Netty Google Protobuf

1.编码和解码的基本介绍：
1) 编写网络应用程序时，因为数据在网络中传输的都是二进制字节码数据，在发送数据时就需要编码，接收数据时就需要解码 [示意图]
2) codec(编解码器) 的组成部分有两个： decoder(解码器)和 encoder(编码器)。 encoder 负责把业务数据转换成字节码数据， decoder 负责把字节码数据转换成业务数据

2.Netty 本身的编码解码的机制和问题分析

1) Netty 自身提供了一些 codec(编解码器)
2) Netty 提供的编码器
StringEncoder，对字符串数据进行编码
ObjectEncoder，对 Java 对象进行编码
...
3) Netty 提供的解码器
StringDecoder, 对字符串数据进行解码
ObjectDecoder，对 Java 对象进行解码
...
4) Netty 本身自带的 ObjectDecoder 和 ObjectEncoder 可以用来实现 POJO 对象或各种业务对象的编码和解码，底层使用的仍是 Java 序列化技术 ,

而 Java 序列化技术本身效率就不高，存在如下问题无法跨语言序列化后的体积太大，是二进制编码的 5 倍多。序列化性能太低
5) => 引出新的解决方案 [Google 的 Protobuf]

3.Protobuf
1) Protobuf 基本介绍和使用示意图

2) Protobuf 是 Google 发布的开源项目，全称 Google Protocol Buffers，是一种轻便高效的结构化数据存储格式，可以用于结构化数据串行化，

或者说序列化。它很适合做数据存储或 RPC[远程过程调用 remote procedure call ] 数据交换格式。目前很多公司 http+json tcp+protobuf

3) 参考文档 : https://developers.google.com/protocol-buffers/docs/proto 语言指南
4) Protobuf 是以 message 的方式来管理数据的.
5) 支持跨平台、跨语言，即[客户端和服务器端可以是不同的语言编写的] （支持目前绝大多数语言，例如 C++、C#、 Java、 python 等）
6) 高性能，高可靠性
7) 使用 protobuf 编译器能自动生成代码， Protobuf 是将类的定义使用.proto 文件进行描述。说明，在 idea 中编写 .proto 文件时，会自动提示是否下载 .ptotot 编写插件. 可以让语法高亮。
8) 然后通过 protoc.exe 编译器根据.proto 自动生成.java 文件

4 Protobuf 快速入门实例

编写程序，使用 Protobuf 完成如下功能
1) 客户端可以发送一个 Student PoJo 对象到服务器 (通过 Protobuf 编码)
2) 服务端能接收 Student PoJo 对象，并显示信息(通过 Protobuf 解码)

Student.proto

syntax = "proto3"; //版本
option java_outer_classname = "StudentPOJO";//生成的外部类名， 同时也是文件名
//protobuf 使用 message 管理数据
message Student { //会在 StudentPOJO 外部类生成一个内部类 Student， 他是真正发送的 POJO 对象
int32 id = 1; // Student 类中有 一个属性 名字为 id 类型为 int32(protobuf 类型) 1 表示属性序号， 不是值
string name = 2;
}

View Code

编译
protoc.exe --java_out=. Student.proto
将生成的 StudentPOJO 放入到项目使用

NettyClient

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
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.protobuf.ProtobufEncoder;

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

        //客户端需要一个事件循环组
        EventLoopGroup group = new NioEventLoopGroup();


        try {
            //创建客户端启动对象
            //注意客户端使用的不是 ServerBootstrap 而是 Bootstrap
            Bootstrap bootstrap = new Bootstrap();

            //设置相关参数
            bootstrap.group(group) //设置线程组
                    .channel(NioSocketChannel.class) // 设置客户端通道的实现类(反射)
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            ChannelPipeline pipeline = ch.pipeline();
                            //在pipeline中加入 ProtoBufEncoder
                            pipeline.addLast("encoder", new ProtobufEncoder());
                            pipeline.addLast(new NettyClientHandler()); //加入自己的处理器
                        }
                    });

            System.out.println("客户端 ok..");

            //启动客户端去连接服务器端
            //关于 ChannelFuture 要分析，涉及到netty的异步模型
            ChannelFuture channelFuture = bootstrap.connect("127.0.0.1", 6668).sync();
            //给关闭通道进行监听
            channelFuture.channel().closeFuture().sync();
        }finally {

            group.shutdownGracefully();

        }
    }
}

View Code

NettyClientHandler

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;

public class NettyClientHandler extends ChannelInboundHandlerAdapter {

    //当通道就绪就会触发该方法
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {

        //发生一个Student 对象到服务器

        StudentPOJO.Student student = StudentPOJO.Student.newBuilder().setId(4).setName("智多星 吴用").build();
        //Teacher , Member ,Message
        ctx.writeAndFlush(student);
    }

    //当通道有读取事件时，会触发
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {

        ByteBuf buf = (ByteBuf) msg;
        System.out.println("服务器回复的消息:" + buf.toString(CharsetUtil.UTF_8));
        System.out.println("服务器的地址： "+ ctx.channel().remoteAddress());
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.close();
    }
}

View Code

NettyServer

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.protobuf.ProtobufDecoder;

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


        //创建BossGroup 和 WorkerGroup
        //说明
        //1. 创建两个线程组 bossGroup 和 workerGroup
        //2. bossGroup 只是处理连接请求 , 真正的和客户端业务处理，会交给 workerGroup完成
        //3. 两个都是无限循环
        //4. bossGroup 和 workerGroup 含有的子线程(NioEventLoop)的个数
        //   默认实际 cpu核数 * 2
        EventLoopGroup bossGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup(); //8



        try {
            //创建服务器端的启动对象，配置参数
            ServerBootstrap bootstrap = new ServerBootstrap();

            //使用链式编程来进行设置
            bootstrap.group(bossGroup, workerGroup) //设置两个线程组
                    .channel(NioServerSocketChannel.class) //使用NioSocketChannel 作为服务器的通道实现
                    .option(ChannelOption.SO_BACKLOG, 128) // 设置线程队列得到连接个数
                    .childOption(ChannelOption.SO_KEEPALIVE, true) //设置保持活动连接状态
//                    .handler(null) // 该 handler对应 bossGroup , childHandler 对应 workerGroup
                    .childHandler(new ChannelInitializer<SocketChannel>() {//创建一个通道初始化对象(匿名对象)
                        //给pipeline 设置处理器
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {


                            ChannelPipeline pipeline = ch.pipeline();
                            //在pipeline加入ProtoBufDecoder
                            //指定对哪种对象进行解码
                            pipeline.addLast("decoder", new ProtobufDecoder(StudentPOJO.Student.getDefaultInstance()));
                            pipeline.addLast(new NettyServerHandler());
                        }
                    }); // 给我们的workerGroup 的 EventLoop 对应的管道设置处理器

            System.out.println(".....服务器 is ready...");

            //绑定一个端口并且同步, 生成了一个 ChannelFuture 对象
            //启动服务器(并绑定端口)
            ChannelFuture cf = bootstrap.bind(6668).sync();

            //给cf 注册监听器，监控我们关心的事件

            cf.addListener(new ChannelFutureListener() {
                @Override
                public void operationComplete(ChannelFuture future) throws Exception {
                    if (cf.isSuccess()) {
                        System.out.println("监听端口 6668 成功");
                    } else {
                        System.out.println("监听端口 6668 失败");
                    }
                }
            });


            //对关闭通道进行监听
            cf.channel().closeFuture().sync();
        }finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }

    }

}

View Code

NettyServerHandler

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.*;
import io.netty.util.CharsetUtil;

/*
说明
1. 我们自定义一个Handler 需要继续netty 规定好的某个HandlerAdapter(规范)
2. 这时我们自定义一个Handler , 才能称为一个handler
 */
//public class NettyServerHandler extends ChannelInboundHandlerAdapter {
public class NettyServerHandler extends SimpleChannelInboundHandler<StudentPOJO.Student> {


    //读取数据实际(这里我们可以读取客户端发送的消息)
    /*
    1. ChannelHandlerContext ctx:上下文对象, 含有 管道pipeline , 通道channel, 地址
    2. Object msg: 就是客户端发送的数据 默认Object
     */
    @Override
    public void channelRead0(ChannelHandlerContext ctx, StudentPOJO.Student msg) throws Exception {

        //读取从客户端发送的StudentPojo.Student


        System.out.println("客户端发送的数据 id=" + msg.getId() + " 名字=" + msg.getName());
    }



//    //读取数据实际(这里我们可以读取客户端发送的消息)
//    /*
//    1. ChannelHandlerContext ctx:上下文对象, 含有 管道pipeline , 通道channel, 地址
//    2. Object msg: 就是客户端发送的数据 默认Object
//     */
//    @Override
//    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
//
//        //读取从客户端发送的StudentPojo.Student
//
//        StudentPOJO.Student student = (StudentPOJO.Student) msg;
//
//        System.out.println("客户端发送的数据 id=" + student.getId() + " 名字=" + student.getName());
//    }

