2 * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.netconf.server.events.mdsal;
10 import static java.util.Objects.requireNonNull;
12 import org.opendaylight.mdsal.binding.api.DataBroker;
13 import org.opendaylight.mdsal.binding.api.DataTreeChangeListener;
14 import org.opendaylight.mdsal.binding.api.DataTreeIdentifier;
15 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
16 import org.opendaylight.yangtools.concepts.ListenerRegistration;
17 import org.opendaylight.yangtools.yang.binding.DataObject;
18 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
21 * Abstract base class for subclasses, which want to listen for changes on specified subtree in operational datastore.
23 * @param <T> data object class
25 abstract class OperationalDatastoreListener<T extends DataObject> implements DataTreeChangeListener<T> {
26 private final InstanceIdentifier<T> instanceIdentifier;
31 * @param instanceIdentifier instance identifier of subtree, on which this instance should listen on changes.
33 OperationalDatastoreListener(final InstanceIdentifier<T> instanceIdentifier) {
34 this.instanceIdentifier = requireNonNull(instanceIdentifier);
38 * Registers this instance as OPERATIONAL datastore listener via provided dataBroker.
40 * @param dataBroker data broker
41 * @return listener registration
43 ListenerRegistration<OperationalDatastoreListener<T>> registerOnChanges(final DataBroker dataBroker) {
44 DataTreeIdentifier<T> id = DataTreeIdentifier.create(LogicalDatastoreType.OPERATIONAL, instanceIdentifier);
45 return dataBroker.registerDataTreeChangeListener(id, this);