Some changes and bug fixes for PdpMessage handling

1) Updating pom file of services-onappf to fix dependency related
issues.
2) Some changes to accomodate recent updates.
3) Fix for some issues identified during testing.

Change-Id: I8150ed9858902ebbe12321a793770df3fdc7e773
Issue-ID: POLICY-1453
Signed-off-by: a.sreekumar <ajith.sreekumar@est.tech>

5 files changed, 79 insertions, 88 deletions

diff --git a/services/services-onappf/src/main/java/org/onap/policy/apex/starter/ApexStarterActivator.java b/services/services-onappf/src/main/java/org/onap/policy/apex/starter/ApexStarterActivator.java
index a6bd702aa..b33d792a0 100644
--- a/services/services-onappf/src/main/java/org/onap/policy/apex/starter/ApexStarterActivator.java
+++ b/services/services-onappf/src/main/java/org/onap/policy/apex/starter/ApexStarterActivator.java
@@ -40,6 +40,7 @@ import org.onap.policy.common.endpoints.listeners.MessageTypeDispatcher;
 import org.onap.policy.common.utils.services.Registry;
 import org.onap.policy.common.utils.services.ServiceManager;
 import org.onap.policy.common.utils.services.ServiceManagerException;
+import org.onap.policy.models.pdp.enums.PdpMessageType;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -78,7 +79,7 @@ public class ApexStarterActivator {
         // TODO: instanceId currently set as a random string, could be fetched from actual deployment
         final int random = (int) (Math.random() * 100);
         final String instanceId = "apex_" + random;
-
+        LOGGER.debug("ApexStarterActivator initializing with instance id:" + instanceId);
         try {
             this.apexStarterParameterGroup = apexStarterParameterGroup;
             this.msgDispatcher = new MessageTypeDispatcher(MSG_TYPE_NAMES);
@@ -110,11 +111,11 @@ public class ApexStarterActivator {
                                         apexStarterParameterGroup.getPdpStatusParameters().getTimeIntervalMs())),
                         () -> stopAndRemovePdpStatusPublisher())
                 .addAction("Register pdp update listener",
-                    () -> msgDispatcher.register("PDP_UPDATE", pdpUpdateListener),
-                    () -> msgDispatcher.unregister("PDP_UPDATE"))
+                    () -> msgDispatcher.register(PdpMessageType.PDP_UPDATE.name(), pdpUpdateListener),
+                    () -> msgDispatcher.unregister(PdpMessageType.PDP_UPDATE.name()))
                 .addAction("Register pdp state change request dispatcher",
-                        () -> msgDispatcher.register("PDP_STATE_CHANGE", pdpStateChangeListener),
-                        () -> msgDispatcher.unregister("PDP_STATE_CHANGE"))
+                        () -> msgDispatcher.register(PdpMessageType.PDP_STATE_CHANGE.name(), pdpStateChangeListener),
+                        () -> msgDispatcher.unregister(PdpMessageType.PDP_STATE_CHANGE.name()))
                 .addAction("Message Dispatcher",
                     () -> registerMsgDispatcher(),
                     () -> unregisterMsgDispatcher());
diff --git a/services/services-onappf/src/main/java/org/onap/policy/apex/starter/engine/ApexEngineHandler.java b/services/services-onappf/src/main/java/org/onap/policy/apex/starter/engine/ApexEngineHandler.java
index 4682a3bc5..e58b0db76 100644
--- a/services/services-onappf/src/main/java/org/onap/policy/apex/starter/engine/ApexEngineHandler.java
+++ b/services/services-onappf/src/main/java/org/onap/policy/apex/starter/engine/ApexEngineHandler.java
@@ -20,12 +20,13 @@
 
 package org.onap.policy.apex.starter.engine;
 
+import com.google.gson.JsonObject;
+
 import java.io.IOException;
 import java.io.StringReader;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.util.Map;
 
 import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
 import org.onap.policy.apex.service.engine.main.ApexMain;
@@ -53,16 +54,15 @@ public class ApexEngineHandler {
      * @throws ApexStarterException
      */
 
