Question

我想出了一种将该随机用户改组为其他用户的算法。（用于秘密圣诞老人游戏）但是当我在给定的时间启动用于改组的异步过程时，它会被第5个用户停止。有什么想法吗？

我对算法的服务并启动它：

public class GitfteeServiceImpl implements GifteeService{
@Autowired
private  UserRepository userRepository;

private final ScheduledExecutorService shufflingScheduler = Executors.newSingleThreadScheduledExecutor();

@Override
public void setGifteeToAll() {
    List<User> users = userRepository.findAll();
    List<User> usersGiftees = userRepository.findAll();
    List<Long> userIds = usersGiftees.stream().map(User::getUserId).collect(Collectors.toList());
    log.info(users.toString());
    for(User u : users){
        User giftee = getGifteeForOne(u, usersGiftees,userIds);
        userIds.remove(giftee.getUserId());
        usersGiftees.remove(giftee);
    }
}

private User getGifteeForOne(User user, List<User> users, List<Long> ids) {
    Long randomId = getRandomId(ids);
    User giftee = userRepository.findByUserId(randomId);

    while (giftee == null || !users.contains(giftee) || Objects.equals(user.getUserId(), randomId)){
        randomId = getRandomId(ids);
        giftee = userRepository.findByUserId(randomId);
    }

    user.setGiftee(giftee);
    userRepository.save(user);
    return giftee;
}

private Long getRandomId(List<Long> ids) {
    Collections.shuffle(ids);
    return ids.get(0);
}

@Override
public void scheduleShuffling(LocalDateTime gameDuration) {
    Runnable scheduleShufflingTask = this::setGifteeToAll;
    Duration duration = Duration.between(LocalDateTime.now(), gameDuration);
    shufflingScheduler.schedule(scheduleShufflingTask, duration.getSeconds(), TimeUnit.SECONDS);
}

}

这是我的控制者：

public class AdminController {

@Autowired
GifteeService gifteeService;

@PostMapping("/start_date")
public void hi(@RequestBody LocalDateTime localDateTime) {
    LocalDateTime aDateTime = LocalDateTime.of(2019, Month.JANUARY, 17, 22, 39, 50);
    gifteeService.scheduleShuffling(aDateTime);

}

Answer 1

因此，在进行深度调试之后，我发现我的算法实际上是不正确的，并且被调度程序杀死是正常的。这是我所做的更改：

private User getGifteeForOne(User user, List<User> users, List<Long> ids) {
Long randomId = getRandomId(ids);
User giftee = userRepository.findByUserId(randomId);

//The line that was incorrect
while (giftee == null || users.contains(giftee) || Objects.equals(user.getUserId(), randomId)){
    randomId = getRandomId(ids);
    giftee = userRepository.findByUserId(randomId);
}

user.setGiftee(giftee);
userRepository.save(user);
return giftee;
}

为什么调度程序会杀死我的改组算法？

1 个答案: