// Get the syndicated feed using rome
private SyndFeed getFeed(SourcePojo source, String url) {
synchronized (
FeedHarvester
.class) { // (workaround for ROME concurrency issues:
// http://www.jdom.org/pipermail/jdom-interest/2008-December/016252.html)
if (null == url) {
url = source.getUrl();
}
for (int i = 0; i < 2; ++i) { // Will have 2 goes in case of failure
// Check to see if the feed requires authentication
if (source.getAuthentication() != null) // requires auth
{
try {
FeedFetcher feedFetcher =
new HttpClientFeedFetcher(null, authenticateFeed(source.getAuthentication()));
if ((null != source.getRssConfig()) && (null != source.getRssConfig().getUserAgent())) {
feedFetcher.setUserAgent(source.getRssConfig().getUserAgent());
}
return feedFetcher.retrieveFeed(new URL(url));
} catch (Exception e) {
if (1 == i) { // else just try again
if (null == url) { // can only error on primary RSS, makes life simpler
handleRssError(e, source);
}
}
}
} else // does not require auth
{
try {
FeedFetcherCache feedInfoCache = HashMapFeedInfoCache.getInstance();
FeedFetcher feedFetcher = new HttpURLFeedFetcher(feedInfoCache);
if ((null != source.getRssConfig()) && (null != source.getRssConfig().getUserAgent())) {
feedFetcher.setUserAgent(source.getRssConfig().getUserAgent());
}
return feedFetcher.retrieveFeed(new URL(this.cleanUrlStart(url)));
} catch (Exception e) {
if (1 == i) { // else just try again
if (null == url) { // can only error on primary RSS, makes life simpler
handleRssError(e, source);
}
}
}
}
// If still here, must have errored so sleep before trying again
try {
Thread.sleep(10000);
} catch (InterruptedException e) {
}
} // (end get 2 goes)
}
return null;
}
public static void main(String[] args) {
boolean ok = false;
if (args.length == 1) {
try {
URL feedUrl = new URL(args[0]);
FeedFetcherCache feedInfoCache = HashMapFeedInfoCache.getInstance();
FeedFetcher fetcher = new HttpURLFeedFetcher(feedInfoCache);
FetcherEventListenerImpl listener = new FetcherEventListenerImpl();
fetcher.addFetcherEventListener(listener);
System.err.println("Retrieving feed " + feedUrl);
// Retrieve the feed.
// We will get a Feed Polled Event and then a
// Feed Retrieved event (assuming the feed is valid)
SyndFeed feed = fetcher.retrieveFeed(feedUrl);
System.err.println(feedUrl + " retrieved");
System.err.println(
feedUrl
+ " has a title: "
+ feed.getTitle()
+ " and contains "
+ feed.getEntries().size()
+ " entries.");
// We will now retrieve the feed again. If the feed is unmodified
// and the server supports conditional gets, we will get a "Feed
// Unchanged" event after the Feed Polled event
System.err.println("Polling " + feedUrl + " again to test conditional get support.");
SyndFeed feed2 = fetcher.retrieveFeed(feedUrl);
System.err.println(
"If a \"Feed Unchanged\" event fired then the server supports conditional gets.");
ok = true;
} catch (Exception ex) {
System.out.println("ERROR: " + ex.getMessage());
ex.printStackTrace();
}
}
if (!ok) {
System.out.println();
System.out.println("FeedReader reads and prints any RSS/Atom feed type.");
System.out.println("The first parameter must be the URL of the feed to read.");
System.out.println();
}
}