| /* |
| * Copyright 2016 Open Networking Laboratory |
| * |
| * Licensed 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.onosproject.ui.impl.topo.model; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A lazily-initialized Singleton that creates and maintains the UI-model |
| * of the network topology. |
| */ |
| public final class UiSharedTopologyModel { |
| |
| private static final Logger log = |
| LoggerFactory.getLogger(UiSharedTopologyModel.class); |
| |
| private static UiSharedTopologyModel singleton = null; |
| |
| private UiSharedTopologyModel() { |
| // TODO: set up core model listeners and build the state of the model |
| } |
| |
| public void register(UiTopoLayout layout) { |
| log.info("Registering topology layout {}", layout); |
| // TODO: register the view |
| } |
| |
| public void unregister(UiTopoLayout layout) { |
| log.info("Unregistering topology layout {}", layout); |
| // TODO: unregister the view |
| } |
| |
| /** |
| * Returns a reference to the Singleton UI network topology model. |
| * |
| * @return the singleton topology model |
| */ |
| public static synchronized UiSharedTopologyModel instance() { |
| if (singleton == null) { |
| log.info("Instantiating Singleton."); |
| singleton = new UiSharedTopologyModel(); |
| } |
| return singleton; |
| } |
| } |