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阅读这篇文章之前,建议先阅读和这篇文章关联的内容。

1. 详细剖析分布式微服务架构下网络通信的底层实现原理(图解)

2. (年薪60W的技巧)工作了5年,你真的理解Netty以及为什么要用吗?(深度干货)

3. 深度解析Netty中的核心组件(图解+实例)

4. BAT面试必问细节:关于Netty中的ByteBuf详解

5. 通过大量实战案例分解Netty中是如何解决拆包黏包问题的?

6. 基于Netty实现自定义消息通信协议(协议设计及解析应用实战)

7. 全网最详细最齐全的序列化技术及深度解析与应用实战

8. 手把手教你基于Netty实现一个基础的RPC框架(通俗易懂)

在本篇文章中,我们继续围绕Netty手写实现RPC基础篇进行优化,主要引入几个点

  • 集成spring,实现注解驱动配置
  • 集成zookeeper,实现服务注册
  • 增加负载均衡实现

源代码,加「跟着Mic学架构」微信号,回复『rpc』获取。

增加注解驱动

主要涉及到的修改模块

  • netty-rpc-protocol
  • netty-rpc-provider

netty-rpc-protocol

当前模块主要修改的类如下。

image-20210908163139333

图7-1

下面针对netty-rpc-protocol模块的修改如下

增加注解驱动

这个注解的作用是用来指定某些服务为远程服务

@Target(ElementType.TYPE)// Target说明了Annotation所修饰的对象范围, TYPE:用于描述类、接口(包括注解类型) 或enum声明
@Retention(RetentionPolicy.RUNTIME)// Reteniton的作用是定义被它所注解的注解保留多久,保留至运行时。所以我们可以通过反射去获取注解信息。
@Component
public @interface GpRemoteService {

}

SpringRpcProviderBean

这个类主要用来在启动NettyServer,以及保存bean的映射关系

@Slf4j
public class SpringRpcProviderBean implements InitializingBean, BeanPostProcessor {

private final int serverPort;
private final String serverAddress;
public SpringRpcProviderBean(int serverPort) throws UnknownHostException {
this.serverPort = serverPort;
InetAddress address=InetAddress.getLocalHost();
this.serverAddress=address.getHostAddress();
}

@Override
public void afterPropertiesSet() throws Exception {
log.info("begin deploy Netty Server to host {},on port {}",this.serverAddress,this.serverPort);
new Thread(()->{
try {
new NettyServer(this.serverAddress,this.serverPort).startNettyServer();
} catch (Exception e) {
log.error("start Netty Server Occur Exception,",e);
e.printStackTrace();
}
}).start();
}

//bean实例化后调用
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
if(bean.getClass().isAnnotationPresent(GpRemoteService.class)){ //针对存在该注解的服务进行发布
Method[] methods=bean.getClass().getDeclaredMethods();
for(Method method: methods){ //保存需要发布的bean的映射
String key=bean.getClass().getInterfaces()[0].getName()+"."+method.getName();
BeanMethod beanMethod=new BeanMethod();
beanMethod.setBean(bean);
beanMethod.setMethod(method);
Mediator.beanMethodMap.put(key,beanMethod);
}
}
return bean;
}
}

Mediator

主要管理bean以及调用

BeanMethod

@Data
public class BeanMethod {
private Object bean;
private Method method;
}

Mediator

负责持有发布bean的管理,以及bean的反射调用

public class Mediator {
public static Map<String,BeanMethod> beanMethodMap=new ConcurrentHashMap<>();

private volatile static Mediator instance=null;

private Mediator(){
}

public static Mediator getInstance(){
if(instance==null){
synchronized (Mediator.class){
if(instance==null){
instance=new Mediator();
}
}
}
return instance;
}
public Object processor(RpcRequest rpcRequest){
String key=rpcRequest.getClassName()+"."+rpcRequest.getMethodName();
BeanMethod beanMethod=beanMethodMap.get(key);
if(beanMethod==null){
return null;
}
Object bean=beanMethod.getBean();
Method method=beanMethod.getMethod();
try {
return method.invoke(bean,rpcRequest.getParams());
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
return null;
}
}

RpcServerProperties

定义配置属性

@Data
@ConfigurationProperties(prefix = "gp.rpc")
public class RpcServerProperties {

private int servicePort;
}

RpcProviderAutoConfiguration

定义自动配置类

@Configuration
@EnableConfigurationProperties(RpcServerProperties.class)
public class RpcProviderAutoConfiguration {

@Bean
public SpringRpcProviderBean rpcProviderBean(RpcServerProperties rpcServerProperties) throws UnknownHostException {
return new SpringRpcProviderBean(rpcServerProperties.getServicePort());
}
}

修改RpcServerHandler

修改调用方式,直接使用Mediator的调用即可。

public class RpcServerHandler extends SimpleChannelInboundHandler<RpcProtocol<RpcRequest>> {

@Override
protected void channelRead0(ChannelHandlerContext ctx, RpcProtocol<RpcRequest> msg) throws Exception {
RpcProtocol resProtocol=new RpcProtocol<>();
Header header=msg.getHeader();
header.setReqType(ReqType.RESPONSE.code());
Object result=Mediator.getInstance().processor(msg.getContent()); //主要修改这个部分
resProtocol.setHeader(header);
RpcResponse response=new RpcResponse();
response.setData(result);
response.setMsg("success");
resProtocol.setContent(response);

ctx.writeAndFlush(resProtocol);
}
}

netty-rpc-provider

这个模块中主要修改两个部分

  • application.properties
  • NettyRpcProviderMain

NettyRpcProviderMain

@ComponentScan(basePackages = {"com.example.spring.annotation","com.example.spring.service","com.example.service"})
@SpringBootApplication
public class NettyRpcProviderMain {

public static void main(String[] args) throws Exception {
SpringApplication.run(NettyRpcProviderMain.class, args);
//去掉原来的实例化部分
}
}

application.properties

增加一个配置属性。

gp.rpc.servicePort=20880

UserServiceImpl

把当前服务发布出去。

@GpRemoteService //表示将当前服务发布成远程服务
@Slf4j
public class UserServiceImpl implements IUserService {
@Override
public String saveUser(String name) {
log.info("begin saveUser:"+name);
return "Save User Success!";
}
}

修改客户端的注解驱动

客户端同样也需要通过注解的方式来引用服务,这样就能够彻底的屏蔽掉远程通信的细节内容,代码结构如图7-2所示

image-20210908180518683

图7-2

增加客户端注解

在netty-rpc-protocol模块的annotation目录下创建下面这个注解。

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
@Autowired
public @interface GpRemoteReference {
}

SpringRpcReferenceBean

定义工厂Bean,用来构建远程通信的代理

public class SpringRpcReferenceBean implements FactoryBean<Object> {

private Class<?> interfaceClass;
private Object object;
private String serviceAddress;
private int servicePort;

@Override
public Object getObject() throws Exception {
return object;
}

public void init(){
this.object= Proxy.newProxyInstance(this.interfaceClass.getClassLoader(),
new Class<?>[]{this.interfaceClass},
new RpcInvokerProxy(this.serviceAddress,this.servicePort));
}

@Override
public Class<?> getObjectType() {
return this.interfaceClass;
}

public void setInterfaceClass(Class<?> interfaceClass) {
this.interfaceClass = interfaceClass;
}

public void setServiceAddress(String serviceAddress) {
this.serviceAddress = serviceAddress;
}

public void setServicePort(int servicePort) {
this.servicePort = servicePort;
}
}

SpringRpcReferencePostProcessor

用来实现远程Bean的动态代理注入:

  • BeanClassLoaderAware: 获取Bean的类装载器

  • BeanFactoryPostProcessor:在spring容器加载了bean的定义文件之后,在bean实例化之前执行

  • ApplicationContextAware: 获取上下文对象ApplicationContenxt

@Slf4j
public class SpringRpcReferencePostProcessor implements ApplicationContextAware, BeanClassLoaderAware, BeanFactoryPostProcessor {
private ApplicationContext context;
private ClassLoader classLoader;
private RpcClientProperties clientProperties;

public SpringRpcReferencePostProcessor(RpcClientProperties clientProperties) {
this.clientProperties = clientProperties;
}

//保存发布的引用bean信息
private final Map<String, BeanDefinition> rpcRefBeanDefinitions=new ConcurrentHashMap<>();

