refactor(server): eliminate Intermediary JSONRPCHandler for direct RequestHandler dispatching

[guglielmo-san]

Description

This branch eliminates the secondary layer of handling (JSONRPCHandler) by transferring dispatching duties immediately to DefaultRequestHandler.

Changes

• Completely dropped src/a2a/server/request_handlers/jsonrpc_handler.py.

• Refactored src/a2a/server/routes/jsonrpc_dispatcher.py to target dispatching precisely utilized mapping distinct transmissions natively.

Fixes #797 🦕

[gemini-code-assist]

Summary of Changes

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This pull request significantly refactors the server's JSON-RPC request handling by removing an unnecessary intermediary layer. Previously, JsonRpcDispatcher delegated to JSONRPCHandler, which then called the DefaultRequestHandler. This change allows JsonRpcDispatcher to directly interact with DefaultRequestHandler, simplifying the call stack, improving maintainability, and reducing boilerplate code. The core logic for processing JSON-RPC methods is now consolidated within the dispatcher, making the flow more direct and easier to understand.

Highlights

• Architectural Refactor: Eliminated the intermediary JSONRPCHandler class, streamlining the request dispatching process.
• Direct Dispatching: Refactored JsonRpcDispatcher to directly handle JSON-RPC requests by calling methods on DefaultRequestHandler, removing the need for an extra layer of indirection.
• Code Removal: Removed the jsonrpc_handler.py file and its associated test file, reducing codebase complexity.

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[github-actions]

🧪 Code Coverage (vs 1.0-dev)

⬇️ Download Full Report

	Base	PR	Delta
src/a2a/server/request_handlers/default_request_handler.py	96.89%	96.54%	🔴 -0.35%
src/a2a/server/routes/jsonrpc_dispatcher.py	85.78%	86.22%	🟢 +0.44%
Total	91.37%	91.30%	🔴 -0.07%

Generated by coverage-comment.yml

[gemini-code-assist]

Code Review

This pull request refactors the JSON-RPC handling by removing the dedicated JSONRPCHandler class and integrating its functionalities directly into the JsonRpcDispatcher. This includes moving request routing, response formatting, error handling, and capability validation logic into the dispatcher's _process_streaming_request and _process_non_streaming_request methods. Parameter names have been updated from http_handler to request_handler for consistency across the codebase and tests. Additionally, integration tests now explicitly set the A2A-Version header. There is no feedback to provide on the review comments as none were provided.