BuildingBlocks.Specification

public abstract class CompositeSpecification<T>
    : Ardalis.Specification.Specification<T>, IInMemorySpecification<T>
{
    public abstract override bool IsSatisfiedBy(T candidate);

    public IInMemorySpecification<T> And(IInMemorySpecification<T> other);
    public IInMemorySpecification<T> AndNot(IInMemorySpecification<T> other);
    public IInMemorySpecification<T> Or(IInMemorySpecification<T> other);
    public IInMemorySpecification<T> OrNot(IInMemorySpecification<T> other);
    public IInMemorySpecification<T> Not();
}

public sealed class GetActiveFaqsSpecification : CompositeSpecification<Faq>
{
    public GetActiveFaqsSpecification(Guid? tenantId)
    {
        Query
            .Where(f => f.IsActive)
            .OrderBy(f => f.Order)
            .EnableCache(nameof(GetActiveFaqsSpecification), tenantId ?? Guid.Empty)
            .WithCacheTtl(TimeSpan.FromMinutes(10))
            .WithTags("faq", $"tenant:{tenantId}");
    }

    // In-memory değerlendirme (ör. domain event sonrası filtre)
    public override bool IsSatisfiedBy(Faq candidate) => candidate.IsActive;
}

// Read repository (CachedRepository decorator) ile — sonuç cache'lenir
var spec = new GetActiveFaqsSpecification(tenantId);
IReadOnlyList<Faq> faqs = await _readRepository.ListAsync(spec, ct);

// Aggregate değiştiğinde aynı tag düşürülür (domain event handler içinde)
await _cache.RemoveByTagAsync("faq", ct);

// In-memory kombinasyon — DB'ye gitmeden iki kuralı birleştir
IInMemorySpecification<User> activeAndVerified =
    new ActiveUserSpec().And(new PhoneVerifiedSpec());

bool ok = ((CompositeSpecification<User>)activeAndVerified).IsSatisfiedBy(user);