@Override
public void setBeanClassLoader(ClassLoader classLoader) {
this.classLoader=classLoader;
}
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.context=applicationContext;
}

@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
for (String beanDefinitionname:beanFactory.getBeanDefinitionNames()){
//遍历bean定义,然后获取到加载的bean,遍历这些bean中的字段,是否携带GpRemoteReference注解
//如果有,则需要构建一个动态代理实现
BeanDefinition beanDefinition=beanFactory.getBeanDefinition(beanDefinitionname);
String beanClassName=beanDefinition.getBeanClassName();
if(beanClassName!=null){
//和forName方法相同,内部就是直接调用的forName方法
Class<?> clazz=ClassUtils.resolveClassName(beanClassName,this.classLoader);
//针对当前类中的指定字段,动态创建一个Bean
ReflectionUtils.doWithFields(clazz,this::parseRpcReference);
}
}
//将@GpRemoteReference注解的bean,构建一个动态代理对象
BeanDefinitionRegistry registry=(BeanDefinitionRegistry)beanFactory;
this.rpcRefBeanDefinitions.forEach((beanName,beanDefinition)->{
if(context.containsBean(beanName)){
log.warn("SpringContext already register bean {}",beanName);
return;
}
//把动态创建的bean注册到容器中
registry.registerBeanDefinition(beanName,beanDefinition);
log.info("registered RpcReferenceBean {} success.",beanName);
});
}
private void parseRpcReference(Field field){
GpRemoteReference gpRemoteReference=AnnotationUtils.getAnnotation(field,GpRemoteReference.class);
if(gpRemoteReference!=null) {
BeanDefinitionBuilder builder=BeanDefinitionBuilder.genericBeanDefinition(SpringRpcReferenceBean.class);
builder.setInitMethodName(RpcConstant.INIT_METHOD_NAME);
builder.addPropertyValue("interfaceClass",field.getType());
builder.addPropertyValue("serviceAddress",clientProperties.getServiceAddress());
builder.addPropertyValue("servicePort",clientProperties.getServicePort());
BeanDefinition beanDefinition=builder.getBeanDefinition();
rpcRefBeanDefinitions.put(field.getName(),beanDefinition);
}
}
}

需要在RpcConstant常量中增加一个INIT_METHOD_NAME属性

public class RpcConstant {
//header部分的总字节数
public final static int HEAD_TOTAL_LEN=16;
//魔数
public final static short MAGIC=0xca;

public static final String INIT_METHOD_NAME = "init";
}

RpcClientProperties

@Data
public class RpcClientProperties {

private String serviceAddress="192.168.1.102";

private int servicePort=20880;
}

RpcRefernceAutoConfiguration

@Configuration
public class RpcRefernceAutoConfiguration implements EnvironmentAware{

@Bean
public SpringRpcReferencePostProcessor postProcessor(){
String address=environment.getProperty("gp.serviceAddress");
int port=Integer.parseInt(environment.getProperty("gp.servicePort"));
RpcClientProperties rc=new RpcClientProperties();
rc.setServiceAddress(address);
rc.setServicePort(port);
return new SpringRpcReferencePostProcessor(rc);
}

private Environment environment;

@Override
public void setEnvironment(Environment environment) {
this.environment=environment;
}
}

netty-rpc-consumer

修改netty-rpc-consumer模块

  • 把该模块变成一个spring boot项目
  • 增加web依赖
  • 添加测试类

image-20210908183814586

图7-3 netty-rpc-consumer模块

引入jar包依赖

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

HelloController

@RestController
public class HelloController {

@GpRemoteReference
private IUserService userService;

@GetMapping("/test")
public String test(){
return userService.saveUser("Mic");
}
}

NettyConsumerMain

@ComponentScan(basePackages = {"com.example.spring.annotation","com.example.controller","com.example.spring.reference"})
@SpringBootApplication
public class NettyConsumerMain {
public static void main(String[] args) {
SpringApplication.run(NettyConsumerMain.class, args);
}
}

application.properties

gp.serviceAddress=192.168.1.102
servicePort.servicePort=20880

访问测试

  • 启动Netty-Rpc-Server
  • 启动Netty-Rpc-Consumer

如果启动过程没有任何问题,则可以访问HelloController来测试远程服务的访问。

引入注册中心

创建一个netty-rpc-registry模块,代码结构如图7-4所示。

image-20210909174008427

引入相关依赖

<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-framework</artifactId>
<version>4.2.0</version>
</dependency>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-recipes</artifactId>
<version>4.2.0</version>
</dependency>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-x-discovery</artifactId>
<version>4.2.0</version>
</dependency>

