2 * Copyright (c) 2015 - 2016 Ericsson India Global Services Pvt Ltd. 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.vpnservice;
10 import com.google.common.base.Optional;
11 import com.google.common.base.Preconditions;
13 import org.opendaylight.controller.md.sal.binding.api.DataChangeListener;
14 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeEvent;
15 import org.opendaylight.yangtools.yang.binding.DataObject;
16 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
17 import org.slf4j.Logger;
18 import org.slf4j.LoggerFactory;
20 import java.util.Collections;
25 * AbstractDataChangeListener implemented basic {@link DataChangeListener} processing for
26 * VPN related Data Objects.
28 public abstract class AbstractDataChangeListener<T extends DataObject> implements DataChangeListener {
30 protected final Class<T> clazz;
32 private static final Logger LOG = LoggerFactory.getLogger(AbstractDataChangeListener.class);
35 * @param clazz - for which the data change event is received
37 public AbstractDataChangeListener(Class<T> clazz) {
38 this.clazz = Preconditions.checkNotNull(clazz, "Class can not be null!");
42 public void onDataChanged(final AsyncDataChangeEvent<InstanceIdentifier<?>, DataObject> changeEvent) {
44 Preconditions.checkNotNull(changeEvent,"Async ChangeEvent can not be null!");
46 /* All DataObjects for create */
47 final Map<InstanceIdentifier<?>, DataObject> createdData = changeEvent.getCreatedData() != null
48 ? changeEvent.getCreatedData() : Collections.<InstanceIdentifier<?>, DataObject>emptyMap();
49 /* All DataObjects for remove */
50 final Set<InstanceIdentifier<?>> removeData = changeEvent.getRemovedPaths() != null
51 ? changeEvent.getRemovedPaths() : Collections.<InstanceIdentifier<?>>emptySet();
52 /* All DataObjects for updates */
53 final Map<InstanceIdentifier<?>, DataObject> updateData = changeEvent.getUpdatedData() != null
54 ? changeEvent.getUpdatedData() : Collections.<InstanceIdentifier<?>, DataObject>emptyMap();
55 /* All Original DataObjects */
56 final Map<InstanceIdentifier<?>, DataObject> originalData = changeEvent.getOriginalData() != null
57 ? changeEvent.getOriginalData() : Collections.<InstanceIdentifier<?>, DataObject>emptyMap();
59 this.createData(createdData);
60 this.updateData(updateData, originalData);
61 this.removeData(removeData, originalData);
63 } catch (Throwable e) {
64 if (LOG.isTraceEnabled()) {
65 LOG.trace("failed to handle dcn ", e);
70 @SuppressWarnings("unchecked")
71 private void createData(final Map<InstanceIdentifier<?>, DataObject> createdData) {
72 final Set<InstanceIdentifier<?>> keys = createdData.keySet() != null
73 ? createdData.keySet() : Collections.<InstanceIdentifier<?>>emptySet();
74 for (InstanceIdentifier<?> key : keys) {
75 if (clazz.equals(key.getTargetType())) {
76 InstanceIdentifier<T> createKeyIdent = key.firstIdentifierOf(clazz);
77 final Optional<DataObject> value = Optional.of(createdData.get(key));
78 if (value.isPresent()) {
79 this.add(createKeyIdent, (T)value.get());
85 @SuppressWarnings("unchecked")
86 private void updateData(final Map<InstanceIdentifier<?>, DataObject> updateData,
87 final Map<InstanceIdentifier<?>, DataObject> originalData) {
89 final Set<InstanceIdentifier<?>> keys = updateData.keySet() != null
90 ? updateData.keySet() : Collections.<InstanceIdentifier<?>>emptySet();
91 for (InstanceIdentifier<?> key : keys) {
92 if (clazz.equals(key.getTargetType())) {
93 InstanceIdentifier<T> updateKeyIdent = key.firstIdentifierOf(clazz);
94 final Optional<DataObject> value = Optional.of(updateData.get(key));
95 final Optional<DataObject> original = Optional.of(originalData.get(key));
96 if (value.isPresent() && original.isPresent()) {
97 this.update(updateKeyIdent, (T)original.get(), (T)value.get());
103 @SuppressWarnings("unchecked")
104 private void removeData(final Set<InstanceIdentifier<?>> removeData,
105 final Map<InstanceIdentifier<?>, DataObject> originalData) {
107 for (InstanceIdentifier<?> key : removeData) {
108 if (clazz.equals(key.getTargetType())) {
109 final InstanceIdentifier<T> ident = key.firstIdentifierOf(clazz);
110 final DataObject removeValue = originalData.get(key);
111 this.remove(ident, (T)removeValue);
116 protected abstract void remove(InstanceIdentifier<T> identifier, T del);
118 protected abstract void update(InstanceIdentifier<T> identifier, T original, T update);
120 protected abstract void add(InstanceIdentifier<T> identifier, T add);