org.opendaylight.controller.config.yang.netconf.mdsal.notification.CapabilityChangeNotificationProducer.java Source code

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Here is the source code for org.opendaylight.controller.config.yang.netconf.mdsal.notification.CapabilityChangeNotificationProducer.java

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/*
 * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */

package org.opendaylight.controller.config.yang.netconf.mdsal.notification;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
import java.util.Collection;
import java.util.Collections;
import java.util.Set;
import javax.annotation.Nonnull;
import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
import org.opendaylight.netconf.notifications.BaseNotificationPublisherRegistration;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Uri;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.netconf.monitoring.rev101004.NetconfState;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.netconf.monitoring.rev101004.netconf.state.Capabilities;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.netconf.notifications.rev120206.NetconfCapabilityChangeBuilder;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.netconf.notifications.rev120206.changed.by.parms.ChangedByBuilder;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.netconf.notifications.rev120206.changed.by.parms.changed.by.server.or.user.ServerBuilder;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;

/**
 * Listens on capabilities changes in data store and publishes them to base
 * netconf notification stream listener.
 */
final class CapabilityChangeNotificationProducer extends OperationalDatastoreListener<Capabilities> {

    private static final InstanceIdentifier<Capabilities> CAPABILITIES_INSTANCE_IDENTIFIER = InstanceIdentifier
            .create(NetconfState.class).child(Capabilities.class);
    private final BaseNotificationPublisherRegistration baseNotificationPublisherRegistration;

    public CapabilityChangeNotificationProducer(
            BaseNotificationPublisherRegistration baseNotificationPublisherRegistration) {
        super(CAPABILITIES_INSTANCE_IDENTIFIER);
        this.baseNotificationPublisherRegistration = baseNotificationPublisherRegistration;
    }

    @Override
    public void onDataTreeChanged(@Nonnull Collection<DataTreeModification<Capabilities>> changes) {
        for (DataTreeModification<Capabilities> change : changes) {
            final DataObjectModification<Capabilities> rootNode = change.getRootNode();
            final DataObjectModification.ModificationType modificationType = rootNode.getModificationType();
            switch (modificationType) {
            case WRITE: {
                final Capabilities dataAfter = rootNode.getDataAfter();
                final Capabilities dataBefore = rootNode.getDataBefore();
                final Set<Uri> before = dataBefore != null ? ImmutableSet.copyOf(dataBefore.getCapability())
                        : Collections.emptySet();
                final Set<Uri> after = dataAfter != null ? ImmutableSet.copyOf(dataAfter.getCapability())
                        : Collections.emptySet();
                final Set<Uri> added = Sets.difference(after, before);
                final Set<Uri> removed = Sets.difference(before, after);
                publishNotification(added, removed);
                break;
            }
            case DELETE: {
                final Capabilities dataBeforeDelete = rootNode.getDataBefore();
                if (dataBeforeDelete != null) {
                    final Set<Uri> removed = ImmutableSet.copyOf(dataBeforeDelete.getCapability());
                    publishNotification(Collections.emptySet(), removed);
                }
                break;
            }
            }
        }

    }

    private void publishNotification(Set<Uri> added, Set<Uri> removed) {
        final NetconfCapabilityChangeBuilder netconfCapabilityChangeBuilder = new NetconfCapabilityChangeBuilder();
        netconfCapabilityChangeBuilder.setChangedBy(
                new ChangedByBuilder().setServerOrUser(new ServerBuilder().setServer(true).build()).build());
        netconfCapabilityChangeBuilder.setAddedCapability(ImmutableList.copyOf(added));
        netconfCapabilityChangeBuilder.setDeletedCapability(ImmutableList.copyOf(removed));
        // TODO modified should be computed ... but why ?
        netconfCapabilityChangeBuilder.setModifiedCapability(Collections.<Uri>emptyList());
        baseNotificationPublisherRegistration.onCapabilityChanged(netconfCapabilityChangeBuilder.build());
    }
}