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OptaPlanner solves planning problems.
This lightweight, embeddable planning engine implements powerful and scalable algorithms
to optimize business resource scheduling and planning.
This module contains the examples which demonstrate how to use it in a normal Java application.
package org.optaplanner.examples.curriculumcourse.persistence;
import static org.optaplanner.examples.common.persistence.AbstractSolutionImporter.getFlooredPossibleSolutionSize;
import java.io.File;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Random;
import java.util.Set;
import java.util.stream.Collectors;
import org.optaplanner.examples.common.app.CommonApp;
import org.optaplanner.examples.common.app.LoggingMain;
import org.optaplanner.examples.common.persistence.generator.StringDataGenerator;
import org.optaplanner.examples.curriculumcourse.app.CurriculumCourseApp;
import org.optaplanner.examples.curriculumcourse.domain.Course;
import org.optaplanner.examples.curriculumcourse.domain.CourseSchedule;
import org.optaplanner.examples.curriculumcourse.domain.Curriculum;
import org.optaplanner.examples.curriculumcourse.domain.Day;
import org.optaplanner.examples.curriculumcourse.domain.Lecture;
import org.optaplanner.examples.curriculumcourse.domain.Period;
import org.optaplanner.examples.curriculumcourse.domain.Room;
import org.optaplanner.examples.curriculumcourse.domain.Teacher;
import org.optaplanner.examples.curriculumcourse.domain.Timeslot;
import org.optaplanner.examples.curriculumcourse.domain.UnavailablePeriodPenalty;
import org.optaplanner.persistence.common.api.domain.solution.SolutionFileIO;
public class CurriculumCourseGenerator extends LoggingMain {
private static final int DAY_LIST_SIZE = 5;
private static final int TIMESLOT_LIST_SIZE = 7;
private static final int PERIOD_LIST_SIZE = DAY_LIST_SIZE * TIMESLOT_LIST_SIZE - TIMESLOT_LIST_SIZE + 4;
public static void main(String[] args) {
CurriculumCourseGenerator generator = new CurriculumCourseGenerator();
generator.writeCourseSchedule(200, 8);
generator.writeCourseSchedule(400, 16);
generator.writeCourseSchedule(800, 32);
}
private final int[] roomCapacityOptions = {
20,
25,
30,
40,
50
};
private final String[] courseCodes = new String[] {
"Math",
"Chemistry",
"Physics",
"Geography",
"Biology",
"History",
"English",
"Spanish",
"French",
"German",
"ICT",
"Economics",
"Psychology",
"Art",
"Music" };
private final StringDataGenerator teacherNameGenerator = StringDataGenerator.buildFullNames();
protected final SolutionFileIO solutionFileIO = new CurriculumCourseSolutionFileIO();
protected final File outputDir = new File(CommonApp.determineDataDir(CurriculumCourseApp.DATA_DIR_NAME), "unsolved");
protected Random random;
private void writeCourseSchedule(int lectureListSize, int curriculumListSize) {
int courseListSize = lectureListSize * 2 / 9 + 1;
int teacherListSize = courseListSize / 3 + 1;
int roomListSize = lectureListSize * 2 / PERIOD_LIST_SIZE;
String fileName = determineFileName(lectureListSize, PERIOD_LIST_SIZE, roomListSize);
File outputFile = new File(outputDir, fileName + ".json");
CourseSchedule schedule = createCourseSchedule(fileName, teacherListSize, curriculumListSize, courseListSize,
lectureListSize, roomListSize);
solutionFileIO.write(schedule, outputFile);
logger.info("Saved: {}", outputFile);
}
private String determineFileName(int lectureListSize, int periodListSize, int roomListSize) {
return lectureListSize + "lectures-" + periodListSize + "periods-" + roomListSize + "rooms";
}
public CourseSchedule createCourseSchedule(String fileName, int teacherListSize, int curriculumListSize, int courseListSize,
int lectureListSize, int roomListSize) {
random = new Random(37);
CourseSchedule schedule = new CourseSchedule(0L);
createDayList(schedule);
createTimeslotList(schedule);
createPeriodList(schedule);
createTeacherList(schedule, teacherListSize);
createCourseList(schedule, courseListSize);
createLectureList(schedule, lectureListSize);
createRoomList(schedule, roomListSize);
createCurriculumList(schedule, curriculumListSize);
createUnavailablePeriodPenaltyList(schedule);
int possibleForOneLectureSize = schedule.getPeriodList().size() * schedule.getRoomList().size();
BigInteger possibleSolutionSize = BigInteger.valueOf(possibleForOneLectureSize).pow(
schedule.getLectureList().size());
logger.info("CourseSchedule {} has {} teachers, {} curricula, {} courses, {} lectures," +
" {} periods, {} rooms and {} unavailable period constraints with a search space of {}.",
fileName,
schedule.getTeacherList().size(),
schedule.getCurriculumList().size(),
schedule.getCourseList().size(),
schedule.getLectureList().size(),
schedule.getPeriodList().size(),
schedule.getRoomList().size(),
schedule.getUnavailablePeriodPenaltyList().size(),
getFlooredPossibleSolutionSize(possibleSolutionSize));
return schedule;
}
private void createDayList(CourseSchedule schedule) {
List dayList = new ArrayList<>(DAY_LIST_SIZE);
for (int i = 0; i < DAY_LIST_SIZE; i++) {
