6:12 a.m.
Hello,
I'm starting a project regarding shift planning and while trying Drools
Planner, I notice that in your documentation that somes contraints are given
as example like rest time between shift.
But in all the examples, I couldn't find any constraint like that.
Does anybody already work on such constraint?
Many thanks
Frédéric
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8:10 a.m.
Op 11-02-13 13:12, fdauffy schreef:
Hello,
I'm starting a project regarding shift planning and while trying Drools
Planner, I notice that in your documentation that somes contraints are given
as example like rest time between shift.
But in all the examples, I couldn't find any constraint like that.
Does anybody already work on such constraint?
Many thanks
Frédéric
Shouldn't be hard, something like this:
rule "todo"
when
$left : ShiftAssignment(
$employee : employee, employee != null,
$leftShiftEnd : shiftEnd
)
$right : ShiftAssignment(
employee == $employee,
shiftStart > $leftShiftEnd,
shiftStart < $leftShiftEnd + employee.minimumRestTime,
$rightShiftStart : shiftStart
)
not ShiftAssignment(
employee == $employee,
shiftStart > $leftShiftEnd,
shiftStart < $rightShiftStart
)
then
insertLogical(..., $leftShiftEnd + employee.minimumRestTime -
$rightShiftStart, $left, $right));
end
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2:24 p.m.
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.
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,...).
You really did a great job with Drools Planner!!
Frédéric
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2:20 a.m.
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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7:07 a.m.
Hello
I worked on adding a shift date start and a shift date time. I did it in
Shift.java file, I think that's the right place.
Then in EmployeePanel.java, I calculate the value for these two fields (I
think there is no way to assign them directly with a link between Shiftype
and Shift.
Then I tried to write the new constraint in the drl file: Apparently, I have
to change the default time format in order to access to the time parameters:
I couldn't find clearly how doing that modification. Could you tell me how
doing it
I'm using Netbeans 7.2.1 to run my project: is there a way to run the rule
part in debug mode? (environmentmode?) That would help me a lot as I'm a
beginner in DRL language.
Could you tell me also where I could find more documentation about DRL
language? I just found that for the moment:
http://docs.jboss.org/drools/release/5.5.0.Final/drools-expert-docs/html_...
(any books,..)
Many Thanks
Frédéric
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4:01 p.m.
Hello
I could finally solve my problem in the drl file.
If anybody is interested by my solution, just ask for it.
Frédéric
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1:50 a.m.
It would be interesting to have the solution in the mail archive in this
thread :)
Op 15-02-13 23:01, fdauffy schreef:
Hello
I could finally solve my problem in the drl file.
If anybody is interested by my solution, just ask for it.
Frédéric
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2:16 a.m.
please forward me the soln
thanks
rohit
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