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package net.sf.flock.support;
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import java.net.URL;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Iterator;
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import java.util.List;
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import net.sf.flock.FeedFactoryI;
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import net.sf.flock.FeedI;
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import net.sf.flock.FeedInfoI;
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import net.sf.flock.FlockResourceException;
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import net.sf.flock.MetaData;
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import net.sf.flock.SubscriptionI;
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import net.sf.flock.SubscriptionInfoI;
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import net.sf.flock.SubscriptionManagerI;
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import net.sf.flock.parser.FeedLoader;
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import net.sf.flock.parser.UnsupportedFeedFormatException;
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import net.sf.flock.util.DocumentLoader;
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import org.apache.log4j.LogManager;
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import org.apache.log4j.Logger;
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import org.jdom.Document;
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public abstract class AbstractSubscriptionManager implements SubscriptionManagerI {
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private final static Logger LOGGER = LogManager.getLogger(AbstractSubscriptionManager.class);
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public SubscriptionI[] subscribe(final URL location, final MetaData metaData) throws FlockResourceException {
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return this.subscribe(new SubscriptionInfoI() {
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public URL getLocation() {
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return location;
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}
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public MetaData getMetaData() {
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return metaData;
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}
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public FeedInfoI getFeedInfo() {
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return new FeedInfoI() {
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public String getTitle() {
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return "New feed";
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}
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public URL getSite() {
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return null;
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}
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public SubscriptionInfoI getSubscriptionInfo() {
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return null;
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}
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};
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}
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}, true);
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}
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protected abstract SubscriptionI createSubscription(SubscriptionInfoI subscriptionInfo) throws FlockResourceException;
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/**
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* @return List of new ItemI objects
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*/
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protected List refresh(SubscriptionI subscription) throws FlockResourceException {
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FeedLoader factory = new FeedLoader(this.getFeedFactory());
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Document doc = new DocumentLoader().loadDocument(subscription.getLocation());
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FeedI feed = factory.parseFeed(subscription, doc);
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return subscription.getFeed().merge( feed );
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}
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protected abstract FeedFactoryI getFeedFactory();
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public SubscriptionI[] subscribe(SubscriptionInfoI si, boolean loadFeed) throws FlockResourceException {
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Document doc = new DocumentLoader().loadDocument(si.getLocation());
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try {
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SubscriptionI subscription = this.createSubscription(si);
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if (loadFeed) {
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this.refresh(subscription);
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}
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return new SubscriptionI[] { subscription };
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} catch (UnsupportedFeedFormatException e) {
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LOGGER.info("Unknown feed format, trying OPML...");
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OpmlSubscriptionImport importer = new OpmlSubscriptionImport( si.getMetaData() );
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if (!importer.isSuitable(doc)) {
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throw new FlockResourceException("Unsupported feed format");
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}
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LOGGER.info("Parsing as OPML");
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SubscriptionInfoI[] subInfos = importer.load(doc);
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List subs = new ArrayList(subInfos.length);
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for (int i=0; i<subInfos.length; i++) {
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try {
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subs.addAll( Arrays.asList(
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this.subscribe(subInfos[i], false)
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) );
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} catch (FlockResourceException ex) {
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LOGGER.warn("Unable to subscribe to "+subInfos[i].getLocation(), ex);
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}
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}
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return (SubscriptionI[])subs.toArray( new SubscriptionI[subs.size()] );
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}
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}
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boolean alreadyRunningRefreshThread = false;
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/**
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* TODO: implement proper balking
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*/
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public boolean refreshAll() {
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synchronized(this) {
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if (alreadyRunningRefreshThread)
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return false;
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alreadyRunningRefreshThread = true;
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}
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Thread t = new Thread("FlockAsyncRefresh") {
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public void run() {
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try {
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doRefreshAll();
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} catch (FlockResourceException e) {
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LOGGER.warn("Problem in refreshAll", e);
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} finally {
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alreadyRunningRefreshThread = false;
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}
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}
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};
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t.start();
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return true;
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}
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protected void doRefreshAll() throws FlockResourceException {
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for (Iterator i=this.getSubscriptionInfos().iterator(); i.hasNext(); ) {
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SubscriptionInfoI si = (SubscriptionInfoI) i.next();
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SubscriptionI subscription = this.getSubscription( si.getLocation() );
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try {
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refresh( subscription );
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} catch (FlockResourceException e) {
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LOGGER.warn("Failed to refresh feed["+subscription.getLocation()+"], skipping", e);
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}
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}
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150
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}
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151
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152
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153
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}
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154
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