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Service Design Pattern
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package com.moommimit.moommim.controller; | |
import com.moommimit.moommim.service.NewsService; | |
import com.moommimit.moommim.utils.ResultCallback; | |
import java.io.IOException; | |
import java.util.logging.Logger; | |
import javax.inject.Inject; | |
import javax.servlet.ServletException; | |
import javax.servlet.annotation.WebServlet; | |
import javax.servlet.http.HttpServlet; | |
import javax.servlet.http.HttpServletRequest; | |
import javax.servlet.http.HttpServletResponse; | |
@WebServlet(name = "HomeServlet", urlPatterns = {"/cat/*"}) | |
public class HomeServlet extends HttpServlet { | |
private static final Logger LOGGER = Logger.getLogger(HomeServlet.class.getSimpleName()); | |
@Inject | |
private NewsService newsService; | |
@Override | |
protected void doGet(HttpServletRequest request, HttpServletResponse response) | |
throws ServletException, IOException { | |
System.out.println("Home Serv"); | |
String name = request.getParameter("name"); | |
newsService.getNews(name, new ResultCallback<String[]>() { | |
@Override | |
public void onSuccess(String[] news) { | |
for (String item : news) { | |
System.out.println("News: " + item); | |
} | |
} | |
@Override | |
public void onError(Exception ex) { | |
System.out.println("Is have Error"); | |
} | |
}); | |
} | |
@Override | |
protected void doPost(HttpServletRequest request, HttpServletResponse response) | |
throws ServletException, IOException { | |
} | |
} |
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package com.moommimit.moommim.service; | |
import com.moommimit.moommim.utils.ResultCallback; | |
public interface NewsService { | |
void getNews(String name, ResultCallback newsCallback); | |
} |
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package com.moommimit.moommim.service; | |
import com.moommimit.moommim.utils.ResultCallback; | |
import javax.enterprise.context.ApplicationScoped; | |
@ApplicationScoped | |
public class NewsServiceImpl implements NewsService { | |
@Override | |
public void getNews(String name, ResultCallback newsCallback) { | |
boolean isHaveNews = true; | |
System.out.println("Hello " + name); | |
if (isHaveNews) { | |
String[] news = {"Tech", "Drama", "Movie"}; | |
newsCallback.onSuccess(news); | |
} else { | |
newsCallback.onError(null); | |
} | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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package com.moommimit.moommim.utils; | |
public interface ResultCallback<T> { | |
void onSuccess(T result); | |
void onError(Exception ex); | |
} |
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