    //数据读取完毕
    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {

        //writeAndFlush 是 write + flush
        //将数据写入到缓存，并刷新
        //一般讲，我们对这个发送的数据进行编码
        ctx.writeAndFlush(Unpooled.copiedBuffer("hello, 客户端~(>^ω^<)喵1", CharsetUtil.UTF_8));
    }

    //处理异常, 一般是需要关闭通道

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        ctx.close();
    }
}

View Code

生成的 StudentPOJO

public final class StudentPOJO {
  private StudentPOJO() {}
  public static void registerAllExtensions(
      com.google.protobuf.ExtensionRegistryLite registry) {
  }

  public static void registerAllExtensions(
      com.google.protobuf.ExtensionRegistry registry) {
    registerAllExtensions(
        (com.google.protobuf.ExtensionRegistryLite) registry);
  }
  public interface StudentOrBuilder extends
      // @@protoc_insertion_point(interface_extends:Student)
      com.google.protobuf.MessageOrBuilder {

    /**
     * <pre>
     * Student 类中有 一个属性 名字为 id 类型为int32(protobuf类型) 1表示属性序号，不是值
     * </pre>
     *
     * <code>int32 id = 1;</code>
     */
    int getId();

    /**
     * <code>string name = 2;</code>
     */
    String getName();
    /**
     * <code>string name = 2;</code>
     */
    com.google.protobuf.ByteString
        getNameBytes();
  }
  /**
   * <pre>
   *protobuf 使用message 管理数据
   * </pre>
   *
   * Protobuf type {@code Student}
   */
  public  static final class Student extends
      com.google.protobuf.GeneratedMessageV3 implements
      // @@protoc_insertion_point(message_implements:Student)
      StudentOrBuilder {
  private static final long serialVersionUID = 0L;
    // Use Student.newBuilder() to construct.
    private Student(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
      super(builder);
    }
    private Student() {
      id_ = 0;
      name_ = "";
    }

    @Override
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    private Student(
        com.google.protobuf.CodedInputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      this();
      if (extensionRegistry == null) {
        throw new NullPointerException();
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            case 8: {

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              break;
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              name_ = s;
              break;
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        throw new com.google.protobuf.InvalidProtocolBufferException(
            e).setUnfinishedMessage(this);
      } finally {
        this.unknownFields = unknownFields.build();
        makeExtensionsImmutable();
      }
    }
    public static final com.google.protobuf.Descriptors.Descriptor
        getDescriptor() {
      return StudentPOJO.internal_static_Student_descriptor;
    }

    @Override
    protected FieldAccessorTable
        internalGetFieldAccessorTable() {
      return StudentPOJO.internal_static_Student_fieldAccessorTable
          .ensureFieldAccessorsInitialized(
              Student.class, Builder.class);
    }

    public static final int ID_FIELD_NUMBER = 1;
    private int id_;
    /**
     * <pre>
     * Student 类中有 一个属性 名字为 id 类型为int32(protobuf类型) 1表示属性序号，不是值
     * </pre>
     *
     * <code>int32 id = 1;</code>
     */
    public int getId() {
      return id_;
    }

    public static final int NAME_FIELD_NUMBER = 2;
    private volatile Object name_;
    /**
     * <code>string name = 2;</code>
     */
    public String getName() {
      Object ref = name_;
      if (ref instanceof String) {
        return (String) ref;
      } else {
        com.google.protobuf.ByteString bs = 
            (com.google.protobuf.ByteString) ref;
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        name_ = s;
        return s;
      }
    }
    /**
     * <code>string name = 2;</code>
     */
    public com.google.protobuf.ByteString
        getNameBytes() {
      Object ref = name_;
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        com.google.protobuf.ByteString b = 
            com.google.protobuf.ByteString.copyFromUtf8(
                (String) ref);
        name_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
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    private byte memoizedIsInitialized = -1;
    @Override
    public final boolean isInitialized() {
      byte isInitialized = memoizedIsInitialized;
      if (isInitialized == 1) return true;
      if (isInitialized == 0) return false;

      memoizedIsInitialized = 1;
      return true;
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    @Override
    public void writeTo(com.google.protobuf.CodedOutputStream output)
                        throws java.io.IOException {
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      unknownFields.writeTo(output);
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    @Override
    public int getSerializedSize() {
      int size = memoizedSize;
      if (size != -1) return size;

      size = 0;
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    @Override
    public boolean equals(final Object obj) {
      if (obj == this) {
       return true;
      }
      if (!(obj instanceof Student)) {
        return super.equals(obj);
      }
      Student other = (Student) obj;