IRegistryService

public interface IRegistryService {

/**
* 注册服务
* @param serviceInfo
* @throws Exception
*/
void register(ServiceInfo serviceInfo) throws Exception;

/**
* 取消注册
* @param serviceInfo
* @throws Exception
*/
void unRegister(ServiceInfo serviceInfo) throws Exception;

/**
* 动态发现服务
* @param serviceName
* @return
* @throws Exception
*/
ServiceInfo discovery(String serviceName) throws Exception;
}

ServiceInfo

@Data
public class ServiceInfo {
private String serviceName;
private String serviceAddress;
private int servicePort;
}

ZookeeperRegistryService

@Slf4j
public class ZookeeperRegistryService implements IRegistryService {

private static final String REGISTRY_PATH="/registry";
//Curator中提供的服务注册与发现的组件封装,它对此抽象出了ServiceInstance、
// ServiceProvider、ServiceDiscovery三个接口,通过它我们可以很轻易的实现Service Discovery
private final ServiceDiscovery<ServiceInfo> serviceDiscovery;

private ILoadBalance<ServiceInstance<ServiceInfo>> loadBalance;

public ZookeeperRegistryService(String registryAddress) throws Exception {
CuratorFramework client= CuratorFrameworkFactory
.newClient(registryAddress,new ExponentialBackoffRetry(1000,3));
JsonInstanceSerializer<ServiceInfo> serializer=new JsonInstanceSerializer<>(ServiceInfo.class);
this.serviceDiscovery= ServiceDiscoveryBuilder.builder(ServiceInfo.class)
.client(client)
.serializer(serializer)
.basePath(REGISTRY_PATH)
.build();
this.serviceDiscovery.start();
loadBalance=new RandomLoadBalance();
}

@Override
public void register(ServiceInfo serviceInfo) throws Exception {
log.info("开始注册服务,{}",serviceInfo);
ServiceInstance<ServiceInfo> serviceInstance=ServiceInstance
.<ServiceInfo>builder().name(serviceInfo.getServiceName())
.address(serviceInfo.getServiceAddress())
.port(serviceInfo.getServicePort())
.payload(serviceInfo)
.build();
serviceDiscovery.registerService(serviceInstance);
}

@Override
public void unRegister(ServiceInfo serviceInfo) throws Exception {
ServiceInstance<ServiceInfo> serviceInstance=ServiceInstance.<ServiceInfo>builder()
.name(serviceInfo.getServiceName())
.address(serviceInfo.getServiceAddress())
.port(serviceInfo.getServicePort())
.payload(serviceInfo)
.build();
serviceDiscovery.unregisterService(serviceInstance);
}

@Override
public ServiceInfo discovery(String serviceName) throws Exception {
Collection<ServiceInstance<ServiceInfo>> serviceInstances= serviceDiscovery
.queryForInstances(serviceName);
//通过负载均衡返回某个具体实例
ServiceInstance<ServiceInfo> serviceInstance=loadBalance.select((List<ServiceInstance<ServiceInfo>>)serviceInstances);
if(serviceInstance!=null){
return serviceInstance.getPayload();
}
return null;
}
}

引入负载均衡算法

由于服务端发现服务时可能有多个,所以需要用到负载均衡算法来实现

ILoadBalance

public interface ILoadBalance<T> {

T select(List<T> servers);
}

AbstractLoadBalance

public abstract class AbstractLoadBanalce implements ILoadBalance<ServiceInstance<ServiceInfo>> {

@Override
public ServiceInstance<ServiceInfo> select(List<ServiceInstance<ServiceInfo>> servers){
if(servers==null||servers.size()==0){
return null;
}
if(servers.size()==1){
return servers.get(0);
}
return doSelect(servers);
}

protected abstract ServiceInstance<ServiceInfo> doSelect(List<ServiceInstance<ServiceInfo>> servers);
}

