internal static QueryHandlerDelegate <TResult> FromFactory <TQuery, TResult>(Func <IQueryAsyncHandler <TQuery, TResult> > queryHandlerFactory)
where TQuery : class, IQuery <TResult>
{
return(new QueryHandlerDelegate <TResult>(async(inputQuery, ct) =>
{
TQuery query = EnsureValidQuery <TQuery, TResult>(inputQuery);
IQueryAsyncHandler <TQuery, TResult> instance = EnsureInstanceFromFactory(queryHandlerFactory);
return await instance.HandleAsync(query, ct).ConfigureAwait(false);
}));
}
/// <summary>
/// <para>Resolves an instance of IQueryAsyncHandler<TQuery, TResult> from the container</para>
/// <para>and converts it to a query handler delegate which can be invoked to process the query.</para>
/// </summary>
/// <typeparam name="TQuery">Type of query which is handled by the query handler.</typeparam>
/// <typeparam name="TResult">Type of query's result.</typeparam>
/// <returns>Instance of <see cref="QueryHandlerDelegate{TResult}"/> which executes the query handler processing.</returns>
public QueryHandlerDelegate <TResult> ResolveQueryHandler <TQuery, TResult>() where TQuery : class, IQuery <TResult>
{
try
{
IQueryAsyncHandler <TQuery, TResult> queryAsyncHandler = _containerAdapter.Resolve <IQueryAsyncHandler <TQuery, TResult> >();
if (queryAsyncHandler == null)
{
// No handlers are resolved. Throw exception.
throw ExceptionBuilder.NoQueryHandlerResolvedException(typeof(TQuery));
}
return(QueryHandlerDelegateBuilder.FromQueryHandler(queryAsyncHandler));
}
catch (Exception ex)
{
// No handlers are resolved. Throw exception.
throw ExceptionBuilder.NoQueryHandlerResolvedException(typeof(TQuery), ex);
}
}
internal static QueryHandlerDelegate <TResult> FromQueryHandler <TQuery, TResult>(IQueryAsyncHandler <TQuery, TResult> queryAsyncHandler)
where TQuery : class, IQuery <TResult>
{
return(new QueryHandlerDelegate <TResult>(async(inputQuery, ct) =>
{
TQuery query = EnsureValidQuery <TQuery, TResult>(inputQuery);
return await queryAsyncHandler.HandleAsync(query, ct).ConfigureAwait(false);
}));
}
