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         private static Map<Category, String[]> getFeeds() {
  52                 Map<Category, String[]> result;
  53
  54                 result = new HashMap<>();
  55
  56                 result.put(Category.TOP,
  57                            new String[] {
  58                                            "http://www.francetvinfo.fr/titres.rss",
  59                                            "http://www.rfi.fr/general/rss",
  60                                            "http://www.cnews.fr/rss/une",
  61                                            "http://www.ladepeche.fr/rss/a-la-une.rss",
  62                                            "https://www.franceinter.fr/rss/a-la-une.xml",
  63                                            "https://www.francebleu.fr/rss/a-la-une.xml",
  64                                            "http://www.bfmtv.com/rss/info/flux-rss/flux-toutes-les-actualites/"
  65                            });
  66
  67                 result.put(Category.SPORT,
  68                                 new String[] { "http://www.france24.com/fr/sports/rss" });
  69
  70                 result.put(Category.FRANCE,
  71                                 new String[] { "http://www.france24.com/fr/france/rss",
  72                                                "http://www.rfi.fr/france/rss"});
  73
  74                 result.put(Category.EUROPE,
  75                                 new String[] { "http://www.france24.com/fr/europe/rss" });
  76
  77                 result.put(Category.MONDE,
  78                            new String[] { "http://www.france24.com/fr/actualites/rss" });
  79
  80
  81                 result.put(Category.ECO,
  82                                 new String[] { "http://www.france24.com/fr/economie/rss",
  83                                                "http://www.rfi.fr/economie/rss" });
  84
  85                 result.put(Category.ESSONNE,
  86                                 new String[] { "http://www.tourisme-essonne.com/rss/actus/",
  87                                                "http://www.ville-palaiseau.fr/rss/actualites.htm" });
  88
  89                 result.put(Category.PEOPLE,
  90                                 new String[] { "http://www.premiere.fr/rss/actu-live",
  91                                                "http://www.purepeople.com/rss/news_t0.xml"
  92                 });
  93
  94                 result.put(Category.TECHNOLOGIE,
  95                                 new String[] { "http://feeds.feedburner.com/lesnumeriques/news",
  96                                                "http://www.zdnet.fr/feeds/rss/actualites/"});
  97
  98                 return result;
  99         }
 100
 101         private void addArticles(Category cat, SyndFeed feed) {
 102                 String thumbnail;
 103                 String desc, link, title, feedTitle, feedImage;
 104                 Date date;
 105                 List<Article> articles;
 106                 boolean exist;
 107
 108                 feedTitle = feed.getTitle().trim();
 109
 110                 if (feed.getImage() != null)
 111                         feedImage = feed.getImage().getUrl();
 112                 else
 113                         feedImage = null;
 114
 115                 LOG.info("addArticles " + cat.getId() + " " + feedTitle + " number of articles: " + feed.getEntries().size());
 116
 117                 for (SyndEntry entry: feed.getEntries()) {
 118                         thumbnail = null;
 119                         for (SyndEnclosure e: entry.getEnclosures()) {
 120                                 if (e.getType().startsWith("image/"))
 121                                         thumbnail = e.getUrl();
 122                                 break;
 123                         }
 124                         if (thumbnail == null)
 125                                 thumbnail = feedImage;
 126
 127                         title = entry.getTitle().trim();
 128
 129                         if (entry.getDescription() != null) {
 130                                 desc = Jsoup.parse(entry.getDescription().getValue()).text();
 131                         } else {
 132                                 desc = null;
 133                                 LOG.severe("No description for " + feedTitle + " - " + title);
 134                         }
 135
 136                         date = entry.getPublishedDate();
 137                         if (date == null)
 138                                 date = entry.getUpdatedDate();
 139                         if (date == null) {
 140                                 LOG.severe("The article " + feedTitle + " - " + title + " does not have a date");
 141                                 continue;
 142                         }
 143
 144                         synchronized(articlesByCategory) {
 145                                 link = entry.getLink().trim();
 146
 147                                 articles = articlesByCategory.get(cat);
 148                                 exist = false;
 149                                 if (articles == null) {
 150                                         articles = new ArrayList<>();
 151                                         articlesByCategory.put(cat, articles);
 152                                 } else {
 153                                         for (Article a: articles)
 154                                                 if (a.link.equals(link)) {
 155                                                         LOG.fine("addArticles " + link + " is already present");
 156                                                         exist = true;
 157                                                 }
 158                                 }
 159
 160                                 if (!exist) {
 161                                         LOG.fine("add " + cat.getId() + " " + feedTitle + " " + title);
 162
 163                                         articles.add(new Article(link, cat, title, desc, thumbnail, date,
 164                                                         feed.getTitle()));
 165
 166                                         Collections.sort(articles, new Comparator<Article>() {
 167                                                 @Override
 168                                                 public int compare(Article o1, Article o2) {
 169                                                         return o2.publicationDate.compareTo(o1.publicationDate);
 170                                                 }
 171
 172                                         });
 173                                 } else {
 174                                         LOG.finest("addArticles already exist: " + title);
 175                                 }
 176                         }
 177                 }
 178
 179                 LOG.info("addArticles done " + cat.getId());
 180         }
 181
 182         private void retrieveArticles(Category cat) throws IllegalArgumentException, MalformedURLException, FeedException, IOException {
 183                 String[] feeds;
 184
 185                 feeds = getFeeds().get(cat);
 186
 187                 if (feeds != null)
 188                         for (String str: feeds)
 189                                 try {
 190                                         addArticles(cat, getSyndFeed(str));
 191                                 } catch (Throwable e) {
 192                                         LOG.log(Level.SEVERE,
 193                                                 "retrieveArticles failure " + cat.getId() + " " + str,
 194                                                 e);
 195                                 }
 196                 else
 197                         LOG.severe("No feed for category " + cat);
 198         }
 199
 200         /**
 201          * Returns a copy.
 202          */
 203         public List<Article> getArticles(Category cat)
 204                         throws IllegalArgumentException, MalformedURLException, FeedException, IOException {
 205                 synchronized (articlesByCategory) {
 206                         return new ArrayList<>(articlesByCategory.get(cat));
 207                 }
 208         }
 209
 210         private class Refresher implements Runnable {
 211                 private final Category category;
 212
 213                 public Refresher(Category category) {
 214                         this.category = category;
 215                 }
 216
 217                 @Override
 218                 public void run() {
 219                         List<Article> articles;
 220
 221                         LOG.info("refresher "+ category.getId());
 222
 223                         try {
 224                                 retrieveArticles(category);
 225
 226                                 synchronized (articlesByCategory) {
 227                                         articles = articlesByCategory.get(category);
 228                                         if (articles != null && articles.size() > 100) {
 229                                                 articlesByCategory.put(category,
 230                                                                        articles.subList(0, 100));
 231
 232                                         }
 233                                         LOG.info("refresher " + category.getId() + " number of articles: " + articles.size());
 234                                 }
 235                         } catch (IllegalArgumentException | FeedException | IOException e) {
 236                                 LOG.log(Level.SEVERE, "refresher failure", e);
 237                         }
 238
 239                         LOG.info("refresher "+ category.getId() + " done");
 240                 }
 241         }
 242 }