public class PlayerManager {

    private final NetworkAPI plugin;
    private final ConcurrentHashMap<UUID, PlayerData> cache = new ConcurrentHashMap<>();

    public PlayerManager(NetworkAPI plugin) {
        this.plugin = plugin;
    }

    public PlayerData getPlayerData(UUID player) {
        if (player == null) throw new NullPointerException("Parameter player is null !");

        PlayerData data = cache.get(player);
        data.refreshIfNeeded();
        if (data == null) this.plugin.log(Level.WARNING, player + " is not in the cache !");

        return data;
    }

    public PlayerData getPlayerDataByName(String name) {
        for (PlayerData data : cache.values()) {
            if (data.getEffectiveName().equals(name))
                return data;
        }

        return null;
    }

    public void loadPlayer(UUID player) {
        PlayerData playerData = new PlayerData(player, plugin, this);
        cache.put(player, playerData);
    }

    public void unloadPlayer(UUID player) {
        if (!cache.contains(player)) {
            this.plugin.log(Level.WARNING, player + " is not in the cache !");
            return;
        }
        cache.get(player).updateData();
        Bukkit.getScheduler().runTaskLater(this.plugin, () -> cache.remove(player), 2L);
    }

}