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Springboot整合Netty实现RPC服务器_springboot rpc

springboot rpc

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4. 网络通信框架的选择

=============

出于性能的考虑,RPC一般选择异步非阻塞的网络通信方式,JDK自带的NIO网络编程操作繁杂,Netty是一款基于NIO开发的网络通信框架,其对java NIO进行封装对外提供友好的API,并且内置了很多开箱即用的组件,如各种编码解码器。所以我们采用Netty作为RPC服务的网络通信框架。

三、RPC服务端

========

RPC分为客户端和服务端,它们有一个共同的服务接口API,我们首先定义一个接口 HelloService

public interface HelloService {

String sayHello(String name);

}

然后服务端需要提供该接口的实现类,然后使用自定义的@RpcService注解标注,该注解扩展自@Component,被其标注的类可以被Spring的容器管理。

@RpcService

public class HelloServiceImp implements HelloService {

@Override

public String sayHello(String name) {

return "Hello " + name;

}

}

@Target(ElementType.TYPE)

@Retention(RetentionPolicy.RUNTIME)

@Component

public @interface RpcService {

}

RPC服务器类

我们实现了ApplicationContextAware接口,以便从bean容器中取出@RpcService实现类,存入我们的map容器中。

@Component

@Slf4j

public class RpcServer implements ApplicationContextAware, InitializingBean {

// RPC服务实现容器

private Map<String, Object> rpcServices = new HashMap<>();

@Value(“${rpc.server.port}”)

private int port;

@Override

public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {

Map<String, Object> services = applicationContext.getBeansWithAnnotation(RpcService.class);

for (Map.Entry<String, Object> entry : services.entrySet()) {

Object bean = entry.getValue();

Class<?>[] interfaces = bean.getClass().getInterfaces();

for (Class<?> inter : interfaces) {

rpcServices.put(inter.getName(), bean);

}

}

log.info(“加载RPC服务数量:{}”, rpcServices.size());

}

@Override

public void afterPropertiesSet() {

start();

}

private void start(){

new Thread(() -> {

EventLoopGroup boss = new NioEventLoopGroup(1);

EventLoopGroup worker = new NioEventLoopGroup();

try {

ServerBootstrap bootstrap = new ServerBootstrap();

bootstrap.group(boss, worker)

.childHandler(new ChannelInitializer() {

@Override

protected void initChannel(SocketChannel ch) throws Exception {

ChannelPipeline pipeline = ch.pipeline();

pipeline.addLast(new IdleStateHandler(0, 0, 60));

pipeline.addLast(new JsonDecoder());

pipeline.addLast(new JsonEncoder());

pipeline.addLast(new RpcInboundHandler(rpcServices));

}

})

.channel(NioServerSocketChannel.class);

ChannelFuture future = bootstrap.bind(port).sync();

log.info(“RPC 服务器启动, 监听端口:” + port);

future.channel().closeFuture().sync();

}catch (Exception e){

e.printStackTrace();

boss.shutdownGracefully();

worker.shutdownGracefully();

}

}).start();

}

}

RpcServerInboundHandler 负责处理RPC请求

@Slf4j

public class RpcServerInboundHandler extends ChannelInboundHandlerAdapter {

private Map<String, Object> rpcServices;

public RpcServerInboundHandler(Map<String, Object> rpcServices){

this.rpcServices = rpcServices;

}

@Override

public void channelActive(ChannelHandlerContext ctx) throws Exception {

log.info(“客户端连接成功,{}”, ctx.channel().remoteAddress());

}

public void channelInactive(ChannelHandlerContext ctx) {

log.info(“客户端断开连接,{}”, ctx.channel().remoteAddress());

ctx.channel().close();

}

@Override

public void channelRead(ChannelHandlerContext ctx, Object msg){

RpcRequest rpcRequest = (RpcRequest) msg;

log.info(“接收到客户端请求, 请求接口:{}, 请求方法:{}”, rpcRequest.getClassName(), rpcRequest.getMethodName());

RpcResponse response = new RpcResponse();

response.setRequestId(rpcRequest.getRequestId());

Object result = null;

try {

result = this.handleRequest(rpcRequest);

response.setResult(result);

} catch (Exception e) {

e.printStackTrace();

response.setSuccess(false);

response.setErrorMessage(e.getMessage());

}

log.info(“服务器响应:{}”, response);

ctx.writeAndFlush(response);

}

@Override

public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {

log.info(“连接异常”);

ctx.channel().close();

super.exceptionCaught(ctx, cause);

}

@Override

public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {

if (evt instanceof IdleStateEvent){

IdleStateEvent event = (IdleStateEvent)evt;

if (event.state()== IdleState.ALL_IDLE){

log.info(“客户端已超过60秒未读写数据, 关闭连接.{}”,ctx.channel().remoteAddress());

ctx.channel().close();

}

}else{

super.userEventTriggered(ctx,evt);

}

}

private Object handleRequest(RpcRequest rpcRequest) throws Exception{

Object bean = rpcServices.get(rpcRequest.getClassName());

if(bean == null){

throw new RuntimeException("未找到对应的服务: " + rpcRequest.getClassName());

}

Method method = bean.getClass().getMethod(rpcRequest.getMethodName(), rpcRequest.getParameterTypes());

method.setAccessible(true);

return method.invoke(bean, rpcRequest.getParameters());

}

}

四、RPC客户端

========

/**

  • RPC远程调用的客户端

*/

@Slf4j

@Component

public class RpcClient {

@Value(“${rpc.remote.ip}”)

private String remoteIp;

@Value(“${rpc.remote.port}”)

private int port;

private Bootstrap bootstrap;

// 储存调用结果

private final Map<String, SynchronousQueue> results = new ConcurrentHashMap<>();

public RpcClient(){

}

@PostConstruct

public void init(){

bootstrap = new Bootstrap().remoteAddress(remoteIp, port);

NioEventLoopGroup worker = new NioEventLoopGroup(1);

bootstrap.group(worker)

.channel(NioSocketChannel.class)

.handler(new ChannelInitializer() {

@Override

protected void initChannel(SocketChannel channel) throws Exception {

ChannelPipeline pipeline = channel.pipeline();

pipeline.addLast(new IdleStateHandler(0, 0, 10));

pipeline.addLast(new JsonEncoder());

pipeline.addLast(new JsonDecoder());

pipeline.addLast(new RpcClientInboundHandler(results));

}

});

}

public RpcResponse send(RpcRequest rpcRequest) {

RpcResponse rpcResponse = null;

rpcRequest.setRequestId(UUID.randomUUID().toString());

Channel channel = null;

try {

channel = bootstrap.connect().sync().channel();

log.info(“连接建立, 发送请求:{}”, rpcRequest);

channel.writeAndFlush(rpcRequest);

SynchronousQueue queue = new SynchronousQueue<>();

results.put(rpcRequest.getRequestId(), queue);

// 阻塞等待获取响应

rpcResponse = queue.take();

results.remove(rpcRequest.getRequestId());

} catch (InterruptedException e) {

e.printStackTrace();

} finally {

if(channel != null && channel.isActive()){

channel.close();

}

}

return rpcResponse;

}

}

RpcClientInboundHandler负责处理服务端的响应

@Slf4j

public class RpcClientInboundHandler extends ChannelInboundHandlerAdapter {

private Map<String, SynchronousQueue> results;

public RpcClientInboundHandler(Map<String, SynchronousQueue> results){

this.results = results;

}

@Override

public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {

RpcResponse rpcResponse = (RpcResponse) msg;

log.info(“收到服务器响应:{}”, rpcResponse);

if(!rpcResponse.isSuccess()){

throw new RuntimeException(“调用结果异常,异常信息:” + rpcResponse.getErrorMessage());

}

// 取出结果容器,将response放进queue中

SynchronousQueue queue = results.get(rpcResponse.getRequestId());

queue.put(rpcResponse);

}

@Override

public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {

if (evt instanceof IdleStateEvent){

IdleStateEvent event = (IdleStateEvent)evt;

if (event.state() == IdleState.ALL_IDLE){

log.info(“发送心跳包”);

RpcRequest request = new RpcRequest();

request.setMethodName(“heartBeat”);

ctx.channel().writeAndFlush(request);

}

}else{

super.userEventTriggered(ctx, evt);

}

}

@Override

public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause){

log.info(“异常:{}”, cause.getMessage());

ctx.channel().close();

}

}

接口代理

为了使客户端像调用本地方法一样调用远程服务,我们需要对接口进行动态代理。

代理类实现

@Component

public class RpcProxy implements InvocationHandler {

@Autowired

private RpcClient rpcClient;

@Override

public Object invoke(Object proxy, Method method, Object[] args){

RpcRequest rpcRequest = new RpcRequest();

rpcRequest.setClassName(method.getDeclaringClass().getName());

rpcRequest.setMethodName(method.getName());

rpcRequest.setParameters(args);

rpcRequest.setParameterTypes(method.getParameterTypes());

RpcResponse rpcResponse = rpcClient.send(rpcRequest);

return rpcResponse.getResult();

}

}

实现FactoryBean接口,将生产动态代理类纳入 Spring 容器管理。

public class RpcFactoryBean implements FactoryBean {

private Class interfaceClass;

@Autowired

private RpcProxy rpcProxy;

public RpcFactoryBean(Class interfaceClass){

this.interfaceClass = interfaceClass;

}

@Override

public T getObject(){

return (T) Proxy.newProxyInstance(interfaceClass.getClassLoader(), new Class[]{interfaceClass}, rpcProxy);

}

@Override

public Class<?> getObjectType() {

return interfaceClass;

}

}

自定义类路径扫描器,扫描包下的RPC接口,动态生产代理类,纳入 Spring 容器管理

public class RpcScanner extends ClassPathBeanDefinitionScanner {

public RpcScanner(BeanDefinitionRegistry registry) {

super(registry);

}

@Override

protected Set doScan(String… basePackages) {

Set beanDefinitionHolders = super.doScan(basePackages);

for (BeanDefinitionHolder beanDefinitionHolder : beanDefinitionHolders) {

GenericBeanDefinition beanDefinition = (GenericBeanDefinition)beanDefinitionHolder.getBeanDefinition();

beanDefinition.getConstructorArgumentValues().addGenericArgumentValue(beanDefinition.getBeanClassName());

beanDefinition.setBeanClassName(RpcFactoryBean.class.getName());

}

return beanDefinitionHolders;

}

@Override

protected boolean isCandidateComponent(MetadataReader metadataReader) throws IOException {

return true;

}

@Override

protected boolean isCandidateComponent(AnnotatedBeanDefinition beanDefinition) {

return beanDefinition.getMetadata().isInterface() && beanDefinition.getMetadata().isIndependent();

}

}

@Component

public class RpcBeanDefinitionRegistryPostProcessor implements BeanDefinitionRegistryPostProcessor {

@Override

public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {

RpcScanner rpcScanner = new RpcScanner(registry);

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