interfacemanager/interfacemanager-impl/src/main/java/org/opendaylight/genius/interfacemanager/listeners/CacheBridgeRefEntryListener.java

   1 /*
   2  * Copyright (c) 2016, 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.genius.interfacemanager.listeners;
  10
  11 import java.util.Collection;
  12 import javax.annotation.PreDestroy;
  13 import javax.inject.Inject;
  14 import javax.inject.Singleton;
  15
  16 import org.apache.aries.blueprint.annotation.service.Reference;
  17 import org.opendaylight.genius.interfacemanager.commons.InterfaceMetaUtils;
  18 import org.opendaylight.mdsal.binding.api.ClusteredDataTreeChangeListener;
  19 import org.opendaylight.mdsal.binding.api.DataBroker;
  20 import org.opendaylight.mdsal.binding.api.DataObjectModification;
  21 import org.opendaylight.mdsal.binding.api.DataTreeIdentifier;
  22 import org.opendaylight.mdsal.binding.api.DataTreeModification;
  23 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.meta.rev160406.BridgeRefInfo;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.meta.rev160406.bridge.ref.info.BridgeRefEntry;
  26 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  27 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 /**
  32  * This class listens for bridgeRefEntry creation/removal/update in Operational
  33  * DS and update the bridgeRefEntryCache as per changes in DS.
  34  *
  35  */
  36 @Singleton
  37 public class CacheBridgeRefEntryListener implements ClusteredDataTreeChangeListener<BridgeRefEntry> {
  38     private static final Logger LOG = LoggerFactory.getLogger(CacheBridgeRefEntryListener.class);
  39
  40     private final InterfaceMetaUtils interfaceMetaUtils;
  41     private final ListenerRegistration<CacheBridgeRefEntryListener> registration;
  42     private final DataTreeIdentifier<BridgeRefEntry> treeId =
  43             DataTreeIdentifier.create(LogicalDatastoreType.OPERATIONAL,
  44             InstanceIdentifier.create(BridgeRefInfo.class).child(BridgeRefEntry.class));
  45
  46     @Inject
  47     public CacheBridgeRefEntryListener(@Reference DataBroker dataBroker, InterfaceMetaUtils interfaceMetaUtils) {
  48         LOG.trace("Registering on path: {}", treeId);
  49         this.interfaceMetaUtils = interfaceMetaUtils;
  50         registration = dataBroker.registerDataTreeChangeListener(treeId, CacheBridgeRefEntryListener.this);
  51     }
  52
  53     @PreDestroy
  54     public void close() {
  55         if (registration != null) {
  56             registration.close();
  57         }
  58     }
  59
  60     @Override
  61     public void onDataTreeChanged(Collection<DataTreeModification<BridgeRefEntry>> changes) {
  62         for (DataTreeModification<BridgeRefEntry> change : changes) {
  63             final DataObjectModification<BridgeRefEntry> mod = change.getRootNode();
  64             switch (mod.getModificationType()) {
  65                 case DELETE:
  66                     /*
  67                      * Note: Do we want to retain entry in cache? Ref Entry missing
  68                      * means OVS being disconnected for now. It will either come
  69                      * back, or will require config to be deleted.
  70                      *
  71                      * Removing for now, can consider this as future optimization.
  72                      *
  73                      */
  74                     if (mod.getDataBefore() != null) {
  75                         interfaceMetaUtils.removeFromBridgeRefEntryCache(mod.getDataBefore());
  76                     }
  77                     break;
  78                 case SUBTREE_MODIFIED:
  79                 case WRITE:
  80                     interfaceMetaUtils.addBridgeRefEntryToCache(mod.getDataAfter());
  81                     break;
  82                 default:
  83                     throw new IllegalArgumentException("Unhandled modification type " + mod.getModificationType());
  84             }
  85         }
  86     }
  87 }