Java tutorial
/* * Copyright 2015 - 2018 Anton Tananaev (anton@traccar.org) * * 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.traccar.database; import io.netty.channel.Channel; import io.netty.util.Timeout; import io.netty.util.TimerTask; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.traccar.Context; import org.traccar.GlobalTimer; import org.traccar.Main; import org.traccar.Protocol; import org.traccar.handler.events.MotionEventHandler; import org.traccar.handler.events.OverspeedEventHandler; import org.traccar.model.Device; import org.traccar.model.DeviceState; import org.traccar.model.Event; import org.traccar.model.Position; import java.net.SocketAddress; import java.sql.SQLException; import java.util.Date; import java.util.HashMap; import java.util.HashSet; import java.util.Map; import java.util.Set; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.TimeUnit; public class ConnectionManager { private static final Logger LOGGER = LoggerFactory.getLogger(ConnectionManager.class); private static final long DEFAULT_TIMEOUT = 600; private final long deviceTimeout; private final boolean enableStatusEvents; private final boolean updateDeviceState; private final Map<Long, ActiveDevice> activeDevices = new ConcurrentHashMap<>(); private final Map<Long, Set<UpdateListener>> listeners = new ConcurrentHashMap<>(); private final Map<Long, Timeout> timeouts = new ConcurrentHashMap<>(); public ConnectionManager() { deviceTimeout = Context.getConfig().getLong("status.timeout", DEFAULT_TIMEOUT) * 1000; enableStatusEvents = Context.getConfig().getBoolean("event.enable"); updateDeviceState = Context.getConfig().getBoolean("status.updateDeviceState"); } public void addActiveDevice(long deviceId, Protocol protocol, Channel channel, SocketAddress remoteAddress) { activeDevices.put(deviceId, new ActiveDevice(deviceId, protocol, channel, remoteAddress)); } public void removeActiveDevice(Channel channel) { for (ActiveDevice activeDevice : activeDevices.values()) { if (activeDevice.getChannel() == channel) { updateDevice(activeDevice.getDeviceId(), Device.STATUS_OFFLINE, null); activeDevices.remove(activeDevice.getDeviceId()); break; } } } public ActiveDevice getActiveDevice(long deviceId) { return activeDevices.get(deviceId); } public void updateDevice(final long deviceId, String status, Date time) { Device device = Context.getIdentityManager().getById(deviceId); if (device == null) { return; } String oldStatus = device.getStatus(); device.setStatus(status); if (enableStatusEvents && !status.equals(oldStatus)) { String eventType; Map<Event, Position> events = new HashMap<>(); switch (status) { case Device.STATUS_ONLINE: eventType = Event.TYPE_DEVICE_ONLINE; break; case Device.STATUS_UNKNOWN: eventType = Event.TYPE_DEVICE_UNKNOWN; if (updateDeviceState) { events.putAll(updateDeviceState(deviceId)); } break; default: eventType = Event.TYPE_DEVICE_OFFLINE; if (updateDeviceState) { events.putAll(updateDeviceState(deviceId)); } break; } events.put(new Event(eventType, deviceId), null); Context.getNotificationManager().updateEvents(events); } Timeout timeout = timeouts.remove(deviceId); if (timeout != null) { timeout.cancel(); } if (time != null) { device.setLastUpdate(time); } if (status.equals(Device.STATUS_ONLINE)) { timeouts.put(deviceId, GlobalTimer.getTimer().newTimeout(new TimerTask() { @Override public void run(Timeout timeout) { if (!timeout.isCancelled()) { updateDevice(deviceId, Device.STATUS_UNKNOWN, null); } } }, deviceTimeout, TimeUnit.MILLISECONDS)); } try { Context.getDeviceManager().updateDeviceStatus(device); } catch (SQLException error) { LOGGER.warn("Update device status error", error); } updateDevice(device); if (status.equals(Device.STATUS_ONLINE) && !oldStatus.equals(Device.STATUS_ONLINE)) { Context.getCommandsManager().sendQueuedCommands(getActiveDevice(deviceId)); } } public Map<Event, Position> updateDeviceState(long deviceId) { DeviceState deviceState = Context.getDeviceManager().getDeviceState(deviceId); Map<Event, Position> result = new HashMap<>(); Map<Event, Position> event = Main.getInjector().getInstance(MotionEventHandler.class) .updateMotionState(deviceState); if (event != null) { result.putAll(event); } event = Main.getInjector().getInstance(OverspeedEventHandler.class).updateOverspeedState(deviceState, Context.getDeviceManager().lookupAttributeDouble(deviceId, OverspeedEventHandler.ATTRIBUTE_SPEED_LIMIT, 0, false)); if (event != null) { result.putAll(event); } return result; } public synchronized void updateDevice(Device device) { for (long userId : Context.getPermissionsManager().getDeviceUsers(device.getId())) { if (listeners.containsKey(userId)) { for (UpdateListener listener : listeners.get(userId)) { listener.onUpdateDevice(device); } } } } public synchronized void updatePosition(Position position) { long deviceId = position.getDeviceId(); for (long userId : Context.getPermissionsManager().getDeviceUsers(deviceId)) { if (listeners.containsKey(userId)) { for (UpdateListener listener : listeners.get(userId)) { listener.onUpdatePosition(position); } } } } public synchronized void updateEvent(long userId, Event event) { if (listeners.containsKey(userId)) { for (UpdateListener listener : listeners.get(userId)) { listener.onUpdateEvent(event); } } } public interface UpdateListener { void onUpdateDevice(Device device); void onUpdatePosition(Position position); void onUpdateEvent(Event event); } public synchronized void addListener(long userId, UpdateListener listener) { if (!listeners.containsKey(userId)) { listeners.put(userId, new HashSet<UpdateListener>()); } listeners.get(userId).add(listener); } public synchronized void removeListener(long userId, UpdateListener listener) { if (!listeners.containsKey(userId)) { listeners.put(userId, new HashSet<UpdateListener>()); } listeners.get(userId).remove(listener); } }