import com.lightstreamer.interfaces.data.SmartDataProvider; //导入依赖的package包/类
@Override
public void onUserEnter(User user, String room, Object roomStatusHandle, boolean realTimeEvent) {
    String id = user.getId();
    logger.debug(id + " enters " + room);
    
    HashMap<String, String> update = new HashMap<String, String>();
    update.put(SmartDataProvider.KEY_FIELD, id);
    update.put(SmartDataProvider.COMMAND_FIELD, SmartDataProvider.ADD_COMMAND);
          
    this.listener.smartUpdate(roomStatusHandle, update, !realTimeEvent);
    
    universe.addPlayerToWorld(user,room);
    
}
 

import com.lightstreamer.interfaces.data.SmartDataProvider; //导入依赖的package包/类
@Override
public void onUserExit(User user, String room, Object roomStatusHandle) {
    String id = user.getId();
    logger.debug(id + " exits " + room);
    
    HashMap<String, String> update = new HashMap<String, String>();
    update.put(SmartDataProvider.KEY_FIELD, id);
    update.put(SmartDataProvider.COMMAND_FIELD, SmartDataProvider.DELETE_COMMAND);
    
    this.listener.smartUpdate(roomStatusHandle, update, false);
    
    universe.removePlayerFromWorld(user,room);
}