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This commit adds a complete implementation of the Raft consensus algorithm,
providing a robust solution for achieving consensus in distributed systems.
Key features implemented:
- Three-state system: Follower, Candidate, and Leader states
- Leader election with randomized election timeouts (150-300ms)
- Log replication for state machine commands
- Heartbeat mechanism to maintain leader authority
- Safety guarantees through term numbers and log consistency checks
- Proper handling of split votes and network partitions
Implementation details:
- Added VSRaftProtocol.java with full Raft algorithm logic
- Integrated with existing event-driven simulation framework
- Supports dynamic cluster sizes with proper quorum calculations
- Implements RequestVote and AppendEntries RPCs
- Maintains persistent state (currentTerm, votedFor, log entries)
- Includes comprehensive logging for debugging and visualization
Testing:
- Added VSRaftProtocolTest.java with unit tests covering:
- Leader election scenarios
- Log replication mechanics
- State transitions
- Message handling for all RPC types
Integration:
- Registered protocol in VSRegisteredEvents for simulator discovery
- Added human-readable names in VSDefaultPrefs for UI display
- Compatible with existing visualization and timing systems
This implementation follows the Raft paper closely while adapting to
the simulator's event-driven architecture and message-passing model.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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- Convert VS3Tupel and VSLamportTime to records for immutability
- Use switch expressions with pattern matching in VSTimestampTriggeredEvent
- Modernize exception handling with pattern matching in VSErrorHandler
- Replace anonymous ActionListener with lambda in VSAboutFrame
- Use formatted strings instead of concatenation in VSDummyProtocol
- Add sealed hierarchy VSEventType for exhaustive pattern matching
- Create VSSimulationConfig record for configuration management
- Maintain backward compatibility with deprecated methods
All 132 unit tests pass successfully with Java 21 features.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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- Add language strings for all timestamp events and demo protocol in VSDefaultPrefs
- Register new timestamp events and protocol in VSRegisteredEvents:
- VSLamportTimestampEvent
- VSVectorTimestampEvent
- VSTimestampMonitorEvent
- VSTimestampTriggeredEvent
- VSTimestampDemoProtocol
- Integrate VSVectorClockMonitor into VSInternalProcess:
- Add vectorClockMonitor field
- Override increaseVectorTime() and updateVectorTime() to trigger monitor
- Clear monitor events on reset
- Add getVectorClockMonitor() accessor
- Add serialization support to VSTimestampTriggeredEvent for persistence
- Fix VSTimestampDemoProtocol to use process's vector clock monitor
- All 132 unit tests pass
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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Major improvements:
1. Replace instanceof checks with polymorphic methods in VSAbstractEvent hierarchy
- Added isInternalEvent(), isMessageReceiveEvent(), etc. methods
- Added getEventPriority() for clean event ordering
- Added shouldIncreaseTimestamps() to control timestamp behavior
- Refactored VSTask to use these polymorphic methods
2. Extract magic numbers and strings to constants
- Created VSConstants class for centralized configuration values
- Added event priority constants (PRIORITY_HIGHEST, PRIORITY_HIGH, etc.)
- Extracted string constants like CLASS_PREFIX
- Moved magic numbers to named constants (PERCENTAGE_RANGE, etc.)
3. Update tests to work with new polymorphic approach
- Fixed mocking in VSTaskTest to return correct values
- All 132 tests passing
These changes improve maintainability, reduce coupling, and make the codebase
more self-documenting. The polymorphic approach eliminates type checking and
makes it easier to add new event types.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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config, update README and .gitignore
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