花了半天的時間寫了個簡單的rpc框架,是因為我最初看dubbo源碼的時候發現dubbo雖然看起來很龐大,但是隱隱約約總感覺,其實其絕大多數功能,都是基于可擴張性和服務治理的需要而編寫的。我看過dubbo和grpc的源碼,這兩個都是非常優秀的rpc框架,但是為了讓初學rpc的同學能夠快速抓住rpc的核心,所以寫了這篇文章,希望看過的同學,再次去看dubbo的源碼的時候,能夠抓住這個核心去看。
一:rpc協議的接口
RpcProtocol.java
public interface RpcProtocol {
void export(int port);
Object refer(Class inrerfaceClass,String host, int port);
}
這個接口類只提供兩個接口,那是因為對于一個rpc框架來說,本質上就只需要兩個接口,一個是consumer引用provider的服務,一個是provider接收到consumer的請求之后對外暴露服務。
下面是具體的實現。代碼不復雜,可以直接復制到idea,慢慢調試
二:rpc協議的具體實現
RpcCore.java
public class RpcCore implements RpcProtocol{
private Socket socket;
private ObjectOutputStream objectOutputStream;
private ObjectInputStream objectInputStream;
private ServerSocket serverSocket;
private Map<String,List<Object>> services=new ConcurrentHashMap<String, List<Object>>();
private Map<String,Map<String,Object>> interfaceAtrributes=new ConcurrentHashMap<>();
@Override
public void export(int port){
start(port);
}
@Override
public Object refer(final Class interfaceClass,String host, int port){
connect(host,port);
return Proxy.newProxyInstance(interfaceClass.getClassLoader(), new Class[]{interfaceClass},
new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
String interfaceName=interfaceClass.getName();
String fullName= (String) interfaceAtrributes.get(interfaceName).get("fullName");
return get(fullName,method,args);
}
});
}
public Object get(String interfaceFullName,Method method,Object[] parames){
Object result=null;
try {
objectOutputStream.writeUTF(interfaceFullName);
objectOutputStream.writeUTF(method.getName());
objectOutputStream.writeObject(method.getParameterTypes());
objectOutputStream.writeObject(parames);
objectOutputStream.flush();
result=objectInputStream.readObject();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} finally {
try {
if (objectOutputStream!=null) {
objectOutputStream.close();
}
if (objectInputStream!=null) {
objectInputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return result;
}
private void start(int port) {
try {
serverSocket = new ServerSocket();
serverSocket.bind(new InetSocketAddress("localhost", port));
init();
} catch (IOException e) {
e.printStackTrace();
}
while (true) {
System.out.println("server has started success port is --->"+port);
Socket socket = null;
try {
socket = serverSocket.accept();
new Thread(new Processsor(socket,services)).start();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public void init(){
RpcDemo rpcDemo=new RpcDemoImplProvider();
String group="rpcDemo";
String version="1.0.0";
String fullName=RpcDemo.class.getName()+"&"+group+"&"+version;
List<Object> rpcDemoInstances=services.get(fullName);
if (rpcDemoInstances==null){
rpcDemoInstances=new ArrayList();
rpcDemoInstances.add(rpcDemo);
}
services.put(fullName,rpcDemoInstances);
}
public void connect(String host, int port) {
try {
storeInterface();
socket = new Socket();
socket.connect(new InetSocketAddress(host, port));
objectOutputStream=new ObjectOutputStream(socket.getOutputStream());
objectInputStream=new ObjectInputStream(socket.getInputStream());
} catch (IOException e) {
e.printStackTrace();
}
}
private void storeInterface(){
String group="rpcDemo";
String version="1.0.0";
String fullName=RpcDemo.class.getName()+"&"+group+"&"+version;
Map<String,Object> attributes=interfaceAtrributes.get(fullName);
if (attributes==null){
attributes=new ConcurrentHashMap(100);
attributes.put("group",group);
attributes.put("version",version);
attributes.put("fullName",fullName);
}
interfaceAtrributes.put(RpcDemo.class.getName(),attributes);
}
class Processsor implements Runnable {
private Socket socket;
private ObjectInputStream objectInputStream;
private ObjectOutputStream objectOutputStream;
private Map<String,List<Object>> services;
private Processsor(Socket socket,Map<String,List<Object>> services) {
this.socket = socket;
this.services=services;
}
@Override
public void run() {
System.out.println((((InetSocketAddress) socket.getRemoteSocketAddress()).getPort()));
try {
objectInputStream = new ObjectInputStream(socket.getInputStream());
objectOutputStream = new ObjectOutputStream(socket.getOutputStream());
String interfaceFullName=objectInputStream.readUTF();
String methodName=objectInputStream.readUTF();
Class[] parameTypes= (Class[]) objectInputStream.readObject();
Object[] objects= (Object[]) objectInputStream.readObject();
String interfaceName=interfaceFullName.split("&")[0];
Class service=Class.forName(interfaceName);
Method method=service.getMethod(methodName,parameTypes);
Object instances=services.get(interfaceFullName).get(0);
Object result = method.invoke(instances, objects);
objectOutputStream.writeObject(result);
objectOutputStream.flush();
objectOutputStream.close();
objectInputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
三:rpc測試的接口
所謂接口說白了就是協議,與http,mqtt等其他的協議本質上沒什么區別,只不過rpc是強依賴,而后兩個是弱依賴而已,另外之所以把實體作為內部類,是為了表達一種思想,rpc的實體類和異常都是協議的一部分,應該將他們放到一起。
Rpcdemo.java
public interface RpcDemo {
Student getStudent(Integer id,String name);
class Student implements Serializable{
public long id;
public String name;
public int age;
public boolean man;
public Student(long id, String name, int age, boolean man) {
this.id = id;
this.name = name;
this.age = age;
this.man = man;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public boolean isMan() {
return man;
}
public void setMan(boolean man) {
this.man = man;
}
@Override
public String toString() {
return "Student{" +
"id=" + id +
", name='" + name + '\'' +
", age=" + age +
", man=" + man +
'}';
}
}
}
四:接口的實現:
RpcDemoImplProvider.java
public class RpcDemoImplProvider implements RpcDemo{
public Student getStudent(Integer id,String name){
return new Student(1234,"zhangsan",20,true);
}
public static void main(String[] args) {
RpcCore rpcCore=new RpcCore();
rpcCore.export(8087);
}
}
五:RpcDemoConsumer.java
消費端。
public class RpcDemoConsumer {
public static void main(String[] args) {
RpcCore rpcCore=new RpcCore();
RpcDemo rpcDemo = (RpcDemo)rpcCore.refer(RpcDemo.class, "127.0.0.1", 8087);
System.out.println(" 遠程調用成功");
System.out.println("返回的結果是---->"+rpcDemo.getStudent(111,"zhangsan"));
}
}
六:先啟動RpcDemoImplProvider
七:啟動RpcDemoConsumer
總共也就250行代碼左右。over
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名稱欄目:三百行代碼完成一個簡單的rpc框架-創新互聯
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