vpnservice/qosservice/impl/src/main/java/org/opendaylight/netvirt/qosservice/QosAlertEosHandler.java

   1 /*
   2  * Copyright (c) 2017 Ericsson India Global Services Pvt Ltd. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.netvirt.qosservice;
  10
  11 import javax.annotation.PostConstruct;
  12 import javax.annotation.PreDestroy;
  13 import javax.inject.Inject;
  14 import javax.inject.Singleton;
  15 import org.opendaylight.controller.md.sal.common.api.clustering.CandidateAlreadyRegisteredException;
  16 import org.opendaylight.controller.md.sal.common.api.clustering.Entity;
  17 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipCandidateRegistration;
  18 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipChange;
  19 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipListener;
  20 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipListenerRegistration;
  21 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipService;
  22 import org.slf4j.Logger;
  23 import org.slf4j.LoggerFactory;
  24
  25 @Singleton
  26 public class QosAlertEosHandler implements EntityOwnershipListener, AutoCloseable {
  27
  28     private static EntityOwnershipService entityOwnershipService;
  29     private static QosAlertManager qosAlertManager;
  30     private static EntityOwnershipListenerRegistration listenerRegistration;
  31     private static EntityOwnershipCandidateRegistration candidateRegistration;
  32     private static final Logger LOG = LoggerFactory.getLogger(QosAlertEosHandler.class);
  33
  34     @Inject
  35     public QosAlertEosHandler(final EntityOwnershipService eos, final QosAlertManager qam) {
  36         entityOwnershipService = eos;
  37         qosAlertManager = qam;
  38     }
  39
  40     @PostConstruct
  41     public void init() {
  42         registerQosAlertEosListener();
  43     }
  44
  45     @Override
  46     @PreDestroy
  47     public void close() {
  48         listenerRegistration.close();
  49         candidateRegistration.close();
  50         LOG.trace("entity ownership unregisterated");
  51     }
  52
  53     private void registerQosAlertEosListener() {
  54         listenerRegistration =
  55                 entityOwnershipService.registerListener(QosConstants.QOS_ALERT_OWNER_ENTITY_TYPE, this);
  56         Entity instanceEntity = new Entity(
  57                 QosConstants.QOS_ALERT_OWNER_ENTITY_TYPE, QosConstants.QOS_ALERT_OWNER_ENTITY_TYPE);
  58         try {
  59             candidateRegistration = entityOwnershipService.registerCandidate(instanceEntity);
  60         } catch (CandidateAlreadyRegisteredException e) {
  61             LOG.warn("qosalet instance entity {} was already "
  62                     + "registered for ownership", instanceEntity, e);
  63         }
  64         LOG.trace("entity ownership registeration successful");
  65     }
  66
  67     @Override
  68     public void ownershipChanged(EntityOwnershipChange entityOwnershipChange) {
  69         LOG.trace("ownershipChanged: {}", entityOwnershipChange);
  70
  71         if ((entityOwnershipChange.hasOwner() && entityOwnershipChange.isOwner())
  72                 || (!entityOwnershipChange.hasOwner() && entityOwnershipChange.wasOwner())) {
  73             qosAlertManager.setQosAlertOwner(true); // continue polling until new owner is elected
  74         } else {
  75             qosAlertManager.setQosAlertOwner(false); // no longer an owner
  76         }
  77     }
  78 }