com.spotify.flo

Interface EvalContext.Value<T>

Type Parameters:

T - The enclosed type

Enclosing interface:

EvalContext

public static interface EvalContext.Value<T>

A wrapped value with additional semantics for how the enclosed value becomes available and how computations on that value are executed. Value is a Monad and the implementor should minimally need to implement EvalContext.value(Fn), flatMap(Function) and consume(Consumer) to get a working context with it's associated value type.

Method Summary

Modifier and Type	Method and Description
void	consume(Consumer<T> consumer) Consume the enclosed value.
EvalContext	context() The EvalContext that created this value.
<U> EvalContext.Value<U>	flatMap(Function<? super T,? extends EvalContext.Value<? extends U>> fn) Map the enclosed value through a function that return another EvalContext.Value.
default T	get()
default <U> EvalContext.Value<U>	map(Function<? super T,? extends U> fn) Map the enclosed value through a function and return a EvalContext.Value enclosing that result.
void	onFail(Consumer<Throwable> errorConsumer) Consume any error the occurred while constructing the enclosed value.
default CompletableFuture<T>	toFuture()

Method Detail

context

EvalContext context()

The EvalContext that created this value.

Returns:

The context

consume

void consume(Consumer<T> consumer)

Consume the enclosed value.

Parameters:

consumer - The code that should consume the value

onFail

void onFail(Consumer<Throwable> errorConsumer)

Consume any error the occurred while constructing the enclosed value.

Parameters:

errorConsumer - The code that should consume the error

map

default <U> EvalContext.Value<U> map(Function<? super T,? extends U> fn)

Map the enclosed value through a function and return a EvalContext.Value enclosing that result.

Type Parameters:

U - The type of the new enclosed value

Parameters:

fn - The function to map the enclosed value through

Returns:

A new value with a different type

flatMap

<U> EvalContext.Value<U> flatMap(Function<? super T,? extends EvalContext.Value<? extends U>> fn)

Map the enclosed value through a function that return another EvalContext.Value.

The returned other value could be from a different EvalContext so the implementor of this context should take care of how to bridge the value semantics to the returned value.

Type Parameters:

U - The type of the new enclosed value

Parameters:

fn - The function to map the enclosed value through

Returns:

A new value with a different type

toFuture

default CompletableFuture<T> toFuture()

get

default T get()