Add the protocol-comparison module

protocol-comparison/pom.xml

@@ -0,0 +1,95 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>org.springframework.boot</groupId>
+    <artifactId>spring-boot-starter-parent</artifactId>
+    <version>4.1.1</version>
+    <relativePath/>
+  </parent>
+
+  <groupId>com.ankurm</groupId>
+  <artifactId>protocol-comparison</artifactId>
+  <version>1.0</version>
+  <packaging>jar</packaging>
+
+  <properties>
+    <java.version>25</java.version>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <dependencies>
+    <!-- One application speaks all three protocols, so the comparison is not confounded by
+         different JVMs, different heaps or different warm-up states. -->
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-webmvc</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-websocket</artifactId>
+    </dependency>
+    <!-- RSocket. The starter drags in reactor-netty and jackson-dataformat-cbor; CBOR is not
+         an accident, it is RSocket's default data mime type in Spring. -->
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-rsocket</artifactId>
+    </dependency>
+    <!-- gRPC. Two starters, both Boot-managed. See ankurm.com/spring-grpc-spring-boot-4/ -->
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-grpc-server</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-grpc-client</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-jackson</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-test</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>io.projectreactor</groupId>
+      <artifactId>reactor-test</artifactId>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <!-- protoc and the gRPC codegen plugin resolve as Maven artifacts for this OS and
+           architecture. Nothing to install locally. Both versions come from the Boot BOM;
+           overriding them independently is how you get a NoSuchMethodError between grpc-java
+           and its shaded Netty. -->
+      <plugin>
+        <groupId>io.github.ascopes</groupId>
+        <artifactId>protobuf-maven-plugin</artifactId>
+        <version>3.9.0</version>
+        <configuration>
+          <protocVersion>${protobuf-java.version}</protocVersion>
+          <binaryMavenPlugins>
+            <binaryMavenPlugin>
+              <groupId>io.grpc</groupId>
+              <artifactId>protoc-gen-grpc-java</artifactId>
+              <version>${grpc-java.version}</version>
+            </binaryMavenPlugin>
+          </binaryMavenPlugins>
+        </configuration>
+        <executions>
+          <execution><goals><goal>generate</goal></goals></execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-maven-plugin</artifactId>
+      </plugin>
+    </plugins>
+  </build>
+</project>