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 import org.onap.policy.apex.services.onappf.ApexStarterConstants;
  25 import org.onap.policy.apex.services.onappf.comm.PdpStatusPublisher;
  26 import org.onap.policy.apex.services.onappf.exception.ApexStarterException;
  27 import org.onap.policy.common.utils.services.Registry;
  28 import org.onap.policy.models.pdp.concepts.PdpResponseDetails;
  29 import org.onap.policy.models.pdp.concepts.PdpStateChange;
  30 import org.onap.policy.models.pdp.concepts.PdpStatus;
  31 import org.onap.policy.models.pdp.enums.PdpResponseStatus;
  32 import org.onap.policy.models.pdp.enums.PdpState;
  33 import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
  34 import org.slf4j.Logger;
  35 import org.slf4j.LoggerFactory;
  36
  37 /**
  38  * This class supports the handling of pdp state change messages.
  39  *
  40  * @author Ajith Sreekumar (ajith.sreekumar@est.tech)
  41  */
  42 public class PdpStateChangeMessageHandler {
  43
  44     private static final Logger LOGGER = LoggerFactory.getLogger(PdpStateChangeMessageHandler.class);
  45
  46     /**
  47      * Method which handles a pdp state change event from PAP.
  48      *
  49      * @param pdpStateChangeMsg pdp state change message
  50      */
  51     public void handlePdpStateChangeEvent(final PdpStateChange pdpStateChangeMsg) {
  52         final PdpStatus pdpStatusContext = Registry.get(ApexStarterConstants.REG_PDP_STATUS_OBJECT, PdpStatus.class);
  53         final PdpStatusPublisher pdpStatusPublisher = Registry.get(ApexStarterConstants.REG_PDP_STATUS_PUBLISHER);
  54         final PdpMessageHandler pdpMessageHandler = new PdpMessageHandler();
  55         PdpResponseDetails pdpResponseDetails = null;
  56         if (pdpStateChangeMsg.appliesTo(pdpStatusContext.getName(), pdpStatusContext.getPdpGroup(),
  57                 pdpStatusContext.getPdpSubgroup())) {
  58             switch (pdpStateChangeMsg.getState()) {
  59                 case PASSIVE:
  60                     pdpResponseDetails = handlePassiveState(pdpStateChangeMsg, pdpStatusContext, pdpMessageHandler);
  61                     break;
  62                 case ACTIVE:
  63                     pdpResponseDetails = handleActiveState(pdpStateChangeMsg, pdpStatusContext, pdpMessageHandler);
  64                     break;
  65                 default:
  66                     break;
  67             }
  68             final PdpStatus pdpStatus = pdpMessageHandler.createPdpStatusFromContext();
  69             pdpStatus.setResponse(pdpResponseDetails);
  70             pdpStatus.setDescription("Pdp status response message for PdpStateChange");
  71             pdpStatusPublisher.send(pdpStatus);
  72         }
  73     }
  74
  75     /**
  76      * Method to handle when the new state from pap is active.
  77      *
  78      * @param pdpStateChangeMsg pdp state change message
  79      * @param pdpStatusContext pdp status object in memory
  80      * @param pdpMessageHandler the pdp message handler
  81      * @return pdpResponseDetails pdp response
  82      */
  83     private PdpResponseDetails handleActiveState(final PdpStateChange pdpStateChangeMsg,
  84             final PdpStatus pdpStatusContext, final PdpMessageHandler pdpMessageHandler) {
  85         PdpResponseDetails pdpResponseDetails = null;
  86         if (pdpStatusContext.getState().equals(PdpState.ACTIVE)) {
  87             pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
  88                     PdpResponseStatus.SUCCESS, "Pdp already in active state");
  89         } else {
  90             final List<ToscaPolicy> policies = Registry.get(ApexStarterConstants.REG_APEX_TOSCA_POLICY_LIST);
  91             if (policies.isEmpty()) {
  92                 pdpStatusContext.setState(PdpState.ACTIVE);
  93                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
  94                         PdpResponseStatus.SUCCESS, "State changed to active. No policies found.");
  95             } else {
  96                 try {
  97                     // assumed that the apex policies list contains only one entry.
  98                     final ApexEngineHandler apexEngineHandler =
  99                             new ApexEngineHandler(policies.get(0).getProperties().get("content"));
 100                     Registry.registerOrReplace(ApexStarterConstants.REG_APEX_ENGINE_HANDLER, apexEngineHandler);
 101                     if (apexEngineHandler.isApexEngineRunning()) {
 102                         pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 103                             PdpResponseStatus.SUCCESS, "Apex engine started. State changed to active.");
 104                         pdpStatusContext.setState(PdpState.ACTIVE);
 105                     } else {
 106                         pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 107                             PdpResponseStatus.FAIL, "Apex engine failed to start. State cannot be changed to active.");
 108                     }
 109                 } catch (final ApexStarterException e) {
 110                     LOGGER.error("Pdp update failed as the policies couldn't be undeployed.", e);
 111                     pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 112                             PdpResponseStatus.FAIL, "Apex engine service running failed. " + e.getMessage());
 113                 }
 114             }
 115         }
 116         return pdpResponseDetails;
 117     }
 118
 119     /**
 120      * Method to handle when the new state from pap is passive.
 121      *
 122      * @param pdpStateChangeMsg pdp state change message
 123      * @param pdpStatusContext pdp status object in memory
 124      * @param pdpMessageHandler the pdp message handler
 125      * @return pdpResponseDetails pdp response
 126      */
 127     private PdpResponseDetails handlePassiveState(final PdpStateChange pdpStateChangeMsg,
 128             final PdpStatus pdpStatusContext, final PdpMessageHandler pdpMessageHandler) {
 129         PdpResponseDetails pdpResponseDetails = null;
 130         if (pdpStatusContext.getState().equals(PdpState.PASSIVE)) {
 131             pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 132                     PdpResponseStatus.SUCCESS, "Pdp already in passive state");
 133         } else {
 134             ApexEngineHandler apexEngineHandler = null;
 135             try {
 136                 apexEngineHandler = Registry.get(ApexStarterConstants.REG_APEX_ENGINE_HANDLER);
 137             } catch (final IllegalArgumentException e) {
 138                 LOGGER.debug("ApenEngineHandler not in registry.", e);
 139             }
 140             try {
 141                 if (null != apexEngineHandler && apexEngineHandler.isApexEngineRunning()) {
 142                     apexEngineHandler.shutdown();
 143                 }
 144                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 145                         PdpResponseStatus.SUCCESS, "Apex pdp state changed from Active to Passive.");
 146                 pdpStatusContext.setState(PdpState.PASSIVE);
 147             } catch (final Exception e) {
 148                 LOGGER.error("Stopping apex engine failed. State cannot be changed to Passive.", e);
 149                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 150                         PdpResponseStatus.FAIL,
 151                         "Stopping apex engine failed. State cannot be changed to Passive." + e.getMessage());
 152             }
 153         }
 154         return pdpResponseDetails;
 155     }
 156 }