| /* |
| * Copyright 2017-present Open Networking Foundation |
| * |
| * 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.routing; |
| |
| import org.onosproject.net.DeviceId; |
| import org.onosproject.net.device.DeviceEvent; |
| import org.onosproject.net.device.DeviceListener; |
| import org.onosproject.net.device.DeviceService; |
| |
| import java.util.Map; |
| import java.util.Optional; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| /** |
| * Provides a means of asynchronously waiting on devices. |
| */ |
| public final class AsyncDeviceFetcher { |
| |
| private DeviceService deviceService; |
| |
| private DeviceListener listener = new InternalDeviceListener(); |
| |
| private Map<DeviceId, Runnable> onConnect = new ConcurrentHashMap<>(); |
| private Map<DeviceId, Runnable> onDisconnect = new ConcurrentHashMap<>(); |
| |
| private AsyncDeviceFetcher(DeviceService deviceService) { |
| this.deviceService = checkNotNull(deviceService); |
| deviceService.addListener(listener); |
| } |
| |
| /** |
| * Shuts down. |
| */ |
| public void shutdown() { |
| deviceService.removeListener(listener); |
| onConnect.clear(); |
| onDisconnect.clear(); |
| } |
| |
| /** |
| * Executes provided callback when given device connects/disconnects. |
| * @param deviceId device ID |
| * @param onConnect callback that will be executed immediately if the device |
| * is currently online, or when the device becomes online |
| * @param onDisconnect callback that will be executed when the device becomes offline |
| */ |
| void registerCallback(DeviceId deviceId, Runnable onConnect, Runnable onDisconnect) { |
| if (onConnect != null) { |
| if (deviceService.isAvailable(deviceId)) { |
| onConnect.run(); |
| } |
| this.onConnect.put(deviceId, onConnect); |
| } |
| if (onDisconnect != null) { |
| this.onDisconnect.put(deviceId, onDisconnect); |
| } |
| } |
| |
| /** |
| * Creates a device fetcher based on the device service. |
| * |
| * @param deviceService device service |
| * @return device fetcher |
| */ |
| public static AsyncDeviceFetcher create(DeviceService deviceService) { |
| return new AsyncDeviceFetcher(deviceService); |
| } |
| |
| private class InternalDeviceListener implements DeviceListener { |
| @Override |
| public void event(DeviceEvent event) { |
| switch (event.type()) { |
| case DEVICE_ADDED: |
| case DEVICE_AVAILABILITY_CHANGED: |
| DeviceId deviceId = event.subject().id(); |
| if (deviceService.isAvailable(deviceId)) { |
| Optional.ofNullable(onConnect.get(deviceId)).ifPresent(Runnable::run); |
| } else { |
| Optional.ofNullable(onDisconnect.get(deviceId)).ifPresent(Runnable::run); |
| } |
| break; |
| case DEVICE_UPDATED: |
| case DEVICE_REMOVED: |
| case DEVICE_SUSPENDED: |
| case PORT_ADDED: |
| case PORT_UPDATED: |
| case PORT_REMOVED: |
| default: |
| break; |
| } |
| } |
| } |
| } |