
@@ -0,0 +1,36 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 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.system;
+
+import lombok.Getter;
+
+public class PolicyControllerConstants {
+
+    /**
+     * Factory that tracks and manages Policy Controllers.
+     */
+    @Getter
+    private static final PolicyControllerFactory factory = new IndexedPolicyControllerFactory();
+
+    private PolicyControllerConstants() {
+        // do nothing
+    }
+}
diff --git a/policy-management/src/main/java/org/onap/policy/drools/system/PolicyEngine.java b/policy-management/src/main/java/org/onap/policy/drools/system/PolicyEngine.java
index eb2ed3df..506474cb 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/system/PolicyEngine.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/system/PolicyEngine.java
@@ -46,25 +46,6 @@ import org.onap.policy.drools.protocol.configuration.PdpdConfiguration;
  * RestTopicWriter <br> PolicyEngine 1 --- 1 ManagementServer
  */
 public interface PolicyEngine extends Startable, Lockable, TopicListener {
-    /**
-     * Policy Engine Manager.
-     */
-    PolicyEngine manager = new PolicyEngineManager();
-
-    /**
-     * Default Telemetry Server Port.
-     */
-    int TELEMETRY_SERVER_DEFAULT_PORT = 9696;
-
-    /**
-     * Default Telemetry Server Hostname.
-     */
-    String TELEMETRY_SERVER_DEFAULT_HOST = "localhost";
-
-    /**
-     * Default Telemetry Server Name.
-     */
-    String TELEMETRY_SERVER_DEFAULT_NAME = "TELEMETRY";
 
     /**
      * Boot the engine.
diff --git a/policy-management/src/main/java/org/onap/policy/drools/system/PolicyEngineConstants.java b/policy-management/src/main/java/org/onap/policy/drools/system/PolicyEngineConstants.java
new file mode 100644
index 00000000..4d18d6b8
--- /dev/null
+++ b/policy-management/src/main/java/org/onap/policy/drools/system/PolicyEngineConstants.java
@@ -0,0 +1,51 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * policy-management
+ * ================================================================================
+ * Copyright (C) 2019 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.system;
+
+import lombok.Getter;
+
+public class PolicyEngineConstants {
+
+    /**
+     * Default Telemetry Server Port.
+     */
+    public static final int TELEMETRY_SERVER_DEFAULT_PORT = 9696;
+
+    /**
+     * Default Telemetry Server Hostname.
+     */
+    public static final String TELEMETRY_SERVER_DEFAULT_HOST = "localhost";
+
+    /**
+     * Default Telemetry Server Name.
+     */
+    public static final String TELEMETRY_SERVER_DEFAULT_NAME = "TELEMETRY";
+
+    /**
+     * Policy Engine Manager.
+     */
+    @Getter
+    private static final PolicyEngine manager = new PolicyEngineManager();
+
+    private PolicyEngineConstants() {
+        // do nothing
+    }
+}
diff --git a/policy-management/src/main/java/org/onap/policy/drools/system/PolicyEngineManager.java b/policy-management/src/main/java/org/onap/policy/drools/system/PolicyEngineManager.java
index 1c02d705..36d8ca59 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/system/PolicyEngineManager.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/system/PolicyEngineManager.java
@@ -20,6 +20,10 @@
 
 package org.onap.policy.drools.system;
 
+import static org.onap.policy.drools.system.PolicyEngineConstants.TELEMETRY_SERVER_DEFAULT_HOST;
+import static org.onap.policy.drools.system.PolicyEngineConstants.TELEMETRY_SERVER_DEFAULT_NAME;
+import static org.onap.policy.drools.system.PolicyEngineConstants.TELEMETRY_SERVER_DEFAULT_PORT;
+
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.google.gson.Gson;
@@ -40,13 +44,18 @@ import org.onap.policy.common.endpoints.properties.PolicyEndPointProperties;
 import org.onap.policy.common.gson.annotation.GsonJsonIgnore;
 import org.onap.policy.common.gson.annotation.GsonJsonProperty;
 import org.onap.policy.drools.controller.DroolsController;
+import org.onap.policy.drools.controller.DroolsControllerConstants;
 import org.onap.policy.drools.core.PolicyContainer;
 import org.onap.policy.drools.core.jmx.PdpJmxListener;
 import org.onap.policy.drools.features.PolicyControllerFeatureApi;
+import org.onap.policy.drools.features.PolicyControllerFeatureApiConstants;
 import org.onap.policy.drools.features.PolicyEngineFeatureApi;
+import org.onap.policy.drools.features.PolicyEngineFeatureApiConstants;
 import org.onap.policy.drools.persistence.SystemPersistence;
-import org.onap.policy.drools.properties.DroolsProperties;
+import org.onap.policy.drools.persistence.SystemPersistenceConstants;
+import org.onap.policy.drools.properties.DroolsPropertyConstants;
 import org.onap.policy.drools.protocol.coders.EventProtocolCoder;
+import org.onap.policy.drools.protocol.coders.EventProtocolCoderConstants;
 import org.onap.policy.drools.protocol.configuration.ControllerConfiguration;
 import org.onap.policy.drools.protocol.configuration.PdpdConfiguration;
 import org.onap.policy.drools.server.restful.RestManager;
@@ -279,16 +288,17 @@ class PolicyEngineManager implements PolicyEngine {
                     .setTargetEntity(config.getEntity());
         }
 
-        switch (entity) {
-            case PdpdConfiguration.CONFIG_ENTITY_CONTROLLER:
-                boolean success = controllerConfig(config);
-                mdcTrans.resetSubTransaction().setStatusCode(success).transaction();
-                return success;
-            default:
-                final String msg = "Configuration Entity is not supported: " + entity;
-                mdcTrans.resetSubTransaction().setStatusCode(false).setResponseDescription(msg).flush();
-                logger.warn(LoggerUtil.TRANSACTION_LOG_MARKER_NAME, msg);
-                throw new IllegalArgumentException(msg);
+
+        if (PdpdConfiguration.CONFIG_ENTITY_CONTROLLER.equals(entity)) {
+            boolean success = controllerConfig(config);
+            mdcTrans.resetSubTransaction().setStatusCode(success).transaction();
+            return success;
+
+        } else {
+            final String msg = "Configuration Entity is not supported: " + entity;
+            mdcTrans.resetSubTransaction().setStatusCode(false).setResponseDescription(msg).flush();
+            logger.warn(LoggerUtil.TRANSACTION_LOG_MARKER_NAME, msg);
+            throw new IllegalArgumentException(msg);
         }
     }
 
@@ -299,7 +309,7 @@ class PolicyEngineManager implements PolicyEngine {
         // check if a PROPERTY_CONTROLLER_NAME property is present
         // if so, override the given name
 
-        final String propertyControllerName = properties.getProperty(DroolsProperties.PROPERTY_CONTROLLER_NAME);
+        final String propertyControllerName = properties.getProperty(DroolsPropertyConstants.PROPERTY_CONTROLLER_NAME);
         if (propertyControllerName != null && !propertyControllerName.isEmpty()) {
             if (!propertyControllerName.equals(tempName)) {
                 throw new IllegalStateException("Proposed name (" + tempName + ") and properties name ("
@@ -425,12 +435,15 @@ class PolicyEngineManager implements PolicyEngine {
                         controllerName);
 