RandomLoadBalance

public class RandomLoadBalance extends AbstractLoadBanalce {
@Override
protected ServiceInstance<ServiceInfo> doSelect(List<ServiceInstance<ServiceInfo>> servers) {
int length=servers.size();
Random random=new Random();
return servers.get(random.nextInt(length));
}
}

RegistryType

public enum RegistryType {

ZOOKEEPER((byte)0),
EUREKA((byte)1);

private byte code;

RegistryType(byte code) {
this.code=code;
}

public byte code(){
return this.code;
}

public static RegistryType findByCode(byte code) {
for (RegistryType rt : RegistryType.values()) {
if (rt.code() == code) {
return rt;
}
}
return null;
}
}

RegistryFactory

public class RegistryFactory {

public static IRegistryService createRegistryService(String address,RegistryType registryType){
IRegistryService registryService=null;
try {
switch (registryType) {
case ZOOKEEPER:
registryService = new ZookeeperRegistryService(address);
break;
case EUREKA:
//TODO
break;
default:
registryService = new ZookeeperRegistryService(address);
break;
}
}catch (Exception e){
e.printStackTrace();
}
return registryService;
}
}

修改服务端增加服务注册

修改netty-rpc-protocol模块,加入注册中心的支持

SpringRpcProviderBean

按照下面case标注部分,表示要修改的内容

@Slf4j
public class SpringRpcProviderBean implements InitializingBean, BeanPostProcessor {

private final int serverPort;
private final String serverAddress;
private final IRegistryService registryService; //修改部分,增加注册中心实现
public SpringRpcProviderBean(int serverPort,IRegistryService registryService) throws UnknownHostException {
this.serverPort = serverPort;
InetAddress address=InetAddress.getLocalHost();
this.serverAddress=address.getHostAddress();
this.registryService=registryService; //修改部分,增加注册中心实现
}

@Override
public void afterPropertiesSet() throws Exception {
log.info("begin deploy Netty Server to host {},on port {}",this.serverAddress,this.serverPort);
new Thread(()->{
try {
new NettyServer(this.serverAddress,this.serverPort).startNettyServer();
} catch (Exception e) {
log.error("start Netty Server Occur Exception,",e);
e.printStackTrace();
}
}).start();
}

@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
if(bean.getClass().isAnnotationPresent(GpRemoteService.class)){ //针对存在该注解的服务进行发布
Method[] methods=bean.getClass().getDeclaredMethods();
for(Method method: methods){
String serviceName=bean.getClass().getInterfaces()[0].getName();
String key=serviceName+"."+method.getName();
BeanMethod beanMethod=new BeanMethod();
beanMethod.setBean(bean);
beanMethod.setMethod(method);
Mediator.beanMethodMap.put(key,beanMethod);
try {
//修改部分,增加注册中心实现
ServiceInfo serviceInfo = new ServiceInfo();
serviceInfo.setServiceAddress(this.serverAddress);
serviceInfo.setServicePort(this.serverPort);
serviceInfo.setServiceName(serviceName);
registryService.register(serviceInfo);//修改部分,增加注册中心实现
}catch (Exception e){
log.error("register service {} faild",serviceName,e);
}
}
}
return bean;
}
}

RpcServerProperties

修改RpcServerProperties,增加注册中心的配置

@Data
@ConfigurationProperties(prefix = "gp.rpc")
public class RpcServerProperties {

private int servicePort;

private byte registerType;

private String registryAddress;
}

RpcProviderAutoConfiguration

增加注册中心的注入。

@Configuration
@EnableConfigurationProperties(RpcServerProperties.class)
public class RpcProviderAutoConfiguration {

@Bean
public SpringRpcProviderBean rpcProviderBean(RpcServerProperties rpcServerProperties) throws UnknownHostException {
//添加注册中心
IRegistryService registryService=RegistryFactory.createRegistryService(rpcServerProperties.getRegistryAddress(), RegistryType.findByCode(rpcServerProperties.getRegisterType()));
return new SpringRpcProviderBean(rpcServerProperties.getServicePort(),registryService);
}
}

application.properties

修改netty-rpc-provider中的application.properties。

gp.rpc.servicePort=20880
gp.rpc.registerType=0
gp.rpc.registryAddress=192.168.221.128:2181

