[Twisted-Python] Life cycle of ApplicationServices

[Itamar Shtull-Trauring]

On Tue, 2005-10-25 at 15:03 +0200, Eric Basley wrote:

> The FIX main application is an engine able to manage many FIX sessions 
> and is controled by web services. A session may act as a TCP server or 
> client. Sessions have starting time and stopping time. For a client 
> session I'm using a protocol.ReconnectingClientFactory. With 
> Twisted-2.0.1 there is no way to stop properly a service and there  is 
> no way to destroy  (factory, protocol, connector, ...) associated to the 
> service.

Services (I assume you're using twisted.application.service here) are
meant typically for "persistent" objects, encapsulating a specific
system's business logic. In some cases this might be a thin wrapper
around factory, but if you are opening many short-lived connections you
probably don't want to encapsulate as a service. For example, a Web
crawler might be a service - you can start and stop it, configure where
it goes; the specific HTTP connections it manages shouldn't be services.