A straight-forward subscriber implementation written in Java for the PubSubHubBub 0.3 protocol.

This is a simple subscriber implementation written in Java that enables callback registration to feed changes. It internally uses the Apache HttpClient library for client-side requests and Eclipse Jetty as a lightweight internal webserver. For parsing Atom feeds, the ROME library is used.

Subscriber subscriber = new SubscriberImpl("subscriber-host",8888); Subscription subscription = subscriber.subscribe(URI.create("http://feed-host/my-push-enabled-feed.xml")); subscription.setNotificationCallback(new NotificationCallback() {	@Override	public void handle(SyndFeed feed)	{	//TODO: Do something with the feed	} } ); 

• org.apache.httpclient + dependencies
• org.eclipse.jetty + dependencies
• ROME + dependencies

The initial version only supports synchronous verification of subscription requests, asynchronous verification will be added later. The current version only supports Atom feeds.