解释器模式举例_lua解释器交互模式_动态编译与解释器模式(25)

然后实现具体的天气服务，这里同样用到了单例模式：

//具体主题public enum WeatherService implements IWeatherService{    instance;    private LinkedList<WeatherInfo> weatherInfos = new LinkedList<WeatherInfo>();    private LinkedHashSet<Client> clients = new LinkedHashSet<Client>();    //存放观察者    //添加观察者    @Override    public void addClient(Client client) {        clients.add(client);    }    //删除观察者    @Override    public boolean deleteClient(Client client) {        return clients.remove(client);    }    //通知观察者    @Override    public void notifyClients() {        Iterator<Client> iterator = clients.iterator();        while(iterator.hasNext()){            iterator.next().getWeather(weatherInfos.peekFirst());        }    }    //更新天气    @Override    public void updateWeather(WeatherInfo info) {        if(weatherInfos.size()>0)            if(weatherInfos.peekFirst().equals(info)) return;        weatherInfos.push(info);        if(clients.size()==0) return;        notifyClients();    }}

最后就是具体的客户端（观察者，此处给出两个）：

public class ClientAndroidServer implements Client {    private static String name = "安卓服务";    private WeatherInfo info;    @Override    public void getWeather(WeatherInfo info) {        this.info = info;        dealMsg();    }    private void dealMsg(){        System.out.println(name  "收到最新天气：time="info.getTime()"msg="info.getWeather()"。马上开始推送消息...");    }}

public class ClientIphoneServer implements Client {    private static String name = "苹果服务";    private WeatherInfo info;    @Override    public void getWeather(WeatherInfo info) {        this.info = info;        dealMsg();    }    private void dealMsg(){        System.out.println(name  "收到最新天气：time="info.getTime()"msg="info.getWeather()"。马上开始推送消息...");    }}

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