Implement cluster broadcasting

3 files changed, 194 insertions, 0 deletions

diff --git a/src/main/java/org/traccar/broadcast/BroadcastMessage.java b/src/main/java/org/traccar/broadcast/BroadcastMessage.java
new file mode 100644
index 000000000..6b103f373
--- /dev/null
+++ b/src/main/java/org/traccar/broadcast/BroadcastMessage.java
@@ -0,0 +1,42 @@
+/*
+ * 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 org.traccar.model.Position;
+
+public class BroadcastMessage {
+
+    private DeviceStatus deviceStatus;
+
+    public DeviceStatus getDeviceStatus() {
+        return deviceStatus;
+    }
+
+    public void setDeviceStatus(DeviceStatus deviceStatus) {
+        this.deviceStatus = deviceStatus;
+    }
+
+    private Position position;
+
+    public Position getPosition() {
+        return position;
+    }
+
+    public void setPosition(Position position) {
+        this.position = position;
+    }
+
+}
diff --git a/src/main/java/org/traccar/broadcast/BroadcastService.java b/src/main/java/org/traccar/broadcast/BroadcastService.java
new file mode 100644
index 000000000..b17857fcd
--- /dev/null
+++ b/src/main/java/org/traccar/broadcast/BroadcastService.java
@@ -0,0 +1,100 @@
+/*
+ * 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);
+            }
+        }
+    };
+
+}
diff --git a/src/main/java/org/traccar/broadcast/DeviceStatus.java b/src/main/java/org/traccar/broadcast/DeviceStatus.java
new file mode 100644
index 000000000..4f0143319
--- /dev/null
+++ b/src/main/java/org/traccar/broadcast/DeviceStatus.java
@@ -0,0 +1,52 @@
+/*
+ * 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 java.util.Date;
+
+public class DeviceStatus {
+
+    private long deviceId;
+
+    public long getDeviceId() {
+        return deviceId;
+    }
+
+    public void setDeviceId(long deviceId) {
+        this.deviceId = deviceId;
+    }
+
+    private String status;
+
+    public String getStatus() {
+        return status;
+    }
+
+    public void setStatus(String status) {
+        this.status = status;
+    }
+
+    private Date lastUpdate;
+
+    public Date getLastUpdate() {
+        return this.lastUpdate;
+    }
+
+    public void setLastUpdate(Date lastUpdate) {
+        this.lastUpdate = lastUpdate;
+    }
+
+}