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Oleksandr Bezdieniezhnykh 6b373082c8 [AZ-315] Sync architecture docs after coupling refactor

Phase C of architecture coupling refactor (epic AZ-309). Closes the
last baseline finding (F5 — DataAccess incorrectly documented as
importing Common) and synchronizes the rest of _docs/02_document/
with the post-split project layout from AZ-312/313/314:

- module-layout.md: per-component sections for the three new csprojs
  with explicit ProjectReferences and the no-cross-sibling-reference
  invariant the split enforces.
- architecture.md: components and internal-communication tables
  updated to show calls flow through Common interfaces.
- architecture_compliance_baseline.md: F1..F5 marked Resolved with
  task IDs and commit refs; baseline summary now 0 findings.
- diagrams/components.md, components/03_tile_downloader/description.md,
  modules/{common_interfaces,services_tile_service,
  services_google_maps_downloader,tests_unit}.md updated for the
  split, RateLimitException relocation, and new ITileService methods.

Documentation-only batch — no code, no tests, no build changes.
Epic AZ-309 complete (6 tasks across 3 batches).

Co-authored-by: Cursor <cursoragent@cursor.com>

2026-05-10 07:25:21 +03:00

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Module: Services/TileService

Purpose

Orchestrates tile downloading and persistence. Bridges the downloader (Google Maps) with the tile repository (PostgreSQL), handling in-memory caching, entity creation, and metadata mapping. Single ownership point for all tile read/write business logic — both region-batch and single-tile API endpoints route through this service.

csproj: SatelliteProvider.Services.TileDownloader/TileService.cs

Public Interface

TileService (implements ITileService)

DownloadAndStoreTilesAsync(double lat, double lon, double sizeMeters, int zoomLevel, CancellationToken) → Task<List<TileMetadata>>:
1. Queries existing tiles in the region from the repository (filtered to current year's version)
2. Calls ISatelliteDownloader.GetTilesWithMetadataAsync with existing tiles to skip
3. Creates TileEntity for each newly downloaded tile and inserts via repository (upsert)
4. Returns combined list of existing + new tile metadata
GetTileAsync(Guid id) → Task<TileMetadata?>: single tile lookup
GetTilesByRegionAsync(double lat, double lon, double sizeMeters, int zoomLevel) → Task<IEnumerable<TileMetadata>>: query tiles in a region
GetOrDownloadTileAsync(int z, int x, int y, CancellationToken) → Task<TileBytes> (AZ-310): cache → repository → downloader fallback for single Z/X/Y serving
DownloadAndStoreSingleTileAsync(double latitude, double longitude, int zoomLevel, CancellationToken) → Task<TileMetadata> (AZ-311): download one tile by lat/lon, persist, return metadata

Internal Logic

Version is DateTime.UtcNow.Year — tiles are considered fresh for the current calendar year
MapToMetadata(TileEntity) → TileMetadata: entity-to-DTO mapping (static helper)
Tile size hardcoded to 256 pixels, image type "jpg"
MapsVersion formatted as "downloaded_{date}"
IMemoryCache keyed by (z, x, y) with 1h absolute / 30min sliding expiration; populated on first hit and on downloader fallback

Dependencies

ISatelliteDownloader (resolved via DI; concrete is GoogleMapsDownloaderV2)
ITileRepository
IMemoryCache (registered by AddTileDownloader())
SatelliteProvider.Common.DTO — GeoPoint, TileMetadata, TileBytes
SatelliteProvider.DataAccess.Models — TileEntity

Consumers

RegionService.ProcessRegionAsync — downloads and retrieves tiles for a region

Data Models

Transforms between TileEntity (persistence) and TileMetadata (DTO).

Configuration

None directly; relies on GoogleMapsDownloaderV2's configuration.

External Integrations

Indirect: Google Maps (via downloader), PostgreSQL (via repository).

Security

None.

Tests

No dedicated tests.

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