      boolean result = true;
      result = result && (getId()
          == other.getId());
      result = result && getName()
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    @Override
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      int hash = 41;
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      hash = (37 * hash) + ID_FIELD_NUMBER;
      hash = (53 * hash) + getId();
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      hash = (53 * hash) + getName().hashCode();
      hash = (29 * hash) + unknownFields.hashCode();
      memoizedHashCode = hash;
      return hash;
    }

    public static Student parseFrom(
        java.nio.ByteBuffer data)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data);
    }
    public static Student parseFrom(
        java.nio.ByteBuffer data,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data, extensionRegistry);
    }
    public static Student parseFrom(
        com.google.protobuf.ByteString data)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data);
    }
    public static Student parseFrom(
        com.google.protobuf.ByteString data,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data, extensionRegistry);
    }
    public static Student parseFrom(byte[] data)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data);
    }
    public static Student parseFrom(
        byte[] data,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data, extensionRegistry);
    }
    public static Student parseFrom(java.io.InputStream input)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseWithIOException(PARSER, input);
    }
    public static Student parseFrom(
        java.io.InputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseWithIOException(PARSER, input, extensionRegistry);
    }
    public static Student parseDelimitedFrom(java.io.InputStream input)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseDelimitedWithIOException(PARSER, input);
    }
    public static Student parseDelimitedFrom(
        java.io.InputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
    }
    public static Student parseFrom(
        com.google.protobuf.CodedInputStream input)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseWithIOException(PARSER, input);
    }
    public static Student parseFrom(
        com.google.protobuf.CodedInputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseWithIOException(PARSER, input, extensionRegistry);
    }

    @Override
    public Builder newBuilderForType() { return newBuilder(); }
    public static Builder newBuilder() {
      return DEFAULT_INSTANCE.toBuilder();
    }
    public static Builder newBuilder(Student prototype) {
      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
    }
    @Override
    public Builder toBuilder() {
      return this == DEFAULT_INSTANCE
          ? new Builder() : new Builder().mergeFrom(this);
    }

    @Override
    protected Builder newBuilderForType(
        BuilderParent parent) {
      Builder builder = new Builder(parent);
      return builder;
    }
    /**
     * <pre>
     *protobuf 使用message 管理数据
     * </pre>
     *
     * Protobuf type {@code Student}
     */
    public static final class Builder extends
        com.google.protobuf.GeneratedMessageV3.Builder<Builder> implements
        // @@protoc_insertion_point(builder_implements:Student)
        StudentOrBuilder {
      public static final com.google.protobuf.Descriptors.Descriptor
          getDescriptor() {
        return StudentPOJO.internal_static_Student_descriptor;
      }

      @Override
      protected FieldAccessorTable
          internalGetFieldAccessorTable() {
        return StudentPOJO.internal_static_Student_fieldAccessorTable
            .ensureFieldAccessorsInitialized(
                Student.class, Builder.class);
      }

      // Construct using StudentPOJO.Student.newBuilder()
      private Builder() {
        maybeForceBuilderInitialization();
      }

      private Builder(
          BuilderParent parent) {
        super(parent);
        maybeForceBuilderInitialization();
      }
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      }

      @Override
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        return Student.getDefaultInstance();
      }

      @Override
      public Student build() {
        Student result = buildPartial();
        if (!result.isInitialized()) {
          throw newUninitializedMessageException(result);
        }
        return result;
      }

      @Override
      public Student buildPartial() {
        Student result = new Student(this);
        result.id_ = id_;
        result.name_ = name_;
        onBuilt();
        return result;
      }

      @Override
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        return (Builder) super.clone();
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      @Override
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        if (other instanceof Student) {
          return mergeFrom((Student)other);
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          super.mergeFrom(other);
          return this;
        }
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      public Builder mergeFrom(Student other) {
        if (other == Student.getDefaultInstance()) return this;
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      @Override
      public final boolean isInitialized() {
        return true;
      }

      @Override
      public Builder mergeFrom(
          com.google.protobuf.CodedInputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws java.io.IOException {
        Student parsedMessage = null;
        try {
          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
          parsedMessage = (Student) e.getUnfinishedMessage();
          throw e.unwrapIOException();
        } finally {
          if (parsedMessage != null) {
            mergeFrom(parsedMessage);
          }
        }
        return this;
      }

      private int id_ ;
      /**
       * <pre>
       * Student 类中有 一个属性 名字为 id 类型为int32(protobuf类型) 1表示属性序号，不是值
       * </pre>
       *
       * <code>int32 id = 1;</code>
       */
      public int getId() {
        return id_;
      }
      /**
       * <pre>
       * Student 类中有 一个属性 名字为 id 类型为int32(protobuf类型) 1表示属性序号，不是值
       * </pre>
       *
       * <code>int32 id = 1;</code>
       */
      public Builder setId(int value) {
        
