| /** |
| * 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.kafkaintegration.listener; |
| |
| import static org.onosproject.kafkaintegration.api.dto.OnosEvent.Type.DEVICE; |
| import static org.onosproject.kafkaintegration.api.dto.OnosEvent.Type.LINK; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.onosproject.kafkaintegration.api.dto.OnosEvent.Type; |
| |
| /** |
| * Returns the appropriate listener object based on the ONOS event type. |
| * |
| */ |
| public final class ListenerFactory { |
| |
| // Store listeners for all supported events |
| private Map<Type, OnosEventListener> listeners = |
| new HashMap<Type, OnosEventListener>() { |
| { |
| put(DEVICE, DeviceEventsListener.getInstance()); |
| put(LINK, LinkEventsListener.getInstance()); |
| } |
| }; |
| |
| // Exists to defeat instantiation |
| private ListenerFactory() { |
| } |
| |
| private static class SingletonHolder { |
| private static final ListenerFactory INSTANCE = new ListenerFactory(); |
| } |
| |
| /** |
| * Returns a static reference to the Listener Factory. |
| * |
| * @return singleton object |
| */ |
| public static ListenerFactory getInstance() { |
| return SingletonHolder.INSTANCE; |
| } |
| |
| /** |
| * Returns the listener object for the specified ONOS event type. |
| * |
| * @param event ONOS Event type |
| * @return return listener object |
| */ |
| public OnosEventListener getListener(Type event) { |
| return listeners.get(event); |
| } |
| |
| } |