[Improvement]: Add Support for Restart Requests in the Ballerina Debug Server

[NipunaRanasinghe]

Description

Currently, the Ballerina debug server does not support handling restart requests as per the Debug Adapter Protocol (DAP). When users initiate a restart request during a debugging session in VS Code, the following behavior is observed:

• VS Code sends a terminate request, shutting down the active debug server instance.
• A new debug server process is spawned and initialized to continue the debugging session.

This approach leads to increased startup time, negatively affecting the user experience during iterative debugging workflows.
Therefore this improvement aims to support restart requests from the Ballerina debug server side, which will reduce startup time during debug session restarts for enhanced efficiency and user experience for developers using the Ballerina debug server with VS Code.

Describe your solution(s)

• Implement support for restart requests in the Ballerina debug server.
• Allow the debug server to reset its state and reinitialize the debugging session without requiring a full termination and reinitialization process.

Challenges:

The current design of the Ballerina debug server supports only a single session per instance. Implementing restart request support will require significant changes to the existing implementation.

Related area

-> Debugger

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