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Diffstat (limited to 'src/main/java/org/traccar/broadcast/BroadcastService.java')
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diff --git a/src/main/java/org/traccar/broadcast/BroadcastService.java b/src/main/java/org/traccar/broadcast/BroadcastService.java
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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.LifecycleObject;
+import org.traccar.config.Config;
+import org.traccar.config.Keys;
+
+import javax.inject.Inject;
+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.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+public class BroadcastService implements LifecycleObject {
+
+ private static final Logger LOGGER = LoggerFactory.getLogger(BroadcastService.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];
+
+ @Inject
+ public BroadcastService(Config config, ObjectMapper objectMapper) throws IOException {
+ this.objectMapper = objectMapper;
+ address = InetAddress.getByName(config.getString(Keys.BROADCAST_ADDRESS));
+ port = config.getInteger(Keys.BROADCAST_PORT);
+ }
+
+ public void sendMessage(BroadcastMessage message) throws IOException {
+ byte[] buffer = objectMapper.writeValueAsString(message).getBytes(StandardCharsets.UTF_8);
+ DatagramPacket packet = new DatagramPacket(buffer, buffer.length, address, port);
+ publisherSocket.send(packet);
+ }
+
+ private void handleMessage(BroadcastMessage message) {
+ if (message.getDeviceStatus() != null) {
+ LOGGER.info("Broadcast received device {}", message.getDeviceStatus().getDeviceId());
+ } else if (message.getPosition() != null) {
+ LOGGER.info("Broadcast received position {}", message.getPosition().getDeviceId());
+ }
+ }
+
+ @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() {
+ @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);
+ }
+ }
+ };
+
+}