Refactored the handler functions into interface types. Follows the /net/http handlers pattern. Handlers are now chainable. Moved database checking from notifyHandlers. Implemented database feature as chainable handler

testdata/handlers/handlerexample.go

@@ -0,0 +1,59 @@
+package main
+
+/*
+This is a minimal sample application, demonstrating how to set up an RSS feed
+for regular polling of new channels/items.
+
+Build & run with:
+
+ $ 6g example.go && 6l example.6 && ./6.out
+
+*/
+
+import (
+	"fmt"
+	rss "github.com/JalfResi/go-pkg-rss"
+	"os"
+	"time"
+)
+
+func main() {
+	// This sets up a new feed and polls it for new channels/items.
+	// Invoke it with 'go PollFeed(...)' to have the polling performed in a
+	// separate goroutine, so you can continue with the rest of your program.
+	PollFeed("http://blog.case.edu/news/feed.atom", 5)
+}
+
+func PollFeed(uri string, timeout int) {
+
+	feed := rss.NewWithHandler(timeout, true, rss.NewDatabaseHandler(NewMyHandler()))
+
+	for {
+		if err := feed.Fetch(uri, nil); err != nil {
+			fmt.Fprintf(os.Stderr, "[e] %s: %s", uri, err)
+			return
+		}
+
+		<-time.After(time.Duration(10 * time.Second))
+	}
+}
+
+/*
+func itemHandler(feed *rss.Feed, ch *rss.Channel, newitems []*rss.Item) {
+	fmt.Printf("%d new item(s) in %s\n", len(newitems), feed.Url)
+}
+*/
+
+type MyHandler struct{}
+
+func NewMyHandler() rss.Handler {
+	return &MyHandler{}
+}
+
+func (m *MyHandler) ProcessChannels(feed *rss.Feed, newchannels []*rss.Channel) {
+	fmt.Printf("%d new channel(s) in %s\n", len(newchannels), feed.Url)
+}
+
+func (m *MyHandler) ProcessItems(feed *rss.Feed, ch *rss.Channel, newitems []*rss.Item) {
+	fmt.Printf("%d new rad item(s) in %s\n", len(newitems), feed.Url)
+}