Infrastructure – InMemory (ServiceDeskLite.Infrastructure.InMemory)

InMemoryStore – Singleton

internal sealed class InMemoryStore
{
    private readonly ConcurrentDictionary<TicketId, Ticket> _tickets = new();

    public bool TryGetTicket(TicketId id, out Ticket? ticket)
    public bool ContainsTicket(TicketId id)
    public IReadOnlyCollection<Ticket> SnapshotTickets()
    public void ApplyAdds(IEnumerable<Ticket> adds)   // Throws on duplicate
}

Data persists for the application lifetime. Shared across all scoped requests.

InMemoryUnitOfWork – Scoped

internal sealed class InMemoryUnitOfWork : IUnitOfWork
{
    internal List<object> PendingAdds { get; } = [];

    public Task SaveChangesAsync(CancellationToken ct = default)
    {
        var ticketAdds = PendingAdds.OfType<Ticket>().ToArray();
        if (ticketAdds.Length > 0) _store.ApplyAdds(ticketAdds);
        PendingAdds.Clear();
    }
}

InMemoryTicketRepository – Scoped

• AddAsync → appends to unitOfWork.PendingAdds
• GetByIdAsync / ExistsAsync → synchronous lookup on InMemoryStore
• SearchAsync → LINQ in-memory with same filter/sort logic; tie-breaker: .ThenBy(t => t.Id.Value)

Component Relationships

Unit of Work Commit Boundary

The two-phase write (buffer → commit) prevents partially visible state within a request scope.

DI Lifetime Summary

Type	Lifetime	Reason
InMemoryStore	Singleton	Shared in-process state
InMemoryUnitOfWork	Scoped	Per-request change set
InMemoryTicketRepository	Scoped	References scoped UoW
EfTicketRepository	Scoped	DbContext is Scoped
EfUnitOfWork	Scoped	DbContext is Scoped
Use-case handlers	Scoped	Reference Scoped repositories