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Jainam Shah - Project Portfolio Page

Overview

Crypto1010 is a CLI blockchain wallet simulator for students to learn blockchain fundamentals such as wallet-based transfers, block linkage, and chain validation through hands-on command usage.

My focus was improving the transfer flow (send), including stronger argument handling, clearer behavior documentation, and UML artifacts that explain the design and data flow to future contributors.

Summary of Contributions

Code contributed

• [Code Dashboard link: View my code contributions]

Enhancements implemented

• Designed and added new SendCommand UML diagrams (class, validation sequence, activity) in both PUML and PNG formats. Integrated these into the Developer Guide and referenced in PPP.
• Updated the Developer Guide and PPP to clarify and expand on transfer, validation, persistence, and testing contributions.
• Enforced key generation before send: updated send command logic and all related tests to require keygen before sending.
• Improved error handling and output for HelpCommand, CrossSendCommand, and BalanceCommand.
• Refactored CrossSendCommandTest and other test classes for clarity, consistency, and checkstyle compliance.
• Enhanced UI output: implemented table-like formatting, improved spacing, and headers for commands.
• Improved wallet safety and user-facing behavior (for example, key/address handling and balance-related edge cases).
• Enhanced transfer flow behavior, including fee-policy support (speed tiers and manual override) and clearer execution summaries.
• Added/updated comprehensive JUnit tests for SendCommand, BalanceCommand, CrossSendCommand, and related flows to ensure robust behavior and edge case coverage.
• Improved error messages and user feedback for invalid command formats and edge cases.

Storage persistence contributions

• Fixed persistence and wallet bugs, improved save-to-disk and autosave logic, and clarified persistence documentation.
• Contributed to making storage behavior more stable and predictable during load/save cycles.
• Helped document and clarify persistence logic in the Developer Guide.

Issue contributions on GitHub (summary)

• Resolved a wide range of issues across multiple releases, including bug fixes, enhancements, and documentation updates.
• Representative completed issues include:
  • #82: Update Developer Guide and User Guide and PPP: Coordinated and contributed to major documentation updates for the Developer Guide, User Guide, and PPP.
  • #168: send rounds very small remaining balances down to 0, hiding non-zero funds: Fixed rounding logic in the send command to ensure accurate display of small balances.
  • #178: send works without keygen (contradicts User Guide): Enforced key generation before sending, aligning implementation with documentation.
  • #78: Better CLI UX (Formatting Upgrade): Improved CLI formatting for a more user-friendly experience.
  • #68: Extracting a shared utility method from BalanceCommand.java: Refactored code to improve maintainability and reduce duplication.
  • #66: Extracting validation and output in SendCommand.java: Separated validation and output logic for better code clarity.
  • #8: Record successful send transactions to wallet history and autosave: Implemented autosave and transaction history recording for send operations.
  • #7: Add fee policy for send: default speed, speed tiers, manual override: Added flexible fee policy options to the send command.
  • #6: Implement send command with amount/address validation: Developed the core send command with robust validation.
  • #56: Blockchain data doesn’t persist across sessions: Fixed a critical bug where blockchain data was not reliably saved and loaded.
  • #55: balance command doesn’t check for if wallet name is valid: Improved validation in the balance command.
  • #54: help c/COMMAND_NAME should show ideal format for command input: Enhanced the help command to display correct command formats.
  • #53: standardize balance for all wallets generated: Standardized wallet balance initialization and display.
  • #52: Wallet address shown before key generation: Ensured wallet addresses are only shown after key generation.
  • #48: Save to hard disk not working: Fixed a major persistence bug where data was not being saved to disk.
• These issues span persistence, validation, CLI UX, documentation, and feature enhancements. Each fix or enhancement involved careful testing and collaboration to ensure robust, user-friendly behavior.

Contributions to the User Guide

• Updated send command documentation to keep command format and behavior clear.
• Added a Coming Soon section describing planned account-switching capability and persistence scope.
• Clarified error messages and command usage in the documentation for new users.

Contributions to the Developer Guide

• Added/updated DG sections describing:
• send command implementation details
• design rationale and dependencies around SendCommand
• UML diagram references for maintainers (including new SendCommand class, validation sequence, and activity diagrams)
• Persistence and storage design for blockchain and wallet data
• Documented and clarified the validation and error handling logic for transfers and persistence
• Other refactoring changes
• Wallet Persistence

Contributions to team-based tasks

• Updated project documentation structure and cross-references between DG and diagram sources.
• Maintained branch hygiene by creating focused branches and commits for separate concerns (code quality vs documentation), and by frequent rebases and merges.
• Participated in team meetings and discussions to plan features and resolve blockers, and contributed to PR reviews and issue triage.

Developer Guide extracts

SendCommand implementation and structure

I documented the send flow and design responsibilities in the DG, emphasizing:

• command-level validation responsibilities,
• delegation to TransactionRecordingService, and
• the UML view of static dependencies used in transfer execution.

UML diagrams contributed

• docs/diagrams/SendCommandClassDiagram.puml
• docs/diagrams/SendCommandActivity.puml
• docs/diagrams/SendCommandValidationSequence.puml