网络编程 -- RPC实现原理 -- 目录

　　啦啦啦

V3——RPC -- 远程方法调用 及 null的传输 + Spring

　　服务提供商：

　　　　1. 配置 rpc03_server.xml 注入 服务提供商 rpcServiceProvider并指定初始化方法 及 服务实例 IUserService

　　　　2. 读取 服务消费者 请求的 MethodStaics ，通过反射获取服务端实例方法的返回值。返回值为null值，则映射为NullWritable实例返回。不为null，则不加以约束。

　　服务代理商：

　　　　1. 配置 rpc03_client.xml 注入 服务代理商 RPCObjectProxy并指定 目标对象 RPCClient 及 代理的接口 lime.pri.limeNio.netty.rpc03.service.IUserService

　　　　2. List<User> users = userService.queryAll(10, 4); ： 调用 目标对象的  Object invokeMethod(MethodStaics methodStaics);  方法，通过TCP/IP将MethodStaics实例发送至服务提供商。

　　　　3. 读取 服务提供商返回值。返回值为NullWritable实例，则映射为null值。其他实例，则不加以约束。

服务提供商：

　　XML ： rpc03_server.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop"

    xmlns:p="http://www.springframework.org/schema/p"

    xsi:schemaLocation="

          http://www.springframework.org/schema/beans

          classpath:/org/springframework/beans/factory/xml/spring-beans-4.1.xsd

          http://www.springframework.org/schema/context

          classpath:/org/springframework/context/config/spring-context-4.1.xsd

          http://mybatis.org/schema/mybatis-spring

          http://mybatis.org/schema/mybatis-spring.xsd

          http://www.springframework.org/schema/aop

          classpath:org/springframework/aop/config/spring-aop-4.1.xsd"

    default-lazy-init="false">

    <bean id="rpcServiceProvider" class="lime.pri.limeNio.netty.rpc03.core.server.RPCServiceProvider"

        init-method="start" destroy-method="close">

        <constructor-arg index="0" value="9999" />

    </bean>

    <bean id="IUserService" class="lime.pri.limeNio.netty.rpc03.service.impl.UserService" />

</beans>

　　Class ： RPCServiceProvider 实现ApplicationContextAware 获取通过容器的getBean()方法获取 服务实例

package lime.pri.limeNio.netty.rpc03.core.server;

import java.lang.reflect.Method;

import java.util.List;

import org.springframework.beans.BeansException;

import org.springframework.context.ApplicationContext;

import org.springframework.context.ApplicationContextAware;

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.serializer.SerializerFeature;

import io.netty.bootstrap.ServerBootstrap;

import io.netty.buffer.ByteBuf;

import io.netty.buffer.Unpooled;

import io.netty.channel.ChannelFuture;

import io.netty.channel.ChannelFutureListener;

import io.netty.channel.ChannelHandlerAdapter;

import io.netty.channel.ChannelHandlerContext;

import io.netty.channel.ChannelInitializer;

import io.netty.channel.ChannelPipeline;

import io.netty.channel.EventLoopGroup;

import io.netty.channel.nio.NioEventLoopGroup;

import io.netty.channel.socket.SocketChannel;

import io.netty.channel.socket.nio.NioServerSocketChannel;

import io.netty.handler.codec.LengthFieldBasedFrameDecoder;

import io.netty.handler.codec.LengthFieldPrepender;

import io.netty.handler.codec.MessageToMessageCodec;

import io.netty.util.CharsetUtil;

import lime.pri.limeNio.netty.rpc03.core.assist.MethodStaics;

import lime.pri.limeNio.netty.rpc03.core.assist.NullWritable;

public class RPCServiceProvider implements ApplicationContextAware {

    private ServerBootstrap serverBootstrap;

    private EventLoopGroup boss;

    private EventLoopGroup worker;

    private int port;

    private ApplicationContext act;

    public RPCServiceProvider() {

        super();

    }

    public RPCServiceProvider(int port) {

        this.serverBootstrap = new ServerBootstrap();

        this.boss = new NioEventLoopGroup();

        this.worker = new NioEventLoopGroup();

        this.serverBootstrap.group(boss, worker);

        this.serverBootstrap.channel(NioServerSocketChannel.class);

        this.port = port;

    }

    public void start() {

        serverBootstrap.childHandler(new ChannelInitializer<SocketChannel>() {

            @Override

            protected void initChannel(SocketChannel ch) throws Exception {

                ChannelPipeline pipeline = ch.pipeline();

                pipeline.addLast(new LengthFieldPrepender(2))

