public void ShouldReturnZeroWhenEventStoreIsEmpty()
{
// Clear the event list.
eventStore.Events = Enumerable.Empty <IEvent>();
var query = new CalculationResultQuery();
var result = queryHandler.ExecuteQuery(query);
Assert.AreEqual(0, result);
}
public TResult ExecuteQuery<TQuery, TResult>(TQuery query)
where TResult : IQueryResult
where TQuery : IQuery
{
IQueryHandler<TQuery, TResult> handler = null;
var resolvedHandlers = _container.GetAllInstances<IQueryHandler<TQuery, TResult>>();
var queryHandlers = resolvedHandlers as IQueryHandler<TQuery, TResult>[] ?? resolvedHandlers.ToArray();
if (!queryHandlers.Any())
{
throw new Exception($"Unable to resolve a query handler for type {query.GetType()}.");
}
if (queryHandlers.Count() > 1)
{
throw new Exception($"Ambiguous call to handler for type {query.GetType()}. There are more than one handler registered to the same type.");
}
handler = queryHandlers.First();
return handler.ExecuteQuery(query);
}