-    @SuppressWarnings("unchecked")
     public ApexEngineHandler(final String properties) throws ApexStarterException {
         final StandardCoder standardCoder = new StandardCoder();
-        Map<String, Map<String, String>> body;
+        JsonObject body;
         try {
-            body = standardCoder.decode(new StringReader(properties), Map.class);
+            body = standardCoder.decode(new StringReader(properties), JsonObject.class);
         } catch (final CoderException e) {
             throw new ApexStarterException(e);
         }
-        final Map<String, String> engineServiceParameters = body.get("engineServiceParameters");
+        final JsonObject engineServiceParameters = body.get("engineServiceParameters").getAsJsonObject();
         final String policyModel = engineServiceParameters.get("policy_type_impl").toString();
         engineServiceParameters.remove("policy_type_impl");
         final String apexConfig = body.toString();
@@ -70,8 +70,8 @@ public class ApexEngineHandler {
         final String modelFilePath = createFile(policyModel, "modelFile");
 
         final String apexConfigFilePath = createFile(apexConfig, "apexConfigFile");
-
         final String[] apexArgs = { "-rfr", "target/classes", "-c", apexConfigFilePath, "-m", modelFilePath };
+        LOGGER.debug("Starting apex engine.");
         apexMain = new ApexMain(apexArgs);
     }
 
@@ -100,6 +100,7 @@ public class ApexEngineHandler {
 
     public void shutdown() throws ApexStarterException {
         try {
+            LOGGER.debug("Shutting down apex engine.");
             apexMain.shutdown();
             apexMain = null;
         } catch (final ApexException e) {
diff --git a/services/services-onappf/src/main/java/org/onap/policy/apex/starter/handler/PdpMessageHandler.java b/services/services-onappf/src/main/java/org/onap/policy/apex/starter/handler/PdpMessageHandler.java
index a022a8a08..be76938f3 100644
--- a/services/services-onappf/src/main/java/org/onap/policy/apex/starter/handler/PdpMessageHandler.java
+++ b/services/services-onappf/src/main/java/org/onap/policy/apex/starter/handler/PdpMessageHandler.java
@@ -96,12 +96,8 @@ public class PdpMessageHandler {
         pdpStatus.setDescription(pdpStatusContext.getDescription());
         pdpStatus.setSupportedPolicyTypes(pdpStatusContext.getSupportedPolicyTypes());
         pdpStatus.setPolicies(pdpStatusContext.getPolicies());
-        if (null != pdpStatusContext.getPdpGroup()) {
-            pdpStatus.setPdpGroup(pdpStatusContext.getPdpGroup());
-        }
-        if (null != pdpStatusContext.getPdpSubgroup()) {
-            pdpStatus.setPdpSubgroup(pdpStatusContext.getPdpSubgroup());
-        }
+        pdpStatus.setPdpGroup(pdpStatusContext.getPdpGroup());
+        pdpStatus.setPdpSubgroup(pdpStatusContext.getPdpSubgroup());
         return pdpStatus;
     }
 
diff --git a/services/services-onappf/src/main/java/org/onap/policy/apex/starter/handler/PdpStateChangeMessageHandler.java b/services/services-onappf/src/main/java/org/onap/policy/apex/starter/handler/PdpStateChangeMessageHandler.java
index c0ec690d8..9f97fb24b 100644
--- a/services/services-onappf/src/main/java/org/onap/policy/apex/starter/handler/PdpStateChangeMessageHandler.java
+++ b/services/services-onappf/src/main/java/org/onap/policy/apex/starter/handler/PdpStateChangeMessageHandler.java
@@ -51,11 +51,9 @@ public class PdpStateChangeMessageHandler {
         final PdpStatusPublisher pdpStatusPublisher = Registry.get(ApexStarterConstants.REG_PDP_STATUS_PUBLISHER);
         final PdpMessageHandler pdpMessageHandler = new PdpMessageHandler();
         PdpResponseDetails pdpResponseDetails = null;
-        if (isMessageRelevant(pdpStateChangeMsg, pdpStatusContext)) {
+        if (pdpStateChangeMsg.appliesTo(pdpStatusContext.getName(), pdpStatusContext.getPdpGroup(),
+                pdpStatusContext.getPdpSubgroup())) {
             switch (pdpStateChangeMsg.getState()) {
-                case TERMINATED:
-                    pdpResponseDetails = handleTerminatedState(pdpStateChangeMsg, pdpStatusContext, pdpMessageHandler);
-                    break;
                 case PASSIVE:
                     pdpResponseDetails = handlePassiveState(pdpStateChangeMsg, pdpStatusContext, pdpMessageHandler);
                     break;
@@ -67,24 +65,12 @@ public class PdpStateChangeMessageHandler {
             }
             final PdpStatus pdpStatus = pdpMessageHandler.createPdpStatusFromContext();
             pdpStatus.setResponse(pdpResponseDetails);
+            pdpStatus.setDescription("Pdp status response message for PdpStateChange");
             pdpStatusPublisher.send(pdpStatus);
         }
     }
 
     /**
-     * Check if the pdp state change message is meant for this pdp.
-     *
-     * @param pdpStateChangeMsg
-     * @param pdpStatusContext
-     * @return boolean value if relevant or not
-     */
-    private boolean isMessageRelevant(final PdpStateChange pdpStateChangeMsg, final PdpStatus pdpStatusContext) {
-        return pdpStatusContext.getName().equals(pdpStateChangeMsg.getName()) || (null == pdpStateChangeMsg.getName()
-                && pdpStateChangeMsg.getPdpGroup().equals(pdpStatusContext.getPdpGroup())
-                && pdpStateChangeMsg.getPdpSubgroup().equals(pdpStatusContext.getPdpSubgroup()));
-    }
-
-    /**
      * Method to handle when the new state from pap is active.
      *
      * @param pdpStateChangeMsg
@@ -108,7 +94,7 @@ public class PdpStateChangeMessageHandler {
                     // assumed that the apex policies list contains only one entry.
                     final ApexEngineHandler apexEngineHandler =
                             new ApexEngineHandler((String) policies.get(0).getProperties().get("content"));
-                    Registry.register(ApexStarterConstants.REG_APEX_ENGINE_HANDLER, apexEngineHandler);
+                    Registry.registerOrReplace(ApexStarterConstants.REG_APEX_ENGINE_HANDLER, apexEngineHandler);
                     pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
                             PdpResponseStatus.SUCCESS, "Apex engine started. State changed to active.");
                     pdpStatusContext.setState(PdpState.ACTIVE);
@@ -150,36 +136,4 @@ public class PdpStateChangeMessageHandler {
         }
         return pdpResponseDetails;
     }
-
-    /**
-     * Method to handle when the new state from pap is terminated.
-     *
-     * @param pdpStateChangeMsg
-     * @param pdpStatusPublisher
-     * @param pdpMessageHandler
-     * @return pdpResponseDetails
-     */
-    private PdpResponseDetails handleTerminatedState(final PdpStateChange pdpStateChangeMsg,
-            final PdpStatus pdpStatusContext, final PdpMessageHandler pdpMessageHandler) {
-
-        PdpResponseDetails pdpResponseDetails;
-        if (pdpStatusContext.getState().equals(PdpState.ACTIVE)) {
-            final ApexEngineHandler apexEngineHandler = Registry.get(ApexStarterConstants.REG_APEX_ENGINE_HANDLER);
-            try {
-                apexEngineHandler.shutdown();
-                pdpStatusContext.setState(PdpState.PASSIVE);
-                pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
-                        PdpResponseStatus.SUCCESS, "Apex Engine stopped. State changed to passive.");
-            } catch (final Exception e) {
-                pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
-                        PdpResponseStatus.FAIL,
-                        "Stopping apex engine failed. State cannot be changed." + e.getMessage());
-            }
-        } else {
-            pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
-                    PdpResponseStatus.SUCCESS, "Pdp already in passive state");
-        }
-        return pdpResponseDetails;
-
-    }
 }
diff --git a/services/services-onappf/src/main/java/org/onap/policy/apex/starter/handler/PdpUpdateMessageHandler.java b/services/services-onappf/src/main/java/org/onap/policy/apex/starter/handler/PdpUpdateMessageHandler.java
index 835c2993a..5198c229e 100644
--- a/services/services-onappf/src/main/java/org/onap/policy/apex/starter/handler/PdpUpdateMessageHandler.java
+++ b/services/services-onappf/src/main/java/org/onap/policy/apex/starter/handler/PdpUpdateMessageHandler.java
@@ -32,6 +32,7 @@ import org.onap.policy.models.pdp.concepts.PdpResponseDetails;
 import org.onap.policy.models.pdp.concepts.PdpStatus;
 import org.onap.policy.models.pdp.concepts.PdpUpdate;
 import org.onap.policy.models.pdp.enums.PdpResponseStatus;
+import org.onap.policy.models.pdp.enums.PdpState;
 
 /**
  * This class supports the handling of pdp update messages.
@@ -40,7 +41,6 @@ import org.onap.policy.models.pdp.enums.PdpResponseStatus;
  */
 public class PdpUpdateMessageHandler {
 
-
     /**
      * Method which handles a pdp update event from PAP.
      *
@@ -49,8 +49,9 @@ public class PdpUpdateMessageHandler {
     public void handlePdpUpdateEvent(final PdpUpdate pdpUpdateMsg) {
         final PdpMessageHandler pdpMessageHandler = new PdpMessageHandler();
         final PdpStatus pdpStatusContext = Registry.get(ApexStarterConstants.REG_PDP_STATUS_OBJECT, PdpStatus.class);
-        PdpResponseDetails pdpResponseDetails;
-        if (pdpStatusContext.getName().equals(pdpUpdateMsg.getName())) {
+        PdpResponseDetails pdpResponseDetails = null;
+        if (pdpUpdateMsg.appliesTo(pdpStatusContext.getName(), pdpStatusContext.getPdpGroup(),
+                pdpStatusContext.getPdpSubgroup())) {
             final PdpStatusPublisher pdpStatusPublisher = Registry.get(ApexStarterConstants.REG_PDP_STATUS_PUBLISHER);
             if (checkIfAlreadyHandled(pdpUpdateMsg, pdpStatusContext, pdpStatusPublisher.getInterval())) {
                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
@@ -64,32 +65,68 @@ public class PdpUpdateMessageHandler {
                 pdpStatusContext.setPdpSubgroup(pdpUpdateMsg.getPdpSubgroup());
                 pdpStatusContext
                         .setPolicies(new PdpMessageHandler().getToscaPolicyIdentifiers(pdpUpdateMsg.getPolicies()));
-                if (pdpUpdateMsg.getPolicies().isEmpty()) {
-                    final ApexEngineHandler apexEngineHandler =
-                            Registry.get(ApexStarterConstants.REG_APEX_ENGINE_HANDLER);
-                    if (apexEngineHandler.isApexEngineRunning()) {
-                        try {
-                            apexEngineHandler.shutdown();
-                        } catch (final ApexStarterException e) {
-                            pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
-                                    PdpResponseStatus.FAIL,
-                                    "Pdp update failed as the policies couldn't be undeployed.");
-                        }
-                    }
+                if (pdpStatusContext.getState().equals(PdpState.ACTIVE)) {
+                    pdpResponseDetails =
+                            startOrStopApexEngineBasedOnPolicies(pdpUpdateMsg, pdpMessageHandler, pdpStatusContext);
                 }
                 Registry.registerOrReplace(ApexStarterConstants.REG_APEX_TOSCA_POLICY_LIST, pdpUpdateMsg.getPolicies());
-                pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
-                        PdpResponseStatus.SUCCESS, "Pdp update successful.");
+                if (null == pdpResponseDetails) {
+                    pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
+                            PdpResponseStatus.SUCCESS, "Pdp update successful.");
+                }
             }
             final PdpStatusPublisher pdpStatusPublisherTemp =
                     Registry.get(ApexStarterConstants.REG_PDP_STATUS_PUBLISHER);
             final PdpStatus pdpStatus = pdpMessageHandler.createPdpStatusFromContext();
             pdpStatus.setResponse(pdpResponseDetails);
+            pdpStatus.setDescription("Pdp status response message for PdpUpdate");
             pdpStatusPublisherTemp.send(pdpStatus);
         }
     }
 
