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/*
* Copyright 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.broadcast;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.traccar.config.Config;
import org.traccar.config.Keys;
import org.traccar.model.BaseModel;
import org.traccar.model.Device;
import org.traccar.model.Event;
import org.traccar.model.Permission;
import org.traccar.model.Position;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.MulticastSocket;
import java.nio.charset.StandardCharsets;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class MulticastBroadcastService implements BroadcastService {
private static final Logger LOGGER = LoggerFactory.getLogger(MulticastBroadcastService.class);
private final ObjectMapper objectMapper;
private final InetAddress address;
private final int port;
private DatagramSocket publisherSocket;
private final ExecutorService service = Executors.newSingleThreadExecutor();
private final byte[] receiverBuffer = new byte[4096];
private final Set<BroadcastInterface> listeners = new HashSet<>();
public MulticastBroadcastService(Config config, ObjectMapper objectMapper) throws IOException {
this.objectMapper = objectMapper;
address = InetAddress.getByName(config.getString(Keys.BROADCAST_ADDRESS));
port = config.getInteger(Keys.BROADCAST_PORT);
}
@Override
public void registerListener(BroadcastInterface listener) {
listeners.add(listener);
}
@Override
public void updateDevice(Device device) {
BroadcastMessage message = new BroadcastMessage();
message.setDevice(device);
sendMessage(message);
}
@Override
public void updatePosition(Position position) {
BroadcastMessage message = new BroadcastMessage();
message.setPosition(position);
sendMessage(message);
}
@Override
public void updateEvent(long userId, Event event) {
BroadcastMessage message = new BroadcastMessage();
message.setUserId(userId);
message.setEvent(event);
sendMessage(message);
}
@Override
public void invalidateObject(Class<? extends BaseModel> clazz, long id) {
BroadcastMessage message = new BroadcastMessage();
message.setChanges(Map.of(Permission.getKey(clazz), id));
sendMessage(message);
}
@Override
public void invalidatePermission(
Class<? extends BaseModel> clazz1, long id1,
Class<? extends BaseModel> clazz2, long id2) {
BroadcastMessage message = new BroadcastMessage();
message.setChanges(Map.of(Permission.getKey(clazz1), id1, Permission.getKey(clazz2), id2));
sendMessage(message);
}
private void sendMessage(BroadcastMessage message) {
try {
byte[] buffer = objectMapper.writeValueAsString(message).getBytes(StandardCharsets.UTF_8);
DatagramPacket packet = new DatagramPacket(buffer, buffer.length, address, port);
publisherSocket.send(packet);
} catch (IOException e) {
LOGGER.warn("Broadcast failed", e);
}
}
private void handleMessage(BroadcastMessage message) {
if (message.getDevice() != null) {
listeners.forEach(listener -> listener.updateDevice(message.getDevice()));
} else if (message.getPosition() != null) {
listeners.forEach(listener -> listener.updatePosition(message.getPosition()));
} else if (message.getUserId() != null && message.getEvent() != null) {
listeners.forEach(listener -> listener.updateEvent(message.getUserId(), message.getEvent()));
} else if (message.getChanges() != null) {
var iterator = message.getChanges().entrySet().iterator();
if (iterator.hasNext()) {
var first = iterator.next();
if (iterator.hasNext()) {
var second = iterator.next();
listeners.forEach(listener -> listener.invalidatePermission(
Permission.getKeyClass(first.getKey()), first.getValue(),
Permission.getKeyClass(second.getKey()), second.getValue()));
} else {
listeners.forEach(listener -> listener.invalidateObject(
Permission.getKeyClass(first.getKey()), first.getValue()));
}
}
}
}
@Override
public void start() throws IOException {
service.submit(receiver);
publisherSocket = new DatagramSocket();
}
@Override
public void stop() {
publisherSocket.close();
service.shutdown();
}
private final Runnable receiver = new Runnable() {
@SuppressWarnings("deprecation")
@Override
public void run() {
try (MulticastSocket socket = new MulticastSocket(port)) {
socket.joinGroup(address);
while (!service.isShutdown()) {
DatagramPacket packet = new DatagramPacket(receiverBuffer, receiverBuffer.length);
socket.receive(packet);
String data = new String(packet.getData(), 0, packet.getLength(), StandardCharsets.UTF_8);
handleMessage(objectMapper.readValue(data, BroadcastMessage.class));
}
socket.leaveGroup(address);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
};
}
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