SimManager.java

package net.sf.l2j.gameserver.custom.damagesim;

import net.sf.l2j.gameserver.model.actor.instance.Player;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

public class SimManager {
    private final Map<Integer, DmgSim> _simList = new ConcurrentHashMap<>();
    public static SimManager getInstance()
    {
        return SimManager.SingletonHolder._instance;
    }


    public DmgSim getSim(int plrObjId)
    {
        return _simList.get(plrObjId);
    }

    public void addNewSim(Player player, DmgSim page, int plrObjId)
    {
        if (player == null)
            return;

        _simList.put(plrObjId, page);
    }

    private static class SingletonHolder
    {
        protected static final SimManager _instance = new SimManager();
    }
}