hadoop RPC协议之WritableRpcEngine

本文介绍了一个基于Hadoop的RPC(远程过程调用)实现案例,包括服务端(RpcServer)和客户端(RpcClient)的具体代码。通过定义接口`ClientProtocol`,并在服务端实现了该接口的方法,客户端通过RPC调用服务端提供的方法完成加法运算。

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接口类ClientProtocol

package rpcTest;

import java.io.IOException;

interface ClientProtocol extends org.apache.hadoop.ipc.VersionedProtocol{
    public static final long versionID = 1L;
    String echo(String value) throws IOException;
    int add(int v1, int v2) throws IOException;
   
}

RpcClient

package rpcTest;

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

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

public class RpcClient {
    public static void main(String[] args) throws IOException {
        Configuration conf = new Configuration();
        String ADDRESS = "localhost";
        int port = 9998;
        ClientProtocol proxy = (ClientProtocol) RPC.getProxy(ClientProtocol.class,
                ClientProtocol.versionID,
                new InetSocketAddress(ADDRESS,port),
                conf);
        int result = proxy.add(5, 6);
        System.out.println(result);
    }
}

RpcServer类

package rpcTest;

import java.io.IOException;

import org.apache.hadoop.HadoopIllegalArgumentException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.ipc.ProtocolSignature;
import org.apache.hadoop.ipc.RPC;
import org.mortbay.jetty.Server;

public class RpcServer {
    public static class ClientProtocolImpl implements ClientProtocol{

        @Override
        public long getProtocolVersion(String protocol, long clientVersion)
                throws IOException {
            // TODO Auto-generated method stub
            return ClientProtocol.versionID;
        }

        @Override
        public ProtocolSignature getProtocolSignature(String protocol,
                long clientVersion, int clientMethodsHash) throws IOException {
            // TODO Auto-generated method stub
            return new ProtocolSignature(ClientProtocol.versionID,null);
        }

        @Override
        public String echo(String value) throws IOException {
            // TODO Auto-generated method stub
            return value;
        }

        @Override
        public int add(int v1, int v2) throws IOException {
            // TODO Auto-generated method stub
            return v1+ v2;
        }
        
    }
    public static void main(String[] args) {

        Configuration conf = new Configuration();
        String ADDRESS = "localhost";
        int port = 9998;
        RPC.Server server;
        try {
            server = new RPC.Builder(conf).setProtocol(ClientProtocol.class)
                    .setInstance(new ClientProtocolImpl())
                    .setBindAddress(ADDRESS)
                    .setPort(port)
                    .setNumHandlers(1).build();
            server.start();
        } catch (HadoopIllegalArgumentException | IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }       
    }
}


执行过程:

1。先执行RpcServer类,监听相关端口。

2。再执行RpcClient,执行客户端程序。

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