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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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