implement session "subsystem"

[Ichthyostega]

there is a dummy placeholder "Steam" or "Session" subsystem. Fill in the existing parts of the session to make the session come up when Lumiera starts...

[Ichthyostega]

(In #518) doesn't block the object references or the first session implementation round. There's a workaround in place for now

[Ichthyostega]

(In #209) if someone wants to work on this: I'd be happy if something happens on this frontier. Please make sure you understand the design I made for this topic and the interplay with the already implemented command frontend. (read: please ask me to clarify any questions). Otherwise we're bound to waste a lot of effort here.

[Ichthyostega]

need to care for this next,
since I need a place actually to open the SessionCommandService

...thus we need a minimal implementation of the "Session subsystem", at least starting and stopping a dedicated thread

[Ichthyostega]

initial draft done

• running state is identical with a running SteamDispatcher loop thread
• subsystem just instructs the SteamDispatcher via the static interface
• the SteamDispatcher loop thread is a PImpl and a ThreadJoinable

Note: opening and closing the session is probably independent from running the "session subsystem".
When the session comes up (life-cycle event), the SteamDispater is activated (i.e. accepts commands)

[Ichthyostega]

TODO identified a locking inconsistency, i.e. problem with subsystem life-cylce problem, leading to deadlock. Need a better way to clean-up the DispatcherLoop after termination of the session loop thread

[Ichthyostega]

Work done -- changing to Meta

A bunch of (somewhat tricky) implementation work was necessary to build the structures backing session access and command processing.
Backbone and public interface is in place now, while the actual command processing and builder runs remain to be filled in.

We may now consider to activate the »session subsystem« as part of the application.

For this reason, I'll change this ticket into a meta task now, to keep track of the elements still missing for a basically functional Session implementation.

[Ichthyostega]

mylyn/context/zip

[Undercover Agent]

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