| package net.sf.taverna.t2.activities.interaction; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.util.Date; |
| |
| import net.sf.taverna.t2.activities.interaction.preference.InteractionPreference; |
| |
| import org.apache.abdera.model.Document; |
| import org.apache.abdera.model.Entry; |
| import org.apache.abdera.model.Feed; |
| import org.apache.abdera.parser.ParseException; |
| import org.apache.abdera.parser.Parser; |
| import org.apache.abdera.parser.stax.FOMParser; |
| import org.apache.log4j.Logger; |
| |
| public abstract class FeedReader extends Thread { |
| |
| static final Logger logger = Logger.getLogger(FeedReader.class); |
| |
| public FeedReader(final String name) { |
| super(name); |
| this.setDaemon(true); |
| } |
| |
| protected abstract void considerEntry(Entry entry); |
| |
| @Override |
| public void run() { |
| try { |
| final Parser parser = new FOMParser(); |
| Date lastCheckedDate = new Date(); |
| while (true) { |
| try { |
| sleep(5000); |
| } catch (final InterruptedException e1) { |
| logger.error(e1); |
| } |
| InputStream openStream = null; |
| try { |
| final Date newLastCheckedDate = new Date(); |
| final URL url = getInteractionPreference().getFeedUrl(); |
| openStream = url.openStream(); |
| final Document<Feed> doc = parser.parse(openStream, |
| url.toString()); |
| final Feed feed = doc.getRoot().sortEntriesByEdited(true); |
| |
| for (final Entry entry : feed.getEntries()) { |
| |
| Date d = entry.getEdited(); |
| if (d == null) { |
| d = entry.getUpdated(); |
| } |
| if (d == null) { |
| d = entry.getPublished(); |
| } |
| if (d.before(lastCheckedDate)) { |
| break; |
| } |
| this.considerEntry(entry); |
| } |
| lastCheckedDate = newLastCheckedDate; |
| } catch (final MalformedURLException e) { |
| logger.error(e); |
| } catch (final ParseException e) { |
| logger.error(e); |
| } catch (final IOException e) { |
| logger.error(e); |
| } finally { |
| try { |
| if (openStream != null) { |
| openStream.close(); |
| } |
| } catch (final IOException e) { |
| logger.error(e); |
| } |
| } |
| } |
| } catch (final Exception e) { |
| logger.error(e); |
| } |
| } |
| |
| protected abstract InteractionPreference getInteractionPreference(); |
| } |