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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
We'll verify that employees do not exceed their assigned work percentage. For example, if an employee has a 1% work percentage, they should only be assigned shifts that fit within that limit.
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
@dan1st | Daniel
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
Hmm I am not sure how that'd be done. Any suggestions?
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
@dan1st | Daniel
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
Like why do we subtract 0.0001 from desiredHours?
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
Yeah
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
But why
return totalWorkedHours.toHours() < desiredHours - 0.0001
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
I think return totalWorkedHours.toHours() < desiredHours should be ok
we've tried this but it didn't work
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
Yeah, but do you know what could be the issue instead? Should we do more logging somewhere to see what could be causing the issue along the way?
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
The problem could lie somewhere in the logic here 
public Constraint workPercentage(ConstraintFactory constraintFactory) {
    return constraintFactory.forEach(Employee.class)
            .join(Shift.class, equal(Employee::getName, Shift::getEmployee))
            .groupBy(
                    (employee, shift) -> employee,
                    ConstraintCollectors.sumDuration((employee, shift) -> 
                        Duration.between(shift.getStart(), shift.getEnd()))
                )
            .filter((employee, totalWorkedHours) -> {
                double fullTimeHours = 40.0;
                double desiredHours = employee.getWorkPercentage() * fullTimeHours;
                return totalWorkedHours.toHours() != desiredHours;
            })
            .penalize(HardSoftBigDecimalScore.ONE_HARD, (employee, totalWorkedHours) -> {
                return (int) totalWorkedHours.toHours() - employee.getWorkPercentage() * 40;
            })
            .asConstraint("Employee work percentage not matched");
}
public Constraint workPercentage(ConstraintFactory constraintFactory) {
    return constraintFactory.forEach(Employee.class)
            .join(Shift.class, equal(Employee::getName, Shift::getEmployee))
            .groupBy(
                    (employee, shift) -> employee,
                    ConstraintCollectors.sumDuration((employee, shift) -> 
                        Duration.between(shift.getStart(), shift.getEnd()))
                )
            .filter((employee, totalWorkedHours) -> {
                double fullTimeHours = 40.0;
                double desiredHours = employee.getWorkPercentage() * fullTimeHours;
                return totalWorkedHours.toHours() != desiredHours;
            })
            .penalize(HardSoftBigDecimalScore.ONE_HARD, (employee, totalWorkedHours) -> {
                return (int) totalWorkedHours.toHours() - employee.getWorkPercentage() * 40;
            })
            .asConstraint("Employee work percentage not matched");
}
(from the OP)
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
@dan1st | Daniel But even if we count in minutes instead of hours, shouldn't workpercentage being 0 mean that no shifts are assigned to that particular employee?
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
@ayylmao123xdd so doing this? 
.filter((employee, totalWorkedHours) -> {
    double fullTimeHours = 160; // Assume 40 hours as full-time
    double maxAllowedHours = (employee.getWorkPercentage() * fullTimeHours) / 100;
    double currentShiftHours = Duration.between(shift.getStart(), shift.getEnd()).toHours();
    return (totalWorkedHours + currentShiftHours) <= maxAllowedHours && employee.getWorkPercentage() > 0;
})
.filter((employee, totalWorkedHours) -> {
    double fullTimeHours = 160; // Assume 40 hours as full-time
    double maxAllowedHours = (employee.getWorkPercentage() * fullTimeHours) / 100;
    double currentShiftHours = Duration.between(shift.getStart(), shift.getEnd()).toHours();
    return (totalWorkedHours + currentShiftHours) <= maxAllowedHours && employee.getWorkPercentage() > 0;
})
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
@dan1st | Daniel
154 replies
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
@dan1st | Daniel
154 replies
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
The code is using a library called Timefold Solver, which is a constraint solver. It is used for solving planning and scheduling problems by defining constraints and optimizing solutions based on those constraints. The constraints are defined in our EmployeeSchedulingConstraintProvider class, using the Timefold Solver's API, which includes classes like ConstraintFactory, ConstraintCollectors, and HardSoftBigDecimalScore. These are used to define and manage constraints for employee scheduling, such as ensuring no overlapping shifts, respecting employee preferences, and balancing shift assignments.
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
My friend will enter the conversation, we're working together @dan1st | Daniel, he can explain better 😄
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
No description
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
@dan1st | Daniel still Alice assigned to one, when their work percentage is 0: 
"shifts": [
        {
            "id": "2027-02-01-night1",
            "start": "2025-02-01T07:00:00",
            "end": "2025-02-01T10:00:00",
            "location": "Hospital",
            "requiredSkill": "Nursing",
            "shiftType": "MORNING",
            "employee": {
                "name": "Alice",
                "skills": [
                    "Nursing",
                    "CPR"
                ],
                "unavailableDates": [],
                "undesiredDates": [],
                "desiredDates": [],
                "shiftPreferences": [
                    "NIGHT",
                    "MORNING"
                ],
                "workPercentage": 0
            }
        },
"shifts": [
        {
            "id": "2027-02-01-night1",
            "start": "2025-02-01T07:00:00",
            "end": "2025-02-01T10:00:00",
            "location": "Hospital",
            "requiredSkill": "Nursing",
            "shiftType": "MORNING",
            "employee": {
                "name": "Alice",
                "skills": [
                    "Nursing",
                    "CPR"
                ],
                "unavailableDates": [],
                "undesiredDates": [],
                "desiredDates": [],
                "shiftPreferences": [
                    "NIGHT",
                    "MORNING"
                ],
                "workPercentage": 0
            }
        },
Both should've been assigned to Bob
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
And this is the reworked code 
.filter((employee, totalWorkedHours) -> {
    double fullTimeHours = 160; // Assume 40 hours as full-time
    double maxAllowedHours = (employee.getWorkPercentage() * fullTimeHours) / 100;
    return totalWorkedHours <= maxAllowedHours && employee.getWorkPercentage() > 0; // The changed correct logic
})
.filter((employee, totalWorkedHours) -> {
    double fullTimeHours = 160; // Assume 40 hours as full-time
    double maxAllowedHours = (employee.getWorkPercentage() * fullTimeHours) / 100;
    return totalWorkedHours <= maxAllowedHours && employee.getWorkPercentage() > 0; // The changed correct logic
})
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Created by dghf on 3/19/2025 in #java-help
Issues with Contract Work Percentage Constraint in Employee Scheduling
I got this from doing PUT
154 replies