     /**
+     * Method to start or stop apex engine based on the list of policies received from pap. When current state is
+     * active, if PAP sends PdpUpdate with empty policies list, stop apex engine, or, if there is a change in policies,
+     * stop the current running policies and the deploy the new ones.
+     *
+     * @param pdpUpdateMsg
+     * @param pdpMessageHandler
+     * @param pdpStatusContext
+     * @return pdpResponseDetails
+     */
+    private PdpResponseDetails startOrStopApexEngineBasedOnPolicies(final PdpUpdate pdpUpdateMsg,
+            final PdpMessageHandler pdpMessageHandler, final PdpStatus pdpStatusContext) {
+        PdpResponseDetails pdpResponseDetails = null;
+        if (pdpUpdateMsg.getPolicies().isEmpty()) {
+            final ApexEngineHandler apexEngineHandler = Registry.get(ApexStarterConstants.REG_APEX_ENGINE_HANDLER);
+            if (apexEngineHandler.isApexEngineRunning()) {
+                try {
+                    apexEngineHandler.shutdown();
+                } catch (final ApexStarterException e) {
+                    pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
+                            PdpResponseStatus.FAIL, "Pdp update failed as the policies couldn't be undeployed.");
+                }
+            }
+        } else {
+            try {
+                ApexEngineHandler apexEngineHandler = Registry.get(ApexStarterConstants.REG_APEX_ENGINE_HANDLER);
+                if (apexEngineHandler.isApexEngineRunning()) {
+                    apexEngineHandler.shutdown();
+                }
+                apexEngineHandler = new ApexEngineHandler(
+                        (String) pdpUpdateMsg.getPolicies().get(0).getProperties().get("content"));
+                Registry.registerOrReplace(ApexStarterConstants.REG_APEX_ENGINE_HANDLER, apexEngineHandler);
+                pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
+                        PdpResponseStatus.SUCCESS, "Apex engine started and policies are running.");
+            } catch (final ApexStarterException e) {
+                pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
+                        PdpResponseStatus.FAIL, "Apex engine service running failed. " + e.getMessage());
+            }
+        }
+        return pdpResponseDetails;
+    }
+
+    /**
      * Method checks of the Pdp update message is already handled by checking the values in the context.
      *
      * @param pdpUpdateMsg pdp update message received from pap
@@ -104,10 +141,12 @@ public class PdpUpdateMessageHandler {
                 && null != pdpStatusContext.getPdpSubgroup()
                 && pdpStatusContext.getPdpSubgroup().equals(pdpUpdateMsg.getPdpSubgroup())
                 && null != pdpStatusContext.getPolicies()
-                && pdpStatusContext.getPolicies()
-                        .containsAll(new PdpMessageHandler().getToscaPolicyIdentifiers(pdpUpdateMsg.getPolicies()))
-                && null != pdpUpdateMsg.getPdpHeartbeatIntervalMs() && pdpUpdateMsg.getPdpHeartbeatIntervalMs() > 0
-                && interval == pdpUpdateMsg.getPdpHeartbeatIntervalMs();
+                && new PdpMessageHandler().getToscaPolicyIdentifiers(pdpUpdateMsg.getPolicies())
+                        .equals(pdpStatusContext.getPolicies())
+                && (null == pdpUpdateMsg.getPdpHeartbeatIntervalMs()
+                        || (null != pdpUpdateMsg.getPdpHeartbeatIntervalMs()
+                                && pdpUpdateMsg.getPdpHeartbeatIntervalMs() > 0
+                                && interval == pdpUpdateMsg.getPdpHeartbeatIntervalMs()));
     }
 
     /**