修改客户端,增加服务发现

客户端需要修改的地方较多,下面这些修改的代码,都是netty-rpc-protocol模块中的类。

RpcClientProperties

增加注册中心类型和注册中心地址的选项

@Data
public class RpcClientProperties {

private String serviceAddress="192.168.1.102";

private int servicePort=20880;

private byte registryType;

private String registryAddress;

}

修改NettyClient

原本是静态地址,现在修改成了从注册中心获取地址

@Slf4j
public class NettyClient {
private final Bootstrap bootstrap;
private final EventLoopGroup eventLoopGroup=new NioEventLoopGroup();
/* private String serviceAddress;
private int servicePort;*/
public NettyClient(){
log.info("begin init NettyClient");
bootstrap=new Bootstrap();
bootstrap.group(eventLoopGroup)
.channel(NioSocketChannel.class)
.handler(new RpcClientInitializer());
/* this.serviceAddress=serviceAddress;
this.servicePort=servicePort;*/
}

public void sendRequest(RpcProtocol<RpcRequest> protocol, IRegistryService registryService) throws Exception {
ServiceInfo serviceInfo=registryService.discovery(protocol.getContent().getClassName());
ChannelFuture future=bootstrap.connect(serviceInfo.getServiceAddress(),serviceInfo.getServicePort()).sync();
future.addListener(listener->{
if(future.isSuccess()){
log.info("connect rpc server {} success.",serviceInfo.getServiceAddress());
}else{
log.error("connect rpc server {} failed .",serviceInfo.getServiceAddress());
future.cause().printStackTrace();
eventLoopGroup.shutdownGracefully();
}
});
log.info("begin transfer data");
future.channel().writeAndFlush(protocol);
}
}

修改RpcInvokerProxy

将静态ip和地址,修改成IRegistryService

@Slf4j
public class RpcInvokerProxy implements InvocationHandler {

/* private String serviceAddress;
private int servicePort;*/

IRegistryService registryService;

public RpcInvokerProxy(IRegistryService registryService) {
/* this.serviceAddress = serviceAddress;
this.servicePort = servicePort;*/
this.registryService=registryService;
}

@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
log.info("begin invoke target server");
//组装参数
RpcProtocol<RpcRequest> protocol=new RpcProtocol<>();
long requestId= RequestHolder.REQUEST_ID.incrementAndGet();
Header header=new Header(RpcConstant.MAGIC, SerialType.JSON_SERIAL.code(), ReqType.REQUEST.code(),requestId,0);
protocol.setHeader(header);
RpcRequest request=new RpcRequest();
request.setClassName(method.getDeclaringClass().getName());
request.setMethodName(method.getName());
request.setParameterTypes(method.getParameterTypes());
request.setParams(args);
protocol.setContent(request);
//发送请求
NettyClient nettyClient=new NettyClient();
//构建异步数据处理
RpcFuture<RpcResponse> future=new RpcFuture<>(new DefaultPromise<>(new DefaultEventLoop()));
RequestHolder.REQUEST_MAP.put(requestId,future);
nettyClient.sendRequest(protocol,this.registryService);
return future.getPromise().get().getData();
}
}

SpringRpcReferenceBean

修改引用bean,增加注册中心配置

public class SpringRpcReferenceBean implements FactoryBean<Object> {

private Class<?> interfaceClass;
private Object object;
/* private String serviceAddress;
private int servicePort;*/
//修改增加注册中心
private byte registryType;
private String registryAddress;

@Override
public Object getObject() throws Exception {
return object;
}

public void init(){
//修改增加注册中心
IRegistryService registryService= RegistryFactory.createRegistryService(this.registryAddress, RegistryType.findByCode(this.registryType));
this.object= Proxy.newProxyInstance(this.interfaceClass.getClassLoader(),
new Class<?>[]{this.interfaceClass},
new RpcInvokerProxy(registryService));
}

@Override
public Class<?> getObjectType() {
return this.interfaceClass;
}

public void setInterfaceClass(Class<?> interfaceClass) {
this.interfaceClass = interfaceClass;
}

