var rssLinks = ["http://host1/rss.xml", "http://host2/rss.xml", "http://host3/rss.xml"];

// My Task
var task = Rx.Observable.from(rssLinks)
.flatMap(functions.fetchFeeds);

task.subscribe(function(feed) {
    console.log("nFeed " + feed.title + ", " + feed.link);
});

var disposable = Rx.Scheduler.timeout.schedulePeriodic(
 60000, /* 1 minute */
 function () {
      // Execute My Task...
 });