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Diffstat (limited to 'src/main/java/org/traccar/broadcast/MulticastBroadcastService.java')
-rw-r--r--src/main/java/org/traccar/broadcast/MulticastBroadcastService.java170
1 files changed, 170 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/broadcast/MulticastBroadcastService.java b/src/main/java/org/traccar/broadcast/MulticastBroadcastService.java
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+++ b/src/main/java/org/traccar/broadcast/MulticastBroadcastService.java
@@ -0,0 +1,170 @@
+/*
+ * 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);
+ }
+ }
+ };
+}