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/*
* 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 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;
String 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 | 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 (Exception e) {
LOGGER.warn("Broadcast handleMessage failed", e);
}
}
}, channel);
} catch (JedisException e) {
throw new RuntimeException(e);
}
}
};
}
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