RPC简单实例_rpc实例

什么是RPC？

远程过程调用（Remote Procedure Call，RPC）是一个计算机通信协议。该协议允许运行于一台计算机的程序调用另一台计算机的子程序，同时将网络的通信细节隐藏起来，而程序员无需额外的为这个交互作用编程。RPC采用客户机/服务器模型。
请求过程如图：

客户端程序->客户端Stub程序 ->通信模块 -> 远程请求 -> 通信模块 -> 调度程序 -> 服务器端Stub程序 -> 服务程序
**

实例代码：

**

package org.example.RpcTest;

import org.apache.hadoop.ipc.VersionedProtocol;

import java.io.IOException;

public interface MethodProtocol extends VersionedProtocol {
    public static final  long versionID=1L;
    int calculate(int v1,int v2) throws IOException;
}

package org.example.RpcTest;

import org.apache.hadoop.ipc.ProtocolSignature;

import java.io.IOException;

public class MethodProtocolImpl implements MethodProtocol {

    public long getProtocolVersion(String protocol,long clientVersion){
        return MethodProtocol.versionID;
    }

    public ProtocolSignature getProtocolSignature(String protocol, long clientVersion, int hashcode){
        return new ProtocolSignature(MethodProtocol.versionID,null);
    }
    @Override
    public int calculate(int v1, int v2) throws IOException {
        return ((v1+v2)/2);
    }
}

package org.example.RpcTest;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.ipc.RPC;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.Arrays;

public class RpcClient {
    public static void main(String[] args) throws IOException {
        MethodProtocol proxy;
        InetSocketAddress addr = new InetSocketAddress("localhost",8866);
        Configuration conf = new Configuration();
        proxy = (MethodProtocol) RPC.getProxy(MethodProtocol.class,MethodProtocol.versionID,addr,conf);
        int result = proxy.calculate(7,7);
        System.out.println(result);
    }
}


package org.example.RpcTest;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.ipc.RPC;
import org.apache.hadoop.ipc.Server;

import java.io.IOException;
import java.util.Arrays;

public class RpcServer {
    public static void main(String[] args) {
        Configuration conf = new Configuration();
        Server server = null;
        try {
            server = new RPC.Builder(conf).setProtocol(MethodProtocol.class).setInstance(new MethodProtocolImpl()).setBindAddress("localhost")
                    .setPort(8866).setNumHandlers(5).build();
        } catch (IOException e) {
            e.printStackTrace();
        }
        server.start();
        System.out.println("server begin .....");
    }
}
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