id	summary	reporter	owner	description	type	status	priority	milestone	component	resolution	keywords	cc	branch	branch_author	launchpad_bug
5941	facilitate dependency between service state at startService time	teratorn		"It is often desirable to initiate a controlled, asynchronous start-up of a Service, or MultiService collection. E.g. a database may need to be contacted before the Service can be considered ""started"".

To accommodate this, startService() and privilegedStartService() could be documented as returning None, or a Deferred.

Twisted code that consumes Service objects should be enhanced to support the extended interface, and chain the Deferred, or otherwise take an appropriate action to propogate the startup result.

By default, I think MultiService.startService()'s Deferred should errback if any of the child Service objects errback, as consistent with the current case of synchronous startup (and synchronous Python exceptions).

Thoughts?"	enhancement	new	normal		core