java游戏开发入门2_基于netty+protobuf的游戏框架 -

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java游戏开发入门2_基于netty+protobuf的游戏框架

博客分类：

java
java游戏开发
netty
protoBuf

netty protobuf java 游戏后台服务器

/**
刚开始学习游戏开发时想找一个基于netty的游戏demo十分困难,工作一段时间后了解框架后将其分享出来;
该框架是从别人框架移植修改完善而来,不是我一个人写,算是借花献佛;
实际业务开发比此框架要复杂得多,去繁从简主在体现核心思想;
这是游戏开发入门的第2篇,如果有不完善的地方请多多指导.
*/

框架示意图如下,源代码参看:github:

客户端连接进来,由acceptor负责接入验证,创立channel后再转发给从线程池(workerReactor);

package com.server.java.netty;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;

public class NettyServer implements Runnable {
	private int port;

	public NettyServer(int port) {
		super();
		this.port = port;
	}

	public int getPort() {
		return port;
	}

	public void setPort(int port) {
		this.port = port;
	}

	@Override
	public void run() {
		try {// netty支持3种reactor,netty推荐主从(boss和worker)
			EventLoopGroup bossGroup = new NioEventLoopGroup(4);// acceptor,负责tcp接入,接入认证,创立socketChannel等;
			EventLoopGroup workerGroup = new NioEventLoopGroup();// netty默认设置:Runtime.getRuntime().availableProcessors()
																	// 负责io的读写和编码

			try {
				ServerBootstrap b = new ServerBootstrap();
				b.group(bossGroup, workerGroup).option(ChannelOption.TCP_NODELAY, true).option(ChannelOption.SO_KEEPALIVE, true).channel(NioServerSocketChannel.class)
						.handler(new LoggingHandler(LogLevel.INFO)).childHandler(new NettyServerInitializer());

				ChannelFuture f = b.bind(port).sync();

				// Wait until the server socket is closed.
				// In this example, this does not happen, but you can do that to
				// gracefully
				// shut down your server.
				f.channel().closeFuture().sync();
			} finally {
				workerGroup.shutdownGracefully();
				bossGroup.shutdownGracefully();
			}
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}

}

worker Reactor 按照指定协议解码,构件出msgEntity对象,触发对应事件,在根据不同命令码(cmdCode)传递给对应的保存队列(blockqueue)

package com.server.java.netty;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;

import java.nio.ByteOrder;

import com.server.java.entity.MsgEntity;

/**
 * 定长解码器
 * */
public class NettyMsgDecoder extends LengthFieldBasedFrameDecoder {

	/**
	 * @param byteOrder
	 * @param maxFrameLength
	 *            字节最大长度,大于此长度则抛出异常
	 * @param lengthFieldOffset
	 *            开始计算长度位置,这里使用0代表放置到最开始
	 * @param lengthFieldLength
	 *            描述长度所用字节数
	 * @param lengthAdjustment
	 *            长度补偿,这里由于命令码使用2个字节.需要将原来长度计算加2
	 * @param initialBytesToStrip
	 *            开始计算长度需要跳过的字节数
	 * @param failFast
	 */
	public NettyMsgDecoder(ByteOrder byteOrder, int maxFrameLength, int lengthFieldOffset, int lengthFieldLength, int lengthAdjustment, int initialBytesToStrip, boolean failFast) {
		super(byteOrder, maxFrameLength, lengthFieldOffset, lengthFieldLength, lengthAdjustment, initialBytesToStrip, failFast);
	}

	public NettyMsgDecoder() {
		this(ByteOrder.BIG_ENDIAN, 100000, 0, 4, 2, 4, true);
	}

	/**
	 * 根据构造方法自动处理粘包,半包.然后调用此decode
	 * */
	@Override
	protected Object decode(ChannelHandlerContext ctx, ByteBuf byteBuf) throws Exception {

		ByteBuf frame = (ByteBuf) super.decode(ctx, byteBuf);
		if (frame == null) {
			return null;
		}

		short cmd = frame.readShort();// 先读取两个字节命令码

		byte[] data = new byte[frame.readableBytes()];// 其它数据为实际数据
		frame.readBytes(data);

		MsgEntity msgVO = new MsgEntity();
		msgVO.setCmdCode(cmd);
		msgVO.setData(data);
		return msgVO;
	}

}

package com.server.java.netty;

import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

import com.server.java.entity.MsgEntity;
import com.server.java.queue.CommonQueue;
import com.server.java.queue.LoginQueue;

