technology/java-spring-boot/src/main/java/org/acme/schooltimetabling/solver/TimeTableConstraintProvider.java [88:103]:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    Constraint studentGroupSubjectVariety(ConstraintFactory constraintFactory) {
        // A student group dislikes sequential lessons on the same subject.
        return constraintFactory
                .forEach(Lesson.class)
                .join(Lesson.class,
                        Joiners.equal(Lesson::getSubject),
                        Joiners.equal(Lesson::getStudentGroup),
                        Joiners.equal((lesson) -> lesson.getTimeslot().getDayOfWeek()))
                .filter((lesson1, lesson2) -> {
                    Duration between = Duration.between(lesson1.getTimeslot().getEndTime(),
                            lesson2.getTimeslot().getStartTime());
                    return !between.isNegative() && between.compareTo(Duration.ofMinutes(30)) <= 0;
                })
                .penalize(HardSoftScore.ONE_SOFT)
                .asConstraint("Student group subject variety");
    }
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -



technology/kubernetes/common/src/main/java/org/acme/common/solver/TimeTableConstraintProvider.java [87:102]:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    Constraint studentGroupSubjectVariety(ConstraintFactory constraintFactory) {
        // A student group dislikes sequential lessons on the same subject.
        return constraintFactory
                .forEach(Lesson.class)
                .join(Lesson.class,
                        Joiners.equal(Lesson::getSubject),
                        Joiners.equal(Lesson::getStudentGroup),
                        Joiners.equal((lesson) -> lesson.getTimeslot().getDayOfWeek()))
                .filter((lesson1, lesson2) -> {
                    Duration between = Duration.between(lesson1.getTimeslot().getEndTime(),
                            lesson2.getTimeslot().getStartTime());
                    return !between.isNegative() && between.compareTo(Duration.ofMinutes(30)) <= 0;
                })
                .penalize(HardSoftScore.ONE_SOFT)
                .asConstraint("Student group subject variety");
    }
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -



technology/java-activemq-quarkus/solver/src/main/java/org/acme/schooltimetabling/solver/TimeTableConstraintProvider.java [87:102]:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    Constraint studentGroupSubjectVariety(ConstraintFactory constraintFactory) {
        // A student group dislikes sequential lessons on the same subject.
        return constraintFactory
                .forEach(Lesson.class)
                .join(Lesson.class,
                        Joiners.equal(Lesson::getSubject),
                        Joiners.equal(Lesson::getStudentGroup),
                        Joiners.equal((lesson) -> lesson.getTimeslot().getDayOfWeek()))
                .filter((lesson1, lesson2) -> {
                    Duration between = Duration.between(lesson1.getTimeslot().getEndTime(),
                            lesson2.getTimeslot().getStartTime());
                    return !between.isNegative() && between.compareTo(Duration.ofMinutes(30)) <= 0;
                })
                .penalize(HardSoftScore.ONE_SOFT)
                .asConstraint("Student group subject variety");
    }
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -



use-cases/school-timetabling/src/main/java/org/acme/schooltimetabling/solver/TimeTableConstraintProvider.java [87:102]:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    Constraint studentGroupSubjectVariety(ConstraintFactory constraintFactory) {
        // A student group dislikes sequential lessons on the same subject.
        return constraintFactory
                .forEach(Lesson.class)
                .join(Lesson.class,
                        Joiners.equal(Lesson::getSubject),
                        Joiners.equal(Lesson::getStudentGroup),
                        Joiners.equal((lesson) -> lesson.getTimeslot().getDayOfWeek()))
                .filter((lesson1, lesson2) -> {
                    Duration between = Duration.between(lesson1.getTimeslot().getEndTime(),
                            lesson2.getTimeslot().getStartTime());
                    return !between.isNegative() && between.compareTo(Duration.ofMinutes(30)) <= 0;
                })
                .penalize(HardSoftScore.ONE_SOFT)
                .asConstraint("Student group subject variety");
    }
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -



hello-world/src/main/java/org/acme/schooltimetabling/solver/TimeTableConstraintProvider.java [87:102]:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    Constraint studentGroupSubjectVariety(ConstraintFactory constraintFactory) {
        // A student group dislikes sequential lessons on the same subject.
        return constraintFactory
                .forEach(Lesson.class)
                .join(Lesson.class,
                        Joiners.equal(Lesson::getSubject),
                        Joiners.equal(Lesson::getStudentGroup),
                        Joiners.equal((lesson) -> lesson.getTimeslot().getDayOfWeek()))
                .filter((lesson1, lesson2) -> {
                    Duration between = Duration.between(lesson1.getTimeslot().getEndTime(),
                            lesson2.getTimeslot().getStartTime());
                    return !between.isNegative() && between.compareTo(Duration.ofMinutes(30)) <= 0;
                })
                .penalize(HardSoftScore.ONE_SOFT)
                .asConstraint("Student group subject variety");
    }
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -