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                 pdpStatusContext.setState(PdpState.ACTIVE);
  94                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
  95                         PdpResponseStatus.SUCCESS, "State changed to active. No policies found.");
  96             } else {
  97                 try {
  98                     // assumed that the apex policies list contains only one entry.
  99                     final ApexEngineHandler apexEngineHandler =
 100                             new ApexEngineHandler((String) policies.get(0).getProperties().get("content"));
 101                     Registry.registerOrReplace(ApexStarterConstants.REG_APEX_ENGINE_HANDLER, apexEngineHandler);
 102                     pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 103                             PdpResponseStatus.SUCCESS, "Apex engine started. State changed to active.");
 104                     pdpStatusContext.setState(PdpState.ACTIVE);
 105                 } catch (final ApexStarterException e) {
 106                     LOGGER.error("Pdp update failed as the policies couldn't be undeployed.", e);
 107                     pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 108                             PdpResponseStatus.FAIL, "Apex engine service running failed. " + e.getMessage());
 109                 }
 110             }
 111         }
 112         return pdpResponseDetails;
 113     }
 114
 115     /**
 116      * Method to handle when the new state from pap is passive.
 117      *
 118      * @param pdpStateChangeMsg pdp state change message
 119      * @param pdpStatusContext pdp status object in memory
 120      * @param pdpMessageHandler the pdp message handler
 121      * @return pdpResponseDetails pdp response
 122      */
 123     private PdpResponseDetails handlePassiveState(final PdpStateChange pdpStateChangeMsg,
 124             final PdpStatus pdpStatusContext, final PdpMessageHandler pdpMessageHandler) {
 125         PdpResponseDetails pdpResponseDetails = null;
 126         if (pdpStatusContext.getState().equals(PdpState.PASSIVE)) {
 127             pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 128                     PdpResponseStatus.SUCCESS, "Pdp already in passive state");
 129         } else {
 130             ApexEngineHandler apexEngineHandler = null;
 131             try {
 132                 apexEngineHandler = Registry.get(ApexStarterConstants.REG_APEX_ENGINE_HANDLER);
 133             } catch (final IllegalArgumentException e) {
 134                 LOGGER.debug("ApenEngineHandler not in registry.", e);
 135             }
 136             try {
 137                 if (null != apexEngineHandler && apexEngineHandler.isApexEngineRunning()) {
 138                     apexEngineHandler.shutdown();
 139                 }
 140                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 141                         PdpResponseStatus.SUCCESS, "Apex pdp state changed from Active to Passive.");
 142                 pdpStatusContext.setState(PdpState.PASSIVE);
 143             } catch (final Exception e) {
 144                 LOGGER.error("Stopping apex engine failed. State cannot be changed to Passive.", e);
 145                 pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
 146                         PdpResponseStatus.FAIL,
 147                         "Stopping apex engine failed. State cannot be changed to Passive." + e.getMessage());
 148             }
 149         }
 150         return pdpResponseDetails;
 151     }
 152 }