/* public void setServiceAddress(String serviceAddress) {
this.serviceAddress = serviceAddress;
}

public void setServicePort(int servicePort) {
this.servicePort = servicePort;
}*/

public void setRegistryType(byte registryType) {
this.registryType = registryType;
}

public void setRegistryAddress(String registryAddress) {
this.registryAddress = registryAddress;
}
}

SpringRpcReferencePostProcessor

@Slf4j
public class SpringRpcReferencePostProcessor implements ApplicationContextAware, BeanClassLoaderAware, BeanFactoryPostProcessor {
private ApplicationContext context;
private ClassLoader classLoader;
private RpcClientProperties clientProperties;

public SpringRpcReferencePostProcessor(RpcClientProperties clientProperties) {
this.clientProperties = clientProperties;
}

//保存发布的引用bean信息
private final Map<String, BeanDefinition> rpcRefBeanDefinitions=new ConcurrentHashMap<>();

@Override
public void setBeanClassLoader(ClassLoader classLoader) {
this.classLoader=classLoader;
}
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.context=applicationContext;
}

@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
for (String beanDefinitionname:beanFactory.getBeanDefinitionNames()){
//遍历bean定义,然后获取到加载的bean,遍历这些bean中的字段,是否携带GpRemoteReference注解
//如果有,则需要构建一个动态代理实现
BeanDefinition beanDefinition=beanFactory.getBeanDefinition(beanDefinitionname);
String beanClassName=beanDefinition.getBeanClassName();
if(beanClassName!=null){
Class<?> clazz=ClassUtils.resolveClassName(beanClassName,this.classLoader);
ReflectionUtils.doWithFields(clazz,this::parseRpcReference);
}
}
//将@GpRemoteReference注解的bean,构建一个动态代理对象
BeanDefinitionRegistry registry=(BeanDefinitionRegistry)beanFactory;
this.rpcRefBeanDefinitions.forEach((beanName,beanDefinition)->{
if(context.containsBean(beanName)){
log.warn("SpringContext already register bean {}",beanName);
return;
}
registry.registerBeanDefinition(beanName,beanDefinition);
log.info("registered RpcReferenceBean {} success.",beanName);
});
}
private void parseRpcReference(Field field){
GpRemoteReference gpRemoteReference=AnnotationUtils.getAnnotation(field,GpRemoteReference.class);
if(gpRemoteReference!=null) {
BeanDefinitionBuilder builder=BeanDefinitionBuilder.genericBeanDefinition(SpringRpcReferenceBean.class);
builder.setInitMethodName(RpcConstant.INIT_METHOD_NAME);
builder.addPropertyValue("interfaceClass",field.getType());
/*builder.addPropertyValue("serviceAddress",clientProperties.getServiceAddress());
builder.addPropertyValue("servicePort",clientProperties.getServicePort());*/
builder.addPropertyValue("registryType",clientProperties.getRegistryType());
builder.addPropertyValue("registryAddress",clientProperties.getRegistryAddress());
BeanDefinition beanDefinition=builder.getBeanDefinition();
rpcRefBeanDefinitions.put(field.getName(),beanDefinition);
}
}
}

RpcRefernceAutoConfiguration

@Configuration
public class RpcRefernceAutoConfiguration implements EnvironmentAware{

@Bean
public SpringRpcReferencePostProcessor postProcessor(){
String address=environment.getProperty("gp.serviceAddress");
int port=Integer.parseInt(environment.getProperty("gp.servicePort"));
RpcClientProperties rc=new RpcClientProperties();
rc.setServiceAddress(address);
rc.setServicePort(port);
rc.setRegistryType(Byte.parseByte(environment.getProperty("gp.registryType")));
rc.setRegistryAddress(environment.getProperty("gp.registryAddress"));
return new SpringRpcReferencePostProcessor(rc);
}

private Environment environment;

@Override
public void setEnvironment(Environment environment) {
this.environment=environment;
}
}

application.properties

修改netty-rpc-consumer模块中的配置

gp.serviceAddress=192.168.1.102
gp.servicePort=20880

gp.registryType=0
gp.registryAddress=192.168.221.128:2181

负载均衡的测试

增加一个服务端的启动类,并且修改端口。然后客户端不需要重启的情况下刷新浏览器,即可看到负载均衡的效果。

image-20210909202149527

图7-5

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