| /** |
| * 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 com.google.protobuf.GeneratedMessage; |
| import org.onosproject.event.ListenerService; |
| import org.onosproject.kafkaintegration.api.dto.OnosEvent.Type; |
| import org.onosproject.kafkaintegration.converter.ConversionFactory; |
| import org.onosproject.kafkaintegration.converter.EventConverter; |
| import org.onosproject.kafkaintegration.impl.KafkaPublisherManager; |
| import org.onosproject.net.device.DeviceEvent; |
| import org.onosproject.net.device.DeviceListener; |
| import org.onosproject.net.device.DeviceService; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import static org.onosproject.kafkaintegration.api.dto.OnosEvent.Type.DEVICE; |
| |
| /** |
| * Listens for ONOS Device events. |
| * |
| */ |
| public final class DeviceEventsListener implements OnosEventListener { |
| |
| private final Logger log = LoggerFactory.getLogger(getClass()); |
| |
| private boolean listenerRunning = false; |
| |
| private InnerListener listener = null; |
| // Exists to defeat instantiation |
| private DeviceEventsListener() { |
| } |
| |
| private static class SingletonHolder { |
| private static final DeviceEventsListener INSTANCE = |
| new DeviceEventsListener(); |
| } |
| |
| /** |
| * Returns a static reference to the Listener Factory. |
| * |
| * @return singleton object |
| */ |
| public static DeviceEventsListener getInstance() { |
| return SingletonHolder.INSTANCE; |
| } |
| |
| @Override |
| public void startListener(Type e, ListenerService<?, ?> service) { |
| if (!listenerRunning) { |
| listener = new InnerListener(); |
| DeviceService deviceService = (DeviceService) service; |
| deviceService.addListener(listener); |
| listenerRunning = true; |
| } |
| } |
| |
| private class InnerListener implements DeviceListener { |
| |
| @Override |
| public void event(DeviceEvent arg0) { |
| |
| // Convert the event to protobuf format |
| ConversionFactory conversionFactory = |
| ConversionFactory.getInstance(); |
| EventConverter converter = conversionFactory.getConverter(DEVICE); |
| GeneratedMessage message = converter.convertToProtoMessage(arg0); |
| |
| // Call Dispatcher and publish event |
| KafkaPublisherManager.getInstance().publish(DEVICE, message); |
| } |
| } |
| |
| @Override |
| public void stopListener(Type e, ListenerService<?, ?> service) { |
| if (listenerRunning) { |
| DeviceService deviceService = (DeviceService) service; |
| deviceService.removeListener(listener); |
| listener = null; |
| listenerRunning = false; |
| } |
| } |
| |
| } |