fix: Add javadoc for grpc transport server-side modules

[kabir]

Fixes #479

[gemini-code-assist]

Summary of Changes

Hello @kabir, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the documentation for the gRPC transport server-side modules. The added Javadoc aims to provide a clearer understanding of how these components function, interact, and can be extended, thereby improving the developer experience and maintainability of the codebase. It covers the purpose, integration points, and operational details of the gRPC interceptors, handlers, and context mechanisms.

Highlights

• Comprehensive Javadoc Added: Extensive Javadoc documentation has been added to key server-side gRPC modules, including interceptors, handlers, and context factories, to improve clarity and understanding of their functionality and usage.
• Detailed Explanations for Core Components: The new documentation provides in-depth explanations of component architecture, request flow, CDI integration, error handling, and Python equivalence, making it easier for developers to integrate and extend the gRPC transport.
• Package-Level Documentation: New package-info.java files were introduced to provide high-level overviews of the Quarkus gRPC implementation and the core gRPC transport handler package.

Changelog

• reference/grpc/src/main/java/io/a2a/server/grpc/quarkus/A2AExtensionsInterceptor.java
  • Added detailed Javadoc to the class, explaining its role as a gRPC server interceptor, captured information, context storage, CDI integration, and Python equivalence.
  • Added comprehensive Javadoc to the interceptCall method, detailing its extraction process and parameters.
• reference/grpc/src/main/java/io/a2a/server/grpc/quarkus/QuarkusGrpcHandler.java
  • Added extensive Javadoc to the class, describing its function as a Quarkus gRPC service, CDI integration, security, interceptor registration, and extension points.
  • Added detailed Javadoc to the constructor, specifying required and optional dependencies.
  • Added Javadoc to the sendMessage method, outlining its protocol flow and error handling.
  • Added Javadoc to the sendStreamingMessage method, explaining its streaming characteristics, protocol flow, and error handling.
  • Added Javadoc to the convertToStreamResponse method, detailing backpressure handling, disconnect detection, and final event detection.
  • Added Javadoc to the createCallContext method, describing default and custom context creation.
  • Added Javadoc to the handleError method, explaining A2A error mappings to gRPC status codes.
  • Added Javadoc to the handleSecurityException method, detailing security exception mappings.
  • Added Javadoc to the getDeploymentClassLoader method.
  • Added Javadoc to the setStreamingSubscribedRunnable method.
  • Added Javadoc to the abstract methods getRequestHandler, getAgentCard, getExtendedAgentCard, getCallContextFactory, and getExecutor.
• reference/grpc/src/main/java/io/a2a/server/grpc/quarkus/QuarkusGrpcTransportMetadata.java
  • Added detailed Javadoc to the class, explaining its role as a transport metadata provider, CDI integration, and use cases.
  • Added Javadoc to the getTransportProtocol method.
• reference/grpc/src/main/java/io/a2a/server/grpc/quarkus/package-info.java
  • Added new package-level Javadoc, describing the Quarkus gRPC reference implementation, architecture, core components, gRPC methods, CDI integration, usage, configuration, customization, and Python equivalence.
• transport/grpc/src/main/java/io/a2a/transport/grpc/context/GrpcContextKeys.java
  • Added detailed Javadoc to the class, explaining its purpose for shared gRPC context keys, usage examples, and context population.
  • Added comprehensive Javadoc to the METHOD_MAPPING field, detailing the translation of gRPC method names to A2A protocol method names.
• transport/grpc/src/main/java/io/a2a/transport/grpc/handler/CallContextFactory.java
  • Added detailed Javadoc to the interface, explaining its role as a factory for ServerCallContext, default behavior, and custom implementation examples.
  • Added Javadoc to the create method, describing its purpose and implementation guidelines.
• transport/grpc/src/main/java/io/a2a/transport/grpc/handler/package-info.java
  • Added package-level Javadoc, describing the gRPC transport handler implementations, gRPC protocol details, supported methods, and context access.

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[gemini-code-assist]

Code Review

The pull request adds comprehensive Javadoc to the gRPC transport server-side modules, significantly improving maintainability and providing clear guidance for developers. The documentation includes architecture overviews, CDI integration details, and mapping between gRPC and A2A protocol concepts. I have identified some discrepancies in the method name mappings documented in GrpcContextKeys.java which should be corrected to ensure consistency with the actual implementation in GrpcHandler.

[kabir]

/gemini review

[gemini-code-assist]

Code Review

This pull request significantly improves the documentation for the gRPC server-side modules by adding comprehensive Javadoc to classes, methods, and packages. The new documentation is well-structured and detailed, which will be very helpful for developers. I've found one issue in the Javadoc for METHOD_MAPPING in GrpcContextKeys.java where the documented behavior doesn't match the code, which could be misleading. My review includes a suggestion to correct this.

[kabir]

/gemini review

[gemini-code-assist]

Code Review

The pull request significantly improves the Javadoc documentation across several gRPC-related classes and the package-info.java files. This enhancement provides clearer explanations of functionality, architecture, CDI integration, and error handling, which will greatly benefit developers using or maintaining this codebase. The added details, especially the code examples and flow descriptions, make the modules much more understandable. All changes are well-justified and contribute positively to the project's maintainability and clarity.