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 import org.slf4j.Logger;
  36 import org.slf4j.LoggerFactory;
  37
  38 /**
  39  * This class supports the handling of pdp state change messages.
  40  *
  41  * @author Ajith Sreekumar (ajith.sreekumar@est.tech)
  42  */
  43 public class PdpStateChangeMessageHandler {
  44
  45     private static final Logger LOGGER = LoggerFactory.getLogger(PdpStateChangeMessageHandler.class);
  46
  47     /**
  48      * Method which handles a pdp state change event from PAP.
  49      *
  50      * @param pdpStateChangeMsg pdp state change message
  51      */
  52     public void handlePdpStateChangeEvent(final PdpStateChange pdpStateChangeMsg) {
  53         final PdpStatus pdpStatusContext = Registry.get(ApexStarterConstants.REG_PDP_STATUS_OBJECT, PdpStatus.class);
  54         final PdpStatusPublisher pdpStatusPublisher = Registry.get(ApexStarterConstants.REG_PDP_STATUS_PUBLISHER);
  55         final PdpMessageHandler pdpMessageHandler = new PdpMessageHandler();
  56         PdpResponseDetails pdpResponseDetails = null;
  57         if (pdpStateChangeMsg.appliesTo(pdpStatusContext.getName(), pdpStatusContext.getPdpGroup(),
  58                 pdpStatusContext.getPdpSubgroup())) {
  59             switch (pdpStateChangeMsg.getState()) {
  60                 case PASSIVE:
  61                     pdpResponseDetails = handlePassiveState(pdpStateChangeMsg, pdpStatusContext, pdpMessageHandler);
  62                     break;
  63                 case ACTIVE:
  64                     pdpResponseDetails = handleActiveState(pdpStateChangeMsg, pdpStatusContext, pdpMessageHandler);
  65                     break;
  66                 default:
  67                     break;
  68             }
  69             final PdpStatus pdpStatus = pdpMessageHandler.createPdpStatusFromContext();
  70             pdpStatus.setResponse(pdpResponseDetails);
  71             pdpStatus.setDescription("Pdp status response message for PdpStateChange");
  72             pdpStatusPublisher.send(pdpStatus);
  73         }
  74     }
  75
  76     /**
  77      * Method to handle when the new state from pap is active.
  78      *
  79      * @param pdpStateChangeMsg pdp state change message
  80      * @param pdpStatusContext pdp status object in memory
  81      * @param pdpMessageHandler the pdp message handler
  82      * @return pdpResponseDetails pdp response
  83      */
  84     private PdpResponseDetails handleActiveState(final PdpStateChange pdpStateChangeMsg,
  85             final PdpStatus pdpStatusContext, final PdpMessageHandler pdpMessageHandler) {
  86         PdpResponseDetails pdpResponseDetails = null;
  87         if (pdpStatusContext.getState().equals(PdpState.ACTIVE)) {
  88             pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
  89                     PdpResponseStatus.SUCCESS, "Pdp already in active state");
  90         } else {
  91             final List<ToscaPolicy> policies = Registry.get(ApexStarterConstants.REG_APEX_TOSCA_POLICY_LIST);
  92             if (policies.isEmpty()) {
  93                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
  94                         PdpResponseStatus.SUCCESS, "No policies found. Apex engine not running.");
  95             } else {
  96                 try {
  97                     // assumed that the apex policies list contains only one entry.
  98                     final ApexEngineHandler apexEngineHandler =
  99                             new ApexEngineHandler((String) policies.get(0).getProperties().get("content"));
 100                     Registry.registerOrReplace(ApexStarterConstants.REG_APEX_ENGINE_HANDLER, apexEngineHandler);
 101                     pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 102                             PdpResponseStatus.SUCCESS, "Apex engine started. State changed to active.");
 103                     pdpStatusContext.setState(PdpState.ACTIVE);
 104                 } catch (final ApexStarterException e) {
 105                     LOGGER.error("Pdp update failed as the policies couldn't be undeployed.", e);
 106                     pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 107                             PdpResponseStatus.FAIL, "Apex engine service running failed. " + e.getMessage());
 108                 }
 109             }
 110         }
 111         return pdpResponseDetails;
 112     }
 113
 114     /**
 115      * Method to handle when the new state from pap is passive.
 116      *
 117      * @param pdpStateChangeMsg pdp state change message
 118      * @param pdpStatusContext pdp status object in memory
 119      * @param pdpMessageHandler the pdp message handler
 120      * @return pdpResponseDetails pdp response
 121      */
 122     private PdpResponseDetails handlePassiveState(final PdpStateChange pdpStateChangeMsg,
 123             final PdpStatus pdpStatusContext, final PdpMessageHandler pdpMessageHandler) {
 124         PdpResponseDetails pdpResponseDetails = null;
 125         if (pdpStatusContext.getState().equals(PdpState.PASSIVE)) {
 126             pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 127                     PdpResponseStatus.SUCCESS, "Pdp already in passive state");
 128         } else {
 129             final ApexEngineHandler apexEngineHandler = Registry.get(ApexStarterConstants.REG_APEX_ENGINE_HANDLER);
 130             try {
 131                 apexEngineHandler.shutdown();
 132                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 133                         PdpResponseStatus.SUCCESS, "Apex pdp state changed from Active to Passive.");
 134                 pdpStatusContext.setState(PdpState.PASSIVE);
 135             } catch (final Exception e) {
 136                 LOGGER.error("Stopping apex engine failed. State cannot be changed to Passive.", e);
 137                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 138                         PdpResponseStatus.FAIL,
 139                         "Stopping apex engine failed. State cannot be changed to Passive." + e.getMessage());
 140             }
 141         }
 142         return pdpResponseDetails;
 143     }
 144 }