2 * Copyright (c) 2015 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
9 package org.opendaylight.groupbasedpolicy.resolver;
11 import java.io.Closeable;
12 import java.io.IOException;
13 import java.util.Collection;
15 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
16 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
17 import org.opendaylight.controller.md.sal.binding.api.DataTreeChangeListener;
18 import org.opendaylight.controller.md.sal.binding.api.DataTreeIdentifier;
19 import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
20 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
21 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.common.rev140421.TenantId;
22 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.Renderers;
23 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.renderers.Renderer;
24 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.renderers.renderer.Interests;
25 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.renderers.renderer.interests.FollowedTenants;
26 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.renderer.rev151103.renderers.renderer.interests.followed.tenants.FollowedTenant;
27 import org.opendaylight.yangtools.concepts.ListenerRegistration;
28 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
30 import com.google.common.collect.HashMultiset;
31 import com.google.common.collect.Multiset;
33 public class FollowedTenantListener implements DataTreeChangeListener<FollowedTenant>, Closeable {
35 private final PolicyResolver policyResolver;
36 private final ListenerRegistration<FollowedTenantListener> listenerRegistration;
37 private final Multiset<TenantId> countedFollowedTenants = HashMultiset.create();
39 public FollowedTenantListener(DataBroker dataProvider, PolicyResolver policyResolver) {
40 this.policyResolver = policyResolver;
41 listenerRegistration = dataProvider.registerDataTreeChangeListener(
42 new DataTreeIdentifier<>(LogicalDatastoreType.OPERATIONAL,
43 InstanceIdentifier.builder(Renderers.class)
44 .child(Renderer.class)
45 .child(Interests.class)
46 .child(FollowedTenants.class)
47 .child(FollowedTenant.class)
53 public void onDataTreeChanged(Collection<DataTreeModification<FollowedTenant>> changes) {
54 for (DataTreeModification<FollowedTenant> change : changes) {
55 DataObjectModification<FollowedTenant> rootNode = change.getRootNode();
56 TenantId tenantId = change.getRootPath().getRootIdentifier().firstKeyOf(FollowedTenant.class).getId();
57 switch (rootNode.getModificationType()) {
59 policyResolver.subscribeTenant(tenantId);
60 countedFollowedTenants.add(tenantId);
63 countedFollowedTenants.remove(tenantId);
64 if (countedFollowedTenants.count(tenantId) == 0) {
65 policyResolver.unsubscribeTenant(tenantId);
68 case SUBTREE_MODIFIED:
76 public void close() throws IOException {
77 if (listenerRegistration != null)
78 listenerRegistration.close();