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satellite-provider/_docs/02_document/module-layout.md
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Oleksandr Bezdieniezhnykh 08451df027
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[AZ-350] Close 03-code-quality-refactoring: Phase 6+7 + FINAL_report 
Phase 6 (Verification): smoke run green (format gate + 200/200
unit + integration smoke). verification_report.md captures
metric deltas vs Phase 0 baseline; all 5 ACs met, all 4
constraints honored, 0 regressions.

Phase 7 (Documentation):
- module-layout.md: corrected DataAccess->Common dependency
  (was mistakenly documented as "Imports from: (none)" by
  prior AZ-315 baseline; csproj reference + 7 import sites
  have actually been there since AZ-309).
- architecture_compliance_baseline.md: F5 entry revised to
  reflect the actual layering invariant (one-way: Common
  MUST NOT import from DataAccess, but DataAccess MAY
  import from Common).
- 00_discovery.md: added "Updates Since Baseline" section
  enumerating the AZ-309 split + AZ-350 27-change run +
  AZ-372 tooling additions; original tree kept as a
  2026-05-10 snapshot.

FINAL_report: complete run summary (10 batches, 27 tasks,
3 K=3 cumulative reviews, baseline->final metric table,
remaining items, lessons learned).

Autodev state: advance Step 8 -> Step 9 (New Task);
sub_step reset to phase 0 awaiting-invocation.

Co-authored-by: Cursor <cursoragent@cursor.com>
2026-05-11 05:23:35 +03:00

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Module Layout

Status: derived-from-code

Language: csharp Layout Convention: custom (per-component .csproj per logical component) Root: ./ Last Updated: 2026-05-11 (post AZ-350 03-code-quality-refactoring run; corrects DataAccess→Common dependency)

Layout Rules

  1. Each component owns ONE top-level project directory (.csproj boundary). The previous shared SatelliteProvider.Services project was split into three per-component csprojs in epic AZ-309.
  2. Shared code lives under SatelliteProvider.Common/ — the foundation layer.
  3. Cross-cutting concerns (DTOs, interfaces, configs, geo-math, common exceptions) all reside in Common.
  4. Public API surface per component = public types in the namespace root. Everything marked internal or private is internal.
  5. Tests live in separate projects: SatelliteProvider.Tests/ (unit) and SatelliteProvider.IntegrationTests/ (integration).
  6. DI registration per component lives in a <Component>ServiceCollectionExtensions.cs adjacent to the component's classes (e.g. TileDownloaderServiceCollectionExtensions.AddTileDownloader()).

Per-Component Mapping

Component: Common

  • Directory: SatelliteProvider.Common/
  • Public API:
    • SatelliteProvider.Common/Configs/MapConfig.cs
    • SatelliteProvider.Common/Configs/StorageConfig.cs
    • SatelliteProvider.Common/Configs/ProcessingConfig.cs
    • SatelliteProvider.Common/Configs/DatabaseConfig.cs
    • SatelliteProvider.Common/DTO/*.cs (all DTOs)
    • SatelliteProvider.Common/Exceptions/RateLimitException.cs
    • SatelliteProvider.Common/Interfaces/*.cs (all service interfaces)
    • SatelliteProvider.Common/Utils/GeoUtils.cs
  • Internal: (none — all types are public, shared across components)
  • Owns: SatelliteProvider.Common/**
  • Imports from: (none)
  • Consumed by: DataAccess, TileDownloader, RegionProcessing, RouteManagement, WebApi

Component: DataAccess

  • Directory: SatelliteProvider.DataAccess/
  • Public API:
    • SatelliteProvider.DataAccess/Models/TileEntity.cs
    • SatelliteProvider.DataAccess/Models/RegionEntity.cs
    • SatelliteProvider.DataAccess/Models/RouteEntity.cs
    • SatelliteProvider.DataAccess/Models/RoutePointEntity.cs
    • SatelliteProvider.DataAccess/Repositories/ITileRepository.cs
    • SatelliteProvider.DataAccess/Repositories/IRegionRepository.cs
    • SatelliteProvider.DataAccess/Repositories/IRouteRepository.cs
    • SatelliteProvider.DataAccess/Repositories/TileRepository.cs
    • SatelliteProvider.DataAccess/Repositories/RegionRepository.cs
    • SatelliteProvider.DataAccess/Repositories/RouteRepository.cs
    • SatelliteProvider.DataAccess/DatabaseMigrator.cs
  • Internal: (none — all repository types are public for DI registration)
  • Owns: SatelliteProvider.DataAccess/**
  • ProjectReferences: SatelliteProvider.Common
  • Imports from: SatelliteProvider.Common.Enums (5 sites: RegionRepository, IRegionRepository, Models/RegionEntity, Models/RoutePointEntity, TypeHandlers/EnumStringTypeHandler); SatelliteProvider.Common.Configs (MapConfig.DefaultTileSizePixels in TileRepository); SatelliteProvider.Common.Utils (GeoUtils.EarthEquatorialCircumferenceMeters, GeoUtils.MetersPerDegreeLatitude in TileRepository).
  • Consumed by: TileDownloader, RegionProcessing, RouteManagement, WebApi

