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sam-gardnersam-gardner
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BAEL-9013 Add code for intro to spring grpc
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‎pom.xml

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<module>spring-drools</module>
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<module>spring-ejb-modules</module>
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<module>spring-exceptions</module>
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<module>spring-grpc</module>
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<module>spring-jersey</module>
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<module>spring-kafka</module>
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<module>spring-kafka-2</module>
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<module>spring-drools</module>
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<module>spring-ejb-modules</module>
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<module>spring-exceptions</module>
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<module>spring-grpc</module>
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<module>spring-jersey</module>
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<module>spring-kafka</module>
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<module>spring-kafka-2</module>

‎spring-grpc/README.md

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## Spring Protocol Buffers
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This module contains articles about Spring with gRPC

‎spring-grpc/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>spring-grpc</artifactId>
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<version>0.1-SNAPSHOT</version>
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<name>spring-grpc</name>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-boot-3</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../parent-boot-3</relativePath>
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</parent>
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<dependencies>
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<dependency>
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<groupId>io.grpc</groupId>
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<artifactId>grpc-services</artifactId>
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<version>${grpc-services.version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.grpc</groupId>
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<artifactId>spring-grpc-spring-boot-starter</artifactId>
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<version>${spring-grpc.version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<version>${spring-boot.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.grpc</groupId>
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<artifactId>spring-grpc-test</artifactId>
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<version>${spring-grpc.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>ch.qos.logback</groupId>
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<artifactId>logback-core</artifactId>
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</dependency>
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<dependency>
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<groupId>ch.qos.logback</groupId>
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<artifactId>logback-classic</artifactId>
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</dependency>
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</dependencies>
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<dependencyManagement>
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<dependencies>
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<dependency>
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<groupId>org.springframework.grpc</groupId>
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<artifactId>spring-grpc-dependencies</artifactId>
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<version>${spring-grpc.version}</version>
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<type>pom</type>
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<scope>import</scope>
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</dependency>
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</dependencies>
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</dependencyManagement>
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<build>
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<plugins>
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<plugin>
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<groupId>kr.motd.maven</groupId>
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<artifactId>os-maven-plugin</artifactId>
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<version>1.7.1</version>
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<executions>
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<execution>
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<id>initialize</id>
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<phase>initialize</phase>
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<goals>
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<goal>detect</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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<plugin>
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<groupId>org.xolstice.maven.plugins</groupId>
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<artifactId>protobuf-maven-plugin</artifactId>
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<version>0.6.1</version>
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<configuration>
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<protocArtifact>com.google.protobuf:protoc:${protobuf-java.version}:exe:${os.detected.classifier}</protocArtifact>
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<pluginId>grpc-java</pluginId>
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<pluginArtifact>io.grpc:protoc-gen-grpc-java:${grpc.version}:exe:${os.detected.classifier}</pluginArtifact>
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</configuration>
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<executions>
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<execution>
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<id>compile</id>
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<goals>
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<goal>compile</goal>
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<goal>compile-custom</goal>
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</goals>
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<configuration>
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<pluginParameter>jakarta_omit,@generated=omit</pluginParameter>
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</configuration>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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<properties>
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<java.version>17</java.version>
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<grpc.version>1.72.0</grpc.version>
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<protobuf-java.version>4.30.2</protobuf-java.version>
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<spring-grpc.version>0.8.0</spring-grpc.version>
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<grpc-services.version>1.72.0</grpc-services.version>
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<spring-grpc.version>0.8.0</spring-grpc.version>
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<spring-boot.version>3.4.5</spring-boot.version>
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</properties>
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</project>

‎spring-grpc/src/main/java/com/baeldung/grpc/GrpcCalculatorService.java

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package com.baeldung.grpc;
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import org.springframework.stereotype.Service;
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import org.springframework.grpc.calculator.proto.CalculatorGrpc;
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import org.springframework.grpc.calculator.proto.Response;
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import org.springframework.grpc.calculator.proto.Request;
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import io.grpc.stub.StreamObserver;
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@Service
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public class GrpcCalculatorService extends CalculatorGrpc.CalculatorImplBase {
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@Override
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public void multiply(Request req, StreamObserver<Response> responseObserver) {
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Response reply = Response.newBuilder().setResult(req.getFirstValue() * req.getSecondValue()).build();
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responseObserver.onNext(reply);
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responseObserver.onCompleted();
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}
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}

‎spring-grpc/src/main/java/com/baeldung/grpc/SpringgRPCApplication.java

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package com.baeldung.grpc;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class SpringgRPCApplication {
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public static void main(String[] args) {
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SpringApplication.run(SpringgRPCApplication.class, args);
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}
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}

‎spring-grpc/src/main/proto/calculator.proto

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syntax = "proto3";
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option java_multiple_files = true;
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option java_package = "org.springframework.grpc.calculator.proto";
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option java_outer_classname = "CalculatorProto";
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service Calculator {
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rpc Multiply(Request) returns (Response) {}
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}
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message Request {
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int32 firstValue = 1;
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int32 secondValue = 2;
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}
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message Response {
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int32 result = 1;
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}

‎spring-grpc/src/main/resources/application.properties

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spring.application.name=Calculator

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