                 /*
-                 * try to bring up bad controller in brainless mode, after having it working, apply
-                 * the new create/update operation.
+                 * try to bring up bad controller in brainless mode, after having it
+                 * working, apply the new create/update operation.
                  */
-                controllerProperties.setProperty(DroolsProperties.RULES_GROUPID, DroolsController.NO_GROUP_ID);
-                controllerProperties.setProperty(DroolsProperties.RULES_ARTIFACTID, DroolsController.NO_ARTIFACT_ID);
-                controllerProperties.setProperty(DroolsProperties.RULES_VERSION, DroolsController.NO_VERSION);
+                controllerProperties.setProperty(DroolsPropertyConstants.RULES_GROUPID,
+                                DroolsControllerConstants.NO_GROUP_ID);
+                controllerProperties.setProperty(DroolsPropertyConstants.RULES_ARTIFACTID,
+                                DroolsControllerConstants.NO_ARTIFACT_ID);
+                controllerProperties.setProperty(DroolsPropertyConstants.RULES_VERSION,
+                                DroolsControllerConstants.NO_VERSION);
 
                 policyController = getPolicyEngine().createPolicyController(controllerName, controllerProperties);
 
@@ -1272,11 +1285,11 @@ class PolicyEngineManager implements PolicyEngine {
     // these methods may be overridden by junit tests
 
     protected List<PolicyEngineFeatureApi> getEngineProviders() {
-        return PolicyEngineFeatureApi.providers.getList();
+        return PolicyEngineFeatureApiConstants.getProviders().getList();
     }
 
     protected List<PolicyControllerFeatureApi> getControllerProviders() {
-        return PolicyControllerFeatureApi.providers.getList();
+        return PolicyControllerFeatureApiConstants.getProviders().getList();
     }
 
     protected void globalInitContainer(String[] cliArgs) {
@@ -1292,7 +1305,7 @@ class PolicyEngineManager implements PolicyEngine {
     }
 
     protected PolicyControllerFactory getControllerFactory() {
-        return PolicyController.factory;
+        return PolicyControllerConstants.getFactory();
     }
 
     protected void startPdpJmxListener() {
@@ -1308,14 +1321,14 @@ class PolicyEngineManager implements PolicyEngine {
     }
 
     protected EventProtocolCoder getProtocolCoder() {
-        return EventProtocolCoder.manager;
+        return EventProtocolCoderConstants.getManager();
     }
 
     protected SystemPersistence getPersistenceManager() {
-        return SystemPersistence.manager;
+        return SystemPersistenceConstants.getManager();
     }
 
     protected PolicyEngine getPolicyEngine() {
-        return PolicyEngine.manager;
+        return PolicyEngineConstants.getManager();
     }
 }
diff --git a/policy-management/src/main/java/org/onap/policy/drools/system/internal/AggregatedPolicyController.java b/policy-management/src/main/java/org/onap/policy/drools/system/internal/AggregatedPolicyController.java
index 51280eb3..5d915104 100644
--- a/policy-management/src/main/java/org/onap/policy/drools/system/internal/AggregatedPolicyController.java
+++ b/policy-management/src/main/java/org/onap/policy/drools/system/internal/AggregatedPolicyController.java
@@ -35,10 +35,13 @@ import org.onap.policy.common.endpoints.event.comm.TopicSink;
 import org.onap.policy.common.endpoints.event.comm.TopicSource;
 import org.onap.policy.common.gson.annotation.GsonJsonIgnore;
 import org.onap.policy.drools.controller.DroolsController;
+import org.onap.policy.drools.controller.DroolsControllerConstants;
 import org.onap.policy.drools.controller.DroolsControllerFactory;
 import org.onap.policy.drools.features.PolicyControllerFeatureApi;
+import org.onap.policy.drools.features.PolicyControllerFeatureApiConstants;
 import org.onap.policy.drools.persistence.SystemPersistence;
-import org.onap.policy.drools.properties.DroolsProperties;
+import org.onap.policy.drools.persistence.SystemPersistenceConstants;
+import org.onap.policy.drools.properties.DroolsPropertyConstants;
 import org.onap.policy.drools.protocol.configuration.DroolsConfiguration;
 import org.onap.policy.drools.system.PolicyController;
 import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyTypeIdentifier;
@@ -148,14 +151,15 @@ public class AggregatedPolicyController implements PolicyController, TopicListen
         return droolsController
                 .getBaseDomainNames()
                 .stream()
-                .map(d -> new ToscaPolicyTypeIdentifier(d, DroolsProperties.DEFAULT_CONTROLLER_POLICY_TYPE_VERSION))
+                .map(d -> new ToscaPolicyTypeIdentifier(d,
+                                DroolsPropertyConstants.DEFAULT_CONTROLLER_POLICY_TYPE_VERSION))
                 .collect(Collectors.toList());
     }
 
     protected List<ToscaPolicyTypeIdentifier> getPolicyTypesFromProperties() {
         List<ToscaPolicyTypeIdentifier> policyTypeIds = new ArrayList<>();
 
