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Updating notes

This commit is contained in:
Ben Davies 2014-10-04 12:50:04 +01:00
parent b6de09f2a3
commit 99b882aad2
1 changed files with 1 additions and 39 deletions
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notes.md
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@ -45,42 +45,4 @@ The developer will then b provided with two powerful options:
This opens up exciting possibilities for developers and the future of the go-pkg-rss package. We could add handlers for caching via memcache, a retry count handler for channels, a whitelist/blacklist handler based on item title, a filter handler that strips out items that have a date older than 3 hours, etc.
type ChannelHandler interface {
func ProcessChannels(f *Feed, newchannels []*Channel)
}
type ItemHandler interface {
func ProcessItems(f *Feed, ch *Channel, newitems []*Item)
}
type ItemCache struct {
mc *memcache.Conn
}
func (ic *ItemCache) ProcessItems(ih rss.ItemHandler) rss.ItemHandler {
return func(f *Feed, ch *Channel, newitems []*Item) {
for _, v := range newitems {
_ := ic.mc.Add(v)
}
ih(f, ch, newitems)
}
}
func (this *Feed) notifyListeners() {
var newchannels []*Channel
for _, channel := range this.Channels {
if this.database.request <- channel.Key(); !<-this.database.response {
newchannels = append(newchannels, channel)
}
var newitems []*Item
for _, item := range channel.Items {
if this.database.request <- item.Key(); !<-this.database.response {
newitems = append(newitems, item)
}
}
if len(newitems) > 0 && this.itemhandler != nil {
this.itemhandler(this, channel, newitems)
}
}
if len(newchannels) > 0 && this.chanhandler != nil {
this.chanhandler(this, newchannels)
}
}
Whats nice about this approach is that we can recreate a functionally identical approach that means this is backwards compatible with older code that implements the old way of dealing with handlers and duplicate channels and items.