一,简单一点的过程解说图(不太清晰,凑合看吧)

自己手动写一个RPC框架_ide

Gitee仓库源码:​​https://gitee.com/fanjiangfeng/write-rpc-framwork​

  • common模块

  • 创建商品实体类和查询接口
  • RPC框架

  • 创建一个注册中心(key:接口全名,value:实现类全名)
  • 创建RpcRequest,装载信息,也要序列化,也是网络传输的一员
  • 创建RpcServer,用来创建serversocket,接收client发来的内容【RpcRequest对象,从注册中心中根据key取出实现类class,然后根据参数和方法名利用反射来执行,返回执行结果】
  • client端

  • 直接调用Rpc框架的创建代理类方法,得到返回值
  • server端

  • 写一个common接口的实现类
  • 把实现类注册到注册中心上
  • 调用RpcServer开启socketserver,接收RpcRequest,根据注册中心的key,value得到实现类的class,并解析器中的参数&&执行方法&&返回

二,代码实现

1,rpc-common模块

新建Product类,记得实现序列化,因为要在网络中进行传输。

public class Product implements Serializable {
private String name;
private Integer price;
//...
}

新建查询的接口

public interface ProductService {
Product getById(Integer id);
}

2,rpc-framwork框架

首先一个注册中心,简单点,一个Map搞定

public class Registry {
public static HashMap<String,Class> map = new HashMap<String,Class>();
}

创建RpcRequest,装载信息,也要序列化,也是网络传输的一员。

public class RpcRequest implements Serializable {
private String className;
private String methodName;
private Class[] types;
private Object[] params;
//...
}

RpcServer,用来创建serversocket,接收client发来的内容(此处线程池只是用来提高效率)

public class RPCServer {
ExecutorService service = Executors.newFixedThreadPool(5);
public void provide(int port){
try {
ServerSocket serverSocket = new ServerSocket(port);
while (true){
Socket socket = serverSocket.accept();
service.execute(new ProcessHandler(socket));
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

ProcessHandler实现Runbale,重写run方法,写核心逻辑

public class ProcessHandler implements Runnable {
private Socket socket;
public ProcessHandler(Socket socket) {
this.socket = socket;
}

@Override
public void run() {
ObjectInputStream inputStream = null;
ObjectOutputStream outputStream = null;
//核心逻辑
try {
//解析消息
inputStream = new ObjectInputStream(socket.getInputStream());
RpcRequest rpcRequest = (RpcRequest) inputStream.readObject();
//反射
Class clazz = null;
//判断注册中心是否存在接口
if(Registry.map.containsKey(rpcRequest.getClassName())){
clazz = Registry.map.get(rpcRequest.getClassName());
}
Method method = clazz.getMethod(rpcRequest.getMethodName(), rpcRequest.getTypes());
Object result = method.invoke(clazz.newInstance(),rpcRequest.getParams());
//返回结果
outputStream = new ObjectOutputStream(socket.getOutputStream());
outputStream.writeObject(result);
outputStream.flush();

}catch (Exception e){

}finally {
//关闭流
try {
if(inputStream!=null)inputStream.close();
if(outputStream!=null)outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

创建RpcProxy类,用于创建接口的动态代理

public class RpcProxy<T> {
public T remoteCall(String host,int port,Class interfaces){
//动态代理
return (T)Proxy.newProxyInstance(interfaces.getClassLoader(),new Class[]{interfaces},new RemoteInvocationHandler(host,port,interfaces));
}
}

创建RemoteInvocationHandler(自定义的名称),重写invoke方法,写代理类要执行的逻辑。

public class RemoteInvocationHandler implements InvocationHandler {
private String host;
private int port;
private Class interfaces;

public RemoteInvocationHandler(String host, int port, Class interfaces) {
this.host = host;
this.port = port;
this.interfaces = interfaces;
}

@Override
public Object invoke(Object proxy, Method method, Object[] args) {
//核心逻辑

//封装消息体
RpcRequest rpcRequest = new RpcRequest();
rpcRequest.setClassName(interfaces.getName());
rpcRequest.setMethodName(method.getName());
rpcRequest.setTypes(method.getParameterTypes());
rpcRequest.setParams(args);

Object result = null;
ObjectInputStream inputStream = null;
ObjectOutputStream outputStream = null;
try {
Socket socket = new Socket(host, port);

//发送消息
outputStream = new ObjectOutputStream(socket.getOutputStream());
outputStream.writeObject(rpcRequest);
outputStream.flush();

//接收结果
inputStream = new ObjectInputStream(socket.getInputStream());
result = inputStream.readObject();

}catch (Exception e){

}finally {
//关闭流
try {
if(inputStream!=null)inputStream.close();
if(outputStream!=null)outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return result;
}
}

3,rpc-server模块

写一个ProductService接口的实现类的具体逻辑

public class ProductServiceImpl implements ProductService {

@Override
public Product getById(Integer id) {
Product product = new Product();
product.setName("感冒灵");
product.setPrice(10);
return product;
}
}

然后把接口和实现类注册到RPC的注册中心,然后通过RPC的RPCServer开启一个serversocket,监听某一个端口。

public class Server {
public static void main(String[] args) {
Registry.map.put(ProductService.class.getName(),ProductServiceImpl.class);
new RPCServer().provide(9000);
}
}

4,rpc-client模块

直接发起对rpc-server的调用

public class Client {
public static void main(String[] args) {
RpcProxy rpcProxy = new RpcProxy();
ProductService service = (ProductService) rpcProxy.remoteCall("localhost",9000,ProductService.class);
System.out.println(service.getById(10).toString());
}
}

三,执行结果

自己手动写一个RPC框架_网络传输_02