-        String ptiPropValue = properties.getProperty(DroolsProperties.PROPERTY_CONTROLLER_POLICY_TYPES);
+        String ptiPropValue = properties.getProperty(DroolsPropertyConstants.PROPERTY_CONTROLLER_POLICY_TYPES);
         if (ptiPropValue == null) {
             return policyTypeIds;
         }
@@ -165,7 +169,7 @@ public class AggregatedPolicyController implements PolicyController, TopicListen
             String[] ptv = pti.split(":");
             if (ptv.length == 1) {
                 policyTypeIds.add(new ToscaPolicyTypeIdentifier(ptv[0],
-                    DroolsProperties.DEFAULT_CONTROLLER_POLICY_TYPE_VERSION));
+                    DroolsPropertyConstants.DEFAULT_CONTROLLER_POLICY_TYPE_VERSION));
             } else if (ptv.length == 2) {
                 policyTypeIds.add(new ToscaPolicyTypeIdentifier(ptv[0], ptv[1]));
             }
@@ -221,9 +225,10 @@ public class AggregatedPolicyController implements PolicyController, TopicListen
         try {
             /* Drools Controller created, update initialization properties for restarts */
 
-            this.properties.setProperty(DroolsProperties.RULES_GROUPID, newDroolsConfiguration.getGroupId());
-            this.properties.setProperty(DroolsProperties.RULES_ARTIFACTID, newDroolsConfiguration.getArtifactId());
-            this.properties.setProperty(DroolsProperties.RULES_VERSION, newDroolsConfiguration.getVersion());
+            this.properties.setProperty(DroolsPropertyConstants.RULES_GROUPID, newDroolsConfiguration.getGroupId());
+            this.properties.setProperty(DroolsPropertyConstants.RULES_ARTIFACTID,
+                            newDroolsConfiguration.getArtifactId());
+            this.properties.setProperty(DroolsPropertyConstants.RULES_VERSION, newDroolsConfiguration.getVersion());
 
             getPersistenceManager().storeController(name, this.properties);
 
@@ -719,7 +724,7 @@ public class AggregatedPolicyController implements PolicyController, TopicListen
     // the following methods may be overridden by junit tests
 
     protected SystemPersistence getPersistenceManager() {
-        return SystemPersistence.manager;
+        return SystemPersistenceConstants.getManager();
     }
 
     protected TopicEndpoint getEndpointManager() {
@@ -727,11 +732,11 @@ public class AggregatedPolicyController implements PolicyController, TopicListen
     }
 
     protected DroolsControllerFactory getDroolsFactory() {
-        return DroolsController.factory;
+        return DroolsControllerConstants.getFactory();
     }
 
     protected List<PolicyControllerFeatureApi> getProviders() {
-        return PolicyControllerFeatureApi.providers.getList();
+        return PolicyControllerFeatureApiConstants.getProviders().getList();
     }
 }
author	Jim Hahn <jrh3@att.com>	2019-08-05 15:27:16 -0400
committer	Jim Hahn <jrh3@att.com>	2019-08-13 15:58:15 -0400
commit	a156cf3cbad6512510ae9a02a13c0408f901c734 (patch)
tree	0a69bffb2a6c9f961bda1408153cf44f360c6a17 /policy-management/src/main/java/org/onap
parent	62d1ff054b0ec6348ab6f7415063fdaa3f425215 (diff)