@Sharable
public class ServerHanlder extends SimpleChannelInboundHandler<MsgEntity> {

	@Override
	protected void messageReceived(ChannelHandlerContext ctx, MsgEntity msg) throws Exception {

		if (msg == null) {
			return;
		}
		msg.setChannel(ctx.channel());

		// int playerid = ServerCache.get(ctx.channel());

		int csCommondCode = msg.getCmdCode();
		if (csCommondCode < 100) {// 100以内暂时不用

		} else if (csCommondCode >= 100 && csCommondCode < 200) { // 100-200用于注册
			LoginQueue.getInstance().put(msg);

		} else {// 消息可能较多,可以分几个队列,这里先放一个
			CommonQueue.getInstance().put(msg);
		}

	}
}

每个blockQueue负责执行的线程异步取出msgEntity,通过cmdCode获得解码protobuf的GeneralMessage,解码出请求数据;

package com.server.java.handler;

import java.util.List;

import com.google.protobuf.InvalidProtocolBufferException;
import com.server.java.CmdHandler;
import com.server.java.cache.ServerCache;
import com.server.java.constants.CmdConstant;
import com.server.java.entity.MsgEntity;
import com.server.java.entity.PlayerEntity;
import com.server.proto.demo.DemoProto.NameCheckReq;
import com.server.proto.demo.DemoProto.NameCheckResp;
import com.server.proto.demo.DemoProto.SayHelloReq;
import com.server.proto.demo.DemoProto.SayHelloResp;

public class DemoHanlder extends CmdHandler {

	@Override
	public void handleMsg(MsgEntity msgEntity, List<MsgEntity> commandList) {
		switch (msgEntity.getCmdCode()) {// 根据命令码对应找到对应处理方法
		case CmdConstant.NAME_CHECK:
			handleNameCheck(msgEntity, commandList);
			break;
		case CmdConstant.SAY_HELLO:
			handleSayHello(msgEntity, commandList);
			break;
		default:
			System.out.println("找不到对应的命令码");
		}
	}

	private void handleNameCheck(MsgEntity msgEntity, List<MsgEntity> commandList) {
		// com.server.proto.demo.
		NameCheckReq req = null;
		try {// 按照与客户端约定,指定命令码使用指定的解码class解码
				// 这里可以通过反射做成自动解码,参考:http://vincepeng.iteye.com/blog/2171310
			req = NameCheckReq.parseFrom(msgEntity.getData());
		} catch (InvalidProtocolBufferException e) {
			System.out.println("protobuf解码错误");
			e.printStackTrace();
			return;
		}
		String name = req.getName();
		if (name == null || name.isEmpty()) {
			return;
		}

		boolean isExist = ServerCache.CheckName(name);
		if (!isExist) {// 如果没有存在/则模拟注册
			ServerCache.addNewPlayer(name, msgEntity.getChannel());// 由于是单线程操作,无需加锁.参考:实战1的第2条
		}
		NameCheckResp.Builder resp = NameCheckResp.newBuilder();
		resp.setIsExist(isExist);
		msgEntity.setData(resp.build().toByteArray());// 将原来的消息内容替换为回包,命令码无需变化
		commandList.add(msgEntity);// 加入到发送数组
		if (!isExist) {
			SayHelloResp helloResp = SayHelloResp.newBuilder().setContent("欢迎" + name + "的到来").setSpeaker("系统").build();
			MsgEntity helloMsg = new MsgEntity();
			helloMsg.setCmdCode(CmdConstant.SAY_HELLO);
			helloMsg.setData(helloResp.toByteArray());
			ServerCache.sendToAll(helloMsg);// 此操作开销较大,一般不要如此或者分离到其它服务器
		}

	}

	private void handleSayHello(MsgEntity msgEntity, List<MsgEntity> commandList) {
		SayHelloReq req = null;
		try {
			req = SayHelloReq.parseFrom(msgEntity.getData());
		} catch (InvalidProtocolBufferException e) {
			System.err.println("protobuf解码错误");
			e.printStackTrace();
			return;
		}
		// 关键词过滤
		// 发言频率检测
		int playerId = ServerCache.get(msgEntity.getChannel());
		PlayerEntity pe = ServerCache.getPlayerById(playerId);
		if (pe != null) {
			SayHelloResp resp = SayHelloResp.newBuilder().setContent(req.getContent()).setSpeaker(pe.getName()).build();
			msgEntity.setData(resp.toByteArray());
			ServerCache.sendToAll(msgEntity);
		} else {
			System.err.println("玩家不存在");
		}

	}
}