Component: TileDownloader

  • Directory: SatelliteProvider.Services.TileDownloader/
  • csproj: SatelliteProvider.Services.TileDownloader/SatelliteProvider.Services.TileDownloader.csproj
  • Public API:
    • SatelliteProvider.Services.TileDownloader/GoogleMapsDownloaderV2.cs (implements ISatelliteDownloader)
    • SatelliteProvider.Services.TileDownloader/TileService.cs (implements ITileService)
    • SatelliteProvider.Services.TileDownloader/TileDownloaderServiceCollectionExtensions.cs (DI: AddTileDownloader())
  • Internal: (none)
  • Owns: SatelliteProvider.Services.TileDownloader/**
  • ProjectReferences: SatelliteProvider.Common, SatelliteProvider.DataAccess
  • Imports from: Common, DataAccess
  • Consumed by: RegionProcessing (via ITileService from Common; no direct ProjectReference), WebApi

Component: RegionProcessing

  • Directory: SatelliteProvider.Services.RegionProcessing/
  • csproj: SatelliteProvider.Services.RegionProcessing/SatelliteProvider.Services.RegionProcessing.csproj
  • Public API:
    • SatelliteProvider.Services.RegionProcessing/RegionService.cs (implements IRegionService)
    • SatelliteProvider.Services.RegionProcessing/RegionProcessingService.cs (background hosted service)
    • SatelliteProvider.Services.RegionProcessing/RegionRequestQueue.cs (implements IRegionRequestQueue)
    • SatelliteProvider.Services.RegionProcessing/RegionProcessingServiceCollectionExtensions.cs (DI: AddRegionProcessing())
  • Internal: (none)
  • Owns: SatelliteProvider.Services.RegionProcessing/**
  • ProjectReferences: SatelliteProvider.Common, SatelliteProvider.DataAccess
  • Imports from: Common, DataAccess (uses ITileService from Common — no compile-time dependency on TileDownloader)
  • Consumed by: RouteManagement (via IRegionService and IRegionRequestQueue from Common; no direct ProjectReference), WebApi

Component: RouteManagement

  • Directory: SatelliteProvider.Services.RouteManagement/
  • csproj: SatelliteProvider.Services.RouteManagement/SatelliteProvider.Services.RouteManagement.csproj
  • Public API:
    • SatelliteProvider.Services.RouteManagement/RouteService.cs (implements IRouteService)
    • SatelliteProvider.Services.RouteManagement/RouteProcessingService.cs (background hosted service)
    • SatelliteProvider.Services.RouteManagement/RouteManagementServiceCollectionExtensions.cs (DI: AddRouteManagement())
  • Internal: (none)
  • Owns: SatelliteProvider.Services.RouteManagement/**
  • ProjectReferences: SatelliteProvider.Common, SatelliteProvider.DataAccess
  • Imports from: Common, DataAccess (uses IRegionService / IRegionRequestQueue from Common — no compile-time dependency on RegionProcessing)
  • Consumed by: WebApi

Component: WebApi

  • Directory: SatelliteProvider.Api/
  • Public API:
    • SatelliteProvider.Api/Program.cs (minimal API endpoints, DI setup)
  • Internal: (none)
  • Owns: SatelliteProvider.Api/**
  • Imports from: Common, DataAccess, TileDownloader, RegionProcessing, RouteManagement
  • Consumed by: (none — top-level entry point)

Shared / Cross-Cutting

Common/Configs

  • Directory: SatelliteProvider.Common/Configs/
  • Purpose: Strongly-typed configuration POCOs bound via IOptions<T>
  • Consumed by: all components

Common/DTO

  • Directory: SatelliteProvider.Common/DTO/
  • Purpose: Data transfer objects shared across layers (request/response models, value types)
  • Consumed by: all components

Common/Interfaces

  • Directory: SatelliteProvider.Common/Interfaces/
  • Purpose: Service contracts enabling DI and testability
  • Consumed by: all components (services implement, API and consumers depend on)

Common/Utils

  • Directory: SatelliteProvider.Common/Utils/
  • Purpose: Stateless geospatial utility functions (coordinate math, distance, bearing)
  • Consumed by: TileDownloader, RegionProcessing, RouteManagement

Allowed Dependencies (layering)

Layer Components May import from (compile-time ProjectReferences)
4. API / Entry WebApi Common, DataAccess, TileDownloader, RegionProcessing, RouteManagement
3. Application TileDownloader, RegionProcessing, RouteManagement Common, DataAccess only — siblings communicate through interfaces in Common, never through direct ProjectReferences
1. Foundation Common (leaf-most), DataAccess Common: (none); DataAccess: Common only — Common MUST NOT import from DataAccess

Key constraint enforced by the AZ-309 split: the three Layer-3 components are compile-time siblings. Any cross-sibling call (e.g. RegionProcessing invoking tile download) MUST go through an interface defined in SatelliteProvider.Common.Interfaces and resolved via DI — adding a ProjectReference between siblings is now structurally impossible without re-introducing the coupling the refactor removed.

Verification

  • No detected cycles: The dependency graph is a clean DAG.
  • No cross-sibling ProjectReferences: TileDownloader, RegionProcessing, and RouteManagement each reference only Common + DataAccess. Verified by inspecting all three csproj files.
  • DataAccess layer placement: DataAccess sits at Layer 1 (Foundation) alongside Common because it is consumed uniformly by all service components. It is one half-step above Common because it depends on Common for shared enums and a small number of constants/configs.
  • DataAccess→Common ProjectReference: confirmed present in SatelliteProvider.DataAccess.csproj line 18 and used by 7 source sites (5 enum imports, 1 MapConfig.DefaultTileSizePixels site, 1 GeoUtils.* site). The earlier compliance baseline F5 entry that claimed "DataAccess has no Common dependency" was inaccurate — both module-layout.md and architecture_compliance_baseline.md were corrected during the 03-code-quality-refactoring run (2026-05-11). The actual constraint that holds is one-way: Common MUST NOT import from DataAccess.
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