Simon Hunt | ed804d5 | 2016-03-30 09:51:40 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2016 Open Networking Laboratory |
| 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.ui.impl.topo.model; |
| 18 | |
| 19 | import org.slf4j.Logger; |
| 20 | import org.slf4j.LoggerFactory; |
| 21 | |
| 22 | /** |
| 23 | * A lazily-initialized Singleton that creates and maintains the UI-model |
| 24 | * of the network topology. |
| 25 | */ |
| 26 | public final class UiSharedTopologyModel { |
| 27 | |
| 28 | private static final Logger log = |
| 29 | LoggerFactory.getLogger(UiSharedTopologyModel.class); |
| 30 | |
| 31 | private static UiSharedTopologyModel singleton = null; |
| 32 | |
| 33 | private UiSharedTopologyModel() { |
| 34 | // TODO: set up core model listeners and build the state of the model |
| 35 | } |
| 36 | |
| 37 | public void register(UiTopoLayout layout) { |
| 38 | log.info("Registering topology layout {}", layout); |
| 39 | // TODO: register the view |
| 40 | } |
| 41 | |
| 42 | public void unregister(UiTopoLayout layout) { |
| 43 | log.info("Unregistering topology layout {}", layout); |
| 44 | // TODO: unregister the view |
| 45 | } |
| 46 | |
| 47 | /** |
| 48 | * Returns a reference to the Singleton UI network topology model. |
| 49 | * |
| 50 | * @return the singleton topology model |
| 51 | */ |
| 52 | public static synchronized UiSharedTopologyModel instance() { |
| 53 | if (singleton == null) { |
| 54 | log.info("Instantiating Singleton."); |
| 55 | singleton = new UiSharedTopologyModel(); |
| 56 | } |
| 57 | return singleton; |
| 58 | } |
| 59 | } |