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Changelog

All notable changes to Vali-Mediator and its extension packages are documented here.

The format follows Keep a Changelog and this project adheres to Semantic Versioning.

Vali-Mediator.Resilience v1.2.2​

Released on 2026-04-20

Fixed​

  • ResilienceBehavior policy caching — the resolved ResiliencePolicy is now cached per request type using a static field (one slot per TRequest+TResponse combination). This covers both AddResiliencePolicy<T> lambdas and class-based IResiliencePolicyProvider<T> providers. Previously GetPolicy() was called on every request, causing stateful policies (Circuit Breaker, Rate Limiter, Bulkhead, Hedge) to lose their accumulated state regardless of how the provider was registered.

Vali-Mediator.Resilience v1.2.1​

Released on 2026-04-20

Fixed​

  • AddResiliencePolicy<T> policy caching — the ResiliencePolicy built by the inline lambda is now constructed once on the first request and cached for the lifetime of the application. Previously the factory was invoked on every call, which caused stateful policies (Circuit Breaker, Rate Limiter, Bulkhead, Hedge) to lose their accumulated state between requests. Behavior now matches a class-based IResiliencePolicyProvider<T> registered as singleton.

Vali-Mediator.Resilience v1.2.0​

Released on 2026-04-20

Added​

  • IResiliencePolicyProvider<TRequest> — new interface for declaring resilience policies in a separate class registered in DI, keeping policy configuration out of the command/query model.
  • services.AddResiliencePolicy<TRequest>(factory) — inline lambda registration, no class needed for the majority of cases.
  • services.AddResiliencePolicyProvider<TRequest, TProvider>() — class-based registration for providers that need injected dependencies (IOptions, ILogger, etc.).
  • IGlobalResiliencePolicyProvider — fallback policy applied to every request that has no specific provider registered.
  • services.AddGlobalResiliencePolicy(policy) — register a fixed global policy.
  • services.AddGlobalResiliencePolicy(factory) — register a global policy factory that receives the request instance.
  • RateLimiterOptions.PartitionKeyResolver — Func<object, string> that enables per-partition rate limiting (e.g. per user ID or IP).

Changed​

  • ResilienceBehavior<TRequest,TResponse> policy resolution order: IResiliencePolicyProvider<TRequest> → IResilient (deprecated) → IGlobalResiliencePolicyProvider.

Deprecated​

  • IResilient — marked [Obsolete]. Use services.AddResiliencePolicy<TRequest>() instead. The interface remains functional for backward compatibility.

Extension Packages v1.1.0​

Released on 2026-04-20

Applies to: Vali-Mediator.Resilience, Vali-Mediator.Caching, Vali-Mediator.Observability, Vali-Mediator.Idempotency, Vali-Mediator.AspNetCore

Changed​

  • All extension packages now reference Vali-Mediator as a NuGet PackageReference instead of a local ProjectReference.

Vali-Mediator v2.0.0​

Added​

  • Result<T> / Result — readonly struct result pattern with Ok/Fail factories, Map, Bind, MapAsync, BindAsync, Tap, OnFailure, Match functional operators, and structured validation errors (IReadOnlyDictionary<string, IReadOnlyList<string>>).
  • ErrorType enum — None, Validation, NotFound, Conflict, Unauthorized, Forbidden, Failure.
  • IRequest / IRequestHandler<TRequest> — shorthand for void-returning handlers via Unit.
  • PublishStrategy.Parallel — concurrent notification dispatch via Task.WhenAll.
  • PublishStrategy.ResilientParallel — all handlers run even if some fail; failures captured by IDeadLetterQueue.
  • SendOrDefault<TResponse> — returns default when no handler is registered.
  • SendAll<T> — dispatches multiple requests concurrently via Task.WhenAll.
  • IStreamRequest<T> / IStreamRequestHandler<TRequest,TResponse> — streaming via IAsyncEnumerable<T>.
  • IHasTimeout — declarative per-request timeout with services.AddTimeoutBehavior().
  • INotificationFilter<TNotification> — per-handler conditional execution via ShouldHandle().
  • IDeadLetterQueue / services.AddInMemoryDeadLetterQueue() — captures failures from ResilientParallel.
  • HandlerNotFoundException — typed exception inheriting ValiMediatorException.
  • ServiceLifetime override — per-assembly lifetime control in RegisterServicesFromAssembly.
  • Auto-discovery — pre/post processors discovered automatically from assembly scan.

Changed​

  • IPreProcessor / IPostProcessor .Process() changed from void to Task (breaking).
  • INotificationHandler.Priority now has a default implementation => 0.
  • Behaviors pipeline: first registered = outermost (uses Enumerable.Reverse before building chain).