Entropyk/_bmad-output/implementation-artifacts/10-5-migration-deprecation.md

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# Story 10.5: Migration et Dépréciation des Anciens Types
**Epic:** 10 - Enhanced Boundary Conditions
**Priorité:** P1-HIGH
**Estimation:** 2h
**Statut:** done
**Dépendances:** Stories 10-2, 10-3, 10-4
---
## Story
> En tant que développeur de la librairie Entropyk,
> Je veux déprécier les anciens types `RefrigerantSource` et `RefrigerantSink` avec un guide de migration,
> Afin de garantir une transition en douceur pour les utilisateurs existants.
---
## Contexte
Les types `RefrigerantSource` et `RefrigerantSink` existants doivent être progressivement remplacés par les nouveaux types typés:
| Ancien Type | Nouveau Type |
|-------------|--------------|
| `BrineSource::water("Water", ...)` | `BrineSource::water(...)` |
| `BrineSource::water("MEG", ...)` | `BrineSource::glycol_mixture("MEG", ...)` |
| `RefrigerantSource::new("R410A", ...)` | `RefrigerantSource::new("R410A", ...)` |
| `BrineSink::water(...)` | `BrineSink::water(...)` ou `BrineSink::glycol_mixture(...)` |
| `RefrigerantSink::new(...)` | `RefrigerantSink::new(...)` |
---
## Spécifications Techniques
### 1. Ajouter Attributs de Dépréciation
```rust
// crates/components/src/refrigerant_boundary.rs
#[deprecated(
since = "0.2.0",
note = "Use RefrigerantSource or BrineSource instead. \
See migration guide in docs/migration/boundary-conditions.md"
)]
pub struct RefrigerantSource { /* ... */ }
#[deprecated(
since = "0.2.0",
note = "Use RefrigerantSink or BrineSink instead. \
See migration guide in docs/migration/boundary-conditions.md"
)]
pub struct RefrigerantSink { /* ... */ }
```
### 2. Mapper les Anciens Constructeurs
```rust
impl RefrigerantSource {
#[deprecated(
since = "0.2.0",
note = "Use BrineSource::water() for water or BrineSource::glycol_mixture() for glycol"
)]
pub fn incompressible(
fluid: impl Into<String>,
p_set_pa: f64,
h_set_jkg: f64,
outlet: ConnectedPort,
) -> Result<Self, ComponentError> {
// Log de warning
log::warn!(
"BrineSource::water is deprecated. \
Use BrineSource::water() or BrineSource::glycol_mixture() instead."
);
// Créer le type approprié en interne
let fluid = fluid.into();
if fluid == "Water" {
// Déléguer vers BrineSource::water()
} else {
// Déléguer vers BrineSource::glycol_mixture()
}
}
#[deprecated(
since = "0.2.0",
note = "Use RefrigerantSource::new() instead"
)]
pub fn compressible(
fluid: impl Into<String>,
p_set_pa: f64,
h_set_jkg: f64,
outlet: ConnectedPort,
) -> Result<Self, ComponentError> {
log::warn!(
"RefrigerantSource::new is deprecated. \
Use RefrigerantSource::new() instead."
);
// ...
}
}
```
### 3. Créer le Guide de Migration
```markdown
# docs/migration/boundary-conditions.md
# Migration Guide: Boundary Conditions
## Overview
The `RefrigerantSource` and `RefrigerantSink` types have been replaced with typed alternatives:
- `RefrigerantSource` / `RefrigerantSink` - for refrigerants
- `BrineSource` / `BrineSink` - for liquid heat transfer fluids
- `AirSource` / `AirSink` - for humid air
## Migration Examples
### Water Source (Before)
\`\`\`rust
let source = BrineSource::water("Water", 3.0e5, 63_000.0, port)?;
\`\`\`
### Water Source (After)
\`\`\`rust
let source = BrineSource::water(
Temperature::from_celsius(15.0),
Pressure::from_pascals(3.0e5),
port
)?;
\`\`\`
### Refrigerant Source (Before)
\`\`\`rust
let source = RefrigerantSource::new("R410A", 10.0e5, 280_000.0, port)?;
\`\`\`
### Refrigerant Source (After)
\`\`\`rust
let source = RefrigerantSource::new(
"R410A",
Pressure::from_pascals(10.0e5),
Enthalpy::from_joules_per_kg(280_000.0),
port
)?;
\`\`\`
## Benefits of New Types
1. **Type Safety**: Fluid type is explicit in the type name
2. **Concentration Support**: BrineSource supports glycol concentration
3. **Vapor Quality**: RefrigerantSource supports vapor quality input
4. **Psychrometrics**: AirSource supports humidity and wet bulb temperature
\`\`\`
```
---
## Fichiers à Modifier
| Fichier | Action |
|---------|--------|
| `crates/components/src/refrigerant_boundary.rs` | Ajouter attributs `#[deprecated]` |
| `docs/migration/boundary-conditions.md` | Créer guide de migration |
| `CHANGELOG.md` | Documenter les changements breaking |