        id_ = value;
        onChanged();
        return this;
      }
      /**
       * <pre>
       * Student 类中有 一个属性 名字为 id 类型为int32(protobuf类型) 1表示属性序号，不是值
       * </pre>
       *
       * <code>int32 id = 1;</code>
       */
      public Builder clearId() {
        
        id_ = 0;
        onChanged();
        return this;
      }

      private Object name_ = "";
      /**
       * <code>string name = 2;</code>
       */
      public String getName() {
        Object ref = name_;
        if (!(ref instanceof String)) {
          com.google.protobuf.ByteString bs =
              (com.google.protobuf.ByteString) ref;
          String s = bs.toStringUtf8();
          name_ = s;
          return s;
        } else {
          return (String) ref;
        }
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       * <code>string name = 2;</code>
       */
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          getNameBytes() {
        Object ref = name_;
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              com.google.protobuf.ByteString.copyFromUtf8(
                  (String) ref);
          name_ = b;
          return b;
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        }
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       * <code>string name = 2;</code>
       */
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          String value) {
        if (value == null) {
    throw new NullPointerException();
  }
  
        name_ = value;
        onChanged();
        return this;
      }
      /**
       * <code>string name = 2;</code>
       */
      public Builder clearName() {
        
        name_ = getDefaultInstance().getName();
        onChanged();
        return this;
      }
      /**
       * <code>string name = 2;</code>
       */
      public Builder setNameBytes(
          com.google.protobuf.ByteString value) {
        if (value == null) {
    throw new NullPointerException();
  }
  checkByteStringIsUtf8(value);
        
        name_ = value;
        onChanged();
        return this;
      }
      @Override
      public final Builder setUnknownFields(
          final com.google.protobuf.UnknownFieldSet unknownFields) {
        return super.setUnknownFieldsProto3(unknownFields);
      }

      @Override
      public final Builder mergeUnknownFields(
          final com.google.protobuf.UnknownFieldSet unknownFields) {
        return super.mergeUnknownFields(unknownFields);
      }


      // @@protoc_insertion_point(builder_scope:Student)
    }

    // @@protoc_insertion_point(class_scope:Student)
    private static final Student DEFAULT_INSTANCE;
    static {
      DEFAULT_INSTANCE = new Student();
    }

    public static Student getDefaultInstance() {
      return DEFAULT_INSTANCE;
    }

    private static final com.google.protobuf.Parser<Student>
        PARSER = new com.google.protobuf.AbstractParser<Student>() {
      @Override
      public Student parsePartialFrom(
          com.google.protobuf.CodedInputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws com.google.protobuf.InvalidProtocolBufferException {
        return new Student(input, extensionRegistry);
      }
    };

    public static com.google.protobuf.Parser<Student> parser() {
      return PARSER;
    }

    @Override
    public com.google.protobuf.Parser<Student> getParserForType() {
      return PARSER;
    }

    @Override
    public Student getDefaultInstanceForType() {
      return DEFAULT_INSTANCE;
    }

  }

  private static final com.google.protobuf.Descriptors.Descriptor
    internal_static_Student_descriptor;
  private static final 
    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
      internal_static_Student_fieldAccessorTable;

  public static com.google.protobuf.Descriptors.FileDescriptor
      getDescriptor() {
    return descriptor;
  }
  private static  com.google.protobuf.Descriptors.FileDescriptor
      descriptor;
  static {
    String[] descriptorData = {
      "\n\rStudent.proto\"#\n\007Student\022\n\n\002id\030\001 \001(\005\022\014" +
      "\n\004name\030\002 \001(\tB\rB\013StudentPOJOb\006proto3"
    };
    com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner assigner =
        new com.google.protobuf.Descriptors.FileDescriptor.    InternalDescriptorAssigner() {
          public com.google.protobuf.ExtensionRegistry assignDescriptors(
              com.google.protobuf.Descriptors.FileDescriptor root) {
            descriptor = root;
            return null;
          }
        };
    com.google.protobuf.Descriptors.FileDescriptor
      .internalBuildGeneratedFileFrom(descriptorData,
        new com.google.protobuf.Descriptors.FileDescriptor[] {
        }, assigner);
    internal_static_Student_descriptor =
      getDescriptor().getMessageTypes().get(0);
    internal_static_Student_fieldAccessorTable = new
      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
        internal_static_Student_descriptor,
        new String[] { "Id", "Name", });
  }

  // @@protoc_insertion_point(outer_class_scope)
}

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