| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.onlab.onos.metrics.topology.cli; |
| |
| import java.util.List; |
| |
| import com.fasterxml.jackson.databind.JsonNode; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import com.fasterxml.jackson.databind.node.ArrayNode; |
| import com.fasterxml.jackson.databind.node.ObjectNode; |
| import org.apache.karaf.shell.commands.Command; |
| import org.onlab.onos.cli.AbstractShellCommand; |
| import org.onlab.onos.event.Event; |
| import org.onlab.onos.metrics.topology.TopologyMetricsService; |
| import org.onlab.onos.net.topology.TopologyEvent; |
| |
| /** |
| * Command to show the list of last topology events. |
| */ |
| @Command(scope = "onos", name = "topology-events", |
| description = "Lists the last topology events") |
| public class TopologyEventsListCommand extends AbstractShellCommand { |
| |
| private static final String FORMAT_EVENT = "Event=%s"; |
| private static final String FORMAT_REASON = " Reason=%s"; |
| |
| @Override |
| protected void execute() { |
| TopologyMetricsService service = get(TopologyMetricsService.class); |
| |
| if (outputJson()) { |
| print("%s", json(service.getEvents())); |
| } else { |
| for (Event event : service.getEvents()) { |
| print(FORMAT_EVENT, event); |
| if (event instanceof TopologyEvent) { |
| TopologyEvent topologyEvent = (TopologyEvent) event; |
| for (Event reason : topologyEvent.reasons()) { |
| print(FORMAT_REASON, reason); |
| } |
| } |
| print(""); // Extra empty line for clarity |
| } |
| } |
| } |
| |
| /** |
| * Produces a JSON array of topology events. |
| * |
| * @param events the topology events with the data |
| * @return JSON array with the topology events |
| */ |
| private JsonNode json(List<Event> events) { |
| ObjectMapper mapper = new ObjectMapper(); |
| ArrayNode result = mapper.createArrayNode(); |
| |
| for (Event event : events) { |
| result.add(json(mapper, event)); |
| } |
| return result; |
| } |
| |
| /** |
| * Produces JSON object for a topology event. |
| * |
| * @param mapper the JSON object mapper to use |
| * @param topologyEvent the topology event with the data |
| * @return JSON object for the topology event |
| */ |
| private ObjectNode json(ObjectMapper mapper, Event event) { |
| ObjectNode result = mapper.createObjectNode(); |
| |
| result.put("time", event.time()) |
| .put("type", event.type().toString()) |
| .put("event", event.toString()); |
| |
| // Add the reasons if a TopologyEvent |
| if (event instanceof TopologyEvent) { |
| TopologyEvent topologyEvent = (TopologyEvent) event; |
| ArrayNode reasons = mapper.createArrayNode(); |
| for (Event reason : topologyEvent.reasons()) { |
| reasons.add(json(mapper, reason)); |
| } |
| result.put("reasons", reasons); |
| } |
| |
| return result; |
| } |
| } |