Introduction
This is the fifth part of the Twisted tutorial Twisted from Scratch, or The Evolution of Finger .
In this part we will add new several new backends to our finger service using the component-based architecture developed in The Evolution of Finger: moving to a component based architecture . This will show just how convenient it is to implement new back-ends when we move to a component based architecture. Note that here we also use an interface we previously wrote, FingerSetterFactory , by supporting one single method. We manage to preserve the service's ignorance of the network.
Another Back-end
finger19b_changes.py <listings/finger/finger19b_changes.py>
Full source code here:
finger19b.tac <listings/finger/finger19b.tac>
We've already written this, but now we get more for less work: the network code is completely separate from the back-end.
Yet Another Back-end: Doing the Standard Thing
finger19c_changes.py <listings/finger/finger19c_changes.py>
Full source code here:
finger19c.tac <listings/finger/finger19c.tac>
Not much to say except that now we can be churn out backends like crazy. Feel like doing a back-end for Advogato , for example? Dig out the XML-RPC client support Twisted has, and get to work!