/* * To change this template, choose Tools | Templates * and open the template in the editor. */package chat.server;import chat.common.LoginMessage;import chat.common.LogoutMessage;import chat.common.Message;import chat.common.User;import java.util.Collection;/** * * @author Administrator */public interface ServerModel {    void doLogin(LoginMessage message);    void doLogout(LogoutMessage message);    void addUserToList(User user,ServWorker worker);    void removeUserFromList(User user);    void sendMessageToUser(User user,Message message);    void sendMessageToUsers(Message message);    void sendMessageToUsers(Collection<User> users,Message message);}