# Network Library Phase 3: Message Routing Implementation Tasks

This document breaks down the Phase 3 implementation plan into specific tasks to be completed. Each task represents a discrete unit of work that can be implemented and tested independently.

## 1. Core Routing Types and Interfaces

- [ ] Create `RouteInfo` interface to represent routing information
- [ ] Create `RoutingTable` interface for route storage and retrieval
- [ ] Define `IMessageRouter` interface with core routing methods
- [ ] Create `RoutingStrategy` enum for different routing approaches
- [ ] Define `RoutingConfig` interface for router configuration

## 2. Basic Routing Table Implementation

- [ ] Implement `BasicRoutingTable` class
- [ ] Add methods for adding, retrieving, and removing routes
- [ ] Implement route filtering functionality
- [ ] Add utility methods for finding optimal routes
- [ ] Create comprehensive unit tests for routing table

## 3. Message Priority and Batching

- [ ] Implement `PriorityQueue` class for message prioritization
- [ ] Create `MessageBatch` class for grouping related messages
- [ ] Implement batching logic with configurable intervals
- [ ] Add priority-based message processing
- [ ] Create unit tests for priority queue and batching

## 4. Base Message Router

- [ ] Implement abstract `BaseMessageRouter` class
- [ ] Add support for multiple routing tables
- [ ] Implement route finding across tables
- [ ] Create framework for batch processing
- [ ] Add infrastructure for router plugins
- [ ] Create tests for base functionality

## 5. Routing Strategies

- [ ] Implement `DirectMessageRouter` for direct connections
- [ ] Create `FloodMessageRouter` for broadcast-style delivery
- [ ] Implement `ShortestPathRouter` for optimized routing
- [ ] Add `RandomRouter` for testing and simulation
- [ ] Create strategy factory for dynamic strategy creation
- [ ] Test each strategy independently and in combination

## 6. Route Discovery

- [ ] Implement `RouteDiscoveryManager` for finding routes
- [ ] Create discovery message types and handlers
- [ ] Add route optimization based on network metrics
- [ ] Implement age-based route pruning
- [ ] Create tests for route discovery process

## 7. Advanced Router with Plugins

- [ ] Define `RouterPlugin` interface for router extensions
- [ ] Implement `AdvancedMessageRouter` with plugin support
- [ ] Add lifecycle hooks for routing events
- [ ] Create error handling and retry mechanisms
- [ ] Implement route fallback strategies
- [ ] Test plugin integration and extension points

## 8. Network Metrics and QoS

- [ ] Add support for Quality-of-Service (QoS) levels
- [ ] Implement message delivery guarantees
- [ ] Create network metric collection system
- [ ] Add route scoring based on reliability and latency
- [ ] Implement adaptive routing based on network conditions
- [ ] Test QoS under various network conditions

## 9. Integration with Transport Layer

- [ ] Update `NetworkNode` to use message router
- [ ] Integrate with existing transport system
- [ ] Ensure compatibility with transport plugins
- [ ] Update event system for routing events
- [ ] Create integration tests with transport layer

## 10. Performance Testing and Optimization

- [ ] Create benchmarks for routing performance
- [ ] Test with large message volumes
- [ ] Optimize critical routing paths
- [ ] Implement routing caches
- [ ] Test memory usage under load
- [ ] Document performance characteristics

## 11. Documentation and Examples

- [ ] Create detailed API documentation
- [ ] Write usage guidelines for routing system
- [ ] Create example network topologies
- [ ] Document plugin development process
- [ ] Create tutorial for custom routing strategies
- [ ] Add complete code samples

## 12. Final Integration and Testing

- [ ] Ensure all components work together
- [ ] Test with simulated network conditions
- [ ] Create end-to-end tests for complete workflows
- [ ] Perform security audit of routing implementation
- [ ] Validate backwards compatibility with Phase 2
- [ ] Finalize phase documentation