Day day = new Day(i);
day.setPeriodList(new ArrayList<>(TIMESLOT_LIST_SIZE));
dayList.add(day);
}
schedule.setDayList(dayList);
}
private void createTimeslotList(CourseSchedule schedule) {
List timeslotList = new ArrayList<>(TIMESLOT_LIST_SIZE);
for (int i = 0; i < TIMESLOT_LIST_SIZE; i++) {
Timeslot timeslot = new Timeslot(i);
timeslotList.add(timeslot);
}
schedule.setTimeslotList(timeslotList);
}
private void createPeriodList(CourseSchedule schedule) {
List periodList = new ArrayList<>(schedule.getDayList().size() * schedule.getTimeslotList().size());
long periodId = 0L;
for (Day day : schedule.getDayList()) {
for (Timeslot timeslot : schedule.getTimeslotList()) {
if (day.getDayIndex() == 2 && timeslot.getTimeslotIndex() >= 4) {
// No lectures Wednesday afternoon
continue;
}
Period period = new Period(periodId, day, timeslot);
periodId++;
periodList.add(period);
}
}
schedule.setPeriodList(periodList);
}
private void createTeacherList(CourseSchedule schedule, int teacherListSize) {
List teacherList = new ArrayList<>(teacherListSize);
teacherNameGenerator.predictMaximumSizeAndReset(teacherListSize);
for (int i = 0; i < teacherListSize; i++) {
Teacher teacher = new Teacher(i, teacherNameGenerator.generateNextValue());
teacherList.add(teacher);
}
schedule.setTeacherList(teacherList);
}
private void createCourseList(CourseSchedule schedule, int courseListSize) {
List teacherList = schedule.getTeacherList();
List courseList = new ArrayList<>(courseListSize);
Set codeSet = new HashSet<>();
for (int i = 0; i < courseListSize; i++) {
String code = (i < courseCodes.length * 2)
? courseCodes[i % courseCodes.length]
: courseCodes[random.nextInt(courseCodes.length)];
StringDataGenerator codeSuffixGenerator = new StringDataGenerator("")
.addAToZPart(true, 0);
if (courseListSize >= courseCodes.length) {
String codeSuffix = codeSuffixGenerator.generateNextValue();
while (codeSet.contains(code + codeSuffix)) {
codeSuffix = codeSuffixGenerator.generateNextValue();
}
code = code + codeSuffix;
codeSet.add(code);
}
Teacher teacher = (i < teacherList.size() * 2)
? teacherList.get(i % teacherList.size())
: teacherList.get(random.nextInt(teacherList.size()));
Course course = new Course(i, code, teacher, 0, 0, 1);
courseList.add(course);
}
schedule.setCourseList(courseList);
}
private void createLectureList(CourseSchedule schedule, int lectureListSize) {
List courseList = schedule.getCourseList();
List lectureList = new ArrayList<>(lectureListSize);
for (int i = 0; i < lectureListSize; i++) {
Course course = (i < courseList.size() * 2)
? courseList.get(i % courseList.size())
: courseList.get(random.nextInt(courseList.size()));
course.setLectureSize(course.getLectureSize() + 1);
Lecture lecture = new Lecture(i, course, course.getLectureSize(), false);
lectureList.add(lecture);
}
schedule.setLectureList(lectureList);
}
private void createRoomList(CourseSchedule schedule, int roomListSize) {
List roomList = new ArrayList<>(roomListSize);
for (int i = 0; i < roomListSize; i++) {
Room room = new Room(i, "R" + ((i / 50 * 100) + 1 + i),
roomCapacityOptions[random.nextInt(roomCapacityOptions.length)]);
roomList.add(room);
}
schedule.setRoomList(roomList);
}
private void createCurriculumList(CourseSchedule schedule, int curriculumListSize) {
int maximumCapacity = schedule.getRoomList().stream().mapToInt(Room::getCapacity).max().getAsInt();
List courseList = schedule.getCourseList();
List curriculumList = new ArrayList<>(curriculumListSize);
StringDataGenerator codeGenerator = new StringDataGenerator("")
.addAToZPart(true, 0).addAToZPart(false, 1).addAToZPart(false, 1).addAToZPart(false, 1);
codeGenerator.predictMaximumSizeAndReset(curriculumListSize);
for (int i = 0; i < curriculumListSize; i++) {
Curriculum curriculum = new Curriculum(i, "Group " + codeGenerator.generateNextValue());
// The studentSize is more likely to be 15 than 5 or 25
int studentSize = 5 + random.nextInt(10) + random.nextInt(10);
List courseSubList = courseList.stream()
.filter(course -> course.getStudentSize() + studentSize < maximumCapacity)
.collect(Collectors.toList());
Collections.shuffle(courseSubList, random);
int lectureCount = 0;
for (Course course : courseSubList) {
lectureCount += course.getLectureSize();
if (lectureCount > PERIOD_LIST_SIZE) {
break;
}
course.getCurriculumSet().add(curriculum);
course.setStudentSize(course.getStudentSize() + studentSize);
}
curriculumList.add(curriculum);
}
schedule.setCurriculumList(curriculumList);
}
private void createUnavailablePeriodPenaltyList(CourseSchedule schedule) {
List courseList = schedule.getCourseList();
List periodList = schedule.getPeriodList();
List unavailablePeriodPenaltyList = new ArrayList<>(courseList.size());
long penaltyId = 0L;
for (Course course : courseList) {
UnavailablePeriodPenalty penalty =
new UnavailablePeriodPenalty(penaltyId, course, periodList.get(random.nextInt(periodList.size())));
unavailablePeriodPenaltyList.add(penalty);
penaltyId++;
}
schedule.setUnavailablePeriodPenaltyList(unavailablePeriodPenaltyList);
}
}