public IQueryResult <T> InvokeQuery <T>(IQuery query)
{
try
{
var handler = queryHandlerFactory.GetHandler(query);
var sendingMethod = handler.GetType().GetRuntimeMethods().FirstOrDefault(m => m.Name == "Handle");
T result;
if (sendingMethod != null)
{
result = (T)sendingMethod.Invoke(handler, new object[] { query });
return(new QueryResult <T>()
{
Data = result, QueryStatus = ActionStatus.Success
});
}
throw new Exception($"Handle method not found on {handler.ToString()} object");
}
catch (TargetInvocationException ex)
{
throw ex.InnerException;
}
catch (Exception)
{
throw;
}
}
public TResult Query <TResult>(IQuery <TResult> query)
{
var handler = _queryHandlerFactory.GetHandler(query);
if (handler == null)
{
throw new InvalidOperationException($"Query `{query.GetType().FullName}` handler not found.");
}
return(handler.Handle(query));
}
private IQueryHandler GetHandler <TResult>(IQuery <TResult> query)
where TResult : class
{
Contract.Requires(query != null);
Contract.Ensures(Contract.Result <IQueryHandler>() != null);
try
{
// get handler from factory
return(_handlerFactory.GetHandler(query.GetType()));
}
catch (Exception e)
{
// rethrow exception has a query handling exception
throw new QueryHandlingException(query, e, "Could not get a query handler for query.");
}
}
public void CanGetHandlerForRegisteredQuery()
{
Assert.IsNotNull(_factory.GetHandler(typeof(Query1)));
}