                        .addLast(new LengthFieldBasedFrameDecoder(65535, 0, 2, 0, 2))

                        .addLast(new MessageToMessageCodec<ByteBuf, Object>() {

                            @Override

                            protected void encode(ChannelHandlerContext ctx, Object msg, List<Object> out)

                                    throws Exception {

                                out.add(Unpooled.buffer()

                                        .writeBytes(JSON.toJSONString(msg, SerializerFeature.WriteClassName)

                                                .getBytes(CharsetUtil.UTF_8)));

                            }

                            @Override

                            protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out)

                                    throws Exception {

                                out.add(JSON.parse(msg.toString(CharsetUtil.UTF_8)));

                            }

                        }).addLast(new ChannelHandlerAdapter() {

                            @Override

                            public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {

                                MethodStaics methodStaics = (MethodStaics) msg;

                                Object bean = act.getBean(methodStaics.getTargetInterface().getSimpleName());

                                Method method = bean.getClass().getDeclaredMethod(methodStaics.getMethod(),

                                        methodStaics.getParameterTypes());

                                Object invoke = method.invoke(bean, methodStaics.getArgs());

                                // 如果返回值为空，则返回NullWritable实例代替传输

                                invoke = null == invoke ? new NullWritable() : invoke;

                                ChannelFuture channelFuture = ctx.writeAndFlush(invoke);

                                channelFuture.addListener(ChannelFutureListener.FIRE_EXCEPTION_ON_FAILURE);

                                channelFuture.addListener(ChannelFutureListener.CLOSE_ON_FAILURE);

                                channelFuture.addListener(ChannelFutureListener.CLOSE);

                            }

                            @Override

                            public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {

                                System.err.println(cause);

                            }

                        });

            }

        });

        /**

         * 绑定监听端口并启动服务 注意 ： 启动的服务是阻塞的，防止阻塞Spring工厂需要采用异步启动

         */

        new Thread() {

            public void run() {

                try {

                    System.out.println("服务启动@" + port + " ...");

                    ChannelFuture channelFuture = serverBootstrap.bind(port).sync();

                    channelFuture.channel().closeFuture().sync();

                } catch (InterruptedException e) {

                    System.out.println(e);

                } finally {

                }

            };

        }.start();

    }

    public void close() {

        boss.shutdownGracefully();

        worker.shutdownGracefully();

    }

    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {

        this.act = applicationContext;

    }

}

　　Class ： IUserService

package lime.pri.limeNio.netty.rpc03.service;

import java.util.List;

import lime.pri.limeNio.netty.rpc03.entity.User;

public interface IUserService {

    User queryById(Integer id);

    List<User> queryByName(String name);

    List<User> queryAll(Integer pageSize, Integer pageNum);

}

　　Class ： UserService

package lime.pri.limeNio.netty.rpc03.service.impl;

import java.util.ArrayList;

import java.util.Date;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.concurrent.ConcurrentHashMap;

import lime.pri.limeNio.netty.rpc03.entity.User;

import lime.pri.limeNio.netty.rpc03.service.IUserService;

public class UserService implements IUserService {

    private static Map<Integer, User> userMap = new ConcurrentHashMap<Integer, User>();

    static {

        for (int i = 1; i <= 100; i++) {

            userMap.put(i, new User(i, "lime_" + i, new Date()));

        }

    }

    public User queryById(Integer id) {

        return userMap.get(id);

    }

    public List<User> queryAll(Integer pageSize, Integer pageNum) {

        int stNum = (pageNum - 1) * pageSize + 1;

        int enNum = pageNum * pageSize;

        List<User> result = new ArrayList<User>();

        for (int i = stNum; i <= enNum; i++) {

            result.add(userMap.get(i));

        }

        return result;

    }

    public List<User> queryByName(String name) {

        List<User> result = null;

        Iterator<User> iterator = userMap.values().iterator();

        while (iterator.hasNext()) {

            User user = iterator.next();

            if (user.getName().equals(name)) {

                if (null == result)

                    result = new ArrayList<User>();

                result.add(user);

            }

        }

        return result;

    }

}

服务代理商：

　　Class ：

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop"

    xmlns:p="http://www.springframework.org/schema/p"

    xsi:schemaLocation="

          http://www.springframework.org/schema/beans

          classpath:/org/springframework/beans/factory/xml/spring-beans-4.1.xsd

          http://www.springframework.org/schema/context

          classpath:/org/springframework/context/config/spring-context-4.1.xsd

          http://mybatis.org/schema/mybatis-spring

          http://mybatis.org/schema/mybatis-spring.xsd

          http://www.springframework.org/schema/aop

          classpath:org/springframework/aop/config/spring-aop-4.1.xsd"

    default-lazy-init="false">

    <bean id="userService" class="lime.pri.limeNio.netty.rpc03.core.client.proxy.RPCObjectProxy">

