RpcServer.java

package me.anduo.rpc.server.core;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
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 java.util.HashMap;
import java.util.Map;

import org.apache.commons.collections4.MapUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

import me.anduo.rpc.client.RpcRequest;
import me.anduo.rpc.client.RpcResponse;
import me.anduo.rpc.common.RpcDecoder;

/**
 * RPC服务实例。
 *
 * @author duoan
 */
public class RpcServer implements ApplicationContextAware, InitializingBean {

    private static final Logger LOGGER = LoggerFactory.getLogger(RpcServer.class);


    private String serverAddress;
    private ServiceRegistry serviceRegistry;

    /**
     * 存放接口名与服务对象之间的映射关系
     */
    private Map<String, Object> handlerMap = new HashMap<>();

    public RpcServer(String serverAddress) {
        this.serverAddress = serverAddress;
    }

    public RpcServer(String serverAddress, ServiceRegistry serviceRegistry) {
        this.serverAddress = serverAddress;
        this.serviceRegistry = serviceRegistry;
    }

    @Override
    public void setApplicationContext(ApplicationContext ctx) throws BeansException {
        // 获取所有带有RpcService注解的SpringBean
        Map<String, Object> serviceBeanMap = ctx.getBeansWithAnnotation(RpcService.class);
        if (MapUtils.isNotEmpty(serviceBeanMap)) {
            for (Object serviceBean : serviceBeanMap.values()) {
                String interfaceName = serviceBean.getClass().getAnnotation(RpcService.class).value().getName();
                handlerMap.put(interfaceName, serviceBean);
            }
        }
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap bootstrap = new ServerBootstrap();
            bootstrap.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        public void initChannel(SocketChannel channel) {
                            channel.pipeline().addLast(
                                    /** 将RPC请求进行解码（为了处理请求）*/
                                    new RpcDecoder(RpcRequest.class))
                                    /** 将RPC响应进行编码（为了返回响应）*/
                                    .addLast(new RpcDecoder(RpcResponse.class))
                                    /** 处理RPC请求*/
                                    .addLast(new RpcHandler(handlerMap));
                        }
                    }).option(ChannelOption.SO_BACKLOG, 128).childOption(ChannelOption.SO_KEEPALIVE, true);

            String[] array = serverAddress.split(":");
            String host = array[0];
            int port = Integer.parseInt(array[1]);

            ChannelFuture future = bootstrap.bind(host, port).sync();
            LOGGER.debug("server started on port {}", port);

            if (serviceRegistry != null) {
                serviceRegistry.register(serverAddress); // 注册服务地址
            }

            future.channel().closeFuture().sync();
        } finally {
            workerGroup.shutdownGracefully();
            bossGroup.shutdownGracefully();
        }
    }

}