--- /dev/null
+/*
+ * 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.messagebus.app.impl;
+
+import com.google.common.base.Preconditions;
+import java.util.Map;
+import java.util.regex.Pattern;
+import org.opendaylight.controller.md.sal.binding.api.DataChangeListener;
+import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeEvent;
+import org.opendaylight.yang.gen.v1.urn.cisco.params.xml.ns.yang.messagebus.eventaggregator.rev141202.NotificationPattern;
+import org.opendaylight.yang.gen.v1.urn.cisco.params.xml.ns.yang.messagebus.eventaggregator.rev141202.TopicId;
+import org.opendaylight.yang.gen.v1.urn.cisco.params.xml.ns.yang.messagebus.eventsource.rev141202.EventSourceService;
+import org.opendaylight.yang.gen.v1.urn.cisco.params.xml.ns.yang.messagebus.eventsource.rev141202.JoinTopicInput;
+import org.opendaylight.yang.gen.v1.urn.cisco.params.xml.ns.yang.messagebus.eventsource.rev141202.JoinTopicInputBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeRef;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.Node;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.LoggerFactory;
+
+public class EventSourceTopic implements DataChangeListener {
+ private static final org.slf4j.Logger LOG = LoggerFactory.getLogger(EventSourceTopic.class);
+ private final NotificationPattern notificationPattern;
+ private final EventSourceService sourceService;
+ private final Pattern nodeIdPattern;
+ private final TopicId topicId;
+
+ public EventSourceTopic(final NotificationPattern notificationPattern, final String nodeIdPattern, final EventSourceService eventSource) {
+ this.notificationPattern = Preconditions.checkNotNull(notificationPattern);
+ this.sourceService = eventSource;
+
+ // FIXME: regex should be the language of nodeIdPattern
+ final String regex = Util.wildcardToRegex(nodeIdPattern);
+ this.nodeIdPattern = Pattern.compile(regex);
+
+
+ // FIXME: We need to perform some salting in order to make
+ // the topic IDs less predictable.
+ this.topicId = new TopicId(Util.md5String(notificationPattern + nodeIdPattern));
+ }
+
+ public TopicId getTopicId() {
+ return topicId;
+ }
+
+ @Override
+ public void onDataChanged(final AsyncDataChangeEvent<InstanceIdentifier<?>, DataObject> event) {
+ for (final Map.Entry<InstanceIdentifier<?>, DataObject> changeEntry : event.getUpdatedData().entrySet()) {
+ if (changeEntry.getValue() instanceof Node) {
+ final Node node = (Node) changeEntry.getValue();
+ if (nodeIdPattern.matcher(node.getId().getValue()).matches()) {
+ notifyNode(changeEntry.getKey());
+ }
+ }
+ }
+ }
+
+ public void notifyNode(final InstanceIdentifier<?> nodeId) {
+ try {
+ sourceService.joinTopic(getJoinTopicInputArgument(nodeId));
+ } catch (final Exception e) {
+ LOG.error("Could not invoke join topic for node {}", nodeId);
+ }
+ }
+
+ private JoinTopicInput getJoinTopicInputArgument(final InstanceIdentifier<?> path) {
+ final NodeRef nodeRef = new NodeRef(path);
+ final JoinTopicInput jti =
+ new JoinTopicInputBuilder()
+ .setNode(nodeRef.getValue())
+ .setTopicId(topicId)
+ .setNotificationPattern(notificationPattern)
+ .build();
+ return jti;
+ }
+
+
+}