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.Collections;
   8 import java.util.Comparator;
   9 import java.util.Date;
  10 import java.util.HashMap;
  11 import java.util.List;
  12 import java.util.Map;
  13 import java.util.concurrent.Executors;
  14 import java.util.concurrent.ScheduledExecutorService;
  15 import java.util.concurrent.TimeUnit;
  16 import java.util.logging.Level;
  17 import java.util.logging.Logger;
  18
  19 import org.jsoup.Jsoup;
  20
  21 import com.rometools.rome.feed.synd.SyndEnclosure;
  22 import com.rometools.rome.feed.synd.SyndEntry;
  23 import com.rometools.rome.feed.synd.SyndFeed;
  24 import com.rometools.rome.io.FeedException;
  25 import com.rometools.rome.io.SyndFeedInput;
  26 import com.rometools.rome.io.XmlReader;
  27
  28 import pnews.Article;
  29 import pnews.Category;
  30
  31 public class ArticleProvider {
  32         public final static ArticleProvider singleton = new ArticleProvider();
  33         private static final Logger LOG = Logger.getLogger(ArticleProvider.class.getName());
  34         private final Map<Category, List<Article>> articlesByCategory = new HashMap<>();
  35         private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(2);
  36
  37         private ArticleProvider() {
  38                 for (Category cat:Category.values())
  39                         scheduler.scheduleAtFixedRate(new Refresher(cat), 2, 600, TimeUnit.SECONDS);
  40         }
  41
  42         private static SyndFeed getSyndFeed(String u) throws IllegalArgumentException, FeedException, MalformedURLException, IOException {
  43                 XmlReader r;
  44
  45                 r = new XmlReader(new URL(u));
  46                 XmlReader.setDefaultEncoding("UTF-8");
  47
  48                 return new SyndFeedInput().build(r);
  49
  50         }
  51
  52         private static Map<Category, String[]> getFeeds() {
  53                 Map<Category, String[]> result;
  54
  55                 result = new HashMap<>();
  56
  57                 result.put(Category.TOP,
  58                            new String[] {
  59                                            "http://www.francetvinfo.fr/titres.rss",
  60                                            "http://www.rfi.fr/general/rss",
  61                                            "http://www.cnews.fr/rss/une",
  62                                            "http://www.ladepeche.fr/rss/a-la-une.rss",
  63                                            "https://www.franceinter.fr/rss/a-la-une.xml",
  64                                            "https://www.francebleu.fr/rss/a-la-une.xml",
  65                                            "http://www.bfmtv.com/rss/info/flux-rss/flux-toutes-les-actualites/"
  66                            });
  67
  68                 result.put(Category.SPORT,
  69                                 new String[] { "http://www.france24.com/fr/sports/rss" });
  70
  71                 result.put(Category.FRANCE,
  72                                 new String[] { "http://www.france24.com/fr/france/rss",
  73                                                "http://www.rfi.fr/france/rss"});
  74
  75                 result.put(Category.EUROPE,
  76                                 new String[] { "http://www.france24.com/fr/europe/rss" });
  77
  78                 result.put(Category.MONDE,
  79                            new String[] { "http://www.france24.com/fr/actualites/rss" });
  80
  81
  82                 result.put(Category.ECO,
  83                                 new String[] { "http://www.france24.com/fr/economie/rss",
  84                                                "http://www.rfi.fr/economie/rss" });
  85
  86                 result.put(Category.ESSONNE,
  87                                 new String[] { "http://www.tourisme-essonne.com/rss/actus/",
  88                                                "http://www.ville-palaiseau.fr/rss/actualites.htm" });
  89
  90                 result.put(Category.PEOPLE,
  91                                 new String[] { "http://www.premiere.fr/rss/actu-live",
  92                                                "http://www.purepeople.com/rss/news_t0.xml"
  93                 });
  94
  95                 result.put(Category.TECHNOLOGIE,
  96                                 new String[] { "http://feeds.feedburner.com/lesnumeriques/news",
  97                                                "http://www.zdnet.fr/feeds/rss/actualites/"});
  98
  99                 return result;
 100         }
 101
 102         private void addArticles(Category cat, SyndFeed feed) {
 103                 String thumbnail;
 104                 String desc, link, title, feedTitle, feedImage;
 105                 Date date;
 106                 List<Article> articles;
 107                 boolean exist;
 108
 109                 feedTitle = feed.getTitle().trim();
 110
 111                 if (feed.getImage() != null)
 112                         feedImage = feed.getImage().getUrl();
 113                 else
 114                         feedImage = null;
 115
 116                 LOG.info("addArticles " + cat.getId() + " " + feedTitle + " number of articles: " + feed.getEntries().size());
 117
 118                 for (SyndEntry entry: feed.getEntries()) {
 119                         thumbnail = null;
 120                         for (SyndEnclosure e: entry.getEnclosures()) {
 121                                 if (e.getType().startsWith("image/"))
 122                                         thumbnail = e.getUrl();
 123                                 break;
 124                         }
 125                         if (thumbnail == null)
 126                                 thumbnail = feedImage;
 127
 128                         title = entry.getTitle().trim();