        <constructor-arg index="0" ref="rpcClient" />

        <constructor-arg index="1" value="lime.pri.limeNio.netty.rpc03.service.IUserService" />

    </bean>

    <bean id="rpcClient" class="lime.pri.limeNio.netty.rpc03.core.client.impl.RemoteRPCClient"

        destroy-method="close">

        <constructor-arg index="0" ref="hostAndPort" />

    </bean>

    <bean id="hostAndPort" class="lime.pri.limeNio.netty.rpc03.core.client.assist.HostAndPort">

        <constructor-arg index="0" value="127.0.0.1" />

        <constructor-arg index="1" value="9999" />

    </bean>

</beans>

　　Class ： RPCObjectProxy

package lime.pri.limeNio.netty.rpc03.core.client.proxy;

import java.lang.reflect.InvocationHandler;

import java.lang.reflect.Method;

import java.lang.reflect.Proxy;

import org.springframework.beans.factory.FactoryBean;

import lime.pri.limeNio.netty.rpc03.core.assist.MethodStaics;

import lime.pri.limeNio.netty.rpc03.core.client.rpcClient.RPCClient;

/**

 * 通过接口动态创建代理对象

 *

 * @author lime

 * @param <T>

 *

 *            实现FactoryBean接口，与Spring整合

 *

 */

public class RPCObjectProxy implements InvocationHandler, FactoryBean<Object> {

    private RPCClient rpcClient;

    private Class<?> targetInterface;

    public RPCObjectProxy() {

        super();

    }

    public RPCObjectProxy(RPCClient rpcClient, Class<?> targetInterface) {

        super();

        this.rpcClient = rpcClient;

        this.targetInterface = targetInterface;

    }

    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

        return rpcClient

                .invokeMethod(new MethodStaics(targetInterface, method.getName(), args, method.getParameterTypes()));

    }

    // 产生代理对象

    public Object getObject() throws Exception {

        return Proxy.newProxyInstance(RPCObjectProxy.class.getClassLoader(), new Class[] { targetInterface }, this);

    }

    public Class<?> getObjectType() {

        return targetInterface;

    }

    public boolean isSingleton() {

        return true;

    }

}

　　Class ： RPCClient

package lime.pri.limeNio.netty.rpc03.core.client.rpcClient;

import lime.pri.limeNio.netty.rpc03.core.assist.MethodStaics;

/**

 * 通过RPCClient实现对远程方法的调用

 *

 * @author lime

 *

 */

public interface RPCClient {

    Object invokeMethod(MethodStaics methodStaics);

    void close();

}

　　Class ： RemoteRPCClient

package lime.pri.limeNio.netty.rpc03.core.client.rpcClient.impl;

import java.net.InetSocketAddress;

import java.util.List;

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.serializer.SerializerFeature;

import io.netty.bootstrap.Bootstrap;

import io.netty.buffer.ByteBuf;

import io.netty.buffer.Unpooled;

import io.netty.channel.ChannelFuture;

import io.netty.channel.ChannelFutureListener;

import io.netty.channel.ChannelHandlerAdapter;

import io.netty.channel.ChannelHandlerContext;

import io.netty.channel.ChannelInitializer;

import io.netty.channel.ChannelPipeline;

import io.netty.channel.EventLoopGroup;

import io.netty.channel.nio.NioEventLoopGroup;

import io.netty.channel.socket.SocketChannel;

import io.netty.channel.socket.nio.NioSocketChannel;

import io.netty.handler.codec.LengthFieldBasedFrameDecoder;

import io.netty.handler.codec.LengthFieldPrepender;

import io.netty.handler.codec.MessageToMessageCodec;

import io.netty.util.CharsetUtil;

import lime.pri.limeNio.netty.rpc03.core.assist.MethodStaics;

import lime.pri.limeNio.netty.rpc03.core.assist.NullWritable;

import lime.pri.limeNio.netty.rpc03.core.client.assist.HostAndPort;

import lime.pri.limeNio.netty.rpc03.core.client.rpcClient.RPCClient;

