coe/impl/src/main/java/org/opendaylight/netvirt/coe/listeners/ServiceListener.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.coe.listeners;
  10
  11 import java.util.Collection;
  12 import javax.annotation.Nonnull;
  13 import javax.annotation.PreDestroy;
  14 import javax.inject.Inject;
  15 import javax.inject.Singleton;
  16 import org.apache.aries.blueprint.annotation.service.Reference;
  17 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  18 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
  19 import org.opendaylight.controller.md.sal.binding.api.DataTreeChangeListener;
  20 import org.opendaylight.controller.md.sal.binding.api.DataTreeIdentifier;
  21 import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
  22 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.coe.northbound.service.rev170611.ServiceInformation;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.coe.northbound.service.rev170611.service.information.Services;
  25 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  26 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29
  30 @Singleton
  31 public class ServiceListener implements DataTreeChangeListener<Services> {
  32
  33     private static final Logger LOG = LoggerFactory.getLogger(ServiceListener.class);
  34     private ListenerRegistration<ServiceListener> listenerRegistration;
  35
  36     @Inject
  37     public ServiceListener(@Reference final DataBroker dataBroker) {
  38         registerListener(LogicalDatastoreType.CONFIGURATION, dataBroker);
  39     }
  40
  41     protected InstanceIdentifier<Services> getWildCardPath() {
  42         return InstanceIdentifier.create(ServiceInformation.class).child(Services.class);
  43     }
  44
  45     public void registerListener(LogicalDatastoreType dsType, final DataBroker db) {
  46         final DataTreeIdentifier<Services> treeId = new DataTreeIdentifier<>(dsType, getWildCardPath());
  47         listenerRegistration = db.registerDataTreeChangeListener(treeId, ServiceListener.this);
  48     }
  49
  50     @PreDestroy
  51     public void close() {
  52         if (listenerRegistration != null) {
  53             try {
  54                 listenerRegistration.close();
  55             } finally {
  56                 listenerRegistration = null;
  57             }
  58         }
  59     }
  60
  61     @Override
  62     public void onDataTreeChanged(@Nonnull Collection<DataTreeModification<Services>> changes) {
  63         for (DataTreeModification<Services> change : changes) {
  64             final DataObjectModification<Services> mod = change.getRootNode();
  65
  66             switch (mod.getModificationType()) {
  67                 case DELETE:
  68                     LOG.info("Service deleted {}", mod.getDataBefore());
  69                     break;
  70                 case SUBTREE_MODIFIED:
  71                     LOG.info("Service updated old : {}, new : {}", mod.getDataBefore(), mod.getDataAfter());
  72                     break;
  73                 case WRITE:
  74                     if (mod.getDataBefore() == null) {
  75                         LOG.info("Service added {}", mod.getDataAfter());
  76                     } else {
  77                         LOG.info("Service updated old : {}, new : {}", mod.getDataBefore(), mod.getDataAfter());
  78                     }
  79                     break;
  80                 default:
  81                     // FIXME: May be not a good idea to throw.
  82                     throw new IllegalArgumentException("Unhandled modification type " + mod.getModificationType());
  83             }
  84         }
  85     }
  86 }