 129
 130                         if (entry.getDescription() != null) {
 131                                 desc = Jsoup.parse(entry.getDescription().getValue()).text();
 132                         } else {
 133                                 desc = null;
 134                                 LOG.severe("No description for " + feedTitle + " - " + title);
 135                         }
 136
 137                         date = entry.getPublishedDate();
 138                         if (date == null)
 139                                 date = entry.getUpdatedDate();
 140                         if (date == null) {
 141                                 LOG.severe("The article " + feedTitle + " - " + title + " does not have a date");
 142                                 continue;
 143                         }
 144
 145                         synchronized(articlesByCategory) {
 146                                 link = entry.getLink().trim();
 147
 148                                 articles = articlesByCategory.get(cat);
 149                                 exist = false;
 150                                 if (articles == null) {
 151                                         articles = new ArrayList<>();
 152                                         articlesByCategory.put(cat, articles);
 153                                 } else {
 154                                         for (Article a: articles)
 155                                                 if (a.link.equals(link)) {
 156                                                         LOG.fine("addArticles " + link + " is already present");
 157                                                         exist = true;
 158                                                 }
 159                                 }
 160
 161                                 if (!exist) {
 162                                         LOG.fine("add " + cat.getId() + " " + feedTitle + " " + title);
 163
 164                                         articles.add(new Article(link, cat, title, desc, thumbnail, date,
 165                                                         feed.getTitle()));
 166
 167                                         Collections.sort(articles, new Comparator<Article>() {
 168                                                 @Override
 169                                                 public int compare(Article o1, Article o2) {
 170                                                         return o2.publicationDate.compareTo(o1.publicationDate);
 171                                                 }
 172
 173                                         });
 174                                 } else {
 175                                         LOG.finest("addArticles already exist: " + title);
 176                                 }
 177                         }
 178                 }
 179
 180                 LOG.info("addArticles done " + cat.getId());
 181         }
 182
 183         private void retrieveArticles(Category cat) throws IllegalArgumentException, MalformedURLException, FeedException, IOException {
 184                 String[] feeds;
 185
 186                 feeds = getFeeds().get(cat);
 187
 188                 if (feeds != null)
 189                         for (String str: feeds)
 190                                 try {
 191                                         addArticles(cat, getSyndFeed(str));
 192                                 } catch (Throwable e) {
 193                                         LOG.log(Level.SEVERE,
 194                                                 "retrieveArticles failure " + cat.getId() + " " + str,
 195                                                 e);
 196                                 }
 197                 else
 198                         LOG.severe("No feed for category " + cat);
 199         }
 200
 201         public List<Article> getArticles(Category cat)
 202                         throws IllegalArgumentException, MalformedURLException, FeedException, IOException {
 203                 synchronized (articlesByCategory) {
 204                         return articlesByCategory.get(cat);
 205                 }
 206         }
 207
 208         private class Refresher implements Runnable {
 209                 private final Category category;
 210
 211                 public Refresher(Category category) {
 212                         this.category = category;
 213                 }
 214
 215                 @Override
 216                 public void run() {
 217                         List<Article> articles;
 218
 219                         LOG.info("refresher "+ category.getId());
 220
 221                         try {
 222                                 retrieveArticles(category);
 223
 224                                 synchronized (articlesByCategory) {
 225                                         articles = articlesByCategory.get(category);
 226                                         if (articles != null && articles.size() > 100) {
 227                                                 articlesByCategory.put(category,
 228                                                                        articles.subList(0, 100));
 229
 230                                         }
 231                                         LOG.info("refresher " + category.getId() + " number of articles: " + articles.size());
 232                                 }
 233                         } catch (IllegalArgumentException | FeedException | IOException e) {
 234                                 LOG.log(Level.SEVERE, "refresher failure", e);
 235                         }
 236
 237                         LOG.info("refresher "+ category.getId() + " done");
 238                 }
 239         }
 240 }