Result.java

public final class Result<S, F> {

    private final Optional<S> success;
    private final Optional<F> failure;

    public Result(Optional<S> success, Optional<F> failure) {
        this.success = success;
        this.failure = failure;
    }

    public static  <S, F> Result<S, F> success(S success) {
        return new Result<>(Optional.of(success), Optional.empty());
    }

    public static  <S, F> Result<S, F> failure(F failure) {
        return new Result<>(Optional.empty(), Optional.of(failure));
    }

    public Optional<S> getSuccess() {
        return success;
    }

    public Optional<F> getFailure() {
        return failure;
    }

    public Result<S, F> onSuccess(Consumer<S> consumer) {
        success.ifPresent(consumer);
        return this;
    }

    public Result<S, F> onFailure(Consumer<F> consumer) {
        failure.ifPresent(consumer);
        return this;
    }

}