Add compile time codegen tool

eng/versioning/external_dependencies.txt

@@ -53,8 +53,10 @@ com.microsoft.azure.functions:azure-functions-java-library;2.2.0
 com.mysql:mysql-connector-j;9.0.0
 com.squareup.okhttp3:mockwebserver;4.12.0
 com.squareup.okhttp3:okhttp;4.12.0
+com.squareup:javapoet;1.13.0
 commons-codec:commons-codec;1.15
 commons-net:commons-net;3.9.0
+io.clientcore.tools:sdk-codegen-tool;1.0.0-beta.1
 io.cloudevents:cloudevents-api;2.2.0
 io.cloudevents:cloudevents-core;2.2.0
 io.fabric8:kubernetes-client;6.12.1

sdk/clientcore/pom.xml

@@ -13,5 +13,6 @@
     <module>core</module>
     <module>http-okhttp3</module>
     <module>http-stress</module>
+    <module>tools</module>
   </modules>
 </project>

sdk/clientcore/tools/pom.xml

@@ -0,0 +1,14 @@
+<!-- Copyright (c) Microsoft Corporation. All rights reserved.
+     Licensed under the MIT License. -->
+<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>
+  <groupId>io.clientcore</groupId>
+  <artifactId>clientcore-tools-service</artifactId>
+  <packaging>pom</packaging>
+  <version>1.0.0</version> <!-- Need not change for every release-->
+  <modules>
+    <module>sdk-codegen-tool</module>
+  </modules>
+</project>

sdk/clientcore/tools/sdk-codegen-tool/README.md

@@ -0,0 +1,135 @@
+# Codegen Compile time generator Plugin
+
+A Java annotation processor for generating HTTP service implementations based on annotated interfaces.
+
+## Usage
+
+1. Add the plugin dependency:
+   ```xml
+   <dependencies>
+    <dependency>
+        <groupId>io.clientcore.tools</groupId>
+        <artifactId>sdk-codegen-tool</artifactId>
+        <version>1.0.0.beta.1</version> <!-- {x-version-update;io.clientcore.tools:sdk-codegen-tool;external_dependency} -->
+        <scope>provided</scope>
+    </dependency>
+   </dependencies>
+   ```
+   1.1. Add the plugin configuration to your `pom.xml`:
+   ```xml
+   <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.11.0</version> <!-- {x-version-update;org.apache.maven.plugins:maven-compiler-plugin;external_dependency} -->
+        <configuration>
+          <generatedSourcesDirectory>${project.build.directory}/generated-sources/</generatedSourcesDirectory>
+          <annotationProcessors>
+            <annotationProcessor>io.generation.tools.codegen.AnnotationProcessor</annotationProcessor>
+          </annotationProcessors>
+        </configuration>
+      </plugin>
+    </plugins>
+   ```
+2. Annotate your interfaces with `@ServiceInterface`,  `@HttpRequestInformation` and 
+   `@UnexpectedResponseExceptionDetail` such annotations:
+   ```java 
+   @ServiceInterface(name = "ExampleClient", host = "{endpoint}/example")
+   public interface ExampleService {
+       @HttpRequestInformation(method = HttpMethod.GET, path = "/user/{userId}", expectedStatusCodes = { 200 })
+       @UnexpectedResponseExceptionDetail(exceptionTypeName = "CLIENT_AUTHENTICATION", statusCode = { 401 })
+       @UnexpectedResponseExceptionDetail(exceptionTypeName = "RESOURCE_NOT_FOUND", statusCode = { 404 })
+       @UnexpectedResponseExceptionDetail(exceptionTypeName = "RESOURCE_MODIFIED", statusCode = { 409 })
+       User getUser(@PathParam("userId") String userId);
+   }
+   ```
+
+3. Build your project and the plugin will generate an implementation of the annotated interface.
+   The processor would generate an implementation:
+   ```java
+   public class ExampleServiceImpl implements ExampleService {
+    private static final ClientLogger LOGGER = new ClientLogger(OpenAIClientServiceImpl.class);
+
+    private final HttpPipeline defaultPipeline;
+
+    private final ObjectSerializer serializer;
+
+    private final String endpoint;
+
+    private final OpenAIServiceVersion serviceVersion;
+
+    private String apiVersion;
+
+    public OpenAIClientServiceImpl(HttpPipeline defaultPipeline, ObjectSerializer serializer,
+       String endpoint, OpenAIServiceVersion serviceVersion) {
+       this.defaultPipeline = defaultPipeline;
+       this.serializer = serializer;
+       this.endpoint = endpoint;
+       this.apiVersion = serviceVersion.getVersion();
+       this.serviceVersion = serviceVersion;
+    }
+
+    public String getEndpoint() {
+        return endpoint;
+    }
+
+    public HttpPipeline getPipeline() {    
+        return defaultPipeline;
+    }
+
+    public OpenAIServiceVersion getServiceVersion() {
+        return serviceVersion;
+    }
+
+    private final HttpPipeline pipeline;
+
+    public ExampleServiceImpl(HttpPipeline pipeline) {
+        this.pipeline = pipeline;
+    }
+
+    public Response<BinaryData> getUser(String userId, Context context) {
+        return getUser(endpoint, apiVersion, userId, context);
+    }
+
+    @Override
+    private Response<BinaryData> getUser(String endpoint, String apiVersion, String userId, Context context) {
+        HttpPipeline pipeline = this.getPipeline();
+        String host = endpoint + "/example/users/" + userId + "?api-version=" + apiVersion;
+
+        // create the request
+        HttpRequest httpRequest = new HttpRequest(HttpMethod.GET, host);
+
+        // set the headers
+        HttpHeaders headers = new HttpHeaders();
+        httpRequest.setHeaders(headers);
+
+        // add RequestOptions to the request
+        httpRequest.setRequestOptions(requestOptions);
+
+        // set the body content if present
+
+        // send the request through the pipeline
+        Response<?> response = pipeline.send(httpRequest);
+
+        final int responseCode = response.getStatusCode();
+        boolean expectedResponse = responseCode == 200;
+        if (!expectedResponse) {
+            throw new RuntimeException("Unexpected response code: " + responseCode);
+        }
+        ResponseBodyMode responseBodyMode = ResponseBodyMode.IGNORE;
+        if (requestOptions != null) {
+            responseBodyMode = requestOptions.getResponseBodyMode();
+        }
+        if (responseBodyMode == ResponseBodyMode.DESERIALIZE) {
+            BinaryData responseBody = response.getBody();
+            HttpResponseAccessHelper.setValue((HttpResponse<?>) response, responseBody);
+        } else {
+            BinaryData responseBody = response.getBody();
+            HttpResponseAccessHelper.setBodyDeserializer((HttpResponse<?>) response, (body) -> responseBody);
+        }
+        return (Response<BinaryData>) response;
+    }
+   }
+   ```
+This implementation eliminates reflection and integrates directly with your HTTP client infrastructure.
+

