public static async Task <IServiceResponse <IEnumerable <T2> > > BindManyAsync <T, T2>(
this IServiceResponse <IEnumerable <T> > serviceResponse,
Func <T, Task <IServiceResponse <T2> > > bindFunc)
{
if (serviceResponse.IsLeft)
{
return(serviceResponse.CreateGenericErrorResponse <IEnumerable <T>, IEnumerable <T2> >(serviceResponse.GetLeft()));
}
var result = new List <T2>();
foreach (var element in serviceResponse.GetRight())
{
var elementResponse = await bindFunc(element);
if (elementResponse.IsLeft)
{
return(serviceResponse.CreateGenericErrorResponse <IEnumerable <T>, IEnumerable <T2> >(elementResponse.GetLeft()));
}
result.Add(elementResponse.GetRight());
}
return(serviceResponse.CreateGenericDataResponse(result));
}
/// <summary>
/// If <paramref name="serviceResponse"/>.IsLeft, returns a new <see cref="IServiceResponse{T2}" /> instance with the current
/// <paramref name="serviceResponse"/>.Error. Otherwise, it binds the <paramref name="serviceResponse"/>.Data into
/// the specified <paramref name="mappingFunction" />.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="T2">The type of the next <see cref="IServiceResponse{T2}" /> to return.</typeparam>
/// <param name="serviceResponse">The service response.</param>
/// <param name="mappingFunction">The mapping function.</param>
/// <returns>Instance of <see cref="IServiceResponse{T2}" />.</returns>
public static IServiceResponse <T2> Fmap <T, T2>(this IServiceResponse <T> serviceResponse, Func <T, T2> mappingFunction)
{
if (serviceResponse.IsLeft)
{
return(serviceResponse.CreateGenericErrorResponse <T, T2>(serviceResponse.GetLeft()));
}
T2 result = mappingFunction.Invoke(serviceResponse.GetRight());
return(serviceResponse.CreateGenericDataResponse(result));
}
/// <summary>
/// Invokes the specified function if <seealso cref="IServiceResponse{T}.Error" /> is not null. Allows you to re-direct control flow with a new <typeparamref name="T" /> value.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="serviceResponse">The service response.</param>
/// <param name="continueWithFunction">The continue with function.</param>
/// <returns>If errors exist, returns the instance of IServiceResponse{T} returned by <paramref name="continueWithFunction" />, else returns current instance.</returns>
public static IServiceResponse <T> CatchAndContinue <T>(this IServiceResponse <T> serviceResponse, Func <Error, T> continueWithFunction)
{
if (serviceResponse.Error != null)
{
T result = continueWithFunction.Invoke(serviceResponse.Error);
return(serviceResponse.CreateGenericDataResponse <T>(result));
}
return(serviceResponse);
}
/// <summary>
/// If <seealso cref="IServiceResponse{T}.Error" /> is not null, returns a new <see cref="IServiceResponse{T2}" /> instance with the current
/// <seealso cref="IServiceResponse{T}.Error" />. Else, binds the <seealso cref="IServiceResponse{T}.Data" /> into the specified <paramref name="mappingFunction" />.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="T2">The type of the next <see cref="IServiceResponse{T2}" /> to return.</typeparam>
/// <param name="serviceResponse">The service response.</param>
/// <param name="mappingFunction">The mapping function.</param>
/// <returns>Instance of <see cref="IServiceResponse{T2}" />.</returns>
public static IServiceResponse <T2> Fmap <T, T2>(this IServiceResponse <T> serviceResponse, Func <T, T2> mappingFunction)
{
if (serviceResponse.Error != null)
{
return(serviceResponse.CreateGenericErrorResponse <T, T2>(serviceResponse.Error));
}
T2 result = mappingFunction.Invoke(serviceResponse.Data);
return(serviceResponse.CreateGenericDataResponse(result));
}
/// <summary>
/// Invokes the specified function if <see cref="IServiceResponse{T}.Error"/> is not null. Allows you to re-direct control flow with a new <typeparamref name="T" /> value.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="serviceResponse">The service response.</param>
/// <param name="continueWithFunction">The continue with function.</param>
/// <returns>If errors exist, returns the instance of IServiceResponse{T} returned by <paramref name="continueWithFunction" />, else returns current instance.</returns>
public static Task <IServiceResponse <T> > CatchAndContinueAsync <T>(
this IServiceResponse <T> serviceResponse,
Func <Error, T> continueWithFunction)
{
var tcs = new TaskCompletionSource <IServiceResponse <T> >();
if (serviceResponse.Error != null)
{
T result = continueWithFunction.Invoke(serviceResponse.Error);
tcs.SetResult(serviceResponse.CreateGenericDataResponse <T>(result));
}
else
{
tcs.SetResult(serviceResponse);
}
return(tcs.Task);
}
/// <summary>
/// Invokes the specified action if <see cref="IServiceResponse{T}.Error" /> is null.
/// Returns the current <see cref="IServiceResponse{T}" /> instance unless the task
/// from <paramref name="letFunc"/> <see cref="Task.IsFaulted"/>.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="serviceResponse">The service response.</param>
/// <param name="letFunc">The let function.</param>
/// <returns>Task<IServiceResponse<T>>.</returns>
public static Task <IServiceResponse <T> > LetAsync <T>(
this IServiceResponse <T> serviceResponse,
Func <T, Task> letFunc)
{
if (serviceResponse.Error != null)
{
return(Task.FromResult(serviceResponse.CreateGenericErrorResponse(serviceResponse.Error)));
}
return(letFunc(serviceResponse.Data)
.ContinueWith(task =>
{
if (task.IsFaulted)
{
return serviceResponse.CreateGenericErrorResponse(task.Exception.ToError());
}
return serviceResponse.CreateGenericDataResponse <T>(serviceResponse.Data);
}));
}