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>
/// Invokes the specified action if <paramref name="serviceResponse"/>.IsRight.
/// Returns the current <see cref="IServiceResponse{T}" /> instance.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="serviceResponse">The service response.</param>
/// <param name="action">The action to invoke.</param>
/// <returns>The current <see cref="IServiceResponse{T}" /> instance.</returns>
public static IServiceResponse <T> Let <T>(this IServiceResponse <T> serviceResponse, Action <T> action)
{
if (serviceResponse.IsRight)
{
action.Invoke(serviceResponse.GetRight());
}
return(serviceResponse);
}
/// <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="bindingFunction" />.
/// </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="bindingFunction">The binding function.</param>
/// <returns>Instance of <see cref="IServiceResponse{T2}" />.</returns>
public static IServiceResponse <T2> Bind <T, T2>(this IServiceResponse <T> serviceResponse, Func <T, IServiceResponse <T2> > bindingFunction)
{
if (serviceResponse.IsLeft)
{
return(serviceResponse.CreateGenericErrorResponse <T, T2>(serviceResponse.GetLeft()));
}
return(bindingFunction.Invoke(serviceResponse.GetRight()));
}
/// <summary>
/// Returns the value of <typeparamref name="T"/> if there is no error.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="serviceResponse">The service response.</param>
/// <returns><typeparamref name="T"/>.</returns>
/// <exception cref="System.InvalidOperationException">Cannot return right of either when left (errors) exist.</exception>
public static T FromRight <T>(this IServiceResponse <T> serviceResponse)
{
if (!serviceResponse.IsRight)
{
throw new InvalidOperationException("Cannot return right of either when is left.");
}
return(serviceResponse.GetRight());
}
/// <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>
/// If <seealso cref="IServiceResponse{T}.IsLeft" />, 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="bindFunc" />.
/// </summary>
/// <typeparam name="T">The type of the current <see cref="IServiceResponse{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="bindFunc">The binding function.</param>
/// <returns>Instance of <see cref="IServiceResponse{T2}" />.</returns>
public static Task <IServiceResponse <T2> > BindAsync <T, T2>(
this IServiceResponse <T> serviceResponse,
Func <T, Task <IServiceResponse <T2> > > bindFunc)
{
if (serviceResponse.IsLeft)
{
return(Task.FromResult(serviceResponse.CreateGenericErrorResponse <T, T2>(serviceResponse.GetLeft())));
}
return(bindFunc(serviceResponse.GetRight()));
}
/// <summary>
/// Invokes the specified action if <paramref name="serviceResponse"/>.<see cref="IServiceResponse{T}.IsRight" />.
/// Returns the current <paramref name="serviceResponse"/> instance.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="serviceResponse">The service response.</param>
/// <param name="letAction">The let function.</param>
/// <returns>Returns the current <paramref name="serviceResponse"/> instance unless
/// <paramref name="letAction"/> returns a faulted task. <see cref="Task.IsFaulted"/></returns>
public static Task <IServiceResponse <T> > LetAsync <T>(
this IServiceResponse <T> serviceResponse,
Action <T> letAction)
{
if (serviceResponse.IsLeft)
{
return(Task.FromResult(serviceResponse));
}
// TODO: (DG) This can yield unexpected results of the action is an asyncVoid and throws an exception!
letAction(serviceResponse.GetRight());
return(Task.FromResult(serviceResponse));
}
/// <summary>
/// Raises the specified event if <paramref name="onRightOnly" /> is false or the <paramref name="serviceResponse" />.IsRight.
/// Event handlers may be executed in parallel. All handlers are run even if one throws an exception.
/// If an exception is thrown, this method returns a new <see cref="ServiceResponse{T}" /> with an error representing the thrown exceptions.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="TEvent">The type of the T event.</typeparam>
/// <param name="serviceResponse">The service response.</param>
/// <param name="eventManager">The event manager.</param>
/// <param name="eventFactory">The function to create the event.</param>
/// <param name="onRightOnly">Determines whether to raise the event in the case the serviceResponse is left.</param>
/// <returns>Task<IServiceResponse<T>>.</returns>
public static Task <IServiceResponse <T> > RaiseAsync <T, TEvent>(
this IServiceResponse <T> serviceResponse,
IManageEvents eventManager,
Func <T, TEvent> eventFactory,
Boolean onRightOnly = true)
{
if (onRightOnly && serviceResponse.IsLeft)
{
return(Task.FromResult(serviceResponse));
}
var eventParam = serviceResponse.IsRight
? serviceResponse.GetRight()
: default(T);
return(eventManager.Raise(eventFactory(eventParam))
.ContinueWith(task => task.IsFaulted
? new ErrorResponse <T>(task.Exception.ToError())
: serviceResponse,
CancellationToken.None,
TaskContinuationOptions.ExecuteSynchronously,
TaskScheduler.Default));
}
/// <summary>
/// Invokes the specified action if <see cref="IServiceResponse{T}.IsRight" />.
/// Returns the current <paramref name="serviceResponse"/> instance unless <paramref name="letFunc"/>
/// returns a faulted task. <see cref="Task.IsFaulted"/>
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="serviceResponse">The service response.</param>
/// <param name="letFunc">The let function.</param>
/// <returns>Returns the current <paramref name="serviceResponse"/> instance unless
/// <paramref name="letFunc"/> returns a faulted task. <see cref="Task.IsFaulted"/></returns>
public static Task <IServiceResponse <T> > LetAsync <T>(
this IServiceResponse <T> serviceResponse,
Func <T, Task> letFunc)
{
if (serviceResponse.IsLeft)
{
return(Task.FromResult(serviceResponse.CreateGenericErrorResponse(serviceResponse.GetLeft())));
}
return(letFunc(serviceResponse.GetRight())
.ContinueWith(task =>
{
if (task.IsFaulted)
{
return new ErrorResponse <T>(task.Exception.ToError());
}
return serviceResponse;
},
CancellationToken.None,
TaskContinuationOptions.ExecuteSynchronously,
TaskScheduler.Default));
}
