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diff --git a/src/main/java/org/traccar/session/ConnectionManager.java b/src/main/java/org/traccar/session/ConnectionManager.java
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+/*
+ * Copyright 2015 - 2022 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.session;
+
+import io.netty.channel.Channel;
+import io.netty.util.Timeout;
+import io.netty.util.Timer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.traccar.Context;
+import org.traccar.Main;
+import org.traccar.Protocol;
+import org.traccar.config.Keys;
+import org.traccar.handler.events.MotionEventHandler;
+import org.traccar.handler.events.OverspeedEventHandler;
+import org.traccar.model.Device;
+import org.traccar.model.Event;
+import org.traccar.model.Position;
+import org.traccar.storage.StorageException;
+
+import java.net.SocketAddress;
+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 final long deviceTimeout;
+ 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<>();
+
+ private final Timer timer;
+
+ public ConnectionManager() {
+ deviceTimeout = Context.getConfig().getLong(Keys.STATUS_TIMEOUT) * 1000;
+ updateDeviceState = Context.getConfig().getBoolean(Keys.STATUS_UPDATE_DEVICE_STATE);
+ timer = Main.getInjector().getInstance(Timer.class);
+ }
+
+ 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 (!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, timer.newTimeout(timeout1 -> {
+ if (!timeout1.isCancelled()) {
+ updateDevice(deviceId, Device.STATUS_UNKNOWN, null);
+ }
+ }, deviceTimeout, TimeUnit.MILLISECONDS));
+ }
+
+ try {
+ Context.getDeviceManager().updateDeviceStatus(device);
+ } catch (StorageException e) {
+ LOGGER.warn("Update device status error", e);
+ }
+
+ updateDevice(device);
+ }
+
+ 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, true, false));
+ if (event != null) {
+ result.putAll(event);
+ }
+
+ return result;
+ }
+
+ public synchronized void sendKeepalive() {
+ for (Set<UpdateListener> userListeners : listeners.values()) {
+ for (UpdateListener listener : userListeners) {
+ listener.onKeepalive();
+ }
+ }
+ }
+
+ 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 onKeepalive();
+ 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<>());
+ }
+ listeners.get(userId).add(listener);
+ }
+
+ public synchronized void removeListener(long userId, UpdateListener listener) {
+ if (!listeners.containsKey(userId)) {
+ listeners.put(userId, new HashSet<>());
+ }
+ listeners.get(userId).remove(listener);
+ }
+
+}