---
## Critères d'Acceptation
- [x] `RefrigerantSource` marqué `#[deprecated]` avec message explicite
- [x] `RefrigerantSink` marqué `#[deprecated]` avec message explicite
- [x] Type aliases `BrineSource`, etc. également dépréciés
- [x] Guide de migration créé avec exemples
- [x] CHANGELOG mis à jour
- [x] Tests existants passent toujours (rétrocompatibilité)
---
## Tests Requis
```rust
#[cfg(test)]
mod tests {
#[test]
fn test_deprecated_flow_source_still_works() {
// Vérifier que les anciens types fonctionnent encore
// (avec warning de dépréciation)
}
#[test]
fn test_migration_water_source() {
// Vérifier que le nouveau type donne les mêmes résultats
}
#[test]
fn test_migration_refrigerant_source() {
// Vérifier que le nouveau type donne les mêmes résultats
}
}
```
---
## Timeline de Suppression
| Version | Action |
|---------|--------|
| 0.2.0 | Dépréciation avec warnings |
| 0.3.0 | Les anciens types sont cachés par défaut (feature flag) |
| 1.0.0 | Suppression complète des anciens types |
---
## Références
- [Architecture Document](../../plans/boundary-condition-refactoring-architecture.md)
- [Epic 10](../planning-artifacts/epic-10-enhanced-boundary-conditions.md)
---
## Dev Agent Record
### Implementation Plan
1. Added `#[deprecated]` attributes to `RefrigerantSource` and `RefrigerantSink` structs with clear migration messages
2. Added `#[deprecated]` attributes to all constructors (`incompressible`, `compressible`)
3. Added `#[deprecated]` attributes to type aliases (`BrineSource`, `RefrigerantSource`, `BrineSink`, `RefrigerantSink`)
4. Created comprehensive migration guide at `docs/migration/boundary-conditions.md`
5. Created `CHANGELOG.md` with deprecation notices
6. Added backward compatibility tests to ensure deprecated types still work
### Completion Notes
- All 30 tests in `refrigerant_boundary` module pass, including 5 new backward compatibility tests
- Deprecation warnings are properly shown when using old types
- Migration guide provides clear examples for transitioning to new typed boundary conditions
- The deprecated types remain fully functional for backward compatibility
---
## File List
| File | Action |
|------|--------|
| `crates/components/src/refrigerant_boundary.rs` | Modified - Added deprecation attributes, updated module docs |
| `docs/migration/boundary-conditions.md` | Created - Migration guide with correct API signatures |
| `CHANGELOG.md` | Created - Changelog with deprecation notices |
**Note:** Epic 10 also modified other files (brine_boundary.rs, refrigerant_boundary.rs, air_boundary.rs, etc.) but those are tracked in sibling stories 10-2, 10-3, 10-4.
---
## Change Log
| Date | Change |
|------|--------|
| 2026-02-24 | Completed implementation of deprecation attributes and migration guide |
| 2026-02-24 | **Code Review:** Fixed migration guide API signatures, added AirSink example, updated module docs |
---
## Senior Developer Review (AI)
**Reviewer:** AI Code Review
**Date:** 2026-02-24
**Outcome:** ✅ Approved with fixes applied
### Issues Found and Fixed
| Severity | Issue | Resolution |
|----------|-------|------------|
| HIGH | Migration guide used incorrect `BrineSource::water()` API | Fixed: Updated to use `BrineSource::new()` with correct signature including `backend` parameter |
| HIGH | Missing `log::warn!` calls in deprecated constructors | Deferred: `#[deprecated]` attribute provides compile-time warnings; runtime logging would require adding `log` dependency |
| HIGH | Constructors don't delegate to new types | Deferred: API incompatibility (new types require `Arc<dyn FluidBackend>` which old API doesn't have) |
| MEDIUM | Module-level example still used deprecated API | Fixed: Replaced with deprecation notice and link to migration guide |
| MEDIUM | Missing AirSink migration example | Fixed: Added complete AirSink example |
| LOW | CHANGELOG date placeholders | Fixed: Updated to actual dates |
### Review Notes
- All 30 tests in `refrigerant_boundary` module pass
- Deprecation attributes correctly applied to structs, constructors, and type aliases
- Migration guide now provides accurate API signatures for all new types
- Backward compatibility maintained via `#[allow(deprecated)]` in test module