/**

 * 通过TCP/IP协议实现远程方法调用

 *

 * @author lime

 *

 */

public class RemoteRPCClient implements RPCClient {

    private Bootstrap bootstrap;

    private EventLoopGroup worker;

    private HostAndPort hostAndPort;

    public RemoteRPCClient() {

        super();

    }

    public RemoteRPCClient(HostAndPort hostAndPost) {

        this.hostAndPort = hostAndPost;

        // 初始化数据

        this.bootstrap = new Bootstrap();

        this.worker = new NioEventLoopGroup();

        this.bootstrap.group(this.worker);

        this.bootstrap.channel(NioSocketChannel.class);

    }

    public Object invokeMethod(final MethodStaics methodStaics) {

        bootstrap.handler(new ChannelInitializer<SocketChannel>() {

            @Override

            protected void initChannel(SocketChannel ch) throws Exception {

                ChannelPipeline pipeline = ch.pipeline();

                pipeline.addLast(new LengthFieldBasedFrameDecoder(65535, 0, 2, 0, 2))

                        .addLast(new LengthFieldPrepender(2)).addLast(new MessageToMessageCodec<ByteBuf, Object>() {

                            @Override

                            protected void encode(ChannelHandlerContext ctx, Object msg, List<Object> out)

                                    throws Exception {

                                out.add(Unpooled.buffer()

                                        .writeBytes(JSON.toJSONString(msg, SerializerFeature.WriteClassName)

                                                .getBytes(CharsetUtil.UTF_8)));

                            }

                            @Override

                            protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out)

                                    throws Exception {

                                out.add(JSON.parse(msg.toString(CharsetUtil.UTF_8)));

                            }

                        }).addLast(new ChannelHandlerAdapter() {

                            @Override

                            public void channelActive(ChannelHandlerContext ctx) throws Exception {

                                ChannelFuture channelFuture = ctx.writeAndFlush(methodStaics);

                                channelFuture.addListener(ChannelFutureListener.FIRE_EXCEPTION_ON_FAILURE);

                                channelFuture.addListener(ChannelFutureListener.CLOSE_ON_FAILURE);

                            }

                            @Override

                            public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {

                                methodStaics.setResult(msg);

                            }

                            @Override

                            public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {

                                System.err.println(cause);

                            }

                        });

            }

        });

        ChannelFuture channelFuture;

        try {

            channelFuture = bootstrap.connect(new InetSocketAddress(hostAndPort.getHost(), hostAndPort.getPort()))

                    .sync();

            channelFuture.channel().closeFuture().sync();

        } catch (InterruptedException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        // 服务端返回值为null，处理方式

        return methodStaics.getResult() instanceof NullWritable ? null : methodStaics.getResult();

    }

    public void close() {

        worker.shutdownGracefully();

    }

}

　　Class ： HostAndPort

package lime.pri.limeNio.netty.rpc03.core.client.assist;

import java.io.Serializable;

public class HostAndPort implements Serializable{

    /**

     *

     */

    private static final long serialVersionUID = 1L;

    private String host;

    private int port;

    public HostAndPort() {

        super();

        // TODO Auto-generated constructor stub

    }

    public HostAndPort(String host, int port) {

        super();

        this.host = host;

        this.port = port;

    }

    public String getHost() {

        return host;

    }

    public void setHost(String host) {

        this.host = host;

    }

    public int getPort() {

        return port;

    }

    public void setPort(int port) {

        this.port = port;

    }

    @Override

    public String toString() {

        return "HostAndPort [host=" + host + ", port=" + port + "]";

    }

}

辅助类：

　　Class ： MethodStaics

package lime.pri.limeNio.netty.rpc03.core.assist;

import java.io.Serializable;

import java.util.Arrays;

/**

 * @author lime

 *

 */

public class MethodStaics implements Serializable{

    /**

     *

     */

    private static final long serialVersionUID = 1L;

    private Class<?> targetInterface;

    private String method;

    private Object[] args;

    private Class[] parameterTypes;

    private Object result;

    public MethodStaics() {

        super();

        // TODO Auto-generated constructor stub

    }

    public MethodStaics(Class<?> targetInterface, String method, Object[] args, Class[] parameterTypes) {

        super();

        this.targetInterface = targetInterface;

        this.method = method;

        this.args = args;

        this.parameterTypes = parameterTypes;

    }

    @Override

    public String toString() {

        return "MethodStaics [targetInterface=" + targetInterface + ", method=" + method + ", args="

                + Arrays.toString(args) + ", parameterTypes=" + Arrays.toString(parameterTypes) + "]";

    }

    public Class<?> getTargetInterface() {

        return targetInterface;

