package com.google.code.rsser.service;import java.util.List;import com.google.code.rsser.exception.InvalidFeedException;import com.google.code.rsser.model.Feed;import com.google.code.rsser.model.User;public interface FeedService {	Feed subscribe(User user, String url) throws InvalidFeedException;	boolean isFeedSubscribed(User user, String url);		void updateAll();	List<Feed> findSubscribed(User user);	Feed get(Integer id);}