Henry Yu | 05dcc21 | 2017-01-05 16:05:26 -0500 | [diff] [blame] | 1 | /* |
Brian O'Connor | a09fe5b | 2017-08-03 21:12:30 -0700 | [diff] [blame] | 2 | * Copyright 2017-present Open Networking Foundation |
Henry Yu | 05dcc21 | 2017-01-05 16:05:26 -0500 | [diff] [blame] | 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.onosproject.provider.te.utils; |
| 18 | |
| 19 | import org.onosproject.net.DeviceId; |
| 20 | import org.onosproject.protocol.restconf.RestconfNotificationEventListener; |
| 21 | import org.slf4j.Logger; |
| 22 | |
| 23 | import java.util.Map; |
| 24 | import java.util.concurrent.ConcurrentHashMap; |
| 25 | |
| 26 | import static org.slf4j.LoggerFactory.getLogger; |
| 27 | |
| 28 | /** |
| 29 | * Implementation of the RESTCONF notification event |
| 30 | * listener for TE Topology. |
| 31 | */ |
| 32 | public class TeTopologyRestconfEventListener implements |
| 33 | RestconfNotificationEventListener<String> { |
| 34 | private static final String TE_TOPOLOGY_NOTIFICATION_PREFIX = |
| 35 | "{\"ietf-te-topology:ietf-te-topology\":"; |
| 36 | private static final String TE_LINK_EVENT_PREFIX = |
| 37 | "{\"ietf-te-topology:te-link-event\":"; |
| 38 | private static final String TE_NODE_EVENT_PREFIX = |
| 39 | "{\"ietf-te-topology:te-node-event\":"; |
| 40 | |
| 41 | private final Logger log = getLogger(getClass()); |
| 42 | |
| 43 | private Map<TeTopologyRestconfEventType, RestconfNotificationEventProcessor> |
| 44 | eventCallbackFunctionMap = new ConcurrentHashMap<>(); |
| 45 | |
| 46 | @Override |
| 47 | public void handleNotificationEvent(DeviceId deviceId, |
| 48 | String eventJsonString) { |
| 49 | log.debug("New notification: {} for device: {}", |
| 50 | eventJsonString, deviceId.toString()); |
| 51 | |
| 52 | if (!eventJsonString.startsWith(TE_TOPOLOGY_NOTIFICATION_PREFIX)) { |
| 53 | // This is not a TE topology event. |
| 54 | return; |
| 55 | } |
| 56 | |
| 57 | String teEventString = removePrefixTagFromJson(eventJsonString, |
| 58 | TE_TOPOLOGY_NOTIFICATION_PREFIX); |
| 59 | |
| 60 | TeTopologyRestconfEventType eventType = getEventType(teEventString); |
| 61 | |
| 62 | if (eventType == TeTopologyRestconfEventType.TE_UNKNOWN_EVENT) { |
| 63 | log.error("handleNotificationEvent: unknown event: {}", eventJsonString); |
| 64 | return; |
| 65 | } |
| 66 | |
| 67 | RestconfNotificationEventProcessor eventProcessor = |
| 68 | eventCallbackFunctionMap.get(eventType); |
| 69 | |
| 70 | if (eventProcessor != null) { |
| 71 | eventProcessor.processEventPayload(teEventString); |
| 72 | } else { |
| 73 | log.info("Event callback not installed for event type: {}", eventType); |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * Registers an notification event callback function which is called by |
| 79 | * the listener when it receives an event. |
| 80 | * |
| 81 | * @param eventType notification event type corresponding to the |
| 82 | * callback function |
| 83 | * @param eventProcessor callback function |
| 84 | */ |
| 85 | public void addCallbackFunction(TeTopologyRestconfEventType eventType, |
| 86 | RestconfNotificationEventProcessor eventProcessor) { |
| 87 | if (eventCallbackFunctionMap.containsKey(eventType)) { |
| 88 | removeCallbackFunction(eventType); |
| 89 | } |
| 90 | |
| 91 | eventCallbackFunctionMap.put(eventType, eventProcessor); |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Removes the callback function associated with the given event type. |
| 96 | * |
| 97 | * @param eventType notification event type |
| 98 | */ |
| 99 | public void removeCallbackFunction(TeTopologyRestconfEventType eventType) { |
| 100 | eventCallbackFunctionMap.remove(eventType); |
| 101 | } |
| 102 | |
| 103 | @Override |
| 104 | public boolean equals(Object o) { |
| 105 | if (this == o) { |
| 106 | return true; |
| 107 | } |
| 108 | if (o == null || getClass() != o.getClass()) { |
| 109 | return false; |
| 110 | } |
| 111 | |
| 112 | TeTopologyRestconfEventListener that = (TeTopologyRestconfEventListener) o; |
| 113 | |
| 114 | return eventCallbackFunctionMap != null ? |
| 115 | eventCallbackFunctionMap.equals(that.eventCallbackFunctionMap) : |
| 116 | that.eventCallbackFunctionMap == null; |
| 117 | } |
| 118 | |
| 119 | @Override |
| 120 | public int hashCode() { |
| 121 | return eventCallbackFunctionMap != null ? eventCallbackFunctionMap.hashCode() : 0; |
| 122 | } |
| 123 | |
| 124 | private String removePrefixTagFromJson(String jsonString, String prefixTag) { |
| 125 | if (jsonString.startsWith(prefixTag)) { |
| 126 | return jsonString.substring(prefixTag.length(), jsonString.length() - 1); |
| 127 | } |
| 128 | return jsonString; |
| 129 | } |
| 130 | |
| 131 | private TeTopologyRestconfEventType getEventType(String teEventString) { |
| 132 | if (teEventString.startsWith(TE_LINK_EVENT_PREFIX)) { |
| 133 | return TeTopologyRestconfEventType.TE_TOPOLOGY_LINK_NOTIFICATION; |
| 134 | } |
| 135 | |
| 136 | if (teEventString.startsWith(TE_NODE_EVENT_PREFIX)) { |
| 137 | return TeTopologyRestconfEventType.TE_TOPOLOGY_NODE_NOTIFICATION; |
| 138 | } |
| 139 | |
| 140 | return TeTopologyRestconfEventType.TE_UNKNOWN_EVENT; |
| 141 | } |
| 142 | } |
| 143 | |