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三百行代码完成一个简单的rpc框架
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<p>花了半天的时间写了个简单的rpc框架，是因为我最初看dubbo源码的时候发现dubbo虽然看起来很庞大，但是隐隐约约总感觉，其实其绝大多数功能，都是基于可扩张性和服务治理的需要而编写的。我看过dubbo和grpc的源码，这两个都是非常优秀的rpc框架，但是为了让初学rpc的同学能够快速抓住rpc的核心，所以写了这篇文章，希望看过的同学，再次去看dubbo的源码的时候，能够抓住这个核心去看。</p>
<p>一：rpc协议的接口</p>
<p>RpcProtocol.java</p>
<p>public interface RpcProtocol {<br> void export(int port);<br> Object refer(Class inrerfaceClass,String host, int port);<br>}</p>
<p>这个接口类只提供两个接口，那是因为对于一个rpc框架来说，本质上就只需要两个接口，一个是consumer引用provider的服务，一个是provider接收到consumer的请求之后对外暴露服务。<br>下面是具体的实现。代码不复杂，可以直接复制到idea，慢慢调试</p>
<p>二：rpc协议的具体实现</p>
<p>RpcCore.java</p>
<p>public class RpcCore implements RpcProtocol{</p>
<p>private Socket socket;<br>private ObjectOutputStream objectOutputStream;<br>private ObjectInputStream objectInputStream;</p>
<p>private ServerSocket serverSocket;<br>private Map<String,List<object>> services=new ConcurrentHashMap<String, List<object>>();<br>private Map<String,Map<String,Object>> interfaceAtrributes=new ConcurrentHashMap<>();</object></object></p>
<p>@Override<br>public void export(int port){<br> start(port);<br>}</p>
<p>@Override<br>public Object refer(final Class interfaceClass,String host, int port){<br> connect(host,port);<br> return Proxy.newProxyInstance(interfaceClass.getClassLoader(), new Class[]{interfaceClass},<br> new InvocationHandler() {<br> @Override<br> public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {<br> String interfaceName=interfaceClass.getName();<br> String fullName= (String) interfaceAtrributes.get(interfaceName).get(“fullName”);<br> return get(fullName,method,args);<br> }<br> });<br>}</p>
<p>public Object get(String interfaceFullName,Method method,Object[] parames){<br> Object result=null;<br> try {<br> objectOutputStream.writeUTF(interfaceFullName);<br> objectOutputStream.writeUTF(method.getName());<br> objectOutputStream.writeObject(method.getParameterTypes());<br> objectOutputStream.writeObject(parames);<br> objectOutputStream.flush();<br> result=objectInputStream.readObject();<br> } catch (IOException e) {<br> e.printStackTrace();<br> } catch (ClassNotFoundException e) {<br> e.printStackTrace();<br> } finally {<br> try {<br> if (objectOutputStream!=null) {<br> objectOutputStream.close();<br> }<br> if (objectInputStream!=null) {<br> objectInputStream.close();<br> }<br> } catch (IOException e) {<br> e.printStackTrace();<br> }<br> }<br> return result;</p>
<p>}</p>
<p>private void start(int port) {<br> try {<br> serverSocket = new ServerSocket();<br> serverSocket.bind(new InetSocketAddress(“localhost”, port));<br> init();<br> } catch (IOException e) {<br> e.printStackTrace();<br> }<br> while (true) {<br> System.out.println(“server has started success port is —>”+port);<br> Socket socket = null;<br> try {<br> socket = serverSocket.accept();<br> new Thread(new Processsor(socket,services)).start();<br> } catch (IOException e) {<br> e.printStackTrace();<br> }</p>
<pre><code>}
</code></pre><p>}</p>
<p>public void init(){<br> RpcDemo rpcDemo=new RpcDemoImplProvider();<br> String group=”rpcDemo”;<br> String version=”1.0.0”;<br> String fullName=RpcDemo.class.getName()+”&”+group+”&”+version;<br> List<object> rpcDemoInstances=services.get(fullName);<br> if (rpcDemoInstances==null){<br> rpcDemoInstances=new ArrayList();<br> rpcDemoInstances.add(rpcDemo);<br> }<br> services.put(fullName,rpcDemoInstances);<br>}</object></p>
<p>public void connect(String host, int port) {<br> try {<br> storeInterface();<br> socket = new Socket();<br> socket.connect(new InetSocketAddress(host, port));<br> objectOutputStream=new ObjectOutputStream(socket.getOutputStream());<br> objectInputStream=new ObjectInputStream(socket.getInputStream());<br> } catch (IOException e) {<br> e.printStackTrace();<br> }</p>
<p>}</p>
<p>private void storeInterface(){<br> String group=”rpcDemo”;<br> String version=”1.0.0”;<br> String fullName=RpcDemo.class.getName()+”&”+group+”&”+version;<br> Map<String,Object> attributes=interfaceAtrributes.get(fullName);<br> if (attributes==null){<br> attributes=new ConcurrentHashMap(100);<br> attributes.put(“group”,group);<br> attributes.put(“version”,version);<br> attributes.put(“fullName”,fullName);<br> }<br> interfaceAtrributes.put(RpcDemo.class.getName(),attributes);</p>
<p>}</p>
<p>class Processsor implements Runnable {<br> private Socket socket;<br> private ObjectInputStream objectInputStream;<br> private ObjectOutputStream objectOutputStream;<br> private Map<String,List<object>> services;<br> private Processsor(Socket socket,Map<String,List<object>> services) {<br> this.socket = socket;<br> this.services=services;<br> }</object></object></p>
<pre><code>@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();
}
}
</code></pre><p>}</p>
<p>}</p>
<p>三：rpc测试的接口<br>所谓接口说白了就是协议，与http，mqtt等其他的协议本质上没什么区别，只不过rpc是强依赖，而后两个是弱依赖而已，另外之所以把实体作为内部类，是为了表达一种思想，rpc的实体类和异常都是协议的一部分，应该将他们放到一起。<br>Rpcdemo.java</p>
<p>public interface RpcDemo {<br>Student getStudent(Integer id,String name);<br>class Student implements Serializable{<br> public long id;<br> public String name;<br> public int age;<br> public boolean man;</p>
<pre><code>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 +
'}';
}
</code></pre><p>}<br>}</p>
<p>四：接口的实现：</p>
<p>RpcDemoImplProvider.java</p>
<p>public class RpcDemoImplProvider implements RpcDemo{<br>public Student getStudent(Integer id,String name){<br> return new Student(1234,”zhangsan”,20,true);<br>}</p>
<p>public static void main(String[] args) {<br> RpcCore rpcCore=new RpcCore();<br> rpcCore.export(8087);<br>}<br>}</p>
<p>五：RpcDemoConsumer.java</p>
<p>消费端。</p>
<p>public class RpcDemoConsumer {<br>public static void main(String[] args) {<br> RpcCore rpcCore=new RpcCore();<br> RpcDemo rpcDemo = (RpcDemo)rpcCore.refer(RpcDemo.class, “127.0.0.1”, 8087);</p>
<pre><code>System.out.println(" 远程调用成功");
System.out.println("返回的结果是---->"+rpcDemo.getStudent(111,"zhangsan"));
</code></pre><p>}<br>}</p>
<p>六：先启动RpcDemoImplProvider<br>三百行代码完成一个简单的rpc框架</p>
<p>七：启动RpcDemoConsumer<br>三百行代码完成一个简单的rpc框架</p>
<p>总共也就250行代码左右。over</p>
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