Architectural Layers

FOSPS is structured using a three-layer architecture that separates concerns and enables modularity.

The Three Layers

1. App Layer

The front-end layer containing:

• Patient-facing applications
• Healthcare professional (HCP) interfaces
• Administrator web interfaces
• Developer tools and dashboards

Examples:

• Focusing Inspector
• Supporting Material Tool
• CTF Inspector

2. Service Layer

The core operations layer housing:

• Processing and analysis components
• AI services and NLP services
• Connectors to data sources
• Orchestration services

Key Components:

• Focusing Manager
• Preprocessors
• Lens Execution Environment (LEE)
• Content Trust Framework (CTF)

3. Data Layer

The storage layer containing:

• FHIR Servers for standardized resources
• Sensitive data (e.g., patient IPS)
• Non-sensitive data (e.g., public ePI)
• Lenses and Supporting Material

Benefits of This Architecture

• Separation of Concerns: Each layer has distinct responsibilities
• Scalability: Layers can scale independently
• Modularity: Components can be developed and deployed separately
• Flexibility: Easy to swap implementations within layers

Deployment

Each layer is deployed using:

• Kubernetes for orchestration
• Istio for service mesh
• Helm Charts for packaging

Related Concepts

• FOSPS - Overall platform architecture
• Focusing Manager - Service layer orchestration
• FHIR Server - Data layer storage