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@Component
@Slf4j
public class ClusterConnectionManager {
@Autowired
private NettyServerConfig config;
@Autowired
private RedisTemplate<String, Object> redisTemplate;
private final Map<String, Channel> clusterChannels = new ConcurrentHashMap<>();
private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(2);
@PostConstruct
public void init() {
connectToClusterNodes();
startHeartbeat();
startStatusSync();
}
private void connectToClusterNodes() {
for (String nodeAddress : config.getClusterNodes()) {
if (isCurrentNode(nodeAddress)) {
continue;
}
try {
connectToNode(nodeAddress);
} catch (Exception e) {
log.error("连接到集群节点失败: nodeAddress={}, error={}",
nodeAddress, e.getMessage(), e);
}
}
}
private void connectToNode(String nodeAddress) {
String[] parts = nodeAddress.split(":");
String host = parts[0];
int port = Integer.parseInt(parts[1]);
EventLoopGroup group = new NioEventLoopGroup();
Bootstrap bootstrap = new Bootstrap();
bootstrap.group(group)
.channel(NioSocketChannel.class)
.option(ChannelOption.TCP_NODELAY, true)
.handler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline pipeline = ch.pipeline();
pipeline.addLast(new LengthFieldBasedFrameDecoder(65535, 0, 4, 0, 4));
pipeline.addLast(new LengthFieldPrepender(4));
pipeline.addLast(new StringDecoder(CharsetUtil.UTF_8));
pipeline.addLast(new StringEncoder(CharsetUtil.UTF_8));
pipeline.addLast(new ClusterChannelHandler());
}
});
ChannelFuture future = bootstrap.connect(host, port);
future.addListener((ChannelFutureListener) f -> {
if (f.isSuccess()) {
clusterChannels.put(nodeAddress, f.channel());
log.info("连接到集群节点成功: nodeAddress={}", nodeAddress);
} else {
log.error("连接到集群节点失败: nodeAddress={}", nodeAddress);
}
});
}
private boolean isCurrentNode(String nodeAddress) {
String currentAddress = getCurrentNodeAddress();
return currentAddress.equals(nodeAddress);
}
private String getCurrentNodeAddress() {
try {
String host = InetAddress.getLocalHost().getHostAddress();
return host + ":" + config.getPort();
} catch (Exception e) {
return "localhost:" + config.getPort();
}
}
private void startHeartbeat() {
scheduler.scheduleAtFixedRate(() -> {
try {
sendHeartbeat();
} catch (Exception e) {
log.error("发送心跳失败: error={}", e.getMessage(), e);
}
}, 5, 10, TimeUnit.SECONDS);
}
private void sendHeartbeat() {
ClusterMessage message = new ClusterMessage();
message.setType("HEARTBEAT");
message.setNodeId(config.getNodeId());
message.setTimestamp(System.currentTimeMillis());
broadcastMessage(message);
String key = "netty:cluster:node:" + config.getNodeId();
redisTemplate.opsForValue().set(key, message, 30, TimeUnit.SECONDS);
}
private void startStatusSync() {
scheduler.scheduleAtFixedRate(() -> {
try {
syncConnectionStatus();
} catch (Exception e) {
log.error("同步连接状态失败: error={}", e.getMessage(), e);
}
}, 10, 30, TimeUnit.SECONDS);
}
private void syncConnectionStatus() {
int connectionCount = getConnectionCount();
String key = "netty:cluster:status:" + config.getNodeId();
Map<String, Object> status = new HashMap<>();
status.put("nodeId", config.getNodeId());
status.put("connectionCount", connectionCount);
status.put("updateTime", System.currentTimeMillis());
redisTemplate.opsForHash().putAll(key, status);
redisTemplate.expire(key, 60, TimeUnit.SECONDS);
}
private int getConnectionCount() {
return 0;
}
public void broadcastMessage(ClusterMessage message) {
String messageStr = JSON.toJSONString(message);
for (Map.Entry<String, Channel> entry : clusterChannels.entrySet()) {
Channel channel = entry.getValue();
if (channel != null && channel.isActive()) {
channel.writeAndFlush(messageStr);
}
}
}
public List<String> getClusterNodes() {
return new ArrayList<>(clusterChannels.keySet());
}
}
@Slf4j
public class ClusterChannelHandler extends ChannelInboundHandlerAdapter {
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
String message = (String) msg;
ClusterMessage clusterMessage = JSON.parseObject(message, ClusterMessage.class);
handleClusterMessage(clusterMessage);
}
private void handleClusterMessage(ClusterMessage message) {
switch (message.getType()) {
case "HEARTBEAT":
log.debug("收到心跳消息: nodeId={}", message.getNodeId());
break;
case "STATUS_SYNC":
log.debug("收到状态同步消息: nodeId={}", message.getNodeId());
break;
default:
log.warn("未知的集群消息类型: type={}", message.getType());
}
}
}
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