[bv-dev] Promote fail fast?

[Gunnar Morling]

Hi Marco,

Thanks for bringing up this proposal. I think it'd be a good addition. Can
you open a BVAL issue for it?

A variation could be to not stop after the first failure but after the
first n, with n being a configurable number. I can't see a compelling use
case for this, though. Usually you just want a quick exit if an object is
invalid, so a binary setting should do it.

@Others, any thoughts from your side?

Cheers,

--Gunnar


2016-08-29 7:38 GMT+02:00 Marco Molteni <moltenma at gmail.com>:

> Hi guys,
>
> What do you think about the 'promotion' of fail-fast (from hibernate
> validator) to the BV API?
>
> I see frequently this 2 use cases (in the 9-5 projects) to support the
> request ;)
>
> 1. batch: there are a lot of batch processes that have to validate the
> input data (flat file -> bean -> validation) and return for each bean only
> a technical error if at least one field is not valid ('input refused').
> When there are millions (e.g. payments transactions) of beans to validate
> in a batch and 30-50 fields for each bean the fail-fast saves a lot of time
> (and the night is never long enough for all the batches required) ;)
>
> 2. REST response: in the validation of REST services often when 2 systems
> exchange data the answer in case of error is an HTTP 4xx without many
> details. The fail-fast is a time and machine resources saving when your
> application is accessed by (hundred of) thousand users through some
> external web client (e.g. JS client).
>
> In the do-it-yourself implementations for the 2 uses cases at the first
> error an IllegalArgumentException is thrown with the information of the
> first error found.
>
> The full test of every field is very well suited for uses cases in which
> there is a human to machine communication (e.g. web forms).
>
> If your opinion is positive I can do more investigations if needed.
>
> Cheers
>
> Marco
>
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