war/src/main/java/pnews/servlet/ArticleProvider.java

   1 package pnews.servlet;
   2
   3 import java.io.IOException;
   4 import java.net.MalformedURLException;
   5 import java.net.URL;
   6 import java.util.ArrayList;
   7 import java.util.Comparator;
   8 import java.util.Date;
   9 import java.util.HashMap;
  10 import java.util.List;
  11 import java.util.Map;
  12 import java.util.concurrent.Executors;
  13 import java.util.concurrent.ScheduledExecutorService;
  14 import java.util.concurrent.TimeUnit;
  15 import java.util.logging.Level;
  16 import java.util.logging.Logger;
  17
  18 import org.jsoup.Jsoup;
  19
  20 import com.rometools.rome.feed.synd.SyndEnclosure;
  21 import com.rometools.rome.feed.synd.SyndEntry;
  22 import com.rometools.rome.feed.synd.SyndFeed;
  23 import com.rometools.rome.io.FeedException;
  24 import com.rometools.rome.io.SyndFeedInput;
  25 import com.rometools.rome.io.XmlReader;
  26
  27 import pnews.Article;
  28 import pnews.Category;
  29
  30 public class ArticleProvider {
  31         public final static ArticleProvider singleton = new ArticleProvider();
  32         private static final Logger LOG = Logger.getLogger(ArticleProvider.class.getName());
  33         private final Map<Category, List<Article>> articlesByCategory = new HashMap<>();
  34         private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(2);
  35
  36         private ArticleProvider() {
  37                 for (Category cat:Category.values())
  38                         scheduler.scheduleAtFixedRate(new Refresher(cat), 2, 120, TimeUnit.SECONDS);
  39         }
  40
  41         private static SyndFeed getSyndFeed(String u) throws IllegalArgumentException, FeedException, MalformedURLException, IOException {
  42                 try (XmlReader reader = new XmlReader(new URL(u))) {
  43                         return new SyndFeedInput().build(reader);
  44                 }
  45         }
  46
  47         private static Map<Category, String[]> getFeeds() {
  48                 Map<Category, String[]> result;
  49
  50                 result = new HashMap<>();
  51
  52                 result.put(Category.TOP,
  53                            new String[] {
  54                                            "http://www.francetvinfo.fr/titres.rss",
  55                                            "http://www.france24.com/fr/actualites/rss",
  56                                            //"https://www.franceinter.fr/rss/a-la-une.xml",
  57                                            "http://www.rfi.fr/general/rss",
  58                                            "http://www.cnews.fr/rss/une",
  59                                            "http://www.bfmtv.com/rss/info/flux-rss/flux-toutes-les-actualites/"
  60                            });
  61
  62                 result.put(Category.SPORT,
  63                                 new String[] { "http://www.france24.com/fr/sports/rss" });
  64
  65                 result.put(Category.FRANCE,
  66                                 new String[] { "http://www.france24.com/fr/france/rss",
  67                                                "http://www.rfi.fr/france/rss"});
  68
  69                 result.put(Category.EUROPE,
  70                                 new String[] { "http://www.france24.com/fr/europe/rss" });
  71
  72                 result.put(Category.ECO,
  73                                 new String[] { "http://www.france24.com/fr/economie/rss",
  74                                                "http://www.rfi.fr/economie/rss" });
  75
  76                 result.put(Category.ESSONNE,
  77                                 new String[] { /*"https://www.essonneinfo.fr/feed/"*/ });
  78
  79                 result.put(Category.TECHNOLOGIE,
  80                                 new String[] { "http://feeds.feedburner.com/lesnumeriques/news",
  81                                                "http://www.zdnet.fr/feeds/rss/actualites/"});
  82
  83                 return result;
  84         }
  85
  86         private void addArticles(Category cat, SyndFeed feed) {
  87                 String thumbnail;
  88                 String desc;
  89                 Date date;
  90                 List<Article> articles;
  91
  92                 LOG.info("addArticles" + cat.getId());
  93
  94                 for (SyndEntry entry: feed.getEntries()) {
  95                         thumbnail = null;
  96                         for (SyndEnclosure e: entry.getEnclosures()) {
  97                                 if (e.getType().startsWith("image/"))
  98                                         thumbnail = e.getUrl();
  99                                 break;
 100                         }
 101
 102                         if (entry.getDescription() != null) {
 103                                 desc = Jsoup.parse(entry.getDescription().getValue()).text();
 104                         } else {
 105                                 desc = null;
 106                                 LOG.severe("No description for " + feed.getTitle() + " - " + entry.getTitle());
 107                         }
 108
 109                         date = entry.getPublishedDate();
 110                         if (date == null)
 111                                 date = entry.getUpdatedDate();
 112
 113                         synchronized(articlesByCategory) {
 114                                 articles = articlesByCategory.get(cat);
 115                                 if (articles == null) {
 116                                         articles = new ArrayList<>();
 117                                         articlesByCategory.put(cat, articles);
 118                                 } else {
 119                                         for (Article a: articles)
 120                                                 if (a.link.equals(entry.getLink()))
 121                                                         return ;
 122                                 }
 123
 124                                 articles.add(new Article(entry.getLink(),
 125                                                          cat,
 126                                                          entry.getTitle(),
 127                                                          desc,
 128                                                          thumbnail,
 129                                                          date,
 130                                                          feed.getTitle()));
 131
 132                                 articles.sort(new Comparator<Article>() {
 133                                         @Override
 134                                         public int compare(Article o1, Article o2) {
 135                                                 return o2.publicationDate.compareTo(o1.publicationDate);
 136                                         }
 137
 138                                 });
 139                         }
 140                 }
 141         }
 142
 143         private void retrieveArticles(Category cat) throws IllegalArgumentException, MalformedURLException, FeedException, IOException {
 144                 String[] feeds;
 145
 146                 feeds = getFeeds().get(cat);
 147
 148                 if (feeds != null)
 149                         for (String str: feeds)
 150                                 addArticles(cat, getSyndFeed(str));
 151                 else
 152                         LOG.severe("No feed for category " + cat);
 153         }
 154
 155         public List<Article> getArticles(Category cat)
 156                         throws IllegalArgumentException, MalformedURLException, FeedException, IOException {
 157                 synchronized (articlesByCategory) {
 158                         return articlesByCategory.get(cat);
 159                 }
 160         }
 161
 162         private class Refresher implements Runnable {
 163                 private final Category category;
 164
 165                 public Refresher(Category category) {
 166                         this.category = category;
 167                 }
 168
 169                 @Override
 170                 public void run() {
 171                         List<Article> articles;
 172
 173                         LOG.info("refresher "+ category.getId());
 174
 175                         try {
 176                                 retrieveArticles(category);
 177
 178                                 synchronized (articlesByCategory) {
 179                                         articles = articlesByCategory.get(category);
 180                                         if (articles != null && articles.size() > 100) {
 181                                                 articlesByCategory.put(category,
 182                                                                        articles.subList(0, 100));
 183
 184                                         }
 185                                 }
 186                         } catch (IllegalArgumentException | FeedException | IOException e) {
 187                                 LOG.log(Level.SEVERE, "refresher failure", e);
 188                         }
 189
 190                         LOG.info("refresher "+ category.getId() + " done");
 191                 }
 192         }
 193 }