mappingservice/neutron/src/main/java/org/opendaylight/lispflowmapping/neutron/DelegatingDataTreeListener.java

   1 /*
   2  * Copyright (c) 2016 Cisco Systems, Inc. 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 package org.opendaylight.lispflowmapping.neutron;
   9
  10 import com.google.common.base.Preconditions;
  11 import java.util.Collection;
  12 import javax.annotation.Nonnull;
  13 import org.opendaylight.mdsal.binding.api.ClusteredDataTreeChangeListener;
  14 import org.opendaylight.mdsal.binding.api.DataBroker;
  15 import org.opendaylight.mdsal.binding.api.DataObjectModification;
  16 import org.opendaylight.mdsal.binding.api.DataTreeIdentifier;
  17 import org.opendaylight.mdsal.binding.api.DataTreeModification;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.networks.rev150712.networks.attributes.networks.Network;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.ports.rev150712.ports.attributes.ports.Port;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.subnets.rev150712.subnets.attributes.subnets.Subnet;
  21 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  22 import org.opendaylight.yangtools.yang.binding.DataObject;
  23 import org.slf4j.Logger;
  24 import org.slf4j.LoggerFactory;
  25
  26 public class DelegatingDataTreeListener<T extends DataObject> implements ClusteredDataTreeChangeListener<T>,
  27         AutoCloseable {
  28     private static final Logger LOG = LoggerFactory.getLogger(DelegatingDataTreeListener.class);
  29     private final DataProcessor<T> dataProcessor;
  30     private ListenerRegistration<ClusteredDataTreeChangeListener<T>> dataTreeChangeListenerRegistration;
  31
  32     public DelegatingDataTreeListener(DataProcessor<T> dataProcessor, DataBroker dataBroker, DataTreeIdentifier<T>
  33             dataTreeIdentifier) {
  34         Preconditions.checkNotNull(dataBroker, "Can not instantiate Listener! Broker is null!");
  35         Preconditions.checkNotNull(dataTreeIdentifier, "DataTreeIndentifier can not be null!");
  36         this.dataProcessor = dataProcessor;
  37         dataTreeChangeListenerRegistration = dataBroker.registerDataTreeChangeListener(dataTreeIdentifier ,this);
  38     }
  39
  40     public static <T extends DataObject> DelegatingDataTreeListener initiateListener(
  41             Class<T> dataObject, ILispNeutronService lispNeutronService, DataBroker dataBroker) {
  42
  43         if (dataObject == Network.class) {
  44             return new NetworkListener(new NetworkDataProcessor(lispNeutronService), dataBroker);
  45         } else if (dataObject == Subnet.class) {
  46             return new SubnetListener(new SubnetDataProcessor(lispNeutronService), dataBroker);
  47         } else if (dataObject == Port.class) {
  48             return new PortListener(new PortDataProcessor(lispNeutronService), dataBroker);
  49         }
  50         LOG.debug(dataObject.getName() + " listener can not be instantiated.");
  51         return null;
  52     }
  53
  54     @Override
  55     public void onDataTreeChanged(@Nonnull Collection<DataTreeModification<T>> changes) {
  56         for (DataTreeModification<T> change : changes) {
  57             DataObjectModification<T> mod = change.getRootNode();
  58
  59             if (mod.getModificationType() == DataObjectModification.ModificationType.WRITE) {
  60                 T object = mod.getDataAfter();
  61                 dataProcessor.create(object);
  62                 LOG.info(object.toString() + " created.");
  63             } else if (mod.getModificationType() == DataObjectModification.ModificationType.DELETE) {
  64                 T object = mod.getDataBefore();
  65                 dataProcessor.delete(object);
  66                 LOG.info(object.toString() + " removed.");
  67             } else {
  68                 T object = mod.getDataAfter();
  69                 dataProcessor.update(object);
  70                 LOG.info(object.toString() + " updated.");
  71             }
  72         }
  73     }
  74
  75     @Override
  76     public void close() throws Exception {
  77         if (dataTreeChangeListenerRegistration != null) {
  78             dataTreeChangeListenerRegistration.close();
  79             dataTreeChangeListenerRegistration = null;
  80
  81             LOG.info(this.toString() + " closed");
  82         }
  83     }
  84 }