1 files changed, 130 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/broadcast/RedisBroadcastService.java b/src/main/java/org/traccar/broadcast/RedisBroadcastService.java
new file mode 100644
index 000000000..e87ad5e61
--- /dev/null
+++ b/src/main/java/org/traccar/broadcast/RedisBroadcastService.java
@@ -0,0 +1,130 @@
+/*
+ * Copyright 2023 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 java.io.IOException;
+import java.util.UUID;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import redis.clients.jedis.Jedis;
+import redis.clients.jedis.JedisPubSub;
+import redis.clients.jedis.exceptions.JedisConnectionException;
+import redis.clients.jedis.exceptions.JedisException;
+
+public class RedisBroadcastService extends BaseBroadcastService {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(RedisBroadcastService.class);
+
+    private final ObjectMapper objectMapper;
+
+    private final ExecutorService service = Executors.newSingleThreadExecutor();
+
+    private final String url;
+    private final String channel = "traccar";
+
+    private Jedis subscriber;
+    private Jedis publisher;
+
+    private final String id = UUID.randomUUID().toString();
+
+    public RedisBroadcastService(Config config, ObjectMapper objectMapper) throws IOException {
+        this.objectMapper = objectMapper;
+        url = config.getString(Keys.BROADCAST_ADDRESS);
+
+        try {
+            subscriber = new Jedis(url);
+            publisher = new Jedis(url);
+            subscriber.connect();
+        } catch (JedisConnectionException e) {
+            throw new IOException(e);
+        }
+    }
+
+    @Override
+    public boolean singleInstance() {
+        return false;
+    }
+
+    @Override
+    protected void sendMessage(BroadcastMessage message) {
+        try {
+            String payload = id  + ":" + objectMapper.writeValueAsString(message);
+            publisher.publish(channel, payload);
+        } catch (IOException e) {
+            LOGGER.warn("Broadcast failed", e);
+        } catch (JedisConnectionException e) {
+            LOGGER.warn("Broadcast failed", e);
+        }
+    }
+
+    @Override
+    public void start() throws IOException {
+        service.submit(receiver);
+    }
+
+    @Override
+    public void stop() {
+        try {
+            if (subscriber != null) {
+                subscriber.close();
+                subscriber = null;
+            }
+        } catch (JedisException e) {
+            LOGGER.warn("Subscriber close failed", e);
+        }
+        try {
+            if (publisher != null) {
+                publisher.close();
+                publisher = null;
+            }
+        } catch (JedisException e) {
+            LOGGER.warn("Publisher close failed", e);
+        }
+        service.shutdown();
+    }
+
+    private final Runnable receiver = new Runnable() {
+        @Override
+        public void run() {
+            try {
+                subscriber.subscribe(new JedisPubSub() {
+                    @Override
+                    public void onMessage(String messageChannel, String message) {
+                        try {
+                            String[] parts = message.split(":", 2);
+                            if (messageChannel.equals(channel) && parts.length == 2 && !id.equals(parts[0])) {
+                                handleMessage(objectMapper.readValue(parts[1], BroadcastMessage.class));
+                            }
+                        } catch (IOException e) {
+                            LOGGER.warn("Broadcast handleMessage failed", e);
+                        }
+                    }
+                }, channel);
+            } catch (JedisConnectionException e) {
+                throw new RuntimeException(e);
+            } catch (JedisException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    };
+
+}