Merge branch 'master' into bael-16656

grpc/README.md

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+## gRPC
+
+This module contains articles about gRPC
+
+### Relevant Articles:
+- [Introduction to gRPC](https://www.baeldung.com/grpc-introduction)

grpc/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>grpc</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+	<name>grpc</name>
+    <packaging>jar</packaging>
+	
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.grpc</groupId>
+            <artifactId>grpc-netty</artifactId>
+            <version>${io.grpc.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.grpc</groupId>
+            <artifactId>grpc-protobuf</artifactId>
+            <version>${io.grpc.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.grpc</groupId>
+            <artifactId>grpc-stub</artifactId>
+            <version>${io.grpc.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <extensions>
+            <extension>
+                <groupId>kr.motd.maven</groupId>
+                <artifactId>os-maven-plugin</artifactId>
+                <version>${os-maven-plugin.version}</version>
+            </extension>
+        </extensions>
+        <plugins>
+            <plugin>
+                <groupId>org.xolstice.maven.plugins</groupId>
+                <artifactId>protobuf-maven-plugin</artifactId>
+                <version>${protobuf-maven-plugin.version}</version>
+                <configuration>
+                    <protocArtifact>
+                        com.google.protobuf:protoc:3.3.0:exe:${os.detected.classifier}
+                    </protocArtifact>
+                    <pluginId>grpc-java</pluginId>
+                    <pluginArtifact>
+                        io.grpc:protoc-gen-grpc-java:1.4.0:exe:${os.detected.classifier}
+                    </pluginArtifact>
+                </configuration>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>compile</goal>
+                            <goal>compile-custom</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <io.grpc.version>1.16.1</io.grpc.version>
+        <os-maven-plugin.version>1.6.1</os-maven-plugin.version>
+        <protobuf-maven-plugin.version>0.6.1</protobuf-maven-plugin.version>
+    </properties>
+</project>

grpc/src/main/java/org/baeldung/grpc/client/GrpcClient.java

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+package org.baeldung.grpc.client;
+
+import org.baeldung.grpc.HelloRequest;
+import org.baeldung.grpc.HelloResponse;
+import org.baeldung.grpc.HelloServiceGrpc;
+
+import io.grpc.ManagedChannel;
+import io.grpc.ManagedChannelBuilder;
+
+public class GrpcClient {
+    public static void main(String[] args) throws InterruptedException {
+        ManagedChannel channel = ManagedChannelBuilder.forAddress("localhost", 8080)
+            .usePlaintext()
+            .build();
+
+        HelloServiceGrpc.HelloServiceBlockingStub stub 
+          = HelloServiceGrpc.newBlockingStub(channel);
+
+        HelloResponse helloResponse = stub.hello(HelloRequest.newBuilder()
+            .setFirstName("Baeldung")
+            .setLastName("gRPC")
+            .build());
+
+        System.out.println("Response received from server:\n" + helloResponse);
+
+        channel.shutdown();
+    }
+}

grpc/src/main/java/org/baeldung/grpc/server/GrpcServer.java

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+package org.baeldung.grpc.server;
+
+import java.io.IOException;
+
+import io.grpc.Server;
+import io.grpc.ServerBuilder;
+
+public class GrpcServer {
+    public static void main(String[] args) throws IOException, InterruptedException {
+        Server server = ServerBuilder.forPort(8080)
+          .addService(new HelloServiceImpl()).build();
+
+        System.out.println("Starting server...");
+        server.start();
+        System.out.println("Server started!");
+        server.awaitTermination();
+    }
+}

grpc/src/main/java/org/baeldung/grpc/server/HelloServiceImpl.java

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+package org.baeldung.grpc.server;
+
+import org.baeldung.grpc.HelloRequest;
+import org.baeldung.grpc.HelloResponse;
+import org.baeldung.grpc.HelloServiceGrpc.HelloServiceImplBase;
+
+import io.grpc.stub.StreamObserver;
+
+public class HelloServiceImpl extends HelloServiceImplBase {
+
+    @Override
+    public void hello(
+      HelloRequest request, StreamObserver<HelloResponse> responseObserver) {
+        System.out.println("Request received from client:\n" + request);
+
+        String greeting = new StringBuilder().append("Hello, ")
+            .append(request.getFirstName())
+            .append(" ")
+            .append(request.getLastName())
+            .toString();
+
+        HelloResponse response = HelloResponse.newBuilder()
+            .setGreeting(greeting)
+            .build();
+
+        responseObserver.onNext(response);
+        responseObserver.onCompleted();
+    }
+}

grpc/src/main/proto/HelloService.proto

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+syntax = "proto3";
+option java_multiple_files = true;
+package org.baeldung.grpc;
+
+message HelloRequest {
+    string firstName = 1;
+    string lastName = 2;
+}
+
+message HelloResponse {
+    string greeting = 1;
+}
+
+service HelloService {
+    rpc hello(HelloRequest) returns (HelloResponse);
+}

grpc/src/main/resources/logback.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>