gerrit.onap Code Review - policy/apex-pdp.git/blob

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  *  Copyright (C) 2019 Nordix Foundation.
   4  * ================================================================================
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *      http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  *
  17  * SPDX-License-Identifier: Apache-2.0
  18  * ============LICENSE_END=========================================================
  19  */
  20
  21 package org.onap.policy.apex.services.onappf.handler;
  22
  23 import java.util.List;
  24
  25 import org.onap.policy.apex.services.onappf.ApexStarterConstants;
  26 import org.onap.policy.apex.services.onappf.comm.PdpStatusPublisher;
  27 import org.onap.policy.apex.services.onappf.exception.ApexStarterException;
  28 import org.onap.policy.common.utils.services.Registry;
  29 import org.onap.policy.models.pdp.concepts.PdpResponseDetails;
  30 import org.onap.policy.models.pdp.concepts.PdpStateChange;
  31 import org.onap.policy.models.pdp.concepts.PdpStatus;
  32 import org.onap.policy.models.pdp.enums.PdpResponseStatus;
  33 import org.onap.policy.models.pdp.enums.PdpState;
  34 import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
  35
  36 /**
  37  * This class supports the handling of pdp state change messages.
  38  *
  39  * @author Ajith Sreekumar (ajith.sreekumar@est.tech)
  40  */
  41 public class PdpStateChangeMessageHandler {
  42
  43     /**
  44      * Method which handles a pdp state change event from PAP.
  45      *
  46      * @param pdpStateChangeMsg pdp state change message
  47      */
  48     public void handlePdpStateChangeEvent(final PdpStateChange pdpStateChangeMsg) {
  49         final PdpStatus pdpStatusContext = Registry.get(ApexStarterConstants.REG_PDP_STATUS_OBJECT, PdpStatus.class);
  50         final PdpStatusPublisher pdpStatusPublisher = Registry.get(ApexStarterConstants.REG_PDP_STATUS_PUBLISHER);
  51         final PdpMessageHandler pdpMessageHandler = new PdpMessageHandler();
  52         PdpResponseDetails pdpResponseDetails = null;
  53         if (pdpStateChangeMsg.appliesTo(pdpStatusContext.getName(), pdpStatusContext.getPdpGroup(),
  54                 pdpStatusContext.getPdpSubgroup())) {
  55             switch (pdpStateChangeMsg.getState()) {
  56                 case PASSIVE:
  57                     pdpResponseDetails = handlePassiveState(pdpStateChangeMsg, pdpStatusContext, pdpMessageHandler);
  58                     break;
  59                 case ACTIVE:
  60                     pdpResponseDetails = handleActiveState(pdpStateChangeMsg, pdpStatusContext, pdpMessageHandler);
  61                     break;
  62                 default:
  63                     break;
  64             }
  65             final PdpStatus pdpStatus = pdpMessageHandler.createPdpStatusFromContext();
  66             pdpStatus.setResponse(pdpResponseDetails);
  67             pdpStatus.setDescription("Pdp status response message for PdpStateChange");
  68             pdpStatusPublisher.send(pdpStatus);
  69         }
  70     }
  71
  72     /**
  73      * Method to handle when the new state from pap is active.
  74      *
  75      * @param pdpStateChangeMsg
  76      * @param pdpStatusContext
  77      * @param pdpMessageHandler
  78      * @return pdpResponseDetails
  79      */
  80     private PdpResponseDetails handleActiveState(final PdpStateChange pdpStateChangeMsg,
  81             final PdpStatus pdpStatusContext, final PdpMessageHandler pdpMessageHandler) {
  82         PdpResponseDetails pdpResponseDetails = null;
  83         if (pdpStatusContext.getState().equals(PdpState.ACTIVE)) {
  84             pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
  85                     PdpResponseStatus.SUCCESS, "Pdp already in active state");
  86         } else {
  87             final List<ToscaPolicy> policies = Registry.get(ApexStarterConstants.REG_APEX_TOSCA_POLICY_LIST);
  88             if (policies.isEmpty()) {
  89                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
  90                         PdpResponseStatus.SUCCESS, "No policies found. Apex engine not running.");
  91             } else {
  92                 try {
  93                     // assumed that the apex policies list contains only one entry.
  94                     final ApexEngineHandler apexEngineHandler =
  95                             new ApexEngineHandler((String) policies.get(0).getProperties().get("content"));
  96                     Registry.registerOrReplace(ApexStarterConstants.REG_APEX_ENGINE_HANDLER, apexEngineHandler);
  97                     pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
  98                             PdpResponseStatus.SUCCESS, "Apex engine started. State changed to active.");
  99                     pdpStatusContext.setState(PdpState.ACTIVE);
 100                 } catch (final ApexStarterException e) {
 101                     pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 102                             PdpResponseStatus.FAIL, "Apex engine service running failed. " + e.getMessage());
 103                 }
 104             }
 105         }
 106         return pdpResponseDetails;
 107     }
 108
 109     /**
 110      * Method to handle when the new state from pap is passive.
 111      *
 112      * @param pdpStateChangeMsg
 113      * @param pdpStatusContext
 114      * @param pdpMessageHandler
 115      * @return pdpResponseDetails
 116      */
 117     private PdpResponseDetails handlePassiveState(final PdpStateChange pdpStateChangeMsg,
 118             final PdpStatus pdpStatusContext, final PdpMessageHandler pdpMessageHandler) {
 119         PdpResponseDetails pdpResponseDetails = null;
 120         if (pdpStatusContext.getState().equals(PdpState.PASSIVE)) {
 121             pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 122                     PdpResponseStatus.SUCCESS, "Pdp already in passive state");
 123         } else {
 124             final ApexEngineHandler apexEngineHandler = Registry.get(ApexStarterConstants.REG_APEX_ENGINE_HANDLER);
 125             try {
 126                 apexEngineHandler.shutdown();
 127                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 128                         PdpResponseStatus.SUCCESS, "Apex pdp state changed from Active to Passive.");
 129                 pdpStatusContext.setState(PdpState.PASSIVE);
 130             } catch (final Exception e) {
 131                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 132                         PdpResponseStatus.FAIL,
 133                         "Stopping apex engine failed. State cannot be changed to Passive." + e.getMessage());
 134             }
 135         }
 136         return pdpResponseDetails;
 137     }
 138 }