Core Architectural Patterns

This document provides an overview of the core architectural patterns that make up the NERV architecture. These patterns build upon the foundational design primitives to create powerful, composable building blocks for Atlas’s core services.

Pattern Overview

NERV defines six core architectural patterns that together create a flexible, introspectable, and composable system:

Pattern	Purpose	Key Implementation	Library Foundation
Reactive Event Mesh	Decoupled communication	EventBus	Blinker
Temporal Versioning	Complete history tracking	TemporalStore	Eventsourcing
Perspective Shifting	Context-appropriate views	PerspectiveAware	Marshmallow
State Projection	Efficient state evolution	StateProjector	Pyrsistent
Effect System	Explicit side effects	EffectMonad	Effect
Quantum Partitioning	Optimal parallelism	QuantumPartitioner	TaskMap

Library Implementation

Each pattern is implemented using specific Python libraries that provide proven, robust foundations:

Pattern	Primary Library	Key Features	Usage in NERV
Reactive Event Mesh	Blinker	Signal dispatch system, lightweight, thread-safe	Event distribution and subscription
Temporal Versioning	Eventsourcing	Event-based persistence, temporal storage	Historical state management
Perspective Shifting	Marshmallow	Schema-based validation and transformation	Perspective-based data conversion
State Projection	Pyrsistent	Immutable data structures, structural sharing	Efficient state evolution
Effect System	Effect	Monadic effect tracking, functional composition	Explicit side effect management
Quantum Partitioning	TaskMap	Dependency-based execution, parallel processing	Optimized concurrent execution

Core Type Foundations

These patterns build upon foundational types and interfaces:

• Types: Core type definitions and data classes
• Interfaces: Foundational protocol definitions
• Boundaries: System boundary concepts

Pattern Relationships

The core patterns interact in meaningful ways:

Key Benefits

These architectural patterns provide several key benefits:

Pattern	Key Benefits
Reactive Event Mesh	Decoupling, Observability, Extensibility
Temporal Versioning	Undo/Redo, Debugging, Reproducibility
Perspective Shifting	Adaptability, Separation of Concerns, Multiple Views
State Projection	Efficiency, Consistency, Traceability
Effect System	Explicit Side Effects, Composability, Testability
Quantum Partitioning	Parallelism, Resource Optimization, Dependency Management

Primitive Foundations

Each pattern is built on specific primitive design patterns:

NERV Pattern	Primitive Composition	Implementation Library
Reactive Event Mesh	Observer + Command + Factory	Blinker
Temporal Versioning	Command + Decorator + Factory	Eventsourcing
Perspective Shifting	Strategy + Decorator + Factory	Marshmallow
State Projection	Command + Strategy + Builder	Pyrsistent
Effect System	Command + Monad + Decorator	Effect
Quantum Partitioning	Builder + DAG + Factory	TaskMap

Components and Implementation

Each pattern has a corresponding component implementation:

• Reactive Event Mesh: Implemented by EventBus using Blinker
• Temporal Versioning: Implemented by TemporalStore using Eventsourcing
• Perspective Shifting: Implemented by PerspectiveAware using Marshmallow
• State Projection: Implemented by StateProjector using Pyrsistent
• Effect System: Implemented by EffectMonad using Effect
• Quantum Partitioning: Implemented by QuantumPartitioner using TaskMap

These components are then combined into composite systems to create complete architectural solutions.

Integration Architecture

The integration between patterns and their library implementations creates a cohesive architecture:

Learn More

Explore each pattern in detail:

• Reactive Event Mesh: Decoupled communication with Blinker
• Temporal Versioning: Complete history tracking with Eventsourcing
• Perspective Shifting: Context-appropriate views with Marshmallow
• State Projection: Efficient state evolution with Pyrsistent
• Effect System: Explicit side effects with Effect
• Quantum Partitioning: Optimal parallelism with TaskMap

Or explore the foundation types:

• Types: Core type definitions
• Interfaces: Protocol interfaces
• Boundaries: System boundaries