protobuf 分布式数据模型

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优点

  • 多语言共用
  • 方便定义，不需手动创建，直接编译生成
  • 序列化数据更小，序列化时不会带参名，反序列化时通过参数列表排序来赋值

使用

  • 需要在 pom.xml 文件中新增编译器 

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    <!-- 方式 1 配置更全 -->
    <plugin>
        <groupId>org.xolstice.maven.plugins</groupId>
        <artifactId>protobuf-maven-plugin</artifactId>
        <version>0.6.1</version>
        <configuration>
            <protocArtifact>com.google.protobuf:protoc:3.7.1:exe:${os.detected.classifier}</protocArtifact>
            <outputDirectory>build/generated/source/proto/main/java</outputDirectory>
            <clearOutputDirectory>false</clearOutputDirectory>
            <protocPlugins>
                <protocPlugin>
                    <id>dubbo</id>
                    <groupId>org.apache.dubbo</groupId>
                    <artifactId>dubbo-compiler</artifactId>
                    <version>0.0.4.1-SNAPSHOT</version>
                    <mainClass>org.apache.dubbo.gen.tri.Dubbo3TripleGenerator</mainClass>
                </protocPlugin>
            </protocPlugins>
        </configuration>
        <executions>
            <execution>
                <goals>
                    <goal>compile</goal>
                    <goal>test-compile</goal>
                </goals>
            </execution>
        </executions>
    </plugin>

    <!-- 方式 2 -->
    <plugin>
        <groupId>org.xolstice.maven.plugins</groupId>
        <artifactId>protobuf-maven-plugin</artifactId>
        <version>0.6.1</version>
        <configuration>
            <protocArtifact>com.google.protobuf:protoc:3.19.2:exe:${os.detected.classifier}</protocArtifact>
            <pluginId>grpc-java</pluginId>
            <pluginArtifact>io.grpc:protoc-gen-grpc-java:1.45.1:exe:${os.detected.classifier}</pluginArtifact>
        </configuration>
        <executions>
            <execution>
                <goals>
                    <goal>compile</goal>
                    <goal>compile-custom</goal>
                </goals>
            </execution>
        </executions>
    </plugin>

protobuf 文件格式：

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syntax = "proto3";

package com.yyh;

option java_multiple_files = true;
option java_package = "com.yyh";
option java_outer_classname = "UserServiceProto";

service UserService {
  rpc GetUser (UserRequest) returns (User) {}
  rpc ServerGetUser (UserRequest) returns (stream User) {}
  rpc ClientGetUser (stream UserRequest) returns (User) {}
  rpc BiGetUser (stream UserRequest) returns (stream User) {}
}

// The response message containing the greetings
message UserRequest {
  string uid = 1;
}

// The response message containing the greetings
message User {
  string uid = 1; // 排序 
  string username = 2;
}