Example concurrency conflict resolution registry

Concurrency resolver

 public interface IConcurrencyConflictResolver
    {
        bool ConflictsWith(Type eventToCheck, IEnumerable<Type> previousEvents);
        void RegisterConflictList(Type eventDefinition, List<Type> conflictsWith);
    }

    public class ConcurrencyConflictResolver : IConcurrencyConflictResolver
    {
        private readonly Dictionary<Type, List<Type>> _conflictRegister;

        public ConcurrencyConflictResolver()
        {
            _conflictRegister = new Dictionary<Type, List<Type>>();
        }

        public bool ConflictsWith(Type eventToCheck, IEnumerable<Type> previousEvents)
        {
            // If type not registered assume the worst and say it conflicts
            if (!_conflictRegister.ContainsKey(eventToCheck)) return true;

            return previousEvents.Any(previousEvent => _conflictRegister[eventToCheck].Any(et => et == previousEvent));
        }

        public void RegisterConflictList(Type eventDefinition, List<Type> conflictsWith)
        {
            if (!eventDefinition.IsSubclassOf(typeof(Event))) throw new ArgumentException("eventDefinition must be of type Event");
            if (conflictsWith.Any(c => c.IsSubclassOf(typeof(Event)) == false)) throw new ArgumentException("all conflicts with type must be of type Event");
            if (_conflictRegister.ContainsKey(eventDefinition))
                _conflictRegister.Remove(eventDefinition);

            _conflictRegister.Add(eventDefinition, conflictsWith);
        }
    }