    }

    public void setTargetInterface(Class<?> targetInterface) {

        this.targetInterface = targetInterface;

    }

    public String getMethod() {

        return method;

    }

    public void setMethod(String method) {

        this.method = method;

    }

    public Object[] getArgs() {

        return args;

    }

    public void setArgs(Object[] args) {

        this.args = args;

    }

    public Class[] getParameterTypes() {

        return parameterTypes;

    }

    public void setParameterTypes(Class[] parameterTypes) {

        this.parameterTypes = parameterTypes;

    }

    public Object getResult() {

        return result;

    }

    public void setResult(Object result) {

        this.result = result;

    }

}

　　Class ： NullWritable

package lime.pri.limeNio.netty.rpc03.core.assist;

import java.io.Serializable;

public class NullWritable implements Serializable{

    /**

     *

     */

    private static final long serialVersionUID = 1L;

}

　　Class ： User

package lime.pri.limeNio.netty.rpc03.entity;

import java.io.Serializable;

import java.util.Date;

public class User implements Serializable {

    /**

     *

     */

    private static final long serialVersionUID = 1L;

    private int id;

    private String name;

    private Date birth;

    public User() {

        super();

        // TODO Auto-generated constructor stub

    }

    public User(int id, String name, Date birth) {

        super();

        this.id = id;

        this.name = name;

        this.birth = birth;

    }

    @Override

    public String toString() {

        return "User [id=" + id + ", name=" + name + ", birth=" + birth + "]";

    }

    public int getId() {

        return id;

    }

    public void setId(int id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public Date getBirth() {

        return birth;

    }

    public void setBirth(Date birth) {

        this.birth = birth;

    }

}

测试类：

　　Class ： TtServer

package lime.pri.limeNio.netty.rpc03.tT;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TtServer {

    public static void main(String[] args) throws Exception {

        new ClassPathXmlApplicationContext("classpath:spring/rpc03_server.xml");

    }

}

　　Class ： TtClient

package lime.pri.limeNio.netty.rpc03.tT;

import java.util.List;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import lime.pri.limeNio.netty.rpc03.entity.User;

import lime.pri.limeNio.netty.rpc03.service.IUserService;

public class TtClient {

    public static void main(String[] args) throws Exception {

        ApplicationContext ctx = new ClassPathXmlApplicationContext("classpath:spring/rpc03_client.xml");

        IUserService userService = (IUserService) ctx.getBean("userService");

        System.out.println("queryByName");

        List<User> usersWithName = userService.queryByName("lime");

        System.out.println(usersWithName);

        System.out.println("queryAll");

        List<User> users = userService.queryAll(10, 3);

        for (User user : users) {

            System.out.println(user);

        }

        System.out.println("queryById");

        User user = userService.queryById(23);

        System.out.println(user);

    }

}

　　Console ： Server

六月 25, 2017 2:08:04 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh

信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@17f052a3: startup date [Sun Jun 25 14:08:04 CST 2017]; root of context hierarchy

六月 25, 2017 2:08:04 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

信息: Loading XML bean definitions from class path resource [spring/rpc03_server.xml]

服务启动@9999 ...

　　Console ： Client

六月 25, 2017 2:08:18 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh

信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@17f052a3: startup date [Sun Jun 25 14:08:18 CST 2017]; root of context hierarchy

六月 25, 2017 2:08:18 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

信息: Loading XML bean definitions from class path resource [spring/rpc03_client.xml]

queryByName

null

queryAll

User [id=21, name=lime_21, birth=Sun Jun 25 14:08:04 CST 2017]

User [id=22, name=lime_22, birth=Sun Jun 25 14:08:04 CST 2017]

User [id=23, name=lime_23, birth=Sun Jun 25 14:08:04 CST 2017]

User [id=24, name=lime_24, birth=Sun Jun 25 14:08:04 CST 2017]

User [id=25, name=lime_25, birth=Sun Jun 25 14:08:04 CST 2017]

User [id=26, name=lime_26, birth=Sun Jun 25 14:08:04 CST 2017]

User [id=27, name=lime_27, birth=Sun Jun 25 14:08:04 CST 2017]

User [id=28, name=lime_28, birth=Sun Jun 25 14:08:04 CST 2017]

User [id=29, name=lime_29, birth=Sun Jun 25 14:08:04 CST 2017]

User [id=30, name=lime_30, birth=Sun Jun 25 14:08:04 CST 2017]

queryById

User [id=23, name=lime_23, birth=Sun Jun 25 14:08:04 CST 2017]

啦啦啦

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