[rules-users] Drools Planner: contraint for rest time between shift

[Geoffrey De Smet]

Op 11-02-13 21:24, fdauffy schreef:
> Hello
> Thanks for your quick answer.
> In fact, I realise that the ShiftDate class doesn't contain directly a date
> field, only a dayindex or the date as string.
> If I want to use your solution, I guess I will have to implement either a
> date or a time field in order to be able to add hours as you suggest.
In the nurseRostering example, there's a shiftIndex, which is uniqueness 
over shiftTypeIndex and shiftDateIndex.
But it doesn't accurately depict time indeed.
In the nurseRostering example, there's also shiftDateIndex together with 
shiftType.startTimeString, but the latter is just a String because there 
was no need to parse it.

So yes, to go the time way, you'll need to alter the domain :)
> I continue to work on the subject and I have another question: do you think
> I should continue on the way you indicated and do the modification in order
> to be able to do some time comparison between shifts, or go in another
> direction with the unwanted pattern (I just discover that this afternoon).
> If I understand well, with the unwanted pattern, I should be able to avoid
> some group of consecutive shifts like late shift followed by early shift..
> This solution looks easier to me but less nice (code to update if new
> shifts,...).
Sounds less nice indeed.
Talk to your business: let them figure out what they want.
The time way seems most business simple, I could imagine a contract 
stating "at least 8 hours rest after a shift".
But maybe they're ok with have an early-shift(6-14) followed by a 
demi-late-shift (18-22), even though there are only 4 hours in between,
so the shift patterns do matter.

Your score function should be what your business wants it to be. But it 
takes a few iterations before they accurately know want they want :)
>
> You really did a great job with Drools Planner!!
>
> Frédéric
>
>
>
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