Spring Cloud 是基于 Spring Boot 提供的一系列框架,用于快速构建分布式系统的工具包。它涵盖了微服务架构中的常见问题,包括配置管理、服务发现、负载均衡、断路器、智能路由、微代理、控制总线、全局锁、领导选举、分布式会话和集群状态等。
Netty 是一个高性能、事件驱动的异步网络应用框架,可以用于快速开发高性能、可伸缩的网络应用。Netty 集群的构建涉及多个 Netty 节点协同工作,以实现负载均衡、故障转移和高可用性。
3.1 配置 ZooKeeper ZooKeeper 用于存储集群节点的信息,通常包括节点的 IP 和端口号。以下是一个简单的 ZooKeeper 配置例子:
propertiestickTime=2000
dataDir=/var/lib/zookeeper
clientPort=2181
initLimit=5
syncLimit=2
server.1=zookeeper1:2888:3888
server.2=zookeeper2:2888:3888
server.3=zookeeper3:2888:3888
3.2 Netty 客户端配置 使用 Netty 创建客户端时,需要指定连接的服务器地址和端口。可以从 ZooKeeper 获取这些信息。
javapublic class NettyClient {
private final String host;
private final int port;
public NettyClient(String host, int port) {
this.host = host;
this.port = port;
}
public void start() throws InterruptedException {
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap bootstrap = new Bootstrap();
bootstrap.group(group)
.channel(NioSocketChannel.class)
.handler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel ch) {
ch.pipeline().addLast(new ClientHandler());
}
});
ChannelFuture future = bootstrap.connect(host, port).sync();
future.channel().closeFuture().sync();
} finally {
group.shutdownGracefully();
}
}
}
3.3 负载均衡和故障转移 可以使用一致性哈希算法实现负载均衡,并结合 ZooKeeper 监控节点的健康状态。
SpringCloud+Netty集群实战千万级 IM系统-服务器代码
javapublic class NettyServer {
private final int port;
public NettyServer(int port) {
this.port = port;
}
public void start() throws InterruptedException {
EventLoopGroup bossGroup = new NioEventLoopGroup(1);
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel ch) {
ch.pipeline().addLast(new ServerHandler());
}
});
ChannelFuture f = b.bind(port).sync();
f.channel().closeFuture().sync();
} finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
}
SpringCloud+Netty集群实战千万级 IM系统-客户端代码
javapublic class NettyClient {
private final String host;
private final int port;
public NettyClient(String host, int port) {
this.host = host;
this.port = port;
}
public void start() throws InterruptedException {
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap bootstrap = new Bootstrap();
bootstrap.group(group)
.channel(NioSocketChannel.class)
.handler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel ch) {
ch.pipeline().addLast(new ClientHandler());
}
});
ChannelFuture future = bootstrap.connect(host, port).sync();
future.channel().closeFuture().sync();
} finally {
group.shutdownGracefully();
}
}
}
原创声明:本文系作者授权腾讯云开发者社区发表,未经许可,不得转载。
如有侵权,请联系 cloudcommunity@tencent.com 删除。
原创声明:本文系作者授权腾讯云开发者社区发表,未经许可,不得转载。
如有侵权,请联系 cloudcommunity@tencent.com 删除。