sdk/clientcore/tools/sdk-codegen-tool/pom.xml

@@ -0,0 +1,112 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<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>
+
+  <groupId>io.clientcore.tools</groupId>
+  <artifactId>sdk-codegen-tool</artifactId>
+  <version>1.0.0-beta.1</version> <!-- {x-version-update;io.clientcore.tools:sdk-codegen-tool;external_dependency} -->
+
+  <name>Clientcore codegen tool</name>
+  <description>A Java annotation processor tool for generating HTTP service implementations</description>
+
+  <distributionManagement>
+    <snapshotRepository>
+      <id>ossrh</id>
+      <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+    </snapshotRepository>
+    <repository>
+      <id>ossrh</id>
+      <url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url>
+    </repository>
+  </distributionManagement>
+
+  <url>https://github.com/azure/azure-sdk-for-java</url>
+  <organization>
+    <name>Microsoft Corporation</name>
+    <url>http://microsoft.com</url>
+  </organization>
+  <licenses>
+    <license>
+      <name>The MIT License (MIT)</name>
+      <url>http://opensource.org/licenses/MIT</url>
+      <distribution>repo</distribution>
+    </license>
+  </licenses>
+
+  <developers>
+    <developer>
+      <id>microsoft</id>
+      <name>Microsoft Corporation</name>
+    </developer>
+  </developers>
+
+  <issueManagement>
+    <system>GitHub</system>
+    <url>https://github.com/Azure/azure-sdk-for-java/issues</url>
+  </issueManagement>
+
+  <scm>
+    <url>https://github.com/Azure/azure-sdk-for-java</url>
+    <connection>scm:git:https://github.com/Azure/azure-sdk-for-java.git</connection>
+    <developerConnection/>
+    <tag>HEAD</tag>
+  </scm>
+
+  <properties>
+    <maven.compiler.source>8</maven.compiler.source>
+    <maven.compiler.target>8</maven.compiler.target>
+    <packageOutputDirectory>${project.build.directory}</packageOutputDirectory>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.squareup</groupId>
+      <artifactId>javapoet</artifactId>
+      <version>1.13.0</version> <!-- {x-version-update;com.squareup:javapoet;external_dependency} -->
+    </dependency>
+    <dependency>
+      <groupId>io.clientcore</groupId>
+      <artifactId>core</artifactId>
+      <version>1.0.0-beta.1</version> <!-- {x-version-update;io.clientcore:core;dependency} -->
+      <scope>compile</scope>
+    </dependency>
+
+    <!-- Unit Test -->
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-api</artifactId>
+      <version>5.11.2</version> <!-- {x-version-update;org.junit.jupiter:junit-jupiter-api;external_dependency} -->
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
+      <version>5.11.2</version> <!-- {x-version-update;org.junit.jupiter:junit-jupiter-engine;external_dependency} -->
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-params</artifactId>
+      <version>5.11.2</version> <!-- {x-version-update;org.junit.jupiter:junit-jupiter-params;external_dependency} -->
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-core</artifactId>
+      <version>4.11.0</version> <!-- {x-version-update;org.mockito:mockito-core;external_dependency} -->
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <resources>
+      <resource>
+        <directory>src/main/resources</directory>
+        <filtering>true</filtering>
+      </resource>
+    </resources>
+  </build>
+</project>