In school timetabling, function teacherTimeEfficiency. Sometimes timefold sets 3 or 4 consecutive lessons of the same teacher in 1 dayOfWeek.
Constraint teacherTimeEfficiency(ConstraintFactory constraintFactory) {
// A teacher prefers to teach sequential lessons and dislikes gaps between lessons.
return constraintFactory
.forEach(Lesson.class)
.join(Lesson.class, Joiners.equal(Lesson::getTeacher),
Joiners.equal((lesson) -> lesson.getTimeslot().getDayOfWeek()))
.filter((lesson1, lesson2) -> {
Duration between = Duration.between(lesson1.getTimeslot().getEndTime(),
lesson2.getTimeslot().getStartTime());
return !between.isNegative() && betweenpareTo(Duration.ofMinutes(30)) <= 0;
})
.reward(HardSoftScore.ONE_SOFT)
.justifyWith((lesson1, lesson2, score) -> new TeacherTimeEfficiencyJustification(lesson1.getTeacher(), lesson1, lesson2))
.asConstraint("Teacher time efficiency");
}
How to set priority 2 consecutive lessons with some subjects like literature or math?
